INVERTER

INVERTER
A800 Plus

A800 Plus
FR-A840-LC (LIQUID COOLED TYPE)
INSTRUCTION MANUAL (HARDWARE)

High functionality and high performance

FR-A840-03250(110K) to 06830(280K)-LC

FR-A840-LC INSTRUCTION MANUAL (HARDWARE)

INTRODUCTION
1
INSTALLATION AND WIRING
2
PRECAUTIONS FOR USE OF
THE INVERTER 3
PRECAUTIONS FOR
MAINTENANCE AND 4
HEAD OFFICE: TOKYO BUILDING 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
INSPECTION
SPECIFICATIONS
5

IB(NA)-0600683ENG-C(2410)MEE Printed in Japan Specifications subject to change without notice.

Thank you for choosing Mitsubishi Electric inverter.
This Instruction Manual describes handling and cautions about the hardware, such as installation and wiring, for the FR-A840-LC
(liquid cooled type).
Information about the software, such as basic operations and parameters, is described in the Instruction Manual (Detailed) and the
Safety Stop Function Instruction Manual. For details on Ethernet communication, refer to the Ethernet Function Manual. In addition
to this manual, read these instruction manuals carefully to ensure proper use. Do not use this product until you have a full
knowledge of this product mechanism, safety information and instructions.
The manuals can be downloaded in PDF form from the Mitsubishi Electric FA Global Website.
Please forward this Instruction Manual to the end user.
https://www.MitsubishiElectric.com/fa/products/drv/inv/support/a800/a800lc.html


Safety instructions
Do not attempt to install, operate, maintain or inspect this WARNING
product until you have read the Instruction Manuals and
appended documents carefully. Do not use this product until  Do not remove the front cover or the wiring cover while the power
you have a full knowledge of this product mechanism, safety of this product is ON, and do not run this product with the front
information and instructions. cover or the wiring cover removed as the exposed high voltage
Installation, operation, maintenance and inspection must be terminals or the charging part of the circuitry can be touched.
performed by qualified personnel. Here, qualified personnel Otherwise you may get an electric shock.
means a person who meets all the following conditions:  Even if power is OFF, do not remove the front cover except for
• A person who possesses a certification in regard with wiring or periodic inspection as the inside of this product is
electric appliance handling, or person took a proper charged. Otherwise you may get an electric shock.
engineering training. Such training may be available at your  Before wiring or inspection, check that the LED display of the
local Mitsubishi Electric office. Contact your local sales office operation panel is OFF. Any person who is involved in wiring or
for schedules and locations. inspection shall wait for 10 minutes or longer after the power
• A person who can access operating manuals for the supply has been cut off, and check that there are no residual
protective devices (for example, light curtain) connected to voltage using a tester or the like. The capacitor is charged with
the safety control system, or a person who has read these high voltage for some time after power OFF, and it is dangerous.
manuals thoroughly and familiarized themselves with the  This product must be earthed (grounded). Earthing (grounding)
protective devices. must conform to the requirements of national and local safety
regulations and electrical code (NEC section 250, IEC 61140
In this Instruction Manual, the safety instruction levels are class 1 and other applicable standards).
classified into "WARNING" and "CAUTION".  Any person who is involved in wiring or inspection of this product
shall be fully competent to do the work.
Incorrect handling may cause  This product body must be installed before wiring. Otherwise you
WARNING hazardous conditions, resulting in death may get an electric shock or be injured.
or severe injury.  Setting dial and key operations must be performed with dry
Incorrect handling may cause hands to prevent an electric shock. Otherwise, electric shock
CAUTION hazardous conditions, resulting in may result.
 Do not subject the cables to scratches, excessive stress, heavy
medium or slight injury, or may cause
only material damage. loads or pinching. Otherwise you may get an electric shock.
 Do not change the cooling fan while power is ON as it is
Note that even the level may lead to a dangerous.
CAUTION  Do not touch the printed circuit board or handle the cables with
serious consequence depending on conditions. Be sure to wet hands. Otherwise you may get an electric shock.
follow the instructions of both levels as they are critical to  Before wiring or inspection for a PM motor, confirm that the PM
personnel safety. motor is stopped as a PM motor is a synchronous motor with
high-performance magnets embedded inside and high-voltage is
generated at the motor terminals while the motor is running even
after the power of this product is turned OFF. In an application,
such as fan and blower, that the motor may be driven by the
load, connect a low-voltage manual contactor at the output side
of this product and keep it open during wiring and inspection of
this product. Otherwise you may get an electric shock.
 Never touch the motor terminals, etc. right after powering OFF as
the DC voltage is applied to the motor for 1 second at powering
OFF if the main circuit capacitor capacity is measured. Doing so
may cause an electric shock.
 Fire prevention

CAUTION
 This product must be installed on a nonflammable wall without
any through holes so that nobody touches the heatsink, etc. on
the rear side of this product. Installing it on or near flammable
material may cause a fire.
 If this product has become faulty, the product power must be
switched OFF. A continuous flow of large current may cause a
fire.
 Do not connect a resistor directly to the DC terminals P/+ and N/
-. Doing so could cause a fire.
 Be sure to perform daily and periodic inspections as specified in
the Instruction Manual. If this product is used without any
inspection, a burst, breakage, or a fire may occur.

Safety instructions 1
 Injury prevention
CAUTION
CAUTION
Wiring
 The voltage applied to each terminal must be as specified in the  Do not install a power factor correction capacitor, surge absorber,
Instruction Manual. Otherwise burst, damage, etc. may occur. or radio noise filter on the output side of this product. Doing so
 The cables must be connected to the correct terminals. may be overheated or burn out.
Otherwise burst, damage, etc. may occur.  The output of this product (output terminals U, V, W) must be
 The polarity (+ and -) must be correct. Otherwise burst, damage, correctly connected to a motor. Otherwise the motor rotates
etc. may occur. inversely.
 While power is ON or for some time after power-OFF, do not  Even after the power of this product is turned OFF, a PM motor is
touch this product as it will be extremely hot. Touching these running for a while and the output terminals U, V, and W of this
devices may cause a burn. product wired to the PM motor hold high voltages all that while.
 As some sections on this product such as the coolant or piping Before wiring other terminals, be sure that the PM motor is
port can be heated to high temperatures during operation or stopped. Otherwise you may get an electric shock.
while the cooling system does not yet work fully, do not touch the  Never connect a PM motor to the commercial power supply.
product until it becomes certain that the product temperature is Applying the commercial power to the input terminals (U, V, W)
within a safe range. Touching these devices may cause a burn. on a PM motor will burn the PM motor. The PM motor must be
 Additional instructions applied a power from this product with the output terminals (U, V,
The following instructions must be also followed. If this product W).
is handled incorrectly, it may cause unexpected fault, an injury, Test operation
 Before starting the test operation, confirm or adjust the
or an electric shock. parameter settings. Failure to do so may cause some machines
to make unexpected motions.
CAUTION
Transportation and installation WARNING
 Any person who is opening a package using a sharp object, such
as a knife or cutter, must wear gloves to prevent injuries caused Usage
by the edge of the sharp object.  Any person must stay away from the equipment after using the
 This product must be transported in correct method that retry function in this product as the equipment will restart
corresponds to the weight. Failure to do so may lead to injuries. suddenly after the output shutoff of this product.
 Do not stand or place any heavy object on this product.  Depending on the function settings of this product, the product
 Do not stack the boxes containing this product higher than the does not stop its output even when the STOP/RESET key on the
number recommended. operation panel is pressed. To prepare for it, provide a separate
 When carrying this product, do not hold it by the front cover. circuit and switch (to turn OFF the power of this product, or apply
Doing so may cause a fall or failure of the product. a mechanical brake, etc.) for an emergency stop.
 During installation, caution must be taken not to drop this product  Be sure to turn OFF the start (STF/STR) signal before clearing
as doing so may cause injuries. the fault as this product will restart the motor suddenly after a
 This product must be installed on the surface that withstands the fault clear.
weight of the product.  Do not use a PM motor for an application that the motor may be
 Do not install this product on a hot surface. driven by the load and run at a speed higher than the maximum
 The installing orientation of this product must be correct. motor speed.
 This product must be installed on a strong surface securely with  Use only a three-phase induction motor or PM motor as a load
screws so that it does not drop. on this product. Connection of any other electrical equipment to
 Do not install or operate this product if it is damaged or has parts the output of this product may damage the equipment.
missing.  Performing pre-excitation (by using the LX or X13 signal) during
 Foreign conductive objects must be prevented from entering this torque control (under Real sensorless vector control) may rotate
product. That includes screws and metal fragments or other a motor at a low speed even though a start command (STF or
flammable substance such as oil. STR) is not given. This product with a start command ON may
 As this product is a precision instrument, do not drop or subject it also rotate the motor at a low speed when the speed limit value
to impact. is set to zero. Therefore, confirm that the motor running does not
 The surrounding air temperature must be between -10 and cause any safety problem before performing pre-excitation.
+50°C (non-freezing). Otherwise this product may be damaged.  Do not modify this product.
 The ambient humidity must be 95% RH or less (non-condensing)  Do not remove any part which is not instructed to be removed in
for this product. Otherwise the product may be damaged. (Refer the Instruction Manuals. Doing so may lead to a failure or
to page 19 for details.) damage of this product.
 Use the specified coolant for cooling the liquid cooled type
product (FR-[ ]-LC). Otherwise the product may be damaged.
 The temporary storage temperature (applicable to a short limited
time such as a transportation time) must be between -20 and
+65°C. Otherwise this product may be damaged.
 This product must be used indoors (without corrosive gas,
flammable gas, oil mist, dust and dirt). Otherwise the product
may be damaged.
 This product must be used at an altitude of 2000 m or less, with
2.9 m/s2 or less vibration at 10 to 55 Hz (directions of X, Y, Z
axes). Otherwise the product may be damaged. (For the
installation at an altitude above 1000 m, consider a 3% reduction
in the rated current per 500 m increase in altitude.)
 If halogen-based materials (fluorine, chlorine, bromine, iodine,
etc.), included in fumigants to sterilize or disinfect wooden
packages, infiltrate into this product, the product may be
damaged. Prevent residual fumigant components from being
infiltrated into the product when packaging, or use an alternative
sterilization or disinfection method (heat disinfection, etc.). Note
that sterilization or disinfection of wooden package should be
performed before packing the product.

2 Safety instructions
 Application of caution labels
CAUTION Caution labels are used to ensure safety during use of Mitsubishi
Usage Electric inverters.
 The electronic thermal O/L relay function may not be enough for Apply the following labels to the inverter if the "retry function" and/
protection of a motor from overheating. It is recommended to or "automatic restart after instantaneous power failure" have been
install an external thermal relay or a PTC thermistor for overheat enabled.
protection.  For the retry function
 Do not use a magnetic contactor on the input side of this product
for frequent starting/stopping of this product. Otherwise the life of CAUTION
the product decreases. Retry Function Has
 Use a noise filter or other means to minimize the electromagnetic Been Selected
interference with other electronic equipment used nearby this
product. Stay away from the motor and machine.
 Appropriate measures must be taken to suppress harmonics. They will start suddenly (after given
Otherwise harmonics in power systems generated from this time has elapsed) when alarm occurs.
product may heat/damage a power factor correction capacitor or
a generator.  For automatic restart after instantaneous power failure
 For a 400 V class motor driven by this product, use an insulation-
enhanced motor, or take measures to suppress surge voltage. CAUTION
 As all parameters return to their initial values after Parameter Automatic Restart after
clear or All parameter clear is performed, the needed parameters Instantaneous Power
Failure Has Been Selected
for this product operation must be set again before the operation
is started. Stay away from the motor and machine.
They will start suddenly (after reset
 This product can be easily set for high-speed operation. time has elapsed) when
Therefore, consider all things related to the operation such as the instantaneous power failure occurs.
performance of a motor and equipment in a system before the Application of motor control labels
setting change.
Apply the following labels to the inverter to avoid connecting
 The stop state of this product by the product's brake function (DC motors not intended for a particular motor control setting.
injection brake function) cannot be held. Install a device to apply
brakes to a motor or equipment in a system for safety.
 Before running this product which have been stored and not Induction motor setting
been operated for a long period, perform an inspection and a test The inverter is set for the induction
operation. motor control.
 To avoid damage to this product due to static electricity, static IM LED is ON during induction motor
electricity in your body must be discharged before you touch this control.
Do not drive a PM motor.
product.
 Only one PM motor can be connected to a single unit of this
product.
 A PM motor must be used under PM sensorless vector control.
Do not use a synchronous motor, induction motor, or
synchronous induction motor.
 Do not connect a PM motor to this product at a setting for the
induction motor control (initial setting). Do not connect an
induction motor to this product at a setting for PM motor control. PM motor control setting
Doing so will cause a failure.
The inverter is set for the PM motor
 As a process of starting a PM motor, turn ON the power of this
control.
product first, and then close the contactor on the output side of PM LED is ON during PM motor control.
this product. Do not drive an induction motor.
 To maintain the security (confidentiality, integrity, and availability)
of the inverter and the system against unauthorized access,
DoS attacks, computer viruses, and other cyberattacks from
external devices via network, take appropriate measures such as
firewalls, virtual private networks (VPNs), and antivirus solutions.
We shall have no responsibility or liability for any problems
involving inverter trouble and system trouble by DoS attacks,
unauthorized access, computer viruses, and other cyberattacks.
 Depending on the Ethernet network environment, this product
may not operate as intended due to delays or disconnection in
communication. Carefully consider the conditions on site and
safety for this product.
Emergency stop
 A safety backup such as an emergency brake must be provided
for devices or equipment in a system to prevent hazardous
conditions in case of failure of this product or an external device
controlling this product.
 If a breaker on the input side of this product is tripped, the wiring
must be checked for a fault (such as short circuit), and internal
parts of this product for a damage, etc. Identify and remove the
cause of the trip before resetting the tripped breaker (or before
applying the power to this product again).
 When any protective function is activated, take an appropriate
corrective action before resetting this product to resume the
operation.
Maintenance, inspection and parts replacement
 Do not carry out a megger (insulation resistance) test on the
control circuit of this product. Doing so will cause a failure.
Disposal
 This product must be treated as industrial waste.
 DoS: A denial-of-service (DoS) attack disrupts services by overloading
systems or exploiting vulnerabilities, resulting in a denial-of-service (DoS)
state.

General instruction
 For clarity purpose, illustrations in this Instruction Manual may be
drawn with covers or safety guards removed. Ensure all covers
and safety guards are properly installed prior to starting
operation. For details on the PM motor, refer to the Instruction
Manual of the PM motor.

Safety instructions 3
CONTENTS

1 INTRODUCTION 7
1.1 Product checking and accessories 8

1.2 Component names 9

1.3 About the related manuals 11

2 INSTALLATION AND WIRING 13

2.1 Peripheral devices 14
2.1.1 Inverter and peripheral devices ...................................................................................................................... 14
2.1.2 Peripheral devices.......................................................................................................................................... 16

2.2 Removal and reinstallation of the operation panel or the front cover 17

2.3 Installation of the inverter and enclosure design 19

2.3.1 Inverter installation environment .................................................................................................................... 19
2.3.2 Cooling system types for inverter enclosure .................................................................................................. 22
2.3.3 Inverter installation ......................................................................................................................................... 23
2.3.4 Protruding the heatsink through a panel ........................................................................................................ 24

2.4 Terminal connection diagrams 27

2.5 Main circuit terminals / piping port 35

2.5.1 Descriptions of the main circuit terminals / piping ports ................................................................................. 35
2.5.2 Terminal layout of the main circuit terminals and wiring of power supply / motor .......................................... 36
2.5.3 Piping the cooling system and the drainage pipe........................................................................................... 36
2.5.4 Applicable cables and the wiring length ......................................................................................................... 37
2.5.5 Earthing (grounding) precautions ................................................................................................................... 39
2.5.6 Piping and coolant for the cooling system and the drainage pipe .................................................................. 40

2.6 Control circuit 46

2.6.1 Details on the control circuit terminals............................................................................................................ 46
2.6.2 Control logic (sink/source) change ................................................................................................................. 50
2.6.3 Wiring of control circuit ................................................................................................................................... 52
2.6.4 Wiring precautions.......................................................................................................................................... 54
2.6.5 When using separate power supplies for the control circuit and the main circuit........................................... 55
2.6.6 When supplying 24 V external power to the control circuit............................................................................. 56
2.6.7 Safety stop function........................................................................................................................................ 58

2.7 Communication connectors and terminals 60

2.7.1 PU connector.................................................................................................................................................. 60
2.7.2 USB connector ............................................................................................................................................... 61
2.7.3 RS-485 terminal block (RS-485 model).......................................................................................................... 62
2.7.4 Ethernet port (Ethernet model)....................................................................................................................... 63

2.8 Connection of motor with encoder (vector control) 64

2.9 Parameter settings for a motor with encoder 70

2.10 Connection of stand-alone option units 71

2.10.1 Connection of the brake unit (FR-BU2) .......................................................................................................... 71
2.10.2 Connection of the high power factor converter (FR-HC2) .............................................................................. 72
2.10.3 Connection of the DC reactor (FR-HEL) ........................................................................................................ 73

4 CONTENTS
 2.11 Installing a communication option 74

3 PRECAUTIONS FOR USE OF THE INVERTER 75

3.1 Electro-magnetic interference (EMI) and leakage currents 76
3.1.1 Leakage currents and countermeasures ........................................................................................................76
3.1.2 Countermeasures against inverter-generated EMI.........................................................................................77
3.1.3 Built-in EMC filter ............................................................................................................................................79

3.2 Power supply harmonics 80

3.2.1 Power supply harmonics.................................................................................................................................80

3.3 Power-OFF and magnetic contactor (MC) 81

3.4 Countermeasures against deterioration of the 400 V class motor insulation 82

3.5 Checklist before starting operation 83

3.6 Failsafe system which uses the inverter 86

4 PRECAUTIONS FOR MAINTENANCE AND

INSPECTION 89
4.1 Inspection item 90
4.1.1 Daily inspection...............................................................................................................................................90
4.1.2 Periodic inspection..........................................................................................................................................90
4.1.3 Daily and periodic inspection ..........................................................................................................................91
4.1.4 Continuity test of the inverter and converter modules ....................................................................................93
4.1.5 Cleaning..........................................................................................................................................................93
4.1.6 Replacement of parts......................................................................................................................................94
4.1.7 Removal and reinstallation of the control circuit terminal block ......................................................................97

4.2 Measurement of main circuit voltages, currents, and powers 99

4.2.1 Measurement of powers ...............................................................................................................................102
4.2.2 Measurement of voltages and use of PT ......................................................................................................102
4.2.3 Measurement of currents..............................................................................................................................103
4.2.4 Use of CT and transducer.............................................................................................................................103
4.2.5 Measurement of inverter input power factor .................................................................................................103
4.2.6 Measurement of converter output voltage (across terminals P and N).........................................................103
4.2.7 Measurement of inverter output frequency ...................................................................................................104
4.2.8 Insulation resistance test using megger .......................................................................................................104
4.2.9 Withstand voltage test ..................................................................................................................................104

5 SPECIFICATIONS 105
5.1 Inverter rating 106

5.2 Common specifications 107

5.3 Inverter outline dimensions 109

CONTENTS 5
APPENDIX 111
Appendix 1 Instructions for compliance with the EU Directives............................................................ 112
Appendix 2 Instructions for UL and cUL .................................................................................................. 115
Appendix 3 Instructions for EAC............................................................................................................... 117
Appendix 4 Restricted Use of Hazardous Substances in Electronic and Electrical Products ............ 118
Appendix 5 Referenced Standard (Requirement of Chinese standardized law)................................... 118
Appendix 6 Compliance with the UK certification scheme..................................................................... 119
Appendix 7 Compliance with the EU ErP Directive (Ecodesign Directive)............................................ 119

6 CONTENTS
 1 INTRODUCTION
The contents described in this chapter must be read before using this
product.
Always read the instructions before use.

1.1 Product checking and accessories.........................................8

1.2 Component names....................................................................9
1.3 About the related manuals.......................................................11
<Abbreviations>
DU .................................................. Operation panel (FR-DU08)
Operation panel ............................. Operation panel (FR-DU08) and LCD operation panel (FR-LU08)
Parameter unit ............................... Parameter unit (FR-PU07)
PU .................................................. Operation panel and parameter unit
Inverter ........................................... Mitsubishi Electric inverter FR-A800 Plus series (liquid cooled type)
FR-A800-E ...................................... Mitsubishi Electric FR-A800 liquid cooled inverter (Plus series) Ethernet
model
Ethernet board ............................... Ethernet communication board (FR-A8ETH)
Vector control compatible option .... FR-A8AP/FR-A8AL/FR-A8APR/FR-A8APS (plug-in option)/ FR-A8TP
(control terminal option)
Pr. .................................................. Parameter number (Number assigned to function)
PU operation .................................. Operation using the PU (operation panel/parameter unit)
External operation .......................... Operation using the control circuit signals
Combined operation ...................... Combined operation using the PU (operation panel/parameter unit) and
External operation
<Trademarks>
• All company and product names herein are the trademarks and registered trademarks of their respective
owners. 1
<Notes on descriptions in this Instruction Manual>
• Connection diagrams in this Instruction Manual appear with the control logic of the input terminals as sink
logic, unless otherwise specified. (For the control logic, refer to page 50.)

INTRODUCTION 7
Product checking and accessories

1.1 Product checking and accessories

Unpack the product and check the rating plate and the capacity plate of the inverter to ensure that the model agrees with the
order and the product is intact.
Inverter model
Symbol Voltage class Symbol Description Symbol Type∗1 Communication
4 400 V class 03250 to 06830 Inverter SLD rated current (A) 1 FM
RS-485
110K to 280K Inverter ND rated capacity (kW) 2 CA
E1 FM
Ethernet
E2 CA

F R - A 8 4 0 - 05470 - 1 - LC

Symbol Circuit board coating∗2 Plated conductor Symbol Function

None Without Without LC Liquid cooled type
60 With Without
06 With With

Rating plate
Inverter model 02'(/)5$/&
Input rating ,1387;;;;;
Output rating 287387;;;;;

SERIAL 6(5,$/;;;;;;;;;
Country of origin 0$'(,1;;;;;

 Specification differs by the type. Major differences are shown in the table below.

Initial setting
Type Monitor output Built-in Control Rated Pr.19 Base
EMC filter logic frequency frequency voltage
FM
Terminal FM (pulse train output) Sink 9999 (same as the
(terminal FM Terminal AM (analog voltage output (0 to ±10 VDC)) OFF logic 60 Hz power supply voltage)
equipped model)
CA
(terminal CA Terminal CA (analog current output (0 to 20 mADC)) ON Source 50 Hz 8888 (95% of the
Terminal AM (analog voltage output (0 to ±10 VDC)) logic power supply voltage)
equipped model)
 Conforming to IEC60721-3-3:1994 3C2/3S2

NOTE
• In this Instruction Manual, the inverter model name consists of the applicable motor capacity and the rated current.
(Example) FR-A840-05470(220K)

 How to read the SERIAL number

Rating plate example The SERIAL consists of one symbol, two characters indicating the production
    year and month, and six characters indicating the control number. The last digit
Symbol Year Month Control number of the production year is indicated as the Year, and the Month is indicated by 1
to 9, X (October), Y (November), or Z (December).
SERIAL

 Accessory
• Eyebolt for hanging the inverter
Capacity Eyebolt size Quantity
FR-A840-04320(160K) to FR-A840-04810(185K) M10 2
FR-A840-05470(220K) to FR-A840-06830(280K) M12 2

8 INTRODUCTION
 Component names

1.2 Component names

Component names are shown below.

RS-485 model
(d) (a)
(e) (b)
(h)
(f) (c)

(g) (u)

(k)

(t)

(i) (l)

(j)

(q)
(p)
(s) (o)

(n)

(r)

(v)
(w)

(m)

Refer to
Symbol Name Description
page
Connects the operation panel or the parameter unit. This connector also enables the RS-
(a) PU connector 60
485 communication.
(b) USB A connector Connects a USB memory device. 61
(c) USB mini B connector Connects a personal computer and enables communication with FR Configurator2. 61
(d) RS-485 terminals Enables RS-485, MODBUS RTU communication. 62
Terminating resistor selection
(e) Select whether or not to use the terminating resistor for RS-485 communication. 62
switch (SW1)

1
(f) Plug-in option connector1 Instruction
(g) Plug-in option connector2 Connects a plug-in option or a communication option. Manual of
(h) Plug-in option connector3 the option
(i) Voltage/current input switch (SW2) Selects between voltage and current for the terminal 2 and 4 inputs. 
(j) Control circuit terminal block Connects cables for the control circuit. 46
(k) EMC filter ON/OFF connector Turns ON/OFF the EMC filter. 79
Control logic switchover jumper
(l) Switch the control logic of input signals as necessary. 50
connector
(m) Main circuit terminal block Connects cables for the main circuit. 35
(n) Charge lamp Stays ON while the power is supplied to the main circuit. 36
(o) Alarm lamp Turns ON when the protective function of the inverter is activated. 36
(p) Power lamp Stays ON while the power is supplied to the control circuit (R1/L11, S1/L21). 36
Remove this cover for the installation of the product, installation of a plug-in (communication)
(q) Upper front cover 17
option, RS-485 terminal wiring, switching of the voltage/current input switch, etc.
(r) Lower front cover Remove this cover for wiring. 17
(s) Operation panel (FR-DU08) Operates and monitors the inverter. 60
(t) Cooling fan Cools the inverter. 95
Switches for manufacturer
(u) Do not change the initial setting (OFF
OFF
). ─
setting (SW3 and SW4) ON

(v) Piping port Remove the protective cap to connect the pipes for coolant. 36
(w) Drainage port Used for discharging water leakage. Connect the drainage pipe. 36
 Refer to the FR-A800 Instruction Manual (Detailed).

INTRODUCTION 9
Component names

Ethernet model
(g)
(h)
(b)
(i)
(a)
(t)
(c)

(s)

(j)

(d)
(k)
(e)

(f)

(p)
(o) (n)
(r)

(m)

(q)

(v)
(u)

(l)

Refer to
Symbol Name Description
page
(a) Plug-in option connector1 Instruction
Connects a plug-in option or a communication option. Manual of
(b) Plug-in option connector3 the option
The connector 2 cannot be used because the Ethernet board is installed in the initial
(c) Plug-in option connector2 status. The Ethernet board must be removed to install a plug-in option to the 63
connector 2. (However, Ethernet communication is disabled in that case.)
(d) Voltage/current input switch (SW2) Selects between voltage and current for the terminal 2 and 4 inputs. 
Ethernet communication
(e) Connect the Ethernet dedicated cable for connection to the network. 63
connector
(f) Control circuit terminal block Connects cables for the control circuit. 46
Connects the operation panel or the parameter unit. This connector also enables the
(g) PU connector 60
RS-485 communication.
(h) USB A connector Connects a USB memory device. 61
(i) USB mini B connector Connects a personal computer and enables communication with FR Configurator2. 61
(j) EMC filter ON/OFF connector Turns ON/OFF the EMC filter. 79
Control logic switchover
(k) Switch the control logic of input signals as necessary. 50
jumper connector
(l) Main circuit terminal block Connects cables for the main circuit. 35
(m) Charge lamp Stays ON while the power is supplied to the main circuit. 36
(n) Alarm lamp Turns ON when the protective function of the inverter is activated. 36
(o) Power lamp Stays ON while the power is supplied to the control circuit (R1/L11, S1/L21). 36
Remove this cover for the installation of the product, installation of a plug-in (communication)
(p) Upper front cover 17
option, RS-485 terminal wiring, switching of the voltage/current input switch, etc.
(q) Lower front cover Remove this cover for wiring. 17
(r) Operation panel (FR-DU08) Operates and monitors the inverter. 60
(s) Cooling fan Cools the inverter. 95
Switches for manufacturer
(t) Do not change the initial setting (OFF OFF
). ─
setting (SW3 and SW4) ON

(u) Piping port Remove the protective cap to connect the pipes for coolant. 36
(v) Drainage port Used for discharging water leakage. Connect the drainage pipe. 36
 Refer to the FR-A800 Instruction Manual (Detailed).

10 INTRODUCTION
 About the related manuals

1.3 About the related manuals

The manuals related to FR-A840-LC are shown below.

Manual name Manual number

FR-A800 Instruction Manual (Detailed) IB-0600503ENG
Ethernet Function Manual IB-0600628ENG
FR Configurator2 Instruction Manual IB-0600516ENG
FR-A800/F800 PLC Function Programming Manual IB-0600492ENG
FR-A800-LC Safety stop function instruction manual BCN-A23228-015

INTRODUCTION 11
MEMO

12
 2 INSTALLATION AND
WIRING

This chapter explains the installation and the wiring of this product.
Always read the instructions before use.

2.1 Peripheral devices ....................................................................14

2.2 Removal and reinstallation of the operation panel or the 17
front cover .................................................................................
2.3 Installation of the inverter and enclosure design ..................19
2.4 Terminal connection diagrams ................................................27
2.5 Main circuit terminals / piping port .........................................35
2.6 Control circuit ...........................................................................46
2.7 Communication connectors and terminals ............................60
2.8 Connection of motor with encoder (vector control) ..............64
2.9 Parameter settings for a motor with encoder ........................70
2.10 Connection of stand-alone option units .................................71
2.11 Installing a communication option..........................................74

INSTALLATION AND WIRING 13

Peripheral devices

2.1 Peripheral devices

2.1.1 Inverter and peripheral devices

(b) Three-phase AC power supply (a) Inverter (FR-A840-LC) (g) USB connector

USB host
(A connector)
Communication
status indicator USB
(LED) (USB host)
(c) Molded case circuit breaker
(MCCB) or earth leakage current
USB device
breaker (ELB), fuse
(Mini B connector)

Personal computer
(FR Configurator2)

(d) Magnetic contactor (MC)

(e) DC reactor
(f) Noise filter
(FR-HEL)

R/L1 S/L2 T/L3 P/+ N/- IM connection PM connection

P/+ P1
U VW U VW

(l) Noise filter

Earth
(Ground)

(m) Contactor
Example) No-fuse
switch
(DSN type)

(h) Brake unit

(FR-BU2)

(n) PM motor

(k) Induction
motor
Earth
P/+ PR (Ground)
P/+
PR Earth (Ground)
: Install these options as required.
(g) High power factor converter (i) Resistor unit
(FR-HC2) (MT-BR5)

NOTE
• To prevent an electric shock, always earth (ground) the motor and inverter.
• Do not install a power factor correction capacitor or surge suppressor or capacitor type filter on the inverter's output side.
Doing so will cause the inverter to trip or the capacitor and surge suppressor to be damaged. If any of the above devices is
connected, immediately remove it. When installing a molded case circuit breaker on the output side of the inverter, contact
the manufacturer of the molded case circuit breaker.
• Electromagnetic wave interference
The input/output (main circuit) of the inverter includes high frequency components, which may interfere with the
communication devices (such as AM radios) used near the inverter. In this case, activating the EMC filter may minimize
interference. (Refer to page 79.)
• For details of options and peripheral devices, refer to the respective Instruction Manual.
• A PM motor cannot be driven by the commercial power supply.
• A PM motor is a motor with permanent magnets embedded inside. High voltage is generated at the motor terminals while the
motor is running. Before closing the contactor at the output side, make sure that the inverter power is ON and the motor is
stopped.

14 INSTALLATION AND WIRING

 Peripheral devices

Refer
Symbol Name Overview
to page
The life of the inverter is influenced by the surrounding air temperature.
The surrounding air temperature should be as low as possible within the
permissible range. This must be noted especially when the inverter is
19
installed in an enclosure.
(a) Inverter (FR-A840-LC) 27
Incorrect wiring may lead to damage of the inverter. The control signal
79
lines must be kept fully away from the main circuit lines to protect them
from noise.
The built-in EMC filter can reduce the noise.
(b) Three-phase AC power supply Must be within the permissible power supply specifications of the inverter. 106
Molded case circuit breaker (MCCB),
Must be selected carefully since an inrush current flows in the inverter at
(c) earth leakage circuit breaker (ELB), or 16
power ON.
fuse
Install this to ensure safety.
(d) Magnetic contactor (MC) Do not use this to start and stop the inverter. Doing so will shorten the life 81
of the inverter.
Install this to suppress harmonics and to improve the power factor.
(e) DC reactor (FR-HEL) Select a DC reactor according to the applied motor capacity, and always 73
keep it connected.
(f) Noise filter Suppresses the noise radiated from the power supply side of the inverter. 77
Suppresses the power supply harmonics significantly. Install this as
(g) High power factor converter (FR-HC2) 72
required.
(h) Brake unit (FR-BU2) Allows the inverter to provide the optimal regenerative braking capability.
71
(i) Resistor unit (MT-BR5) Install this as required.
A USB (Ver. 1.1) cable connects the inverter with a personal computer.
(j) USB connection 61
A USB memory device enables parameter copies and the trace function.
Install this to reduce the electromagnetic noise generated from the
(k) Noise filter 77
inverter.
(l) Induction motor Connect a squirrel-cage induction motor. ―
Connect this for an application where a PM motor is driven by the load
Contactor
(m) even while the inverter power is OFF. Do not open or close the contactor ―
Example) No-fuse switch (DSN type)
while the inverter is running (outputting).
Use the specified motor. A PM motor cannot be driven by the commercial
(n) PM motor ―
power supply.

INSTALLATION AND WIRING 15

Peripheral devices

2.1.2 Peripheral devices

Check the model of the inverter you purchased. Appropriate peripheral devices must be selected according to the capacity.
Refer to the table below to prepare appropriate peripheral devices.

ND rating (Pr.570 Multiple rating setting = "2")

Molded case circuit breaker (MCCB) or
Motor output Input-side magnetic
Applicable inverter model earth leakage circuit breaker (ELB)
(kW) contactor
(NF, NV type)
110 FR-A840-03250(110K)-LC 225A S-N180
132 FR-A840-03610(132K)-LC 350A S-N220
160 FR-A840-04320(160K)-LC 400A S-N300
185 FR-A840-04810(185K)-LC 400A S-N300
220 FR-A840-05470(220K)-LC 500A S-N400
250 FR-A840-06100(250K)-LC 600A S-N600
280 FR-A840-06830(280K)-LC 600A S-N600

 Assumes the use of a 4-pole standard motor with the power supply voltage of 400 VAC 50 Hz.
 Select an MCCB according to the power supply capacity.
Install one MCCB per inverter. MCCB INV M
(For the use in the United States or Canada, refer to page 115 to select the appropriate fuse.)
MCCB INV M

 The magnetic contactor is selected based on the AC-1 class. The electrical durability of magnetic contactor is 500,000 times. When the
magnetic contactor is used for emergency stops during motor driving, the electrical durability is 25 times.

NOTE
• When the inverter capacity is larger than the motor capacity, select an MCCB and a magnetic contactor according to the
inverter model, and select cables and reactors according to the motor output.
• When the breaker on the inverter's input side trips, check for the wiring fault (short circuit), damage to internal parts of the
inverter etc. The cause of the trip must be identified and removed before turning ON the power of the breaker.

LD rating (Pr.570 Multiple rating setting = "1")

Molded case circuit breaker (MCCB) or
Motor output Input-side magnetic
Applicable inverter model earth leakage circuit breaker (ELB)
(kW) contactor
(NF, NV type)
132 FR-A840-03250(110K)-LC 350A S-N220
160 FR-A840-03610(132K)-LC 400A S-N300
185 FR-A840-04320(160K)-LC 400A S-N300
220 FR-A840-04810(185K)-LC 500A S-N400
250 FR-A840-05470(220K)-LC 600A S-N600
280 FR-A840-06100(250K)-LC 600A S-N600
315 FR-A840-06830(280K)-LC 800A S-N800

 Assumes the use of a 4-pole standard motor with the power supply voltage of 400 VAC 50 Hz.
 Select an MCCB according to the power supply capacity.
Install one MCCB per inverter. MCCB INV M
(For the use in the United States or Canada, refer to page 115 to select the appropriate fuse.)
MCCB INV M

 Magnetic contactor is selected based on the AC-1 class. The electrical durability of magnetic contactor is 500,000 times. When the magnetic
contactor is used for emergency stops during motor driving, the electrical durability is 25 times.

NOTE
• When the inverter capacity is larger than the motor capacity, select an MCCB and a magnetic contactor according to the
inverter model, and select cables and reactors according to the motor output.
• When the breaker on the inverter's input side trips, check for the wiring fault (short circuit), damage to internal parts of the
inverter etc. The cause of the trip must be identified and removed before turning ON the power of the breaker.

16 INSTALLATION AND WIRING

 Removal and reinstallation of the operation panel or the front cover

2.2 Removal and reinstallation of the operation

panel or the front cover
Removal and reinstallation of the operation panel

• Loosen the two screws on the operation panel. • Press the upper edge of the operation panel while pulling
(These screws cannot be removed.) out the operation panel.

To reinstall the operation panel, align its connector on the back with the PU connector of the inverter, and insert the operation
panel. After confirming that the operation panel is fit securely, tighten the screws. (Tightening torque: 0.40 to 0.45 N·m)

Removal of the lower front cover

(a) When the mounting screws are removed, the lower front cover can be removed.
(b) With the lower front cover removed, wiring of the main circuit terminals can be performed.

INSTALLATION AND WIRING 17

Removal and reinstallation of the operation panel or the front cover

Removal of the upper front cover

Loosen

(a) With the lower front cover removed, loosen the mounting screws on the upper front cover. (These screws cannot be removed.)
(b) Holding the areas around the installation hooks on the sides of the upper front cover, pull out the cover using its upper side as a
support.
(c) With the upper front cover removed, wiring of the RS-485 terminals and installation of the plug-in option can be performed.

Reinstallation of the front covers

(a) (b) (c)

Tighten Tighten

(a) Insert the upper hooks of the upper front cover into the sockets of the inverter.
Securely install the upper front cover to the inverter by fixing the hooks on the sides of the cover into place.
(b) Tighten the mounting screw(s) at the lower part of the upper front cover.
(c) Fasten the lower front cover with the mounting screws.

NOTE
• Fully make sure that the front covers are installed securely. Always tighten the mounting screws of the front covers.

18 INSTALLATION AND WIRING

 Installation of the inverter and enclosure design

2.3 Installation of the inverter and enclosure design

When designing or manufacturing an inverter enclosure, determine the structure, size, and device layout of the enclosure by
fully considering the conditions such as heat generation of the contained devices and the operating environment. An inverter
unit uses many semiconductor devices. To ensure higher reliability and long period of operation, operate the inverter in the
ambient environment that completely satisfies the equipment specifications.

2.3.1 Inverter installation environment

The following table lists the standard specifications of the inverter installation environment. Using the inverter in an
environment that does not satisfy the conditions deteriorates the performance, shortens the life, and causes a failure. Refer to
the following points, and take adequate measures.

Standard environmental specifications of the inverter

Item Description
Measurement
position
Surrounding Inverter
air LD, ND (initial setting) -10 to +50°C (non-freezing) 5 cm 5 cm
temperature
Measurement 5 cm
position
With circuit board coating (conforming to IEC60721-3-3:1994 3C2/3S2): 95% RH or
Ambient humidity
less (noncondensing), Without circuit board coating: 90% RH or less (non-condensing)
Coolant temperature 1 to 40°C (non-freezing)
FR-A840-03250(110K),
Coolant 3.0 to 3.7 L/min
03610(132K)
Coolant flow rate
FR-A840-04320(160K)
 6.0 to 7.5 L/min
to 06830(280K)
Maximum permissible pressure 300 kPa
Storage temperature -20 to +65°C
Atmosphere Indoors (free from corrosive gas, flammable gas, oil mist, dust and dirt)
Altitude 2000 m or less
Vibration 2.9 m/s2 or less at 10 to 55 Hz (directions of X, Y, Z axes)
 Condensation may occur depending on the humidity and the coolant temperature. Adjust the humidity and the coolant temperature to prevent
condensation.
 Under normal condition, keep the flow rate between 3.2 and 3.5 L/min for the FR-A840-03610(132K) or lower and between 6.5 and 7.0 L/min for
the FR-A840-04320(160K) or higher.
 Temperature applicable for a short time, e.g. in transit.
To store the inverter after the coolant has passed through the pipes, fill the pipes with coolant sufficiently enough, that it contains antifreezing agent
to prevent corrosion. Or fill the pipes with nitrogen gas after the inside of the pipes is fully dried. If any moisture remains inside the pipes, it may
react with oxygen in the air to form corrosion.
 For the installation at an altitude above 1000 m, consider a 3% reduction in the rated current per 500 m increase in altitude.

Temperature
The permissible surrounding air temperature of the inverter is between -10°C and +50°C. Always operate the inverter within
this temperature range. Operation outside this range will considerably shorten the service lives of the semiconductors, parts,
capacitors and others. Take the following measures to keep the surrounding air temperature of the inverter within the specified
range.
(a) Measures against high temperature
• Use a forced ventilation system or similar cooling system. (Refer to page 22.)
2
• Install the enclosure in an air-conditioned electric chamber.
• Block direct sunlight.
• Provide a shield or similar plate to avoid direct exposure to the radiated heat and wind of a heat source.
• Ventilate the area around the enclosure well.
(b) Measures against low temperature
• Provide a space heater in the enclosure.
• Do not power OFF the inverter. (Keep the start signal of the inverter OFF.)
• When the coolant temperature is higher than the surrounding air temperature, let the coolant circulate.
(c) Sudden temperature changes
• Select an installation place where temperature does not change suddenly.
• Avoid installing the inverter near the air outlet of an air conditioner.
• If temperature changes are caused by opening/closing of a door, install the inverter away from the door.

INSTALLATION AND WIRING 19

Installation of the inverter and enclosure design

NOTE
• For the amount of heat generated by the inverter unit, refer to page 42.

Humidity
Operate the inverter within the ambient air humidity of usually 45 to 90% (up to 95% with circuit board coating). Too high
humidity will pose problems of reduced insulation and metal corrosion. On the other hand, too low humidity may cause a
spatial electrical breakdown.
The insulation distance defined in JEM1103 "Control Equipment Insulator" is humidity of 45 to 85%.
(a) Measures against high humidity
• Make the enclosure enclosed, and provide it with a hygroscopic agent.
• Provide dry air into the enclosure from outside.
• Provide a space heater in the enclosure.
(b) Measures against low humidity
Air with proper humidity can be blown into the enclosure from outside. Also when installing or inspecting the unit, discharge
your body (static electricity) beforehand, and keep your body away from the parts and patterns.
(c) Measures against condensation
Condensation may occur if frequent operation stops change the in-enclosure temperature suddenly or if the outside air
temperature changes suddenly.
Condensation causes such faults as reduced insulation and corrosion.
• Take the measures against high humidity in (a).
• Do not power OFF the inverter. (Keep the start signal of the inverter OFF.)
• When the coolant temperature is lower than the surrounding air temperature, do not let the coolant circulate while the
inverter is stopped.

Coolant flow rate

Under normal condition, keep the flow rate between 3.1 and 3.5 L/min for the FR-A840-03610(132K) or lower and between
6.5 and 7.0 L/min for the FR-A840-04320(160K) or higher. When the inverter is continuously operated at the flow rate more
than the maximum specifications (3.7 L/min for the FR-A840-03610(132K) or lower, 7.5 L/min for the FR-A840-04320(160K)
or higher), copper pipes may corrode or leak, resulting in damage of the inverter. On the contrary, when the inverter is
continuously operated at the flow rate less than the minimum specifications (2.9 L/min for the FR-A840-03610(132K) or lower,
6.0 L/min for the FR-A840-04320(160K) or higher), impurities may deposit and degrade the cooling performance, resulting in
corrosion of the pipes or inverter failures.
The internal pressure loss and the internal head according to the flow rate of coolant are as follows.
FR-A840-03610(132K) or lower
Flow rate [L/min] Internal pressure loss [kPa] Internal head [kPa]
3.0 8.5 3.3
3.2 9.5 3.3
3.5 11.2 3.3
3.7 12.4 3.3

FR-A840-04320(160K), FR-A840-04810(185K)
Flow rate [L/min] Internal pressure loss [kPa] Internal head [kPa]
6.0 6.3 4.7
6.5 7.3 4.7
7.0 8.4 4.7
7.5 9.5 4.7

FR-A840-05470(220K) or higher
Flow rate [L/min] Internal pressure loss [kPa] Internal head [kPa]
6.0 11.0 8.3
6.5 12.7 8.3
7.0 14.5 8.3
7.5 16.5 8.3

20 INSTALLATION AND WIRING

 Installation of the inverter and enclosure design

Dust, dirt, oil mist

Dust and dirt will cause such faults as poor contacts, reduced insulation and cooling effect due to the moisture-absorbed
accumulated dust and dirt, and in-enclosure temperature rise due to a clogged filter. In an atmosphere where conductive
powder floats, dust and dirt will cause such faults as malfunction, deteriorated insulation and short circuit in a short time.
Since oil mist will cause similar conditions, it is necessary to take adequate measures.

Countermeasures
• Place the inverter in a totally enclosed enclosure.
Take measures if the in-enclosure temperature rises. (Refer to page 22.)
• Purge air.
Pump clean air from outside to make the in-enclosure air pressure higher than the outside air pressure.

Corrosive gas, salt damage

If the inverter is exposed to corrosive gas or to salt near a beach, the printed board patterns and parts will corrode or the
relays and switches will result in poor contact.
In such places, take the measures given in the previous paragraph.

Explosive, flammable gases

As the inverter is non-explosion proof, it must be contained in an explosion-proof enclosure. In places where explosion may
be caused by explosive gas, dust or dirt, an enclosure cannot be used unless it structurally complies with the guidelines and
has passed the specified tests. This makes the enclosure itself expensive (including the test charges). The best way is to
avoid installation in such places and install the inverter in a non-hazardous place.

High altitude
Use the inverter at an altitude of within 2000 m. For use at an altitude above 1000 m, consider a 3% reduction in the rated
current per 500 m increase in altitude.
If it is used at a higher place, it is likely that thin air will reduce the cooling effect and low air pressure will deteriorate dielectric
strength.

Vibration, impact
The vibration resistance of the inverter is up to 2.9 m/s2 at 10 to 55 Hz frequency and 1 mm amplitude for the directions of X,
Y, Z axes. Applying vibration and impacts for a long time may loosen the structures and cause poor contacts of connectors,
even if those vibration and impacts are within the specified values.
Especially when impacts are applied repeatedly, caution must be taken because such impacts may break the installation feet.

Countermeasure
• Provide the enclosure with rubber vibration isolators.
• Strengthen the structure to prevent the enclosure from resonance.
• Install the enclosure away from the sources of the vibration.

INSTALLATION AND WIRING 21

Installation of the inverter and enclosure design

2.3.2 Cooling system types for inverter enclosure

From the enclosure that contains the inverter, the heat of the inverter and other equipment (transformers, lamps, resistors,
etc.) and the incoming heat such as direct sunlight must be dissipated to keep the in-enclosure temperature lower than the
permissible temperatures of the in-enclosure equipment including the inverter.
The cooling systems are classified as follows in terms of the cooling calculation method.
(a) Cooling by natural heat dissipation from the enclosure surface (totally enclosed type)
(b) Cooling by heatsink (aluminum fin, etc.)
(c) Cooling by ventilation (forced ventilation type, pipe ventilation type)
(d) Cooling by heat exchanger or cooler (heat pipe, cooler, etc.)

Cooling system Enclosure structure Comment

This system is low in cost and generally used, but the

Natural ventilation
enclosure size increases as the inverter capacity increases.
(enclosed type / open type) INV
This system is for relatively small capacities.

Natural
Being a totally enclosed type, this system is the most
Natural ventilation (totally appropriate for hostile environment having dust, dirt, oil mist,
enclosed type) etc. The enclosure size increases depending on the inverter
INV capacity.

Heatsink This system has restrictions on the heatsink mounting position

Heatsink cooling INV and area. This system is for relatively small capacities.

This system is for general indoor installation. This is

Forced ventilation appropriate for enclosure downsizing and cost reduction, and
Forced air INV often used.

Heat
pipe
Heat pipe This is a totally enclosed for enclosure downsizing.
INV

22 INSTALLATION AND WIRING

 Installation of the inverter and enclosure design

2.3.3 Inverter installation

Inverter placement

• Install the inverter on a strong surface securely with screws.

• Leave enough clearances and take cooling measures.
• Avoid places where the inverter is subjected to direct sunlight, high temperature and high humidity.
• Install the inverter on a nonflammable wall surface.
• When encasing multiple inverters, install them in parallel as a cooling measure.
• For heat dissipation and maintenance, keep clearance between the inverter and the other devices or enclosure surface.
The clearance below the inverter is required as a wiring space, and the clearance above the inverter is required as a heat
dissipation space.
• When designing or building an enclosure for the inverter, carefully consider influencing factors such as heat generation of
the contained devices and the operating environment.

Clearances (front) Clearances (side)

20 cm
or more

5 cm
or more
10 cm ∗1
10 cm
or more or more Inverter
Vertical

Allow clearance

20 cm
or more

 For replacing the cooling fan, 30 cm of space is necessary in front of the inverter. Refer to page 95 for fan replacement.

 Installation orientation of the inverter

Install the inverter on a wall as specified. Do not mount it horizontally or in any other way. 2
Above the inverter
Heat is blown up from inside the inverter by the small fan built in the unit. Any equipment placed above the inverter should be
heat resistant.

INSTALLATION AND WIRING 23

Installation of the inverter and enclosure design

Arrangement of multiple inverters

When multiple inverters are placed in the same
enclosure, generally arrange them horizontally as shown
in the right figure (a). When it is inevitable to arrange Inverter Inverter Inverter Inverter
them vertically to minimize space, take such measures as
to provide guides since heat from the bottom inverters
Guide Guide Guide
can increase the temperatures in the top inverters,
causing inverter failures.
Inverter Inverter

When mounting multiple inverters, fully take caution not

to make the surrounding air temperature of the inverter Enclosure Enclosure

higher than the permissible value by providing ventilation (a) Horizontal arrangement (b) Vertical arrangement

and increasing the enclosure size. Arrangement of multiple inverters

Arrangement of the ventilation fan and inverter

Heat generated in the inverter is blown up from the bottom of
the unit as warm air by the cooling fan. When installing a
ventilation fan for that heat, determine the place of ventilation
fan installation after fully considering an air flow. (Air passes
through areas of low resistance. Make an airway and airflow
plates to expose the inverter to cool air.) Inverter Inverter

<Good example> <Bad example>

Arrangement of the ventilation fan and inverter

2.3.4 Protruding the heatsink through a panel

For separating the electric wiring section and the coolant piping section, this installation method is recommended.

Using the panel through attachment (FR-A8CN)

For the FR-A840-03250(110K) or FR-A840-03610(132K), its heatsink can be protruded using the panel through attachment
(FR-A8CN). (For FR-A840-04320(160K) or higher, the attachment is not required to protrude its heatsink.)
For the enclosure cut dimensions and the installation procedure of the panel through attachment (FR-A8CN) to the inverter,
refer to the Instruction Manual of the FR-A8CN.

24 INSTALLATION AND WIRING

 Installation of the inverter and enclosure design

 Heatsink protrusion
 Panel cutting
Cut the panel of the enclosure according to the inverter capacity.

FR-A840-03250(110K), 03610(132K)-LC FR-A840-04320(160K), 04810(185K)-LC

3.5 470 3.5 484

4-M10 screw 440 200 200
3-M10 screw 42 42
43

108

13
821

Hole
797

884

1015

983
Hole

87 303 (87) 1074

98.5 280 (98.5) 2-M12 screw
477 80 324 80
97 290 97

(Unit: mm) (Unit: mm)

FR-A840-05470(220K), 06100(250K), 06830(280K)-LC

662
6-M10 screw
300 300
15
954

Hole
1054

2
100

15

146 188
330 270

(Unit: mm)

INSTALLATION AND WIRING 25

Installation of the inverter and enclosure design

Shift and removal of a rear side installation frame

One installation frame is attached to each of the upper and lower parts of the Shift Upper installation
inverter. Change the position of the rear side installation frame on the upper frame
and lower sides of the inverter to the front side as shown on the right. When
changing the installation frames, make sure that the installation orientation is
correct.

Lower installation
frame
Shift

Installation of the inverter

Push the inverter heatsink portion outside the enclosure and fix the enclosure and inverter with upper and lower installation
frame.
Enclosure
Inside the
enclosure Exhausted air

There are finger guards behind the enclosure.

Therefore, the thickness of the panel should be
Inverter less than 10 mm (∗) and also do not place
anything around finger guards to avoid contact
with the finger guards.

Installation frame

Dimension of
the outside of
Cooling
wind the enclosure
185 mm

NOTE
• Having a cooling fan, the cooling section which comes out of the enclosure cannot be used in the environment of water drops,
oil, mist, dust, etc.
• Be careful not to drop screws, dust etc. into the inverter and cooling fan section.
• The cutout hole on the enclosure is uncovered, which makes enough room to allow the piping and the drainage ports pass
through out the enclosure. Fill the hole with something to cover it for complete separation between inside and outside of the
enclosure.

FR-A840-03250(110K) to FR-A840-04810(185K) FR-A840-05470(220K) to FR-A840-06830(280K)

26 INSTALLATION AND WIRING

 Terminal connection diagrams

2.4 Terminal connection diagrams

FM type (RS-485 model)
DC reactor
(FR-HEL)∗1
Sink logic
Main circuit terminal
Control circuit terminal
Earth
(Ground)
P1 P/+ N/-
MCCB MC
R/L1
Three-phase
S/L2 Inrush current
AC power
T/L3 limit circuit U
supply
V Motor
R1/L11 ON EMC filter M
Jumper W
∗2 S1/L21 ON/OFF
OFF connecter Earth (Ground)
Earth
(Ground) Main circuit
Control input signals Control circuit Relay output∗7
(No voltage input allowed)∗3
STF C1
Forward rotation start
STR B1
Reverse rotation start Relay output 1
A1 (Fault output)
STP(STOP)
Start self-holding selection
RH C2
High speed
RM B2
Multi-speed Middle speed Relay output 2
selection A2
RL
Low speed
JOG ∗4 RUN Open collector output∗8
Jog operation Running
RT SU
Second function selection Up to frequency
MRS IPF
Output stop Instantaneous
RES OL power failure
Reset Overload
Terminal 4 input selection AU FU
Frequency detection
SOURCE

(Current input selection)

Selection of automatic restart CS SE
SINK

Open collector output common

after instantaneous
power failure Sink/source common
SD
Contact input common 24V

24VDC power supply PC

(Common for external power supply transistor)
24V external power +24 PU
supply input
SD connector
Common terminal ∗5 Voltage/current
input switch
Frequency setting signals (Analog) 10E(+10V) ON F/C + - Indicator
OFF USB A (FM) (Frequency meter, etc.)
10(+5V) 2 4 connector ∗9
3 Calibration Moving-coil type
Frequency setting DC0 to 5V Initial value
2 SD resistor ∗10 1mA full-scale
potentiometer 2 DC0 to 10V selectable
∗5 USB
1/2W1kΩ∗6 DC0 to 20mA
1 5 mini B
(Analog common) AM (+)
connector Analog signal output
5 (0 to ±10VDC)

2
DC0 to ±10V Initial value (-)
Auxiliary (+) 1 DC0 to ±5V selectable
(-) ∗5
input RS-485 terminals
TXD+
DC4 to 20mA Initial value
Terminal 4 input (+) 4 Data
DC0 to 5V selectable ∗5 TXD-
(Current input) (-) DC0 to 10V transmission
RXD+
Connector for plug-in option connection Connector 1 Connector 2 Data
RXD-
reception
Connector 3 GND
(SG)
GND
Safety stop signal Shorting 24V
wire PC Terminating
VCC 5V
resistor
S1 (Permissible load current 100mA)
Safety stop input (Channel 1)
S2 Output shutoff So (SO)
Safety stop input (Channel 2) Safety monitor output
circuit
SIC
Safety stop input common SOC
SD Safety monitor output common

INSTALLATION AND WIRING 27

Terminal connection diagrams
 Always connect a DC reactor (FR-HEL), which is available as an option. (To select a DC reactor, refer to page 106, and select one according to
the applicable motor capacity.)
 When using separate power supply for the control circuit, remove the jumper between R1/L11 and S1/L21.
 The function of these terminals can be changed with the input terminal assignment (Pr.178 to Pr.189).
 Terminal JOG is also used as a pulse train input terminal. Use Pr.291 to choose JOG or pulse.
 Terminal input specifications can be changed by analog input specification switchover (Pr.73, Pr.267). To input a voltage, set the voltage/current
input switch OFF. To input a current, set the voltage/current input switch ON. Terminals 10 and 2 are also used as a PTC input terminal. (Pr.561)
 It is recommended to use 2 W 1 k when the frequency setting signal is changed frequently.
 The function of these terminals can be changed with the output terminal assignment (Pr.195, Pr.196).
 The function of these terminals can be changed with the output terminal assignment (Pr.190 to Pr.194).
 The terminal FM can be used to output pulse trains as open collector output by setting Pr.291.
 Not required when calibrating the scale with the operation panel.

NOTE
• To prevent a malfunction due to noise, keep the signal cables 10 cm or more away from the power cables. Also, separate the
main circuit cables at the input side from the main circuit cables at the output side.
• After wiring, wire offcuts must not be left in the inverter.
Wire offcuts can cause an alarm, failure or malfunction. Always keep the inverter clean.
When drilling mounting holes in an enclosure etc., take caution not to allow chips and other foreign matter to enter the
inverter.
• Set the voltage/current input switch correctly. Incorrect setting may cause a fault, failure or malfunction.
• For the parameter details, refer to the Instruction Manual (Detailed).

28 INSTALLATION AND WIRING

 Terminal connection diagrams

CA type (RS-485 model)

DC reactor
(FR-HEL)∗1
Source logic
Main circuit terminal
Control circuit terminal
Earth
(Ground)
P1 P/+ N/-
MCCB MC
R/L1
Three-phase
S/L2 Inrush current
AC power
T/L3 limit circuit
supply U
R1/L11 ON V Motor
Jumper EMC filter M
∗2 S1/L21 ON/OFF W
OFF connecter
Earth Earth (Ground)
(Ground) Main circuit
Control input signals Control circuit Relay output∗7
(No voltage input allowed)∗3
STF C1
Forward rotation start
STR B1
Reverse rotation start Relay output 1
A1 (Fault output)
STP(STOP)
Start self-holding selection
RH C2
High speed
RM B2
Multi-speed Middle speed Relay output 2
selection A2
RL
Low speed
JOG ∗4 RUN Open collector output∗8
Jog operation Running
RT SU
Second function selection Up to frequency
MRS IPF
Output stop Instantaneous
RES OL power failure
Reset Overload
Terminal 4 input selection AU FU
Frequency detection
SOURCE

(Current input selection)

Selection of automatic restart CS SE
SINK

Open collector output common

after instantaneous power failure Sink/source common
Common for external power SD
24V
supply transistor
Contact input common PC
24VDC power supply

24V external power +24

supply input PU
Common terminal
SD ∗5 Voltage/current connector
input switch
F/C
Frequency setting signals (Analog) 10E(+10V) ON (+)
(CA) Analog current output
OFF USB A
10(+5V) 2 4 connector (-) (0 to 20mADC)
3
Frequency setting 2 DC0 to 5V Initial value
potentiometer 2 DC0 to 10V selectable
∗5 USB AM (+)
1/2W1kΩ∗6 DC0 to 20mA Analog signal output
1 5 mini B
(Analog common) (DC0 to ±10V)
connector (-)
5
DC0 to ±10V Initial value
Auxiliary (+) 1 DC0 to ±5V selectable
(-) ∗5
input RS-485 terminals
TXD+

2
DC4 to 20mA Initial value
Terminal 4 input (+) 4 DC0 to 5V Data
selectable ∗5 TXD-
(Current input) (-) DC0 to 10V transmission
RXD+
Connector for plug-in option connection Connector 1 Connector 2 Data
RXD-
reception
Connector 3 GND
(SG)
GND
Safety stop signal Shorting 24V
wire PC Terminating
VCC 5V
resistor
S1 (Permissible load current 100mA)
Safety stop input (Channel 1)
S2 Output shutoff
Safety stop input (Channel 2) So (SO)
circuit Safety monitor output
SIC
Safety stop input common SOC
SD Safety monitor output common

INSTALLATION AND WIRING 29

Terminal connection diagrams
 Always connect a DC reactor (FR-HEL), which is available as an option. (To select a DC reactor, refer to page 106, and select one according to
the applicable motor capacity.)
 When using separate power supply for the control circuit, remove the jumper between R1/L11 and S1/L21.
 The function of these terminals can be changed with the input terminal assignment (Pr.178 to Pr.189).
 Terminal JOG is also used as a pulse train input terminal. Use Pr.291 to choose JOG or pulse.
 Terminal input specifications can be changed by analog input specification switchover (Pr.73, Pr.267). To input a voltage, set the voltage/current
input switch OFF. To input a current, set the voltage/current input switch ON. Terminals 10 and 2 are also used as a PTC input terminal. (Pr.561)
 It is recommended to use 2 W 1 k when the frequency setting signal is changed frequently.
 The function of these terminals can be changed with the output terminal assignment (Pr.195, Pr.196).
 The function of these terminals can be changed with the output terminal assignment (Pr.190 to Pr.194).

NOTE
• To prevent a malfunction due to noise, keep the signal cables 10 cm or more away from the power cables. Also, separate the
main circuit cables at the input side from the main circuit cables at the output side.
• After wiring, wire offcuts must not be left in the inverter.
Wire offcuts can cause an alarm, failure or malfunction. Always keep the inverter clean.
When drilling mounting holes in an enclosure etc., take caution not to allow chips and other foreign matter to enter the
inverter.
• Set the voltage/current input switch correctly. Incorrect setting may cause a fault, failure or malfunction.
• For the parameter details, refer to the Instruction Manual (Detailed).

30 INSTALLATION AND WIRING

 Terminal connection diagrams

FM type (Ethernet model)

DC reactor
(FR-HEL)∗1
Sink logic
Main circuit terminal
Control circuit terminal
Earth
(Ground)
P1 P/+ N/-
MCCB MC
R/L1
Three-phase
S/L2 Inrush current
AC power
T/L3 limit circuit U
supply
V Motor
R1/L11 ON EMC filter M
Jumper W
∗2 S1/L21 ON/OFF
OFF connecter Earth (Ground)
Earth
(Ground) Main circuit
Control input signals Control circuit Relay output∗7
(No voltage input allowed)∗3
STF C1
Forward rotation start
STR B1
Reverse rotation start Relay output 1
A1 (Fault output)
STP(STOP)
Start self-holding selection
RH C2
High speed
RM B2
Multi-speed Middle speed Relay output 2
selection A2
RL
Low speed
JOG ∗4 RUN Open collector output∗8
Jog operation Running
RT SU
Second function selection Up to frequency
MRS IPF
Output stop Instantaneous
RES OL power failure
Reset Overload
Terminal 4 input selection AU FU
Frequency detection
SOURCE

(Current input selection)

Selection of automatic restart CS SE
SINK

Open collector output common

after instantaneous
power failure Sink/source common
SD
Contact input common 24V

24VDC power supply PC

(Common for external power supply transistor)
24V external power +24 PU
supply input
SD connector
Common terminal ∗5 Voltage/current
input switch
Frequency setting signals (Analog) 10E(+10V) ON F/C + - Indicator
OFF USB A (FM) (Frequency meter, etc.)
10(+5V) 2 4 connector ∗9
3 Calibration Moving-coil type
Frequency setting DC0 to 5V Initial value
2 SD resistor ∗10 1mA full-scale
potentiometer 2 DC0 to 10V selectable
∗5 USB
1/2W1kΩ∗6 DC0 to 20mA
1 5 mini B
(Analog common) AM (+)
connector Analog signal output
5 (0 to ±10VDC)
DC0 to ±10V Initial value (-)
Auxiliary (+) 1 DC0 to ±5V selectable Ethernet
(-) ∗5
input connector
DC4 to 20mA Initial value ∗11
Terminal 4 input (+)
2
4 DC0 to 5V selectable ∗5
(Current input) (-) DC0 to 10V
Connector for plug-in option connection Connector 1 Connector 2
∗11
Connector 3

Safety stop signal Shorting 24V

wire PC
S1
Safety stop input (Channel 1)
S2 Output shutoff So (SO)
Safety stop input (Channel 2) Safety monitor output
circuit
SIC
Safety stop input common SOC
SD Safety monitor output common

INSTALLATION AND WIRING 31

Terminal connection diagrams
 Always connect a DC reactor (FR-HEL), which is available as an option. (To select a DC reactor, refer to page 106, and select one according to
the applicable motor capacity.)
 When using separate power supply for the control circuit, remove the jumper between R1/L11 and S1/L21.
 The function of these terminals can be changed with the input terminal assignment (Pr.178 to Pr.189).
 Terminal JOG is also used as a pulse train input terminal. Use Pr.291 to choose JOG or pulse.
 Terminal input specifications can be changed by analog input specification switchover (Pr.73, Pr.267). To input a voltage, set the voltage/current
input switch OFF. To input a current, set the voltage/current input switch ON. Terminals 10 and 2 are also used as a PTC input terminal. (Pr.561)
 It is recommended to use 2 W 1 k when the frequency setting signal is changed frequently.
 The function of these terminals can be changed with the output terminal assignment (Pr.195, Pr.196).
 The function of these terminals can be changed with the output terminal assignment (Pr.190 to Pr.194).
 The terminal FM can be used to output pulse trains as open collector output by setting Pr.291.
 Not required when calibrating the scale with the operation panel.
 The option connector 2 cannot be used because the Ethernet board is installed in the initial status. The Ethernet board must be removed to
install a plug-in option to the option connector 2. (However, Ethernet communication is disabled in that case.)

NOTE
• To prevent a malfunction due to noise, keep the signal cables 10 cm or more away from the power cables. Also, separate the
main circuit cables at the input side from the main circuit cables at the output side.
• After wiring, wire offcuts must not be left in the inverter.
Wire offcuts can cause an alarm, failure or malfunction. Always keep the inverter clean.
When drilling mounting holes in an enclosure etc., take caution not to allow chips and other foreign matter to enter the
inverter.
• Set the voltage/current input switch correctly. Incorrect setting may cause a fault, failure or malfunction.
• For the parameter details, refer to the Instruction Manual (Detailed).

32 INSTALLATION AND WIRING

 Terminal connection diagrams

CA type (Ethernet model)

DC reactor
(FR-HEL)∗1
Source logic
Main circuit terminal
Control circuit terminal
Earth
(Ground)
P1 P/+ N/-
MCCB MC
R/L1
Three-phase
S/L2 Inrush current
AC power
T/L3 limit circuit
supply U
R1/L11 ON V Motor
Jumper EMC filter M
∗2 S1/L21 ON/OFF W
OFF connecter
Earth Earth (Ground)
(Ground) Main circuit
Control input signals Control circuit Relay output∗7
(No voltage input allowed)∗3
STF C1
Forward rotation start
STR B1
Reverse rotation start Relay output 1
A1 (Fault output)
STP(STOP)
Start self-holding selection
RH C2
High speed
RM B2
Multi-speed Middle speed Relay output 2
selection A2
RL
Low speed
JOG ∗4 RUN Open collector output∗8
Jog operation Running
RT SU
Second function selection Up to frequency
MRS IPF
Output stop Instantaneous
RES OL power failure
Reset Overload
Terminal 4 input selection AU FU
Frequency detection
SOURCE

(Current input selection)

Selection of automatic restart CS SE
SINK

Open collector output common

after instantaneous power failure Sink/source common
Common for external power SD
24V
supply transistor
Contact input common PC
24VDC power supply

24V external power +24

supply input PU
Common terminal
SD ∗5 Voltage/current connector
input switch
F/C
Frequency setting signals (Analog) 10E(+10V) ON (+)
(CA) Analog current output
OFF USB A
10(+5V) 2 4 connector (-) (0 to 20mADC)
3
Frequency setting 2 DC0 to 5V Initial value
potentiometer 2 DC0 to 10V selectable
∗5 USB AM (+)
1/2W1kΩ∗6 DC0 to 20mA Analog signal output
1 5 mini B
(Analog common) (DC0 to ±10V)
connector (-)
5
DC0 to ±10V Initial value
Auxiliary (+) 1 DC0 to ±5V selectable Ethernet
(-) ∗5
input connector
∗9

2
DC4 to 20mA Initial value
Terminal 4 input (+) 4 DC0 to 5V selectable ∗5
(Current input) (-) DC0 to 10V
Connector for plug-in option connection Connector 1 Connector 2
∗9
Connector 3

Safety stop signal Shorting 24V

wire PC

Safety stop input (Channel 1) S1

S2 Output shutoff
Safety stop input (Channel 2) So (SO)
circuit Safety monitor output
SIC
Safety stop input common SOC
SD Safety monitor output common

INSTALLATION AND WIRING 33

Terminal connection diagrams
 Always connect a DC reactor (FR-HEL), which is available as an option. (To select a DC reactor, refer to page 106, and select one according to
the applicable motor capacity.)
 When using separate power supply for the control circuit, remove the jumper between R1/L11 and S1/L21.
 The function of these terminals can be changed with the input terminal assignment (Pr.178 to Pr.189).
 Terminal JOG is also used as a pulse train input terminal. Use Pr.291 to choose JOG or pulse.
 Terminal input specifications can be changed by analog input specification switchover (Pr.73, Pr.267). To input a voltage, set the voltage/current
input switch OFF. To input a current, set the voltage/current input switch ON. Terminals 10 and 2 are also used as a PTC input terminal. (Pr.561)
 It is recommended to use 2 W 1 k when the frequency setting signal is changed frequently.
 The function of these terminals can be changed with the output terminal assignment (Pr.195, Pr.196).
 The function of these terminals can be changed with the output terminal assignment (Pr.190 to Pr.194).
 The option connector 2 cannot be used because the Ethernet board is installed in the initial status. The Ethernet board must be removed to
install a plug-in option to the option connector 2. (However, Ethernet communication is disabled in that case.)

NOTE
• To prevent a malfunction due to noise, keep the signal cables 10 cm or more away from the power cables. Also, separate the
main circuit cables at the input side from the main circuit cables at the output side.
• After wiring, wire offcuts must not be left in the inverter.
Wire offcuts can cause an alarm, failure or malfunction. Always keep the inverter clean.
When drilling mounting holes in an enclosure etc., take caution not to allow chips and other foreign matter to enter the
inverter.
• Set the voltage/current input switch correctly. Incorrect setting may cause a fault, failure or malfunction.
• For the parameter details, refer to the Instruction Manual (Detailed).

34 INSTALLATION AND WIRING

 Main circuit terminals / piping port

2.5 Main circuit terminals / piping port

2.5.1 Descriptions of the main circuit terminals /

piping ports
Terminal/
Refer to
port Terminal/port name Terminal/port function description
page
symbol
R/L1, Connect these terminals to the commercial power supply.
S/L2, AC power input Do not connect anything to these terminals when using the high power —
T/L3 factor converter (FR-HC2).
Connect these terminals to a three-phase squirrel cage motor or a PM
U, V, W Inverter output —
motor.
Connected to the AC power supply terminals R/L1 and S/L2. To retain the
fault display and fault output, remove the jumpers across terminals R/L1
R1/L11, Power supply for the control and R1/L11 and across S/L2 and S1/L21, and supply external power to
55
S1/L21 circuit these terminals.
The power capacity necessary when separate power is supplied from R1/
L11 and S1/L21 is 80 VA.
P/+, P1 DC reactor connection Always connect a DC reactor, which is available as an option. 73
N/- Keep this open.
For earthing (grounding) the inverter chassis. This must be earthed
Earth (ground) 39
(grounded).
LI, LO Cooling system connection Connect the cooling system. 36
D Drainage pipe connection Connect the drainage pipe. 36

INSTALLATION AND WIRING 35

Main circuit terminals / piping port

2.5.2 Terminal layout of the main circuit terminals

and wiring of power supply / motor
FR-A840-03250(110K) to FR-A840-04810(185K)-LC FR-A840-05470(220K) to FR-A840-06830(280K)-LC
Charge lamp

Jumper
Charge lamp

Jumper

R/L1 S/L2 T/L3 N/- P/+

S/L2 N/-
R/L1 T/L3

P/+
M M
Power supply Motor
Power supply DC reactor Motor DC reactor

NOTE
• Make sure the power cables are connected to the R/L1, S/L2, and T/L3. (Phase need not be matched.) Never connect the
power cable to the U, V, and W of the inverter. Doing so will damage the inverter.
• Connect the motor to U, V, and W. The phase need to be matched.
• When wiring the inverter main circuit conductor, tighten a nut from the right side of the
conductor. When wiring two wires, place wires on both sides of the conductor. (Refer to
the drawing on the right.) For wiring, use bolts (nuts) provided with the inverter.

2.5.3 Piping the cooling system and the drainage pipe

FR-A840-03250(110K) to FR-A840-04810(185K)-LC FR-A840-05470(220K) to FR-A840-06830(280K)-LC

Drainage port Drainage port

Cooling system Cooling system

36 INSTALLATION AND WIRING

 Main circuit terminals / piping port

2.5.4 Applicable cables and the wiring length

Select a recommended cable size to ensure that the voltage drop will be 2% or less.
If the wiring distance is long between the inverter and motor, the voltage drop in the main circuit wires will cause the motor
torque to decrease especially at a low speed.
The following table indicates a selection example for the wiring length of 20 m.

• 400 V class (440 V input power supply (with 150% rated current for one minute))

Crimp Cable gauge

Applicable Terminal Tightening terminal MLFC cables, etc. (mm2) AWG/MCM PVC cables, etc. (mm2)
inverter model screw torque R/L1, R/L1, Earthing R/L1, R/L1, Earthing
FR-A840-[ ]-LC size N·m U, V, P/+, U, V, U, V,
S/L2, U, V, W S/L2, (grounding) S/L2, S/L2, (grounding)
W P1 W W
T/L3 T/L3 cable T/L3 T/L3 cable
03250(110K) M10 26.5 80-10 80-10 80 80 80 38 3/0 3/0 70 70 35
03610(132K) M10 26.5 100-10 100-10 100 100 100 38 4/0 4/0 95 95 50
04320(160K) M12(M10) 46 150-12 150-12 125 150 150 38 250 250 120 120 70
04810(185K) M12(M10) 46 150-12 150-12 150 150 150 38 300 300 150 150 95
05470(220K) M12(M10) 46 100-12 100-12 2×100 2×100 2×100 60 2×4/0 2×4/0 2×95 2×95 95
06100(250K) M12(M10) 46 100-12 100-12 2×100 2×100 2×100 60 2×4/0 2×4/0 2×95 2×95 95
06830(280K) M12(M10) 46 150-12 150-12 2×125 2×125 2×125 60 2×250 2×250 2×120 2×120 125
 It is the gauge of the cable with the continuous maximum permissible temperature of 90°C or higher. (LMFC (heat resistant flexible cross-linked
polyethylene insulated cable), etc.). It assumes a surrounding air temperature of 50°C or lower and in-enclosure wiring.
 It is the gauge of a cable with the continuous maximum permissible temperature of 90°C (THHN cable). It assumes a surrounding air
temperature of 40°C or lower and in-enclosure wiring. (For the use in the United States or Canada, refer to page 115.)
 It is the gauge of a cable with the continuous maximum permissible temperature of 90°C (XLPE cable). It assumes a surrounding air
temperature of 40°C or lower and in-enclosure wiring. (Selection example for use mainly in Europe.)
 The terminal screw size indicates the size of terminal screw for R/L1, S/L2, T/L3, U, V, W, P/+, N/-, and P1.
The size of earthing (grounding) screws for the FR-A840-04320(160K) or higher is indicated in parentheses.

The line voltage drop can be calculated by the following formula:

× wire resistance [mΩ/m] × wiring distance [m] × current [A]

Line voltage drop [V]=
1000
Use a larger diameter cable when the wiring distance is long or when it is desired to decrease the voltage drop (torque
reduction) in the low speed range.

NOTE
• The selection example is for the ND or LD rating.
• Tighten the terminal screw to the specified torque.
A screw that has been tightened too loosely can cause a short circuit or malfunction.
A screw that has been tightened too tightly can cause a short circuit or malfunction due to the unit breakage.
• Use crimp terminals with insulation sleeves to wire the power supply and motor.

INSTALLATION AND WIRING 37

Main circuit terminals / piping port

Total wiring length

 With induction motor
Connect one or more induction motors within the total wiring length 500 m. (The wiring length should be 100 m or shorter
under vector control.)

Total wiring length

300 m

500 m or less 300 m

300 m + 300 m = 600 m

When driving a 400 V class motor by the inverter, surge voltages attributable to the wiring constants may occur at the
motor terminals, deteriorating the insulation of the motor. In this case, take one of the following measures.
• Use a "400 V class inverter-driven insulation-enhanced motor". When the wiring length exceeds 100 m, set "4" (4 kHz)
or less in Pr.72 PWM frequency selection.
• Connect a sine wave filter (MT-BSL/BSC) at the output side of the inverter.

 With PM motor
The wiring length should be 100 m or shorter when connecting a PM motor.
Use one PM motor for one inverter. Multiple PM motors cannot be connected to an inverter.
When the wiring length exceeds 50 m for the motor driven by an inverter under PM sensorless vector control, set "9" (6
kHz) or less in Pr.72 PWM frequency selection.

NOTE
• Especially for long-distance wiring, the inverter may be affected by a charging current caused by stray capacitances of the
wiring, leading to an activation of the overcurrent protection, malfunction of the fast-response current limit operation, or even
to an inverter failure. It may also cause a malfunction or fault of the equipment connected ON the inverter output side. If the
fast-response current limit function malfunctions, disable this function. (Pr.156 Stall prevention operation selection, refer to
the Instruction Manual (Detailed).)
• A surge voltage suppression filter (FR-BMF-H) can be used under V/F control and Advanced magnetic flux vector control. A
sine wave filter (MT-BSL/BSC) can be used under V/F control. Do not use the filters under different control methods.
• For the details of Pr.72 PWM frequency selection, refer to the Instruction Manual (Detailed).
• Refer to page 82 to drive a 400 V class motor by an inverter.
• The carrier frequency is limited during PM sensorless vector control. (Refer to the Instruction Manual (Detailed).)

38 INSTALLATION AND WIRING

 Main circuit terminals / piping port

2.5.5 Earthing (grounding) precautions

• Always earth (ground) the motor and inverter.

Purpose of earthing (grounding)

Generally, an electrical apparatus has an earth (ground) terminal, which must be connected to the ground before use.
An electrical circuit is usually insulated by an insulating material and encased. However, it is impossible to manufacture an
insulating material that can shut off a leakage current completely, and actually, a slight current flows into the case. The
purpose of earthing (grounding) the case of an electrical apparatus is to prevent operators from getting an electric shock from
this leakage current when touching it.
To avoid the influence of external noises, this earthing (grounding) is important to EMI-sensitive equipment that handle low-
level signals or operate very fast such as audio equipment, sensors, computers.

Earthing (grounding) system to be established

As described previously, earthing (grounding) is roughly classified into an electrical shock prevention and the prevention of
malfunction due to the influence of electromagnetic noise. These two purposes should be clearly distinguished, and the
appropriate earth (ground) system must be established to prevent the leakage current having the inverter's high frequency
components from reversing through another earth (ground) point for malfunction prevention by following these instructions:
• Make the separate earth (ground) connection (I) for high frequency products such as the inverter from any other devices
(EMI-sensitive devices described above) wherever possible.
Establishing adequate common (single-point) earth (ground) system (II) shown in the following figure is allowed only in
cases where the separate earth (ground) system (I) is not feasible. Do not make inadequate common (single-point) earth
(ground) connection (III)
As leakage current containing many high frequency components flows into the earthing (grounding) cables of the inverter
and peripheral devices. Because of this, the inverter must be earthed (grounded) separately from EMI-sensitive devices.
In a high building, it may be effective to use its iron structure frames as earthing (grounding) electrode for EMI prevention in
order to separate from the earth (ground) system for electric shock prevention.
• Earthing (Grounding) must conform to the requirements of national and local safety regulations and electrical codes. (NEC
section 250, IEC 61140 class 1 and other applicable standards).
• Use the thickest possible earthing (grounding) cable. The earthing (grounding) cable should be equal to the size indicated
in the table on page 37.
• The earthing (grounding) point should be as close as possible to the inverter, and the earth (ground) wire length should be
as short as possible.
• Run the earthing (grounding) cable as far away as possible from the I/O wiring of the EMI-sensitive devices and run them in
parallel in the minimum distance.

High frequency High frequency EMI-sensitive High frequency

EMI-sensitive EMI-sensitive
products products devices products
devices devices
(inverter, etc.) (inverter, etc.) (inverter, etc.)

2
(I) Separate earthing (grounding): Good (II) Common (single-point) earthing (grounding): OK (III) Inadequate common (single-point) earthing (grounding): Bad

NOTE
• To be compliant with the EU Directive (Low Voltage Directive), refer to page 112.

INSTALLATION AND WIRING 39

Main circuit terminals / piping port

2.5.6 Piping and coolant for the cooling system and

the drainage pipe
Piping connection
Connection port Recommended pipes
Port type Material Port symbol Material Size
Main material (inner layer): ETFE (Tetrafluoride
based fluorine resin) Inside diameter: 12 mm,
Brass (Tetrafluoroethylene and ethylene copolymer) outside diameter: 18 mm
Piping port LI, LO
(C3604BD) Reinforcement: Polyester yarn
Inside diameter: 10.7 mm,
Phosphorus deoxidized copper (C1220)
outside diameter: 12.7 mm
Carbon steel Main material: Soft PVC Inside diameter: 12 mm,
Drainage port D
(SGP) Reinforcement: Polyester yarn outside diameter: 18 mm
 For piping, fix each pipe securely with a binder to prevent fluid leakage.

• Before piping, remove a protective cap from each port.

• For piping, use sealing tape around each pipe joint to prevent fluid leakage. For connecting the joint, make sure to fix the
section (a) shown in the figure. Do not fix the section (b). When the section (b) is fixed for connecting the joint, water
leakage may occur.

FR-A840-03250(110K) to 04810(185K) FR-A840-05470(220K) to 06830(280K)

(b)
(b)
(a)
(a)

Recommended
Screw type Pipe diameter
tightening torque
Piping port 3/8R 23 N·m ―
Drainage port — ― Outside diameter: 10.5 mm
• Do not splash water on the port symbol (LI/LO/D) stickers during piping. Wet stickers may come unstuck. Wipe the stickers
dry immediately if they get wet.
• Refer to the inverter installation environment (page 19) to connect the cooling system appropriately so that the flow rate,
temperature, and pressure of the coolant will be kept within the specified range.
• Attach a flow meter or a flow switch at the inlet of coolant to monitor the flow rate. When the inverter is operated
continuously with the flow rate less than the specified rate, impurities or other deposits may deposit. When the flow rate
exceeds the specified rate, corrosion of internal piping may proceed more rapidly.
• Place thermometers at the inlet and the outlet of coolant to monitor the fluid temperature. When the temperature exceeds
the specified temperature, corrosion of internal piping may proceed more rapidly.
• Place a pressure gauge at the outlet of coolant to monitor the pressure. When the applied pressure exceeds the specified
pressure, water may leak out from the joint section or the pipes may be broken.
• Place valves at the inlet and the outlet of coolant in the piping. Use the valves for flow rate regulation during installation or
replacement.
• Do not permit residual air in the pipes for piping joint.

Inverter
Cooling system
LI LO

Thermo
meter 2 Pressure gauge
D
TI PI
Valve 2

Drainage port Coolant outlet

Thermo
meter 1 Flow meter
TI FI
Valve 1

Coolant inlet

40 INSTALLATION AND WIRING

 Main circuit terminals / piping port

Selection of the coolant

For corrosion prevention of the internal piping, use a coolant with the specifications in the following table.
Even if the values meet the specifications, also check that the value of bicarbonate ion exceeds the value of sulphate ion.
(When using running water, check the contents of water against the specifications.)
Item Circulating water Supply water
PH 7.0 to 8.0 7.0 to 8.0
Electrical conductivity 30 mS/m or less 30 mS/m or less
Chloride ion 50 mg/L or less 50 mg/L or less
Sulphate ion 50 mg/L or less 50 mg/L or less
Acid consumption 50 mg/L or less 50 mg/L or less
Total hardness 70 mg/L or less 70 mg/L or less
Calcium hardness 50 mg/L or less 50 mg/L or less
Ionic silica 30 mg/L or less 30 mg/L or less
Iron 1.0 mg/L or less 0.3 mg/L or less
Copper 1.0 mg/L or less 0.1 mg/L or less
Sulfide ion Should not be detected Should not be detected
Ammonium ion 0.3 mg/L 0.1 mg/L
Residual chlorine 0.25 mg/L or less 0.3 mg/L or less
Free carbon dioxide 0.4 mg/L or less 4.0 mg/L or less

NOTE
• Copper (C1220) is used for the inverter internal piping. Select an appropriate cooling system and a coolant to prevent corrosion.

Coolant temperature
The lowest temperature of the coolant differs depending on the surrounding air temperature and relative humidity of the
inverter as shown in the following table.
Surrounding air Relative humidity (RH) (%)
temperature (°C) 95 90 80 70 60 50 40 30 20 10
50 Not applicable 38°C 33°C 29°C 22°C 13°C
45 Not applicable 39°C 36°C 33°C 29°C 24°C 18°C 9°C
40 40°C 39°C 37°C 34°C 32°C 28°C 25°C 20°C 14°C 5°C
35 35°C 34°C 32°C 30°C 27°C 24°C 20°C 16°C 10°C 1°C
30 30°C 29°C 27°C 25°C 22°C 19°C 16°C 11°C 6°C 1°C
25 25°C 24°C 22°C 20°C 18°C 15°C 11°C 7°C 2°C 1°C
20 20°C 19°C 17°C 15°C 13°C 10°C 7°C 3°C 1°C 1°C
15 15°C 14°C 12°C 10°C 8°C 6°C 2°C 1°C 1°C 1°C
10 10°C 9°C 8°C 6°C 3°C 1°C 1°C 1°C 1°C 1°C
5 5°C 4°C 3°C 1°C 1°C 1°C 1°C 1°C 1°C 1°C
0 1°C 1°C 1°C 1°C 1°C 1°C 1°C 1°C 1°C 1°C
When the coolant temperature becomes lower than the temperature specified in the table, condensation may occur inside the
inverter and the inverter may be damaged. When condensation occurs, take the following countermeasures.
• When the coolant temperature is higher than the surrounding air temperature, let the coolant circulate.
• When the coolant temperature is lower than the surrounding air temperature, do not let the coolant circulate while the
inverter is stopped.
• Install a dehumidifier or other appropriate device inside the enclosure of the inverter.

INSTALLATION AND WIRING 41

Main circuit terminals / piping port

Amount of heat generated by the inverter

The following table shows the amount of heat generated in the liquid cooling and the air cooling sections of the inverter not
connected with the cooling system. (The amount of heat generated shown assumes the following conditions: output current of
the inverter rated current, power supply voltage of 440 V (400 V class), and carrier frequency of 2 kHz. The amount of heat
shown is that generated from the inverter alone (not including that generated from the DC reactor).
Select the cooling system considering the following amount of heat.
03250 03610 04320 04810 05470 06100 06830
Model FR-A840-[]-LC
110K 132K 160K 185K 220K 250K 280K
ND rating 2300 2800 3450 3850 4500 5050 5850
Total amount of heat
LD rating 2800 3600 3800 4650 5050 5850 6600
Amount of heat in liquid ND rating 2070 2550 3150 3530 4110 4640 5420
cooling section LD rating 2550 3320 3480 4300 4640 5420 6090
Amount of heat in air ND rating 230 250 300 320 390 410 430
cooling section LD rating 250 280 320 350 410 430 510
(Unit: W)

Function specifications
(1) Low flow rate input warning
The warning is displayed according to the status of the signal input to the inverter input terminal from the flow switch attached
at the inlet of coolant.

Input
Name Description Remarks
signal
Set "31" in any of Pr.178 to Pr.189 to enable the
Signal status according to the flow rate. function.
X31 Flow switch input 1 Low flow rate: ON (conductive) When multiple flow switches are used and any of
High flow rate: OFF (not conductive) the switches outputs the X31 signal, the Y216
signal is output.
Set "41" in any of Pr.178 to Pr.189 to enable the
Signal status according to the flow rate. function.
X41 Flow switch input 2 Low flow rate: OFF (not conductive) When multiple flow switches are used and any of
High flow rate: ON (conductive) the switches stops outputting the X41 signal, the
Y216 signal is output.

Output
Name Description Remarks
signal
Set "216 (positive logic) or 316 (negative logic)"
Low flow rate input Low flow rate: ON
Y216 in any of Pr.190 to Pr.196 to output the Y216
warning High flow rate: OFF
signal.

• Warning output operation

Flow rate condition

Warning (output signal) status FR-DU08 display
(input signal)
Low ON The "FL" warning is displayed.
High OFF The warning is OFF.

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 Main circuit terminals / piping port

[Example] Warning output when the incoming coolant flow rate becomes low
• When a single flow switch is used and the X31 signal or the X41 signal is used for the switch, the status of the signals is as
follows.
The Y216 signal turns ON when the X31 signal turns ON.
The Y216 signal turns ON when the X41 signal turns OFF.

High

Flow switch setting level

[Coolant flow]

Low

X31 ON ON
(Flow switch output)

X41
ON ON
(Flow switch output)

Warning
ON ON
(Y216)

• When multiple flow switches are used and the X31 signal or the X41 signal is used for each of the switches, the status of
the signals is as follows.
When any of the X31 signals is ON or any of the X41 signals is OFF, the Y216 signal is ON.

X31 (flow switch A)

ON ON

X41 (flow switch A)

ON ON
X31 (flow switch B)

X41 (flow switch B)

Warning (Y216)
(The OR condition applies to
ON ON ON
the flow switches A and B.)

INSTALLATION AND WIRING 43

Main circuit terminals / piping port

[Example of advanced application] Warning output when the incoming coolant flow rate is beyond the upper/lower limit
• In this example, the upper and lower limits are placed on the coolant flow rate. The X31 signal turns ON when the flow rate
becomes lower than the lower limit at the flow switch A, and the X31 signal is set to turn ON when the flow rate becomes
higher than the upper limit at the flow switch B. The Y216 signal turns ON when the flow rate exceeds or falls below the
limits. The status of the signals is as follows.
The Y216 signal turns ON when the X31 signal for the flow switch A turns ON (the flow rate falls below the lower limit).
The Y216 signal turns ON when the X31 signal for the flow switch B turns ON (the flow rate exceeds the upper limit).

High

Upper limit
[Coolant flow]
Lower limit

Low
ON ON
X31 (flow switch B)

X31 (flow switch A)

ON OFF

Warning
(Y216)
ON OFF ON OFF ON

NOTE
• The output signal Y216 is retained after inverter reset.
• When multiple input signals are used, the operation is as follows.
- Multiple X31 signals: When any of the terminals turns ON, the warning is output.
- Multiple X41 signals: When any of the terminals turns OFF, the warning is output.
- X31 and X41 signals: When any of the X31 signals is ON or any of the X41 signals is OFF, the Y216 signal is ON and the
warning is output.
(2) Multiple rating setting
Two rating types of different rated current and permissible load can be selected. For the parameter initial values and setting
ranges changed after the multiple rating setting, refer to the Instruction Manual (Detailed) of the FR-A800 inverter.

Pr. Name Initial value Setting range Description

570 1 LD rating
Multiple rating setting 2
(E301) 2 ND rating

44 INSTALLATION AND WIRING

 Main circuit terminals / piping port

Addition/change of fault indication

• Warning

Operation panel
FL
indication
Name Low flow rate input warning
The warning is displayed according to the status of the signal input to the inverter input terminal from the flow
Description
switch attached at the inlet of coolant.
Check if the flow rate decreases.
Check point
Check for malfunction of the flow switch.
• Keep the flow rate within the rated flow rate range.
Corrective action
• Check the flow switch operation.

• Fault

Operation panel
E.IPF
indication
Name Instantaneous power failure
If a power failure (inverter input shut-off) occurs and lasts for longer than 10 ms, the instantaneous power
failure protective function is activated to trip the inverter in order to prevent the control circuit from
malfunctioning. If a power failure persists for 100 ms or longer, the fault output is not provided, and the
inverter restarts if the start signal is ON upon power restoration. (The inverter continues operating if an
Description
instantaneous power failure is within 10 ms.) In some operating status (depending on the load magnitude,
acceleration/deceleration time setting, etc.), overcurrent or other protection may be activated upon power
restoration.
When instantaneous power failure protection is activated, the IPF signal is output.
Check point Find the cause of the instantaneous power failure occurrence.
• Recover from the instantaneous power failure condition.
Corrective action • Prepare a backup power supply in case of an instantaneous power failure.
• Set the function of automatic restart after instantaneous power failure (Pr.57).

Operation panel
E.IAH
indication
Name Abnormal internal temperature
If the operation continues for 15 minutes or more while the fan alarm is output (while the indication "FN"
Description
appears), the inverter trips.
Check point Check if the cooling fan stops due to a fault.
Corrective action Replace the cooling fan.

INSTALLATION AND WIRING 45

Control circuit

2.6 Control circuit

2.6.1 Details on the control circuit terminals

Input signal function of the terminals in can be selected by setting Pr.178 to Pr.196 (I/O terminal function selection).
For the parameter details, refer to the Instruction Manual (Detailed).

Input signal
Terminal
Type

Terminal name Terminal function description Rated specification

symbol
When the STF and
Turn ON the STF signal to start forward
STF Forward rotation start STR signals are
rotation and turn it OFF to stop.
turned ON
simultaneously, the Input resistance: 4.7 k
Turn ON the STR signal to start reverse
STR Reverse rotation start stop command is Voltage when contacts
rotation and turn it OFF to stop.
given. are open: 21 to 27 VDC
STP Start self-holding Current when contacts
Turn ON the STP (STOP) signal to self-hold the start signal.
(STOP) selection are short-circuited:
RH, RM, Multi-speed can be selected according to the combination of RH, RM 4 to 6 mADC
Multi-speed selection
RL and RL signals.
Turn ON the JOG signal to enable JOG operation (initial setting) and
Jog mode selection
turn ON the start signal (STF or STR) to start JOG operation.

JOG Input resistance: 2 k

Terminal JOG is also used as a pulse train input terminal. To use as a
Current when contacts
Pulse train input pulse train input terminal, change the Pr.291 setting. (maximum input
are short-circuited:
pulse: 100k pulses/s)
8 to 13 mADC
Turn ON the RT signal to enable the second function.
Second function When the second function such as "second torque boost" and "second
RT
selection V/F (base frequency)" is set, turning ON the RT signal enables the
selected function.
Turn ON the MRS signal (20 ms or more) to stop the inverter output.
MRS Output stop Use this signal to shut off the inverter output when stopping the motor
with an electromagnetic brake.
Use this signal to reset a fault output provided when a protective Input resistance: 4.7 k
Contact input

function is activated. Turn ON the RES signal for 0.1 s or longer, then Voltage when contacts
turn it OFF. are open: 21 to 27 VDC
RES Reset
In the initial setting, reset is set always-enabled. By setting Pr.75, Current when contacts
reset can be set enabled only at fault occurrence. The inverter are short-circuited:
recovers about 1 s after the reset is released. 4 to 6 mADC
The terminal 4 function is available only when the AU signal is turned
Terminal 4 input
AU ON.
selection
Turning the AU signal ON makes terminal 2 invalid.
Selection of
When the CS signal is left ON, the inverter restarts automatically at
automatic restart
CS power restoration. Note that restart setting is necessary for this
after instantaneous
operation. In the initial setting, a restart is disabled.
power failure
Contact input Common terminal for the contact input terminal (sink logic), terminal
common (sink) FM.
Connect this terminal to the power supply common terminal of a
External transistor transistor output (open collector output) device, such as a
SD common (source) programmable controller, in the source logic to avoid malfunction by —
undesirable current.
Common terminal for the 24 VDC power supply (terminal PC, terminal
24 VDC power supply
+24)
common
Isolated from terminals 5 and SE.
Connect this terminal to the power supply common terminal of a
External transistor transistor output (open collector output) device, such as a
common (sink) programmable controller, in the sink logic to avoid malfunction by Power supply voltage
undesirable currents. range: 19.2 to 28.8 VDC
PC
Permissible load
Contact input
Common terminal for contact input terminal (source logic). current: 100 mA
common (source)
24 VDC power supply Can be used as a 24 VDC 0.1 A power supply.

46 INSTALLATION AND WIRING

 Control circuit

Terminal
Type

Terminal name Terminal function description Rated specification

symbol
10 VDC 0.4 V
10E When connecting the frequency setting potentiometer at an initial Permissible load
Frequency setting status, connect it to terminal 10. current: 10 mA
power supply Change the input specifications of terminal 2 using Pr.73 when 5 VDC 0.5 V
10 connecting it to terminal 10E. Permissible load
current: 10 mA
Inputting 0 to 5 VDC (or 0 to 10 V, 0 to 20 mA) provides the maximum For voltage input, input
output frequency at 5 V (10 V, 20 mA) and makes input and output resistance: 101 k,
Frequency setting
2 proportional. Use Pr.73 to switch among input 0 to 5 VDC (initial maximum permissible
(voltage)
setting), 0 to 10 VDC, and 0 to 20 mA. Set the voltage/current input voltage: 20 VDC.
Frequency setting

switch in the ON position to select current input (0 to 20 mA). For current input, input
resistance: 245 5 ,
Inputting 4 to 20 mADC (or 0 to 5 V, 0 to 10 V) provides the maximum permissible maximum
output frequency at 20 mA and makes input and output proportional. current: 30 mA.
This input signal is valid only when the AU signal is ON (terminal 2 input
Frequency setting Voltage/current
4 is invalid). Use Pr.267 to switch among input 4 to 20 mA (initial setting),
(current) input switch
0 to 5 VDC, and 0 to 10 VDC. Set the voltage/current input switch in the switch2
OFF position to select voltage input (0 to 5 V / 0 to 10 V). switch1
Use Pr.858 to switch terminal functions. 2 4

Inputting 0 to ±5 VDC or 0 to ±10 VDC adds this signal to terminal 2 or Input resistance: 10 1
Frequency setting 4 frequency setting signal. Use Pr.73 to switch between input 0 to ±5 k
1
auxiliary VDC and 0 to ±10 VDC (initial setting). Use Pr.868 to switch terminal Permissible maximum
functions. voltage: 20 VDC
Frequency setting Common terminal for frequency setting signal (terminal 2, 1 or 4) and
5 —
common analog output terminal AM, CA. Do not earth (ground).
Applicable PTC
thermistor specification
Thermistor

For receiving PTC thermistor outputs.

10 Overheat detection
PTC thermistor input When PTC thermistor is valid (Pr.561  "9999"), terminal 2 is not
2 resistance:
available for frequency setting.
0.5 to 30 k
(Set by Pr.561)
External power
supply input

Input voltage:
For connecting a 24 V external power supply.
24 V external power 23 to 25.5 VDC
+24 If a 24 V external power supply is connected, power is supplied to the
supply input Input current: 1.4 A or
control circuit while the main power circuit is OFF.
less

 Set Pr.73, Pr.267, and the voltage/current input switch correctly, then input an analog signal in accordance with the setting.
Applying a voltage with the voltage/current input switch ON (current input is selected) or a current with the switch OFF (voltage input is selected)
could cause component damage of the inverter or analog circuits of output devices. (For the details, refer to the Instruction Manual (Detailed).)
 Sink logic is initially set for the FM-type inverter.
 Source logic is initially set for the CA-type inverter.

INSTALLATION AND WIRING 47

Control circuit

Output signal
Terminal
Type

Terminal name Terminal function description Rated specification

symbol
1 changeover contact output that indicates that an inverter's
A1,
Relay output 1 (fault protective function has been activated and the outputs are stopped.
B1, Contact capacity: 230
output) Fault: discontinuity across B and C (continuity across A and C),
C1
Relay

VAC 0.3 A (power factor

Normal: continuity across Band C (discontinuity across A and C)
= 0.4)
A2,
30 VDC 0.3 A
B2, Relay output 2 1 changeover contact output
C2
Switched to LOW when the inverter output frequency is equal to or
RUN Inverter running higher than the starting frequency (initial value 0.5 Hz). Switched to
HIGH during stop or DC injection brake operation.
Switched to LOW when the output frequency Permissible load: 24
is within the set frequency range 10% (initial VDC (maximum 27
SU Up to frequency VDC) 0.1 A
value). Switched to HIGH during acceleration/
deceleration and at a stop. (The voltage drop is 2.8
V at maximum while the
Switched to LOW when stall prevention is
signal is ON.)
Open collector

activated by the stall prevention function.

OL Overload warning The open collector
Switched to HIGH when stall prevention is
Fault code (4 bits) transistor is ON
canceled.
output. (conductive) in LOW
Switched to LOW when an instantaneous state.
Instantaneous power
IPF power failure occurs or when the The transistor is OFF
failure
undervoltage protection is activated. (not conductive) in
Switched to LOW when the inverter output HIGH state.
frequency is equal to or higher than the preset
FU Frequency detection
detection frequency, and to HIGH when it is
less than the preset detection frequency.
Open collector output
SE Common terminal for terminals RUN, SU, OL, IPF, FU —
common
Permissible load
Output item:
current: 2 mA
For meter Output frequency
For full scale
(initial setting)
1440 pulses/s
Pulse

FM
 Outputs a selected monitored item (such as This terminal can be Maximum output pulse:
NPN open output frequency) among several monitored used for open 50k pulses/s
collector output items. The signal is not output during an collector outputs by Permissible load
inverter reset. setting Pr.291. current: 80 mA
The output signal is proportional to the
Output signal: 0 to 10
magnitude of the corresponding monitoring
VDC, Permissible load
item.
Analog voltage current: 1 mA
AM Use Pr.55, Pr.56, and Pr.866 to set full scales
output (load impedance 10 k
for the monitored output frequency, output Output item:
Analog

or more)
current, and torque. Output frequency
(Refer to the Instruction Manual (Function).)
Resolution: 8 bits
(initial setting)
Load impedance:
CA 200 to 450 
Analog current output
 Output signal: 0 to 20
mADC
 Terminal FM is provided in the FM-type inverter.
 Terminal CA is provided in the CA-type inverter.

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Communication
Terminal
Type

Terminal name Terminal function description

symbol
Communication can be made via Ethernet.
Category: 100BASE-TX/10BASE-T
Data transmission speed: 100 Mbps (100BASE-TX) / 10 Mbps (10BASE-T)
(Ethernet model)

Transmission method: Baseband

Ethernet

Maximum segment length: 100 m between the hub and the inverter
— Ethernet connector
Number of cascade connection stages: Up to 2 (100BASE-TX) / up to 4
(10BASE-T)
Interface: RJ-45
Number of interfaces available: 1
IP version: IPv4
With the PU connector, communication can be made through RS-485. (For
connection on a 1:1 basis only)
Conforming standard: EIA-485 (RS-485)
— PU connector
Transmission format: Multidrop link
Transmission speed: 4800 to 115200 bps
Wiring length: 500 m
RS-485

TXD+
RS-485 terminals

Inverter transmission terminal

(RS-485 model)

TXD- The RS-485 terminals enables the communication by RS-485.

Conforming standard: EIA-485 (RS-485)
RXD+ Transmission format: Multidrop link
Inverter reception terminal
RXD- Transmission speed: 300 to 115200 bps
GND Overall length: 500 m
Earthing (grounding)
(SG)
A connector (receptacle)
USB A connector A USB memory device enables parameter
copies and the trace function. Interface: Conforms to
USB1.1 (USB2.0 full-speed
Mini B connector (receptacle)
USB

— compatible)
Establish the connection with a personal
Transmission speed: 12
USB B connector computer via this USB connector to configure Mbps
the inverter setting, monitor and test the inverter
operation.

Safety stop signal

Refer
Terminal Rated
Terminal name Terminal function description to
symbol specification
page
Terminals S1 and S2 are used for the safety stop input signal for
Safety stop input the safety relay module. Terminals S1 and S2 are used at the
S1
(Channel 1) same time (dual channel). Input resistance 4.7
Inverter output is shutoff by shortening/opening between k
terminals S1 and SIC, or between S2 and SIC. Input current 4 to 6
In the initial status, terminals S1 and S2 are shorted with mADC (with 24 VDC
Safety stop input terminal PC by shorting wires. Terminal SIC is shorted with input)
S2
(Channel 2) terminal SD. Remove the shorting wires and connect the safety
relay module when using the safety stop function.
Safety stop input
SIC Common terminal for terminals S1 and S2. —
terminal common
Indicates the safety stop input signal status.
Switched to LOW when the status is other than the internal
58 2
Permissible load
safety circuit failure. Switched to HIGH during the internal safety
24 VDC (27 VDC at
circuit failure status.
maximum), 0.1 A
Safety monitor output (LOW is when the open collector output transistor is ON
So (SO) (The voltage drop is
(open collector output) (conducted). HIGH is when the transistor is OFF (not
3.4 V at maximum
conducted).)
while the signal is
Refer to the Safety Stop Function Instruction Manual when the
ON.)
signal is switched to HIGH while both terminals S1 and S2 are
open. (Please contact your sales representative for the manual.)
Safety monitor output
SOC Common terminal for terminal So (SO). —
terminal common

INSTALLATION AND WIRING 49

Control circuit

2.6.2 Control logic (sink/source) change

Change the control logic of input signals as necessary.
To change the control logic, change the jumper connector position on the control circuit board.
Connect the jumper connector to the connector pin of the desired control logic.
The control logic of input signals is initially set to the sink logic (SINK) for the FM type.
The control logic of input signals is initially set to the source logic (SOURCE) for the CA type.
(The output signals may be used in either the sink or source logic independently of the jumper connector position.)

SOURCE

SINK

Jumper connector
For sink logic

NOTE
• Make sure that the jumper connector is installed correctly.
• Never change the control logic while power is ON.

50 INSTALLATION AND WIRING

 Control circuit

Sink logic and source logic

• In the sink logic, a signal switches ON when a current flows from the corresponding signal input terminal.
Terminal SD is common to the contact input signals. Terminal SE is common to the open collector output signals.
• In the source logic, a signal switches ON when a current flows into the corresponding signal input terminal.
Terminal PC is common to the contact input signals. Terminal SE is common to the open collector output signals.

Current flow concerning the input/output signal Current flow concerning the input/output signal
when sink logic is selected when source logic is selected

Sink logic Source logic

PC

Current Sink
STF Current
connector
R STF
R Source
connector

STR
R STR
R

SD

Inverter DC input (sink type) Inverter DC input (source type)

<Example: QX40> <Example: QX80>

RUN TB1 RUN TB1

R R
R R

SE - + TB17 SE + - TB18

24 VDC 24 VDC

Current flow Current flow

• When using an external power supply for transistor output

Sink logic Source logic

Use terminal PC as a common terminal, and perform Use terminal SD as a common terminal, and perform
wiring as shown below. (Do not connect terminal SD of the wiring as shown below. (Do not connect terminal PC of the
inverter with terminal 0 V of the external power supply. inverter with terminal +24 V of the external power supply.
When using terminals PC-SD as a 24 VDC power supply, When using terminals PC-SD as a 24 VDC power supply,
do not install an external power supply in parallel with the do not install an external power supply in parallel with the
inverter. Doing so may cause a malfunction in the inverter inverter. Doing so may cause a malfunction in the inverter
due to undesirable currents.) due to undesirable currents.)

QY40P type transistor Inverter QY80 type transistor Inverter

output unit output unit
TB1 STF 24 VDC PC
(SD)
TB2 STR
TB1 STF 24 VDC
(SD)
2
TB2 STR
Constant TB17
Constant
voltage
24 VDC

PC voltage
circuit circuit
Fuse TB17
TB18
TB18 SD
24 VDC SD

Current flow Current flow

INSTALLATION AND WIRING 51

Control circuit

2.6.3 Wiring of control circuit

Control circuit terminal layout
• Recommended cable gauge: 0.3 to 0.75 mm2
∗1
2 5 4 1 F/C +24 SD So SOC SD SIC S1 S2 PC A1 B1 C1 A2 B2 C2

AM 5 10E 10 SE SE RUN SU IPF OL FU PC RL RM RH RT AU STP MRS RES SD SD STF STR JOG CS

 This terminal operates as the terminal FM for the FM type, and as the terminal CA for the CA type.

Wiring method
• Wiring connection
Use crimp terminals and stripped wire for the control circuit wiring. For single wire, the stripped wire can be used without crimp
terminal.
Connect the end of wires (crimp terminal or stranded wire) to the terminal block.

(1) Strip the signal wires as shown below. If too much of the wire is stripped, a short circuit may occur with neighboring wires.
If not enough of the wire is stripped, wires may become loose and fall out. Twist the stripped end of wires to prevent them
from fraying. Do not solder them.
Wire strip length

10 mm

(2) Use appropriate crimp terminals (ferrules, blade terminals, etc.).

Insert the wire into a crimp terminal, making sure that 0 to 0.5 mm of the wire protrudes from the end of the sleeve.
Check the condition of the crimp terminals after crimping. Do not use the crimp terminals of which the crimping is
inappropriate, or the face is damaged.
Unstranded
wires
ire
W
ve
ee
Sl

mm Wires are not inserted

.5
o0 Damaged Crumpled tip into the sleeve
0t

• Crimp terminals commercially available (as of April 2023)

Phoenix Contact GmbH & Co. KG
Ferrule part No. Crimping tool
Wire gauge (mm2)
With insulation sleeve Without insulation sleeve For UL wire model No.
0.3 AI 0,34-10TQ — —
0.5 AI 0,5-10WH — AI 0,5-10WH-GB
0.75 AI 0,75-10GY A 0,75-10 AI 0,75-10GY-GB
CRIMPFOX 6
1 AI 1-10RD A 1-10 AI 1-10RD/1000GB
1.25, 1.5 AI 1,5-10BK A 1,5-10 AI 1,5-10BK/1000GB
0.75 (for two wires) AI-TWIN 2 0,75-10GY — —
 A ferrule with an insulation sleeve compatible with the MTW wire which has a thick wire insulation.
 Applicable for terminals A1, B1, C1, A2, B2, and C2.

52 INSTALLATION AND WIRING

 Control circuit

NICHIFU Co., Ltd.

Crimping tool
Wire gauge (mm2) Blade terminal part No. Insulation part No.
model No.
0.3 to 0.75 BT 0.75-11 VC 0.75 NH 69

(3) Insert each wire into the terminal.

When using a single wire or stranded wires without a crimp terminal, push the
open/close button all the way down with a flathead screwdriver, and insert the
wire.
Open/close button

Flathead screwdriver

NOTE
• When using stranded wires without a crimp terminal, twist enough to avoid short circuit with a neighboring terminals or wires.
• Place the flathead screwdriver vertical to the open/close button. In case the blade tip slips, it may cause an inverter damage
or injury.
• Wire removal
Pull the wire while pushing the open/close button all
the way down firmly with a flathead screwdriver.
NOTE
Open/close button • Pulling out the wire forcefully without pushing the open/close
button all the way down may damage the terminal block.
• Use a small flathead screwdriver (tip thickness: 0.4 mm, tip
Flathead screwdriver
width: 2.5 mm).
If a flathead screwdriver with a narrow tip is used, terminal
block may be damaged.
Commercially available products (as of April 2023)

Product Model Manufacturer

SZF Phoenix Contact GmbH &
Screwdriver
0- 0,4 2,5 Co. KG

• Place the flathead screwdriver vertical to the open/close

button. In case the blade tip slips, it may cause an inverter
damage or injury.

Common terminals of the control circuit (SD, PC, 5, SE)

• Terminals SD (sink logic), PC (source logic), 5, and SE are common terminals (0V) for I/O signals. (All common terminals
are isolated from each other.) Do not earth (ground) these terminals. Avoid connecting terminal SD (sink logic) with 5,
terminal PC (source logic) with 5, and terminal SE with 5.
2
• In the sink logic, terminal SD is a common terminal for the contact input terminals (STF, STR, STP (STOP), RH, RM, RL,
JOG, RT, MRS, RES, AU, CS) and the pulse train output terminal (FM). The open collector circuit is isolated from the
internal control circuit by photocoupler.
• In the source logic, terminal PC is a common terminal for the contact input terminals (STF, STR, STP (STOP), RH, RM, RL,
JOG, RT, MRS, RES, AU, CS). The open collector circuit is isolated from the internal control circuit by photocoupler.
• Terminal 5 is a common terminal for the frequency setting terminals (2, 1 or 4) and the analog output terminals (AM, CA).
Use a shielded or twisted cable to protect the terminal against malfunction caused by external noise.
• Terminal SE is a common terminal for the open collector output terminals (RUN, SU, OL, IPF, FU). The contact input circuit
is isolated from the internal control circuit by photocoupler.
 Terminal FM is provided in the FM-type inverter.
 Terminal CA is provided in the CA-type inverter.

INSTALLATION AND WIRING 53

Control circuit

Signal inputs by contactless switches

The contact input terminals of the inverter (STF, STR, STP (STOP), RH, RM, RL, JOG, RT, MRS, RES, AU, CS) can be
controlled using a transistor instead of a contact switch as shown below.

+24 V Inverter

PC
+24 V

STF, etc

Inverter STF, etc

SD R

External signal input using transistor External signal input using transistor
(sink logic) (source logic)

2.6.4 Wiring precautions

• It is recommended to use a cable of 0.3 to 0.75 mm2 for the connection to the control circuit terminals.
• The wiring length should be 30 m (200 m for terminal FM) at the maximum.
• Use two or more parallel micro-signal contacts or twin contacts to prevent contact
faults when using contact inputs since the control circuit input signals are micro-
currents.
• To suppress EMI, use shielded or twisted cables for the control circuit terminals Micro signal contacts Twin contacts
and run them away from the main and power circuits (including the 200 V relay
sequence circuit). For the cables connected to the control circuit terminals, connect their shields to the common terminal of
the connected control circuit terminal. When connecting an external power supply to terminal PC, however, connect the
shield of the power supply cable to the negative side of the external power supply. Do not directly earth (ground) the shield
to the enclosure, etc.
• Always apply a voltage to the fault output terminals (A1, B1, C1, A2, B2, C2) via a relay coil, lamp, etc.
• Do not install an external power source in parallel with the internal 24 VDC power source (connected to terminals PC and
SD) to use them together.
• Separate the wiring of the control circuit away from the wiring of the main circuit.
Make cuts in rubber bush of the inverter side and lead the wires through.
<Wiring example>

Rubber bush
(viewed from inside)

Make cuts along the lines on

the inside with a cutter knife

54 INSTALLATION AND WIRING

 Control circuit

2.6.5 When using separate power supplies for the

control circuit and the main circuit
Cable size for the control circuit power supply (terminals R1/L11, S1/L21)
• Terminal screw size: M4
• Cable gauge: 0.75 to 2 mm2
• Tightening torque: 1.5 N·m

Connection method
<Connection diagram> When a fault occurs, opening of the electromagnetic contactor (MC) on the
MC inverter power supply side results in power loss in the control circuit, disabling the
R/L1 Inverter fault output signal retention. Terminals R1/L11 and S1/L21 are provided to hold a
S/L2 fault signal. In this case, connect the power supply terminals R1/L11 and S1/L21
T/L3 of the control circuit to the input side of the MC.
R1/L11 Do not connect the power cable to incorrect terminals. Doing so may damage the
S1/L21 inverter.
Remove the jumper

(a) Remove the upper screws.

(b) Remove the lower screws. R1/L11 S1/L21 (c)
Power supply
(c) Pull the jumper toward you terminal block
to remove. for the control circuit
Power supply terminal block
(d) Connect the separate for the control circuit
R/L1 S/L2 T/L3
power supply cable for the
R1/L11
control circuit to the upper S1/L21
terminals (R1/L11, S1/L21).
MC

Main power supply (a)

(b)
(d)

Power supply
terminal block for
the control circuit

2
NOTE
• When using separate power supplies, always remove the jumpers across terminals R/L1 and R1/L11 and across S/L2 and
S1/L21. The inverter may be damaged if the jumpers are not removed.
• The voltage should be the same as that of the main control circuit when the control circuit power is supplied from other than
the input side of the MC.
• The power capacity necessary when separate power is supplied from R1/L11 and S1/L21 is 80 VA.
• If the main circuit power is switched OFF (for 0.1 s or more) then ON again, the inverter is reset and a fault output will not be
held.

INSTALLATION AND WIRING 55

Control circuit

2.6.6 When supplying 24 V external power to the

control circuit
Connect the 24 V external power supply across terminals +24 and SD to enable I/O terminal ON/OFF operation, operation
panel displays, operations of the operation panel, or communication during communication operation even at power-OFF
state of inverter's main circuit power supply. When the main circuit power supply is turned ON, the power supply changes from
the 24 V external power supply to the main circuit power supply.

Specification of the applicable 24 V external power supply

Item Rated specification
Input voltage 23 to 25.5 VDC
Input current 1.4 A or less

Commercially available products (as of April 2023)

Model Product overview Manufacturer
Specifications: Capacity 50 W, output voltage 24 VDC, output current 2.2 A
S8FS-G05024C Installation method: Direct installation, screw type terminal block with cover
Input: Single-phase 100 to 240 VAC
Specifications: Capacity 60 W, output voltage 24 VDC, output current 2.5 A
S8VK-S06024 Installation method: DIN rail, push-in (spring) type terminal block OMRON Corporation
Input: Single-phase 100 to 240 VAC
Specifications: Capacity 240 W, output voltage 24 VDC, output current 10 A
S8VK-WA24024 Installation method: DIN rail, push-in (spring) type terminal block
Input: Three-phase 200 to 240 VAC

 For the latest information about OMRON power supply, contact OMRON corporation.

Starting and stopping the 24 V external power supply operation

• Supplying 24 V external power while the main circuit power is OFF starts the 24 V external power supply operation.
Likewise, turning OFF the main circuit power while supplying 24 V external power starts the 24 V external power supply
operation.
• Turning ON the main circuit power stops the 24 V external power supply operation and enables the normal operation.

NOTE
• When the 24 V external power is supplied while the main circuit power supply is OFF, the inverter operation is disabled.
• In the initial setting, when the main power supply is turned ON during the 24 V external power supply operation, a reset is
performed in the inverter, then the power supply changes to the main circuit power supply. (The reset can be disabled using
Pr.30.)

Confirming the 24 V external power supply input

• During the 24 V external power supply operation, "EV" blinks on the operation panel. The alarm lamp also blinks. Thus, the
24 V external power supply operation can be confirmed even when the operation panel is removed.
Blinking

Blinking

POWER ALARM

• During the 24 V external power supply operation, the 24 V external power supply operation (EV) signal is output. To use
the EV signal, set "68 (positive logic) or 168 (negative logic)" in one of Pr.190 to Pr.196 (Output terminal function
selection) to assign function to an output terminal.

56 INSTALLATION AND WIRING

 Control circuit

Operation while the 24 V external power is supplied

• Fault history and parameters can be read and parameters can be written (when the parameter write from the operation
panel is enabled) using the operation panel keys.
• During the 24 V external power supply operation, monitored items and signals related to inputs to main circuit power supply,
such as output current, converter output voltage, and IPF signal, are invalid.
• The safety stop function is invalid during the 24 V external power supply operation.
• The faults, which have occurred when the main circuit power supply is ON, continue to be output after the power supply is
changed to the 24 V external power supply. Perform the inverter reset or turn OFF then ON the power to reset the faults.
• If the power supply changes from the main circuit power supply to the 24 V external power supply while measuring the main
circuit capacitor's life, the measurement completes after the power supply changes back to the main circuit power supply
(Pr.259 = "3").
• The output data is retained when "1 or 11" is set in Pr.495 Remote output selection.

NOTE
• Inrush current equal to or higher than the 24 V external power supply specification may flow at power-ON. Confirm that the
power supply and other devices are not affected by the inrush current and the voltage drop caused by it. Depending on the
power supply, the inrush current protection may be activated to disable the power supply. Select the power supply and
capacity carefully.
• When the wiring length between the external power supply and the inverter is long, the voltage often drops. Select the
appropriate wiring size and length to keep the voltage in the rated input voltage range.
• In a serial connection of several inverters, the current increases when it flows through the inverter wiring near the power
supply. The increase of the current causes voltage to drop further. When connecting different inverters to different power
supplies, use the inverters after confirming that the input voltage of each inverter is within the rated input voltage range.
Depending on the power supply, the inrush current protection may be activated to disable the power supply. Select the power
supply and capacity carefully.
• The Safety circuit fault or the 24 VDC power fault may occur when the start-up time of the 24 V power supply is too long (less
than 1.5 V/s) in the 24 V external power supply operation.
• The 24 VDC power fault may occur when the 24 V external power supply input voltage is low. Check the external power
supply input.
• Do not touch the control circuit terminal block (circuit board) during the 24 V power supply operation (when conducted).
Otherwise you may get an electric shock or burn.

INSTALLATION AND WIRING 57

Control circuit

2.6.7 Safety stop function

Function description
The terminals related to the safety stop function are shown below.
Terminal
Terminal function description
symbol
S1 For input of the safety stop channel 1. Between S1 and SIC, S2 and SIC
Open: In safety stop mode
S2 For input of the safety stop channel 2. Short: Other than the safety stop mode.
SIC Common terminal for S1 and S2.
Outputs when an alarm or failure is detected. OFF: Internal safety circuit failure
So (SO)
The signal is output when no internal safety circuit failure exists. ON: No internal safety circuit failure
SOC Open collector output (terminal So (SO)) common

 In the initial status, terminals S1 and PC, S2 and PC, and SIC and SD are respectively shorted with shorting wires. To use the safety stop
function, remove all the shortening wires, and then connect to the safety relay module as shown in the following connection diagram.
 At an internal safety circuit failure, the operation panel displays one of the faults shown on the next page.

NOTE
• Use terminal So (SO) to output a fault and to prevent restarting of the inverter. The signal cannot be used as safety stop input
terminal to other devices.

Connection diagram
To prevent automatic restart after a fault occurrence, connect the reset button of a safety relay module or a safety
programmable controller across terminals So (SO) and SOC. The reset button acts as the feedback input for the safety relay
module or the safety programmable controller.

Inverter R/L1 S/L2 T/L3

So (SO)
Logic
SOC

IGBTs
+24V
PC Fuse Gate Gate
CPU ASIC Driver Driver
RESET
24VDC

S2 G G

Emergency S1
stop button SIC

SD
Safety relay module
/ Safety programmable controller
U V W

58 INSTALLATION AND WIRING

 Control circuit

Safety stop function operation

Output
Input terminal Output Operation panel
Input Internal safety signal Inverter running
, terminal indication
power circuit status , ,  status
S1 S2 So (SO) SAFE E.SAF SA
OFF ― ― ― OFF OFF Output shutoff (Safe state) Not displayed Not displayed
Normal ON ON ON OFF Drive enabled Not displayed Not displayed
Normal ON OFF OFF OFF Output shutoff (Safe state) Displayed Displayed
Normal OFF ON OFF OFF Output shutoff (Safe state) Displayed Displayed
Normal OFF OFF ON ON Output shutoff (Safe state) Not displayed Displayed
ON
Fault ON ON OFF OFF Output shutoff (Safe state) Displayed Not displayed
Fault ON OFF OFF OFF Output shutoff (Safe state) Displayed Displayed
Fault OFF ON OFF OFF Output shutoff (Safe state) Displayed Displayed
Fault OFF OFF OFF OFF Output shutoff (Safe state) Displayed Displayed
 ON: The transistor is conducted. OFF: The transistor is not conducted.
 When not using the safety stop function, short across terminals S1 and PC, S2 and PC, and SIC and SD to use the inverter. (In the initial status,
terminals S1 and PC, S2 and PC, and SIC and SD are respectively shorted with shorting wires.)
 If any of the protective functions shown in the following table is activated, terminal So (SO) and the SAFE signal turn OFF.

Operation panel Operation panel

Fault record Fault record
indication indication
Option fault E.OPT Speed deviation excess detection E.OSD
Communication option fault E.OP1 to E.OP3 Signal loss detection E.ECT
Parameter storage device fault E.PE Excessive position fault E.OD
Retry count excess E.RET Encoder signal loss for orientation E.ECA
Parameter storage device fault E.PE2 Brake sequence fault E.MB1 to E.MB7
Internal storage device fault E.PE6 E.CPU
CPU fault
Operation panel power supply short circuit/ E.5 to E.7
E.CTE
RS-485 terminals power supply short circuit Encoder phase fault E.EP
24 VDC power fault E.P24 Magnetic pole position unknown E.MP
Safety circuit fault E.SAF Internal circuit fault E.13
Overspeed occurrence E.OS
 When the internal safety circuit is operated normally (no faults occurs), terminal So (SO) and the SAFE signal remains ON until "E.SAF" is
displayed. Terminal So (SO) and the SAFE signal turns OFF when "E.SAF" is displayed.
 SA is displayed when terminals S1 and S2 are identified as OFF due to the internal safety circuit failure.
 If another fault occurs at the same time as E.SAF, the other fault can be displayed.
 If another warning occurs at the same time as SA, the other warning can be displayed.
 The ON/OFF state of the output signal is the one for the positive logic. The ON and OFF are reversed for the negative logic.
 For SAFE signal, refer to the following table and assign the function by Pr.190 to Pr.196 (Output terminal function selection).

Output Pr.190 to Pr.196 settings

signal Positive logic Negative logic
SAFE 80 180
 The use of SAFE signal has not been certified for compliance with safety standards.

For more details, refer to the Safety Stop Function Instruction Manual.

INSTALLATION AND WIRING 59

Communication connectors and terminals

2.7 Communication connectors and terminals

2.7.1 PU connector
Mounting the operation panel or the parameter unit on the enclosure
surface
• Having an operation panel or a parameter unit on the enclosure surface is convenient. With a connection cable, the
operation panel or the parameter unit can be mounted to the enclosure surface and connected to the inverter.
Use the option FR-CB2[ ], or connectors and cables available on the market.
(To mount the operation panel, the optional connector (FR-ADP) is required.)
Securely insert one end of the connection cable until the stoppers are fixed.

Parameter unit connection cable

(FR-CB2[ ]) (option)

Operation panel (FR-DU08)

Parameter unit (FR-PU07)
(option)

STF FWD PU

Operation panel connection

connector (FR-ADP)
Operation panel (FR-LU08) (option)
(option)

NOTE
• Refer to the following table when fabricating the cable on the user side. Keep the total cable length within 20 m.
Name Remarks
Communication cable Cable compliant with EIA-568 (such as 10BASE-T cable)

Communication operation
• Using the PU connector enables communication operation from a personal computer, etc. When the PU connector is
connected with a personal, FA or other computer by a communication cable, a user program can run to monitor the inverter
or read and write parameters.
Communication can be performed with the Mitsubishi inverter protocol (computer link operation).
For the details, refer to the Instruction Manual (Detailed).

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 Communication connectors and terminals

2.7.2 USB connector

USB host
(A connector) USB memory device
Communication status
Place a flathead screwdriver,
indicator (LED)
etc. in a slot and push up the
cover to open. USB device
(Mini B connector)

Personal computer
(FR Configurator2)

USB host communication

Interface Conforms to USB1.1
Transmission speed 12 Mbps
Wiring length Maximum 5 m
Connector USB A connector (receptacle)
Format FAT32
Compatible
Capacity 1 GB or more (used in the recorder mode of the trace function)
USB memory
Encryption function Not available
• Different inverter data can be saved in a USB memory device.
The USB host communication enables the following functions.
Function Description
• Copies the parameter setting from the inverter to the USB memory device. A maximum of 99 parameter setting
files can be saved in a USB memory device.
• The parameter setting data copied in the USB memory device can be copied to other inverters. This function is
Parameter copy
useful in backing up the parameter setting or for sharing the parameter setting among multiple inverters.
• The parameter setting data copied in the USB memory device can be saved in a personal computer and edited
in FR Configurator 2.
• The monitored data and output status of the signals can be saved in a USB memory device.
Trace
• The saved data can be imported to FR Configurator2 to diagnose the operating status of the inverter.
• This function copies the PLC function project data to a USB memory device when the PLC function is used.
• The PLC function project data copied in the USB memory device can be copied to other inverters.
PLC function data copy
• This function is useful in backing up the parameter setting and for allowing multiple inverters to operate by the
same sequence programs.

• When the inverter recognizes the USB memory device without any problem, " " is briefly displayed on the
operation panel.

• When the USB memory device is removed, " " is briefly displayed on the operation panel.
• The operating status of the USB host can be checked on the LED display of the inverter.
LED display status Operating status
OFF
ON
No USB connection.
The communication is established between the inverter and the USB device.
2
Blinking rapidly The USB memory device is being accessed. (Do not remove the USB memory device.)
Blinking slowly Error in the USB connection.

• When a device such as a USB battery charger is connected to the USB connector and an excessive current (500 mA or
more) flows, USB host error (UF warning) is displayed on the operation panel.
• When the UF warning appears, the USB error can be canceled by removing the USB device and setting Pr.1049 = "1". (The
UF warning can also be canceled by resetting the inverter power or resetting with the RES signal.)

NOTE
• Do not connect devices other than a USB memory device to the inverter.
• If a USB device is connected to the inverter via a USB hub, the inverter cannot recognize the USB memory device properly.

INSTALLATION AND WIRING 61

Communication connectors and terminals

USB device communication

The inverter can be connected to a personal computer with a USB (Ver. 1.1) cable.
Parameter setting and monitoring can be performed by FR Configurator 2.

Interface Conforms to USB1.1

Transmission speed 12 Mbps
Wiring length Maximum 5 m
Connector USB mini B connector (receptacle)
Power supply Self-powered

NOTE
• For the details of FR Configurator2, refer to the Instruction Manual of FR Configurator2.

2.7.3 RS-485 terminal block (RS-485 model)

Communication operation
Conforming standard EIA-485 (RS-485)
Transmission format Multidrop link
Communication speed maximum 115200 bps
Overall length 500 m
Connection cable Twisted pair cable (4 pairs)

The RS-485 terminals enable communication operation from a personal computer, etc. When the PU connector is connected
with a personal, FA or other computer by a communication cable, a user program can run to monitor the inverter or read and
write parameters.
Communication can be performed with the Mitsubishi inverter protocol (computer link operation) and MODBUS RTU protocol.
For the details, refer to the Instruction Manual (Detailed).

Terminating resistor switch

Initially-set to "OPEN".
Set only the terminating resistor switch of
the remotest inverter to the "100Ω" position.

P5S SG SDA1 SDB1 RDA1 RDB1

(VCC) (GND) (TXD1+) (TXD1-) (RXD1+) (RXD1-)

OPEN
VCC GND + TXD - + RXD -

100Ω VCC GND + TXD - + RXD -

P5S SG SDA2 SDB2 RDA2 RDB2

(VCC) (GND) (TXD2+) (TXD2-) (RXD2+) (RXD2-)

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 Communication connectors and terminals

2.7.4 Ethernet port (Ethernet model)

Ethernet communication specifications
Item Description
Category 100BASE-TX/10BASE-T
Data transmission speed 100 Mbps (100BASE-TX) / 10 Mbps (10BASE-T)
Transmission method Baseband
Maximum segment length 100 m between the hub and the inverter
Number of cascade connection stages Up to 2 (100BASE-TX) / up to 4 (10BASE-T)
Interface RJ-45
Number of interfaces available 1
IP version IPv4

Connection cable
Use Ethernet cables compliant with the following standards.
Communication speed Cable Connector Standard
100 Mbps Category 5 or higher, (shielded / STP) straight cable 100BASE-TX
Category 3 or higher, (shielded / STP) straight cable RJ-45 connector
10 Mbps 10BASE-T
Category 3 or higher, (UTP) straight cable

Hub
Use a hub that supports transmission speed of the Ethernet.

INSTALLATION AND WIRING 63

Connection of motor with encoder (vector control)

2.8 Connection of motor with encoder (vector

control)
Using encoder-equipped motors together with a vector control compatible option enables orientation control, encoder
feedback control, and speed, torque, and positioning control operations under full-scale vector control.
This section explains wiring for use of the FR-A8AP.

Appearance and parts name of the FR-A8AP

Front view (a) Rear view
Terminal layout (a) (a)
(h)
(d)

(f) 1
2
O
N

SW2
PB1
PZ1
PA1

PIN
PG
PG

PIN and PO
(c) SW3
are not used.
O
N

(e)
1
2
3
4
SW1
PB2
PZ2
PA2

PO
SD
SD

(a) (a)

(b) (a)

Refer to
Symbol Name Description
page
a Mounting hole Used for installation to the inverter. ―
b Terminal block Connected with the encoder. 67
c Encoder type selection switch (SW3) Switches the encoder type (differential line driver/complementary). 65
d CON2 connector Used for extension ―
e Terminating resistor selection switch (SW1) Switches ON or OFF the internal terminating resistor. 65
Do not change from the initially-set status. (Switches 1 and 2 are
f Switch for manufacturer setting (SW2) ―
OFF 1
2
O
N .)
g Connector Connected to the option connector of the inverter. 9
h LED for manufacturer check Not used. ―

Terminals of the FR-A8AP

Terminal
Terminal name Description
symbol
PA1 Encoder A-phase signal input terminal
PA2 Encoder A-phase inverse signal input terminal
PB1 Encoder B-phase signal input terminal
A-, B- and Z-phase signals are input from the encoder.
PB2 Encoder B-phase inverse signal input terminal
PZ1 Encoder Z-phase signal input terminal
PZ2 Encoder Z-phase inverse signal input terminal
Encoder power supply (positive side) input Input terminal for the encoder power supply.
PG
terminal Connect the external power supply (5 V, 12 V, 15 V, 24 V) and the encoder
power cable. When the encoder output is the differential line driver type, only
SD Encoder power supply ground terminal 5 V can be input. Make the voltage of the external power supply same as the
encoder output voltage. (Check the encoder specification.)
PIN
Not used.
PO

NOTE
• When the encoder's output voltage differs from its input power supply voltage, the signal loss detection (E.ECT) may occur.
• Incorrect wiring or faulty setting to the encoder will cause a fault such as an overcurrent (E.OC[ ]) and an inverter overload
(E.THT). Correctly perform the encoder wiring and setting.

64 INSTALLATION AND WIRING

 Connection of motor with encoder (vector control)

Switches of the FR-A8AP Differential line

driver (initial status)
• Encoder type selection switch (SW3)
Selects either the differential line driver or complementary setting. 1
2
O
N

SW2

It is initially set to the differential line driver. Switch its position according to the SW3

output circuit.

O
N
1
2
3
4
Complementary

SW1
• Terminating resistor selection switch (SW1) Internal terminating
Selects ON/OFF of the internal terminating resistor. resistor-ON
(initial status)
Set the switch to ON (initial status) when an encoder output type is
differential line driver, and set to OFF when complementary.
1 O
2 N

SW2

ON: with internal terminating resistor (initial status) SW3

O
N
OFF: without internal terminating resistor

1
2
3
4
SW1
Internal terminating
resistor-OFF
NOTE
• Set all switches to the same setting (ON/OFF).
• Set the switch "OFF" when sharing an encoder with another unit (NC
(computerized numerical controller), etc.) having a terminating resistor
under the differential line driver setting.
• The SW2 switch is for manufacturer setting. Do not change the setting.

• Encoder specification
Item Specification
Resolution 0 to 4096 Pulse/Rev (setting by Pr. 369)
Power supply voltage 5 V, 10 V, 15 V, 24 V
A, B phases (90° phase shift)
Output signal form
Z phase: 1 pulse/rev
Output circuit Differential line driver or complementary

NOTE
• Prepare an encoder's power supply (5 V/12 V/15 V/24 V) according to the encoder's output voltage. When the encoder output
is the differential line driver type, only 5 V can be input.
• When the control terminal option FR-A8TP is installed, 24 V power supply can be provided from the FR-A8TP.

INSTALLATION AND WIRING 65

Connection of motor with encoder (vector control)

Encoder cable
FR-JCBL FR-V7CBL
2 2
F-DPEVSB 12P 0.2mm D/MS3057-12A F-DPEVSB 12P 0.2 mm D/MS3057-12A
Approx. 140 mm
11 mm

11 mm
Approx. 140 mm
Earth cable
Earth cable

 60 mm
60 mm
L D/MS3106B20-29S
L D/MS3106B20-29S

Model Length L (m) • A P clip for earthing Model Length L (m)

FR-JCBL5 5 (grounding) a shielded FR-V7CBL5 5
FR-JCBL15 15
cable is provided. FR-V7CBL15 15
FR-JCBL30 30
FR-V7CBL30 30
FR-A870-LC FR-A870-LC
(FR-A8AP) PLG (FR-A8AP) PLG
PA1 C PA1 A
PA2 R PA2 B
PB1 A PB1 C
PB2 N PB2 D
PZ1 B PZ1 F
PZ2 P Positioning keyway PZ2 G Positioning keyway

M A B
N C M A B
PG H L PG S N C
SD K T P D SD R
L
P D
T
K E K E
S R S
J J R
F
H G H G F

D/MS3106B20-29S D/MS3106B20-29S
(As viewed from (As viewed from
2 mm2 wiring side) 2 mm2 wiring side)

 As the terminal block of the FR-A8AP is an insertion type, cables need to be treated. (Refer to the following description.)

• When using an encoder cable (FR-JCBL, FR-V5CBL, etc.) dedicated to the conventional motor, cut the crimp terminal of
the encoder cable and strip wires to make wires' ends exposed.
Also, treat the shielding wires of the shielded twisted pair cable to ensure that they will not contact conductive areas.
Twist the stripped end of wires to prevent them from fraying. Do not solder them.

Wire strip length

5 mm

NOTE
• Information on crimp terminals
Commercially available products (as of April 2023)
Phoenix Contact GmbH & Co. KG.

Terminal screw Wire gauge Ferrule part No. Crimping tool

size (mm2) With insulation sleeve Without insulation sleeve model No.
0.3 AI 0,34-6TQ A 0,34-7
M2 CRIMPFOX 6
0.5 AI 0,5-6WH A 0,5-6

NICHIFU Co.,Ltd.

Terminal screw Wire gauge Crimping tool

Blade terminal part No. Insulation cap part No.
size (mm2) model No.
M2 0.3 to 0.75 BT 0.75-7 VC 0.75 NH 69

• When using the crimp terminal without insulation sleeve,

make sure that the twisted stripped end does not come out
of the terminal.

66 INSTALLATION AND WIRING

 Connection of motor with encoder (vector control)

• Connection terminal compatibility table

Encoder cable FR-V7CBL FR-JCBL

PA1 PA PA
PA2 Do not connect anything to this. PAR
PB1 PB PB
PB2 Do not connect anything to this. PBR
FR-A8AP terminal
PZ1 PZ PZ
PZ2 Do not connect anything to this. PZR
PG PG 5E
SD SD AG2

Wiring example
• Speed control
Standard motor with encoder, 5 V differential line driver

MCCB MC Inverter Motor with encoder

Three-phase R/L1 U U
AC power S/L2 V V
IM
supply T/L3 W W
E
Forward rotation start STF Earth
FR-A8AP (Ground)
Reverse rotation start STR PA1 C ∗1
Contact input common SD PA2 R

PB1 A
PB2 N
10 Differential PLG
Frequency command 3 PZ1 B
Frequency setting 2
2 PZ2 P ∗2
potentiometer
1/2W1kΩ 1 5 Complementary
PG H
Terminating SD K
resistor ON
Torque limit PG
(+) 1
command (-) ∗3
SD
(±10V) (+) (-) 5VDC power supply
OFF ∗6
∗5
∗4

• Torque control
Standard motor with encoder, 5 V differential line driver

MCCB MC Inverter Motor with encoder

R/L1 U U
Three-phase
AC power S/L2 V V
IM
supply T/L3 W W
E
Forward rotation start STF Earth
FR-A8AP (Ground)
Reverse rotation start STR PA1 C ∗1
Contact input common SD PA2 R

PB1 A
PB2 N
Speed limit command 3
Frequency setting 2
10 Differential
PZ1 B
PLG
2
2 PZ2 P ∗2
potentiometer
1/2W1kΩ 1 Complementary
5 PG H
Terminating SD K
Torque command (+) 1 resistor ON
PG
(±10V) (-) ∗3
SD
(+) (-) 5VDC power supply
OFF ∗6
∗5
∗4

INSTALLATION AND WIRING 67

Connection of motor with encoder (vector control)

• Position control
Vector control dedicated motor, 12 V complementary
Positioning unit
MELSEC-iQ-R RD75P[] Vector control
MELSEC-Q QD75P[ ]N/QD75P[ ] dedicated motor
MCCB MC
MELSEC-L LD75P[ ]
R/L1 Inverter U U
Three-phase
AC power S/L2 V V
IM
supply T/L3 W W
FLS
E
RLS
Earth
DOG (ground)
STOP
Forward stroke end
STF
Reverse stroke end FR-A8AP
STR PA1 A ∗1
Pre-excitation/servo on
LX ∗7 PA2 B
Clear signal
CLEAR CLR ∗7 C
Pulse train PB1
PULSE F JOG ∗8 PB2 D
Sign signal
PULSE R NP ∗7 Differential PLG
24VDC power supply line driver PZ1 F
CLRCOM PC PZ2 G ∗2

PULSE COM SE
Complementary PG S
RDYCOM
Terminating SD R
COM resistor
Preparation ready signal ON PG
READY RDY ∗9
SD ∗3
5 ∗4
12VDC
∗6 (+) (-) power supply ∗5
OFF
Torque limit command (+) 1
(±10V) (-)

 The pin number differs according to the encoder used.

Speed, control, torque control, and position control by pulse train input are available with or without the Z-phase
being connected.
 Connect the encoder so that there is no looseness between the motor and motor shaft. Speed ratio must be 1:1.
 Earth (ground) the shield of the encoder cable to the enclosure using a tool such as a P-clip. (Refer to page 69.)
 For the complementary, set the terminating resistor selection switch to OFF position. (Refer to page 65.)
 A separate power supply of 5 V/12 V/15 V/24 V is necessary according to the encoder power specification.
When the encoder output is the differential line driver type, only 5 V can be input.
Make the voltage of the external power supply the same as the encoder output voltage, and connect the external
power supply across PG and SD.
 For terminal compatibility of the FR-JCBL, FR-V7CBL, and FR-A8AP, refer to page 67.
 Assign the function using Pr.178 to Pr.184, Pr.187 to Pr.189 (Input terminal function selection).
 When position control is selected, terminal JOG function is invalid and simple position pulse train input terminal
becomes valid.
 Assign the function using Pr.190 to Pr.194 (Output terminal function selection).

68 INSTALLATION AND WIRING

 Connection of motor with encoder (vector control)

Instructions for encoder cable wiring

• Use shielded twisted pair cables (0.2 mm2 or larger) to connect the FR-A8AP. For the wiring to terminals PG and SD, use
several cables in parallel or use a thick cable, according to the wiring length.
To protect the cables from noise, run them away from any source of noise (such as the main circuit and power supply
voltage).
Example of parallel connection
with two cables
(with complementary encoder output)
FR-A800
(FR-A8AP) Encoder
PA1 A
PA2 B
FB1 C
FB2 D
PZ1 F
PZ2 G

PG S
SD R

2 mm2

Wiring length Parallel connection Larger-size cable

Within 10 m At least two cables in parallel 0.4 mm2 or larger
Within 20 m At least four cables in parallel Cable gauge 0.2 mm2 0.75 mm2 or larger
Within 100 m* At least six cables in parallel 1.25 mm2 or larger
 When differential line driver is set and a wiring length is 30 m or more.
The wiring length can be extended to 100 m by increasing the 5 V power supply (approximately to 5.5 V) while using six or more 0.2 mm2 gauge
cables in parallel or a 1.25 mm2 or larger gauge cable. The voltage applied must be within power supply specifications of encoder.

• To reduce noise of the encoder cable, earth (ground) the encoder's shielded cable to the enclosure
(as close as possible to the inverter) with a P-clip or U-clip made of metal.

Earthing (grounding) example using a P-clip

Encoder cable
Shield
P-clip

• When one encoder is shared between FR-A8AP and CNC (computerized numerical controller), its output signal should be
connected as shown below. In this case, the wiring length between FR-A8AP and CNC should be as short as possible,
within 5 m.
Inverter
Encoder
(FR-A8AP)

CNC
Maximum 5 m
(two parallel cables)
2
NOTE
• For the details of the optional encoder dedicated cable (FR-JCBL/FR-V7CBL), refer to page 66.
• The FR-V7CBL is provided with a P-clip for earthing (grounding) shielded cables.

INSTALLATION AND WIRING 69

Parameter settings for a motor with encoder

2.9 Parameter settings for a motor with

encoder
Parameter for the encoder (Pr.359, Pr.369)
• Set the encoder specifications.
Initial Setting
Pr. Name Description
value range
Set when using a motor for which forward Set for the operation at 120 Hz or
0
rotation (encoder) is clockwise (CW) viewed less.
from the shaft
Set for the operation at a
100 CW
frequency higher than 120 Hz.
359 852 Encoder rotation
1
C141 C241 direction Set when using a motor for which forward Set for the operation at 120 Hz or
1
rotation (encoder) is counterclockwise less.
(CCW) viewed from the shaft
Set for the operation at a
101 CCW
frequency higher than 120 Hz.

369 851 Number of Set the number of encoder pulses output.

1024 0 to 4096
C140 C240 encoder pulses Set the number of pulses before it is multiplied by 4.
The parameters above can be set when a vector control compatible option is installed.

• The following table shows parameters to be set according to a vector control compatible option to be used.
FR-A8AP/FR-A8AL/
FR-A8APR FR-A8APS FR-A8TP
Item FR-A8APA
parameter parameter parameter
parameter
Encoder/Resolver rotation direction Pr.359 Pr.852
― (Obtained via
Number of detector pulses Pr.369 ― (fixed 1024 pulses) communication from Pr.851
the encoder)

Parameter settings for the motor under vector control

Pr.359/Pr.852 Pr.369/Pr.851
Pr.9 Pr.71 Pr.80 Pr.81
Encoder Number of
Motor name Electronic Applied Motor Number of
rotation encoder
thermal O/L relay motor capacity motor poles
direction pulses
Number of
Standard motor Rated motor current 0 (3) Motor capacity  
motor poles
Constant-torque Number of
Rated motor current 1 (13) Motor capacity  
motor motor poles
 Offline auto tuning is required. (Refer to the Instruction Manual (Detailed).)
 Set this parameter according to the motor.

70 INSTALLATION AND WIRING

 Connection of stand-alone option units

2.10 Connection of stand-alone option units

The inverter accepts a variety of stand-alone option units as required.
Incorrect connection will cause inverter damage or accident. Connect and operate the option unit carefully in accordance with
the corresponding option unit manual.

2.10.1 Connection of the brake unit (FR-BU2)

Connect the brake unit (FR-BU2(H)) as shown below to improve the braking capability during deceleration.

Connection example with the MT-BR5 type resistor unit

After wiring securely, set Pr.30 Regenerative function selection = "1" and Pr.70 Special regenerative brake duty = "0
(initial value)".
Set Pr.0 Brake mode selection = "2" in the brake unit FR-BU2.

T ∗2

MCCB MC ON OFF CR1

Three phase Motor
R/L1 U
AC power S/L2 V M MC
T/L3 W MC
supply
10 m
∗4
∗1 or less CR1
P/+ P ∗3 P
N/- N P TH1
∗3
PR
BUE PR
SD A TH2
B
C

Inverter Brake unit Resistor unit

∗5 FR-BU2 MT-BR5
 When wiring, make sure to match the terminal symbol (P/+, N/-) at the inverter side and at the brake unit
(FR-BU2) side. (Incorrect connection will damage the inverter and brake unit.)
 When the power supply is 400 V class, install a stepdown transformer.
 The wiring distance between the inverter and brake unit (FR-BU2), and between the brake unit (FR-BU2)
and resistor unit (MT-BR5) must be within 5 m. Even when the wire is twisted, the cable length must be
within 10 m.
 The contact between TH1 and TH2 is open in the normal status and is closed at a fault.
 The CN8 connector used with the MT-BU5 type brake unit is not used.

NOTE
• The stall prevention (overvoltage), oL, does not occur while Pr.30 Regenerative function selection = "1" and Pr.70 Special
regenerative brake duty = 0% (initial value). (Refer to the Instruction Manual (Detailed).)

INSTALLATION AND WIRING 71

Connection of stand-alone option units

2.10.2 Connection of the high power factor converter

(FR-HC2)
When connecting the high power factor converter (FR-HC2) to suppress power harmonics, perform wiring securely as shown
below. Incorrect connection will damage the high power factor converter and the inverter.
After making sure that the wiring is correct, set "rated motor voltage" in Pr.19 Base frequency voltage (under V/F control) or
Pr.83 Rated motor voltage (under other that V/F control) and "2" in Pr.30 Regenerative function selection.

High power
Outside box factor converter
Reactor1 (FR-HCB2)∗10 Reactor2 (FR-HC2) Inverter
MCCB MC (FR-HCL21) (FR-HCL22)
∗1
∗7 R/ ∗7 R2/ R3/ ∗7 R3/ R4/ ∗7 R/L1 Motor
R2/ R4/L14
L1 L12 L12 L13 L13 L14 U
Three-phase S/L2
S/ S2/ S2/ S3/ S3/ S4/ T/L3 W V M
AC power L2 L22 L23 L23 L24 S4/L24
L22
supply R1/L11
T/ T2/ T2/ T3/ T3/ T4/
L3 L32 L32 L33 L33 L34 T4/L34 S1/L21 Earth
∗8
Fuse ∗9
∗8 (ground)
P/+ P/+
∗2
ROH1 ROH N/- N/-
ROH2 SD ∗5
88R 88R RDY X10 ∗3
88S 88S ∗4 IPF X11 ∗3
R/L1 RSO RES
∗8 S/L2 ∗6
T/L3 SE SD
R1/L11
S1/L21 ∗8 ∗8

 Remove jumpers between terminal R/L1 and R1/L11 as well as between S/L2 and S1/L21, and connect the power supply for the control
circuit to terminals R1/L11 and S1/L21. Do not connect anything to power input terminals (R/L1, S/L2, T/L3). Incorrect connection will
damage the inverter. (E.OPT (option fault) will occur. (Refer to the Instruction Manual (Detailed).))
 Do not install an MCCB across terminals P/+ and N/- (across terminals P and P/+ or across N and N/-). Connecting the opposite polarity of
terminals N/- and P/+ will damage the inverter.
 Use Pr.178 to Pr.189 (Input terminal function selection) to assign the terminals used for the X10 (X11) signal. (Refer to the Instruction
Manual (Detailed).)
For RS-485 or any other communication where the start command is only transmitted once, use the X11 signal to save the operation mode
at the time of an instantaneous power failure.
 Assign the IPF signal to an FR-HC2 terminal. (Refer to the Instruction Manual of the FR-HC2.)
 Always connect the FR-HC2 terminal RDY to a terminal where the X10 signal or MRS signal is assigned in the inverter. Always connect the
FR-HC2 terminal SE to the inverter terminal SD. Not connecting these terminals may damage the FR-HC2.
 Always connect the R/L1, S/L2, and T/L3 terminals of the FR-HC2 to the power supply. Operating the inverter without connecting them will
damage the FR-HC2.
 Do not install an MCCB or MC between the reactor 1 terminals (R/L1, S/L2, T/L3) and the FR-HC2 terminals (R4/L14, S4/L24, T4/L34). It
will not operate properly.
 Securely perform grounding (earthing) by using the grounding (earthing) terminal.
 Installation of a fuse is recommended. (Refer to the Instruction Manual of the FR-HC2.)
 Outside box is not available for the FR-HC2-H280K or higher. Connect filter capacitors, inrush current limit resistors, and magnetic
contactors. (Refer to the Instruction Manual of the FR-HC2.)

NOTE
• The voltage phases of terminals R/L1, S/L2, and T/L3 and the voltage phases of terminals R4/L14, S4/L24, and T4/L34 must
be matched.
• The control logic (sink logic/source logic) of the high power factor converter and the inverter must be matched. (Refer to page
50.)
• Do not connect a DC reactor (FR-HEL) to the inverter when the FR-HC2 is connected.

72 INSTALLATION AND WIRING

 Connection of stand-alone option units

2.10.3 Connection of the DC reactor (FR-HEL)

• Always connect a DC reactor, which is selected according to the applied motor capacity.
• Keep the surrounding air temperature within the permissible range (-10 to +50°C). Keep enough clearance around the
reactor because it heats up. (Take 10 cm or more clearance on top and 5 cm or more on left and right.)

10 cm or more

5 cm or 5 cm or 5 cm or 5 cm or
more more more more

• Connect the DC reactor (FR-HEL) across terminals P/+ and P1.

• Since the DC reactor (FR-HEL) is electrically connected to the enclosure through mounting screws, the DC reactor is
earthed (grounded) by being securely installed to the enclosure. If the DC reactor is not earthed (grounded) securely
enough, use an earth (ground) terminal to perform additional earthing (grounding). (Refer to the Instruction Manual of the
FR-HEL.)

NOTE
• The wiring distance must be within 5 m.
• As a reference, the cable gauge for the connection must be equal to or larger than that of the power supply cables (R/L1, S/
L2, T/L3) and the earthing (grounding) cable. (Refer to page 37.)
• Incorrect connection will cause inverter damage or accident. Connect and operate the FR-HEL carefully in accordance with
the its Instruction Manual.

INSTALLATION AND WIRING 73

Installing a communication option

2.11 Installing a communication option

• To use a communication option, the enclosed earthing (grounding) cable needs to be installed. Install the cable according
to the following procedure.
No. Installation procedure
1 Insert spacers into the mounting holes that will not be tightened with the option mounting screws.
Fit the connector of the communication option to the guide of the connector of the inverter, and insert the option as far as it goes.
2
(Insert it to the inverter option connector 1.)
Remove the mounting screw (lower) of the Ethernet board earth plate. Fit the one terminal of the earthing (grounding) cable on the
3
Ethernet board earth plate and fix it securely to the inverter with the mounting screw (tightening torque 0.33 N·m to 0.40 N·m).
Fix the left part of the communication option securely with the option mounting screw, and place another terminal of the earthing
(grounding) cable on the right part of the option and fix the cable terminal and the option with the option mounting screw (tightening
4
torque 0.33 N·m to 0.40 N·m). If the screw holes do not line up, the connector may not be inserted deep enough. Check the
connector.

Option connector 1

Spacer

Mounting screw

Spacer
Spacer

Spacer

Mounting screw
Earth cable
Earth cable
Ethernet board
earth plate Example of FR-A8NC Mounting screw
Ethernet board
earth plate

NOTE
• The number and shape of the spacers used differ depending on the communication option type. Refer to the Instruction
Manual of each communication option for details.
• The earth plate enclosed with a communication option is not used.

74 INSTALLATION AND WIRING

 3 PRECAUTIONS FOR
USE OF THE
INVERTER

This chapter explains the precautions for use of this product.

Always read the instructions before use.

3.1 Electro-magnetic interference (EMI) and leakage currents ..76

3.2 Power supply harmonics .........................................................80
3.3 Power-OFF and magnetic contactor (MC) ..............................81
3.4 Countermeasures against deterioration of the 400 V class
motor insulation........................................................................82
3.5 Checklist before starting operation ........................................83
3.6 Failsafe system which uses the inverter ................................86

PRECAUTIONS FOR USE OF THE INVERTER 75

Electro-magnetic interference (EMI) and leakage currents

3.1 Electro-magnetic interference (EMI) and

leakage currents
3.1.1 Leakage currents and countermeasures
Capacitances exist between the inverter I/O cables, other cables and earth and in the motor, through which a leakage current
flows. Since its value depends on the static capacitances, carrier frequency, etc., low acoustic noise operation at the
increased carrier frequency of the inverter will increase the leakage current. Therefore, take the following countermeasures.
Select the earth leakage current breaker according to its rated sensitivity current, independently of the carrier frequency
setting.

To-earth (ground) leakage currents

Leakage currents may flow not only into the power system of the inverter but also into the other power systems through the
earthing (grounding) cable, etc. These leakage currents may operate earth leakage circuit breakers and earth leakage relays
unnecessarily.
Suppression technique
• If the carrier frequency setting is high, decrease the Pr.72 PWM frequency selection setting.
Note that motor noise increases. Selecting Pr.240 Soft-PWM operation selection makes the sound inoffensive.
• By using earth leakage circuit breakers designed to suppress harmonics and surge voltage in the power system of the
inverter and other devices, operation can be performed with the carrier frequency kept high (with low noise).
To-earth (ground) leakage currents
• Take caution as long wiring will increase the leakage current. Decreasing the carrier frequency of the inverter reduces the
leakage current.
• Increasing the motor capacity increases the leakage current.

Line-to-line leakage currents

Harmonics of leakage currents flowing in static capacitances between the inverter output cables may operate the external
thermal relay unnecessarily.
MCCB MC Thermal relay
Motor
Power
supply Inverter M

Line-to-line static
capacitances
Line-to-line leakage currents path

Precautions
• Use Pr.9 Electronic thermal O/L relay.
• If the carrier frequency setting is high, decrease the Pr.72 PWM frequency selection setting.
Note that motor noise increases. Selecting Pr.240 Soft-PWM operation selection makes the sound inoffensive.
To ensure that the motor is protected against line-to-line leakage currents, it is recommended to use a temperature sensor
to directly detect motor temperature.

Installation and selection of the molded case circuit breaker

Install a molded case circuit breaker (MCCB) on the power receiving side to protect the wiring at the inverter input side.
Select an MCCB according to the inverter input side power factor, which depends on the power supply voltage, output
frequency and load. Especially for a completely electromagnetic MCCB, a slightly large capacity must be selected since its
operation characteristic varies with harmonic currents. (Check it in the data of the corresponding breaker.) As an earth
leakage current breaker, use the earth leakage current breaker designed for harmonics and surge suppression.

76 PRECAUTIONS FOR USE OF THE INVERTER

 Electro-magnetic interference (EMI) and leakage currents

3.1.2 Countermeasures against inverter-generated

EMI
Some electromagnetic noises enter the inverter to cause the inverter malfunction, and others are radiated by the inverter to
cause the peripheral devices to malfunction. Though the inverter is designed to have high immunity performance, it handles
low-level signals, so it requires the following basic techniques. Also, since the inverter chops outputs at high carrier frequency,
that could generate electromagnetic noises. If these electromagnetic noises cause peripheral devices to malfunction, EMI
countermeasures should be taken to suppress noises. These techniques differ slightly depending on EMI paths.
• Basic techniques
- Do not run the power cables (I/O cables) and signal cables of the inverter in parallel with each other and do not bundle
them.
- Use shielded twisted pair cables for the detector connecting and control signal cables and connect the sheathes of the
shielded cables to terminal SD.
- Ground (Earth) the inverter, motor, etc. at one point.
• Techniques to reduce electromagnetic noises that enter and cause a malfunction of the inverter (EMI countermeasures)
When devices that generate many electromagnetic noises (which use magnetic contactors, electromagnetic brakes, many
relays, for example) are installed near the inverter and the inverter may malfunction due to electromagnetic noises, the
following countermeasures must be taken:
- Provide surge suppressors for devices that generate many electromagnetic noises to suppress electromagnetic noises.
- Install data line filters (page 78) to signal cables.
- Ground (Earth) the shields of the detector connection and control signal cables with cable clamp metal.
• Techniques to reduce electromagnetic noises that are radiated by the inverter to cause the peripheral devices to
malfunction (EMI countermeasures)
Inverter-generated noises are largely classified into those radiated by the cables connected to the inverter and inverter
main circuits (I/O), those electromagnetically and electrostatically induced to the signal cables of the peripheral devices
close to the main circuit power supply, and those transmitted through the power supply cables.

Inverter generated
Air propagated Noise directly
electromagnetic radiated from inverter
Path (a)
noise
noise
Noise radiated from
power supply cable
Path (b) (e) Telephone
Noise radiated from
motor connection cable
Path (c)
(g) (g)
Electromagnetic (b)
Path (d), (e)
induction noise
(a) Sensor
Electrostatic power supply
Path (f)
induction noise Instrument Receiver (c) Inverter
(f) (a) (f)
Electrical path Noise propagated through
propagated noise power supply cable Path (g) (d)
Noise from earthing (c) Sensor
(grounding) cable due to
leakage current
Path (h) Motor M

PRECAUTIONS FOR USE OF THE INVERTER 77

Electro-magnetic interference (EMI) and leakage currents

Noise
Countermeasure
propagation path
When devices that handle low-level signals and are liable to malfunction due to electromagnetic noises, e.g.
instruments, receivers and sensors, are contained in the enclosure that contains the inverter or when their signal
cables are run near the inverter, the devices may malfunction due to by air-propagated electromagnetic noises. The
following countermeasures must be taken:
• Install easily affected devices as far away as possible from the inverter.
(a)(b)(c) • Run easily affected signal cables as far away as possible from the inverter and its I/O cables.
• Do not run the signal cables and power cables (inverter I/O cables) in parallel with each other and do not bundle them.
• Set the EMC filter ON/OFF connector of the inverter to the ON position. (Refer to page 79.)
• Inserting a line noise filter into the output suppresses the radiated noise from the cables.
• Use shielded cables as signal cables and power cables and run them in individual metal conduits to produce
further effects.
When the signal cables are run in parallel with or bundled with the power cables, magnetic and static induction
noises may be propagated to the signal cables to cause malfunction of the devices and the following
countermeasures must be taken:
• Install easily affected devices as far away as possible from the inverter.
(d)(e)(f)
• Run easily affected signal cables as far away as possible from the inverter and its I/O cables.
• Do not run the signal cables and power cables (inverter I/O cables) in parallel with each other and do not bundle them.
• Use shielded cables as signal cables and power cables and run them in individual metal conduits to produce
further effects.
When the peripheral devices use the power system of the inverter, its generated noises may flow back through the
power supply cables to cause malfunction of the devices and the following countermeasures must be taken:
(g)
• Set the EMC filter ON/OFF connector of the inverter to the ON position. (Refer to page 79.)
• Install the line noise filter to the power cables (output cables) of the inverter.
When a closed loop circuit is formed by connecting the peripheral device wiring to the inverter, leakage currents
(h) may flow through the earthing (grounding) cable of the inverter to cause the device to malfunction. In that case,
disconnecting the earthing (grounding) cable from the device may stop the malfunction of the device.

Data line filter

Data line filter is effective as an EMI countermeasure. Provide a data line filter for the detector cable, etc.
<Example> Data line filter : ZCAT3035-1330 (by TDK)
: ESD-SR-250 (by TOKIN)
Impedance (ZCAT3035-1330)

39 1 Cable fixing band

Impedance (Ω)
13 1

34 1 mount
10 to 100 MHz 100 to 500 MHz
80 150
The impedance values above are reference values,
30 1

and not guaranteed values. TDK

[Unit: mm]
Product name Lot number
OUTLINE DIMENSION DRAWINGS (ZCAT3035-1330)

EMI countermeasure example

Enclosure Decrease carrier frequency Install filter on
inverter output side.
Inverter
Line
power EMC
Inverter noise M Motor
supply filter
filter
Use 4-core cable for motor
Separate inverter and power cable and use one cable
power line by more than as earth (ground) cable.
30 cm (at least 10 cm)
from sensor circuit. Use a twisted pair shielded cable
Control Power Sensor
power supply for
supply sensor
Do not earth (ground) Do not earth (ground) shield but
enclosure directly. connect it to signal common cable.
Do not earth (ground) control cable.

78 PRECAUTIONS FOR USE OF THE INVERTER

 Electro-magnetic interference (EMI) and leakage currents

NOTE
• For compliance with the EU EMC Directive, refer to page 112.

3.1.3 Built-in EMC filter

This inverter is equipped with a built-in EMC filter (capacitive filter) and a common mode choke.
These filters are effective in reducing air-propagated noise on the input side of the inverter.
To enable the EMC filter, fit the EMC filter ON/OFF connector to the ON position. The FM type is initially set to "disabled"
(OFF), and the CA type to "enabled" (ON).

FILTER FILTER EMC filter

ON/OFF
OFF ON

OFF ON

connector

EMC filter OFF EMC filter ON

<How to enable or disable the filter>

• Before removing a front cover, check to make sure that the indication of the inverter operation panel is OFF, wait for at least
10 minutes after the power supply has been switched OFF, and check that there is no residual voltage using a tester or the
like.
• When disconnecting the connector, push the fixing tab and pull the connector straight without pulling the cable or forcibly
pulling the connector with the tab fixed. When installing the connector, also engage the fixing tab securely. (If it is difficult to
disconnect the connector, use a pair of needle-nose pliers, etc.)

EMC filter Disengage connector fixing tab With tab disengaged,

ON/OFF connector pull up the connector straight.
(Side view)

NOTE
• Fit the connector to either ON or OFF position.
• Enabling (turning ON) the EMC filter increases leakage current. (Refer to page 77.)

WARNING
 While power is ON or when the inverter is running, do not open the front cover. Otherwise you may
get an electric shock.
3

PRECAUTIONS FOR USE OF THE INVERTER 79

Power supply harmonics

3.2 Power supply harmonics

3.2.1 Power supply harmonics

The inverter may generate power supply harmonics from its converter circuit to affect the power generator, power factor
correction capacitor etc. Power supply harmonics are different from noise and leakage currents in source, frequency band and
transmission path. Take the following countermeasure suppression techniques.

• The differences between harmonics and noises

Item Harmonics Noise
Normally 40th to 50th degrees or less (3 kHz
Frequency High frequency (several 10 kHz to 1 GHz order).
or less).
Location To-electric channel, power impedance. To-space, distance, wiring path,
Quantitative understanding Theoretical calculation possible. Random occurrence, quantitative grasping difficult.
Changes with the current variation ratio. (Gets larger as
Generated amount Nearly proportional to the load capacity.
switching speed increases.)
Affected equipment immunity Specified by standards per equipment. Different depending on maker's equipment specifications.
Countermeasure Provide a reactor. Increase distance.

• Countermeasures
The harmonic current generated from the inverter to the
DC reactor
input side differs according to various conditions such as the (FR-HEL)
wiring impedance, whether a reactor is used or not, and
output frequency and output current on the load side.
MCCB MC P/+ P1
Power supply

For the output frequency and output current, we understand

R/L1 U
that this should be calculated in the conditions under the
S/L2 V M
rated load at the maximum operating frequency.
T/L3 W

Inverter Do not insert power

factor improving capacitor.

NOTE
• The power factor improving capacitor and surge suppressor on the inverter output side may be overheated or damaged by
the harmonic components of the inverter output. Also, since an excessive current flows in the inverter to activate overcurrent
protection, do not provide a capacitor and surge suppressor on the inverter output side when the motor is driven by the
inverter. For power factor improvement, install a reactor on the inverter in the DC circuit.

80 PRECAUTIONS FOR USE OF THE INVERTER

 Power-OFF and magnetic contactor (MC)

3.3 Power-OFF and magnetic contactor (MC)

Inverter input side magnetic contactor (MC)
On the inverter input side, it is recommended to provide an MC for the following purposes:
(Refer to page 16 for selection.)
• To disconnect the inverter from the power supply at activation of a protective function or at malfunctioning of the driving
system (emergency stop, etc.).
• To prevent any accident due to an automatic restart at power restoration after an inverter stop made by a power failure.
• To separate the inverter from the power supply to ensure safe maintenance and inspection work.

NOTE
• Since repeated inrush currents at power ON will shorten the life of the converter circuit (switching life is about 1,000,000
times), frequent starts and stops of the magnetic contactor must be avoided. Turn ON/OFF the inverter start controlling
terminals (STF, STR) to run/stop the inverter.

• Inverter start/stop circuit example

MCCB MC As shown on the left, always use the start signal
R/L1 U To the
Power motor (ON or OFF of STF (STR) signal) to make a start
S/L2 V
supply or stop.
T/L3 W
R1/L11
∗2  Install a stepdown transformer.
S1/L21  Connect the power supply terminals R1/L11,
T ∗1 S1/L21 of the control circuit to the input side
Inverter of the MC to hold an alarm signal when the
Operation preparation inverter's protective circuit is activated. At
C1
OFF ON this time, remove jumpers across terminals
MC B1 R/L1 and R1/L11 and S/L2 and S1/L21.
A1 (Refer to page 55 for removal of the jumper.)
MC
RA
STF/STR
Start/Stop SD
MC Start
RA
Stop RA

Handling of the magnetic contactor on the inverter's output side

Switch the magnetic contactor between the inverter and motor only when both the inverter and motor are at a stop. When the
magnetic contactor is turned ON while the inverter is operating, overcurrent protection of the inverter and such will activate.
When an MC is provided to switch to a commercial power supply, for example, it is recommended to use the electronic bypass
function of Pr.135 to Pr.139 (refer to the Instruction Manual (Function)).

PRECAUTIONS FOR USE OF THE INVERTER 81

Countermeasures against deterioration of the 400 V class motor insulation

3.4 Countermeasures against deterioration of

the 400 V class motor insulation
In the PWM type inverter, a surge voltage attributable to wiring constants is generated at the motor terminals. Especially in a
400 V class motor, the surge voltage may deteriorate the insulation. When the 400 V class motor is driven by the inverter,
consider the following countermeasures:

• Countermeasures
It is recommended to take one of the following countermeasures:

• Rectifying the motor insulation and limiting the PWM carrier frequency according to the wiring length
For the 400 V class motor, use an insulation-enhanced motor.
Specifically,
- Order a "400 V class inverter-driven insulation-enhanced motor".
- For the dedicated motor such as the constant-torque motor and low-vibration motor, use an "inverter-driven dedicated
motor".
- Set Pr.72 PWM frequency selection as indicated below according to the wiring length.

Wiring length
Longer than 100 m
Pr.72 PWM frequency selection 4 (4 kHz) or lower

• Suppressing the surge voltage on the inverter side

- Connect the sine wave filter (MT-BSL/BSC) to the output side.

NOTE
• For the details of Pr.72 PWM frequency selection, refer to the Instruction Manual (Detailed). (When using an optional sine
wave filter (MT-BSL/BSC), set "25" (2.5 kHz) in Pr.72.)
• For the details of the sine wave filter (MT-BSL/BSC), refer to the Instruction Manual of each option.
• A sine wave filter (MT-BSL/BSC) can be used under V/F control. Do not use the filters under different control modes.
• The carrier frequency is limited during PM sensorless vector control. (Refer to the Instruction Manual (Detailed).)

82 PRECAUTIONS FOR USE OF THE INVERTER

 Checklist before starting operation

3.5 Checklist before starting operation

The FR-A800 series inverter is a highly reliable product, but incorrect peripheral circuit making or operation/handling method
may shorten the product life or damage the product.
Before starting operation, always recheck the following points.

Refer Check
Checkpoint Countermeasure
to page by user
Use crimp terminals with insulation sleeves to wire the power supply and
Crimp terminals are insulated. -
the motor.
The wiring between the power supply
Application of power to the output terminals (U, V, W) of the inverter will
(R/L1, S/L2, T/L3) and the motor (U, V, 35
damage the inverter. Never perform such wiring.
W) is correct.
Wire offcuts can cause an alarm, failure or malfunction. Always keep the
No wire offcuts are left from the time of inverter clean.
-
wiring. When drilling mounting holes in an enclosure etc., take caution not to
allow chips and other foreign matter to enter the inverter.
Use an appropriate cable gauge to suppress the voltage drop to 2% or
less.
The main circuit cable gauge is correctly
If the wiring distance is long between the inverter and motor, the voltage 37
selected.
drop in the main circuit will cause the motor torque to decrease
especially during the output of a low frequency.
Keep the total wiring length within the specified length.
In long distance wiring, charging currents due to stray capacitance in the
The total wiring length is within the
wiring may degrade the fast-response current limit operation or cause 37
specified length.
the equipment on the inverter's output side to malfunction. Pay attention
to the total wiring length.
The input/output (main circuit) of the inverter includes high frequency
components, which may interfere with the communication devices (such
Countermeasures are taken against
as AM radios) used near the inverter. In such case, activate the EMC 79
EMI.
filter (turn ON the EMC filter ON/OFF connector) to minimize
interference.
When a motor is driven by the inverter, axial voltage is generated on the
motor shaft, which may cause electrical corrosion of the bearing in rare
cases depending on the wiring, load, operating conditions of the motor or
specific inverter settings (high carrier frequency and built-in EMC filter
ON).
Countermeasures are taken against Contact your sales representative to take appropriate countermeasures
electrical corrosion on the motor for the motor. -
bearing. The following shows examples of countermeasures for the inverter.
• Decrease the carrier frequency.
• Turn OFF the EMC filter.
• Provide a common mode choke on the output side of the inverter. 
(This is effective regardless of the EMC filter ON/OFF connector
setting.)
On the inverter's output side, there is no Such installation will cause the inverter to trip or the capacitor and surge
power factor correction capacitor, surge suppressor to be damaged. If any of the above devices is connected, -
suppressor, or radio noise filter installed. immediately remove it.
For a short time after the power-OFF, a high voltage remains in the
When performing an inspection or
smoothing capacitor, and it is dangerous.
rewiring on the product that has been
Before performing an inspection or rewiring, wait 10 minutes or longer
energized, the operator has waited long -
after the power supply turns OFF, then confirm that the voltage across
enough after shutting off the power
the main circuit terminals P/+ and N/- of the inverter is low enough using
supply.
a tester, etc.
• A short circuit or ground fault on the inverter's output side may damage
the inverter module. 3
• Fully check the insulation resistance of the circuit prior to inverter
operation since repeated short circuits caused by peripheral circuit
The inverter's output side has no short inadequacy or a ground fault caused by wiring inadequacy or reduced
-
circuit or ground fault occurring. motor insulation resistance may damage the inverter module.
• Fully check the to-earth (ground) insulation and phase-to-phase
insulation of the inverter's output side before power-ON. Especially for
an old motor or use in hostile atmosphere, make sure to check the
motor insulation resistance, etc.

PRECAUTIONS FOR USE OF THE INVERTER 83

Checklist before starting operation

Refer Check
Checkpoint Countermeasure
to page by user
Since repeated inrush currents at power ON will shorten the life of the
The circuit is not configured to use the
converter circuit, frequent starts and stops of the magnetic contactor
inverter's input-side magnetic contactor 81
must be avoided. Turn ON/OFF the inverter's start signals (STF, STR) to
to start/stop the inverter frequently.
run/stop the inverter.
Application of a voltage higher than the permissible voltage to the
The voltage applied to the inverter I/O inverter I/O signal circuits or opposite polarity may damage the I/O
signal circuits is within the devices. Especially check the wiring to prevent the speed setting 46
specifications. potentiometer from being connected incorrectly to short circuit terminals
10E and 5.
When using a switching circuit as shown below, chattering due to mis-
configured sequence or arc generated at switching may allow
undesirable current to flow in and damage the inverter. Mis-wiring may
also damage the inverter. (The commercial power supply operation is not
available with vector control dedicated motors nor with PM motors.)
MC1
When using the electronic bypass Interlock
operation, electrical and mechanical Power R/L1 U
interlocks are provided between the supply IM -
S/L2 V MC2
electronic bypass contactors MC1 and
MC2. T/L3 W
Undesirable current
Inverter
If switching to the commercial power supply operation while a failure
such as an output short circuit has occurred between the magnetic
contactor MC2 and the motor, the damage may further spread. If a
failure has occurred between the MC2 and the motor, a protection circuit
such as using the OH signal input must be provided.
If the machine must not be restarted when power is restored after a
power failure, provide an MC in the inverter's input side and also make
A countermeasure is provided for power
up a sequence which will not switch ON the start signal. If the start signal -
restoration after a power failure.
(start switch) remains ON after a power failure, the inverter will
automatically restart as soon as the power is restored.
The encoder must be directly connected to a motor shaft without any
When using vector control, the encoder
backlash. (Real sensorless vector control, PM sensorless vector control 64
is properly installed.
do not require an encoder.)
On the inverter's input side, connect an MC for the following purposes:
• To disconnect the inverter from the power supply at activation of a
protective function or at malfunctioning of the driving system
(emergency stop, etc.).
• To prevent any accident due to an automatic restart at power
A magnetic contactor (MC) is installed
restoration after an inverter stop made by a power failure. 81
on the inverter's input side.
• To separate the inverter from the power supply to ensure safe
maintenance and inspection work.
If using an MC for emergency stop during operation, select an MC
regarding the inverter input side current as JEM1038-AC-3 class rated
current.
The magnetic contactor on the inverter's Switch the magnetic contactor between the inverter and motor only when
81
output side is properly handled. both the inverter and motor are at a stop.
When a failure occurs between the MC2 and motor, make sure to
provide a protection circuit, such as using the OH signal input.
When using a PM motor, a low-voltage
In an application, such as fan and blower, where the motor is driven by
manual contactor is installed on the 81
the load, a low-voltage manual contactor must be connected at the
inverter's output side.
inverter's output side, and wiring and inspection must be performed
while the contactor is open. Otherwise you may get an electric shock.
If electromagnetic noise generated from the inverter causes frequency
setting signal to fluctuate and the motor rotation speed to be unstable
when changing the motor speed with analog signals, the following
countermeasures are effective:
• Do not run the signal cables and power cables (inverter I/O cables) in
An EMI countermeasure is provided for
parallel with each other and do not bundle them. 77
the frequency setting signals.
• Run signal cables as far away as possible from power cables (inverter
I/O cables).
• Use shielded cables.
• Install a ferrite core on the signal cable (Example: ZCAT3035-1330 by
TDK).

84 PRECAUTIONS FOR USE OF THE INVERTER

 Checklist before starting operation

Refer Check
Checkpoint Countermeasure
to page by user
When performing frequent starts/stops by the inverter, rise/fall in the
temperature of the transistor element of the inverter will repeat due to a
repeated flow of large current, shortening the life from thermal fatigue.
Since thermal fatigue is related to the amount of current, the life can be
A countermeasure is provided for an increased by reducing current at locked condition, starting current, etc.
-
overload operation. Reducing current may extend the service life but may also cause torque
shortage, which leads to a start failure. Adding a margin to the current
can eliminate such a condition. For an induction motor, use an inverter of
a higher capacity (up to two ranks). For a PM motor, use an inverter and
PM motor of higher capacities.
The specifications and rating match the Make sure that the specifications and rating match the system
106
system requirements. requirements.
 Recommended common mode choke: FT-3KM F series FINEMET® common mode choke cores manufactured by Proterial, Ltd.
FINEMET is a registered trademark of Proterial, Ltd.

PRECAUTIONS FOR USE OF THE INVERTER 85

Failsafe system which uses the inverter

3.6 Failsafe system which uses the inverter

When a fault is detected by the protective function, the protective function activates and outputs a fault signal. However, a
fault signal may not be output at an inverter's fault occurrence when the detection circuit or output circuit fails, etc. Although
Mitsubishi assures the best quality products, provide an interlock which uses inverter status output signals to prevent
accidents such as damage to the machine when the inverter fails for some reason. Also at the same time consider the system
configuration where a failsafe from outside the inverter, without using the inverter, is enabled even if the inverter fails.

Interlock method which uses the inverter status output signals

By combining the inverter output signals to provide an interlock as shown below, an inverter failure can be detected.

No. Interlock method Check method Used signals

Operation check of an alarm contact.
a Inverter protective function operation Fault (ALM) signal
Circuit error detection by negative logic.
b Inverter operating status Operation ready signal check. Inverter operation ready (RY) signal
Logic check of the start signal and running Start signal (STF/STR signal)
c Inverter running status
signal. Inverter running (RUN) signal
Logic check of the start signal and output Start signal (STF/STR signal)
d Inverter running status
current. Output current detection (Y12) signal

(a) Checking by the output of the inverter fault signal

Output frequency

When the inverter's protective function activates and Inverter fault occurrence
(trip)
the inverter trips, the Fault (ALM) signal is output. (The
ALM signal is assigned to terminal A1B1C1 in the
initial setting).
With this signal, check that the inverter operates ALM
Time
ON OFF
properly. (when output
at NC contact)
In addition, negative logic can be set. (ON when the ON OFF
RES
Reset processing
inverter is normal, OFF when the fault occurs.) (about 1 s)
Reset ON
(b) Checking the inverter operating status by the inverter
operation ready completion signal Power ON OFF
The Inverter operation ready (RY) signal is output supply
ON OFF
STF
when the inverter power is ON and the inverter
ON
becomes operative. Check if the RY signal is output RH
after powering ON the inverter.
Output frequency

DC injection brake
operation point
(c) Checking the inverter operating status by the start DC injection
signal input to the inverter and inverter running signal brake operation
Pr. 13 Starting
The Inverter running (RUN) signal is output when the frequency
Reset
inverter is running. (The RUN signal is assigned to processing
Time
terminal RUN in the initial setting.)
ON OFF
Check if the RUN signal is being output while inputting a RY
RUN ON OFF
start signal to the inverter. (The STF signal is a forward
rotation signal, and the STR is a reverse rotation
signal.) Even after the start signal is turned OFF, the
RUN signal is kept output until the inverter makes the
motor to decelerate and to stop. For the logic check,
configure a sequence considering the inverter's
deceleration time.

86 PRECAUTIONS FOR USE OF THE INVERTER

 Failsafe system which uses the inverter

(d) Checking the motor operating status by the start signal input to the inverter and inverter output current detection signal
The Output current detection (Y12) signal is output when the inverter operates and currents flows into the motor.
Check if the Y12 signal is being output while inputting a start signal to the inverter. (The STF signal is a forward rotation
signal, and the STR is a reverse rotation signal.) The Y12 signal is initially set to be output at 150% inverter rated
current. Adjust the level to around 20% using no load current of the motor as reference with Pr.150 Output current
detection level.
Like the Inverter running (RUN) signal, even after the start signal is turned OFF, the Y12 signal is kept output until the
inverter stops the output to a decelerating motor. For the logic check, configure a sequence considering the inverter's
deceleration time.
• When using various signals, assign the functions to Pr.190 and
Output Pr.190 to Pr.196 setting Pr.196 (Output terminal function selection) referring to the
signal Positive logic Negative logic table on the left.
ALM 99 199
RY 11 111
RUN 0 100
Y12 12 112

NOTE
• Changing the terminal assignment using Pr.190 and Pr.196 (Output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
• For the details on the parameters and signals, refer to the Instruction Manual (Detailed).

Backup method outside the inverter

Even if the interlock is provided by the inverter status signal, enough failsafe is not ensured depending on the failure status of
the inverter itself. For example, when the inverter CPU fails, even if the interlock is provided using the inverter Fault signal,
start signal and RUN signal, there is a case where a Fault signal is not output and RUN signal is kept output even if an inverter
fault occurs.
Provide a speed detector to detect the motor speed and current detector to detect the motor current and consider the backup
system such as performing a check as below according to the level of importance of the system.

(a) Start signal and actual operation check

Check the motor running and motor current while the start signal is input to the inverter by comparing the start signal to
the inverter and detected speed of the speed detector or detected current of the current detector. Note that the current
is flowing through the motor while the motor coasts to stop, even after the inverter's start signal is turned OFF. For the
logic check, configure a sequence considering the inverter's deceleration time. In addition, it is recommended to check
the three-phase current when using the current detector.

(b) Command speed and actual operation check

Check for a gap between the actual speed and commanded speed by comparing the inverter's speed command and
the speed detected by the speed detector.

Controller

System failure

Inverter Sensor
(speed, temperature,
air volume, etc.)

To the alarm detection sensor

PRECAUTIONS FOR USE OF THE INVERTER 87

MEMO

88
 4 PRECAUTIONS FOR
MAINTENANCE AND
INSPECTION

This chapter explains the precautions for maintenance and inspection for
this product.
Always read the instructions before use.

4.1 Inspection item..........................................................................90

4.2 Measurement of main circuit voltages, currents, and powers .99

PRECAUTIONS FOR MAINTENANCE AND INSPECTION 89

Inspection item

The inverter is a static unit mainly consisting of semiconductor devices. Daily inspection must be performed to prevent any
fault from occurring due to the adverse effects of the operating environment, such as temperature, humidity, dust, dirt and
vibration, changes in the parts with time, service life, and other factors.

Precautions for maintenance and inspection

When accessing the inverter for inspection, wait for at least 10 minutes after the power supply has been switched OFF, and
then make sure that the voltage across the main circuit terminals P/+ and N/- of the inverter is not more than 30 VDC using a
tester, etc.

4.1 Inspection item

4.1.1 Daily inspection

Basically, check for the following faults during operation.
• Motor operation fault
• Improper installation environment
• Cooling system fault
• Abnormal vibration, abnormal noise
• Abnormal overheat, discoloration

4.1.2 Periodic inspection

Check the areas inaccessible during operation and requiring periodic inspection.
Consult us for periodic inspection.
• Check and clean the cooling system. ............... Clean the air filter, etc.
• Check the tightening and retighten. .................. The screws and bolts may become loose due to vibration, temperature
changes, etc. Check and tighten them.
Tighten them according to the specified tightening torque. (Refer to page
37.)
• Check the conductors and insulating materials for corrosion and damage.
• Measure the insulation resistance.
• Check and change the cooling fan and relay.

NOTE
• When using the safety stop function, periodic inspection is required to confirm that safety function of the safety system
operates correctly.
For more details, refer to the Safety Stop Function Instruction Manual.

90 PRECAUTIONS FOR MAINTENANCE AND INSPECTION

 Inspection item

4.1.3 Daily and periodic inspection

Inspection
Corrective action Check
Area of interval
Inspection item Description at fault by the
inspection Periodic
Daily occurrence user


Surrounding Check the surrounding air temperature, humidity, Improve the


environment dirt, corrosive gas, oil mist, etc. environment.
Check fault location
Check for unusual vibration and noise. 
General Overall unit and retighten.
Check for dirt, oil, and other foreign material.  Clean.
Power supply Check that the main circuit voltages and control Inspect the power

voltage voltages are normal. supply.
(1)Check with megger (across main circuit terminals Contact the

and earth (ground) terminal). manufacturer.
(2)Check for loose screws and bolts.  Retighten.
General
Contact the
(3)Check for overheat traces on the parts. 
manufacturer.
(4)Check for stain.  Clean.
Contact the
(1)Check conductors for distortion. 
manufacturer.
Conductors, cables
(2)Check cable sheaths for breakage and Contact the

deterioration (crack, discoloration, etc.). manufacturer.
Stop the equipment
Transformer/ Check for unusual odor and abnormal increase of
 and contact the
reactor whining sound.
manufacturer.
Main Stop the equipment
circuit Terminal block Check for a damage.  and contact the
manufacturer.
Contact the
(1)Check for liquid leakage. 
Smoothing manufacturer.
aluminum Contact the
(2)Check for safety valve projection and bulge. 
electrolytic manufacturer.
capacitor (3)Visual check and judge by the life check of the

main circuit capacitor. (Refer to page 94.)
Check that the operation is normal and no Contact the
Relay/contactor 
chattering sound is heard. manufacturer.
Contact the
(1)Check for crack in resistor insulation. 
manufacturer.
Resistor
Contact the
(2)Check for a break in the cable. 
manufacturer.
(1)Check that the output voltages across phases are Contact the

balanced while operating the inverter alone. manufacturer.
Operation check (2)Check that no fault is found in protective and
Contact the
display circuits in a sequence protective operation 
manufacturer.
test.
Control Stop the equipment
circuit, (1)Check for unusual odor and discoloration.  and contact the
Components check

protective Overall manufacturer.

circuit Contact the
(2)Check for serious rust development. 
manufacturer.
(1)Check for liquid leakage in a capacitor and Contact the
Aluminum 
deformation trace. manufacturer.
electrolytic
(2)Visual check and judge by the life check of the
capacitor 
control circuit capacitor. (Refer to page 94.)
(1)Check for unusual vibration and noise.  Replace the fan.
Fix with the fan
4
Cooling fan (2)Check for loose screws and bolts. 
Cooling cover fixing screws
system (3)Check for stain.  Clean.
(1)Check for clogging.  Clean.
Heatsink
(2)Check for stain.  Clean.
Check fault location
Coolant
Joint Check for liquid leakage.  (joint or hose bind)
pipe
and retighten.

PRECAUTIONS FOR MAINTENANCE AND INSPECTION 91

Inspection item

Inspection
Corrective action Check
Area of interval
Inspection item Description at fault by the
inspection Periodic
Daily occurrence user


Improve the water

Coolant
quality.
cooling Water quality Check for problems with water quality. 
Contact the
system
manufacturer.
Contact the
(1)Check that display is normal. 
Indication manufacturer.
(2)Check for stain.  Clean.
Display
Stop the equipment
Meter Check that reading is normal.  and contact the
manufacturer.
Stop the equipment
Load Check for vibration and abnormal increase in
Operation check  and contact the
motor operation noise.
manufacturer.
 Oil component of the heat dissipation grease used inside the inverter may leak out. The oil component, however, is not flammable, corrosive, nor
conductive and is not harmful to humans. Wipe off such oil component.
 It is recommended to install a voltage monitoring device for checking the voltage of the power supplied to the inverter.
 One to two years of periodic inspection cycle is recommended. However, it differs according to the installation environment.
Consult us for periodic inspection.

NOTE
• Continuous use of a leaked, deformed, or degraded smoothing aluminum electrolytic capacitor (as shown in the table above)
may lead to a burst, breakage or fire. Replace such a capacitor without delay.

92 PRECAUTIONS FOR MAINTENANCE AND INSPECTION

 Inspection item

4.1.4 Continuity test of the inverter and converter

modules
Preparation
• Disconnect the external power cables from terminals R/L1, S/L2, and T/L3, and motor cables from terminals U, V, and W.
• Prepare a continuity tester. (For the resistance measurement, use the 100 Ω range.)

Checking method
Change the polarity of the tester alternately at a semiconductor device (transistor) on an electrical path between two terminals
among the inverter main circuit terminals R/L1, S/L2, T/L3, U, V, W, P/+ and N/- to check the electric continuity.

NOTE
• Before measurement, check that the smoothing capacitor is discharged.
• At the time of electric discontinuity, the measured value is almost . When there is an instantaneous electric continuity, due to
the smoothing capacitor, the tester may not indicate . At the time of electric continuity, the measured value is several Ω to
several tens of Ω. If all measured values are almost the same, although these values are not constant depending on the
module type and tester type, the modules are without fault.

Device number and target terminal on each module

Tester Tester Converter module P/+ Inverter module
polarity Continuity polarity Continuity TR1 TR3 TR5
D1 D2 D3
R/L1 P/+ No R/L1 N/- Yes
Inverter module Converter module

D1 D4
P/+ R/L1 Yes N/- R/L1 No R/L1 C
U
S/L2 P/+ No S/L2 N/- Yes
D2 D5 S/L2 V
P/+ S/L2 Yes N/- S/L2 No
T/L3 P/+ No T/L3 N/- Yes T/L3 W
D3 D6
P/+ T/L3 Yes N/- T/L3 No
U P/+ No U N/- Yes
TR1 TR4 D4 D5 D6
P/+ U Yes N/- U No
TR4 TR6 TR2
V P/+ No V N/- Yes
TR3 TR6 N/−
P/+ V Yes N/- V No
W P/+ No W N/- Yes
TR5 TR2
P/+ W Yes N/- W No
(Assumes the use of an analog meter.)

4.1.5 Cleaning
Always run the inverter in a clean status.
When cleaning the inverter, gently wipe dirty areas with a soft cloth immersed in neutral detergent or ethanol.

NOTE
• Do not use solvent, such as acetone, benzene, toluene and alcohol, as these will cause the inverter surface paint to peel off.
• The display, etc. of the operation panel (FR-DU08) and parameter unit (FR-PU07) are vulnerable to detergent and alcohol.
Therefore, avoid using them for cleaning.

PRECAUTIONS FOR MAINTENANCE AND INSPECTION 93

Inspection item

4.1.6 Replacement of parts

The inverter consists of many electronic parts such as semiconductor devices.
The following parts may deteriorate with age because of their structures or physical characteristics, leading to reduced
performance or fault of the inverter. For preventive maintenance, the parts must be replaced periodically.
Use the life check function as a guidance of parts replacement.

Part name Estimated lifespan Description

Cooling fan 87600 hours Replace (as required)
FR-A840-03250(110K)
87600 hours Replace (as required)
to 04810(185K)
Main circuit smoothing capacitor
FR-A840-05470(220K)
20000 hours Replace (as required)
to 06830(280K)
On-board smoothing capacitor 87600 hours Replace the board (as required)
Main circuit fuse 87600 hours Replace (as required)
Water-cooled heatsink 21900 hours Replace
 Estimated lifespan for when the yearly average surrounding air temperature is 40°C.
(without corrosive gas, flammable gas, oil mist, dust and dirt etc.)
 Consider the usage condition of the coolant and others for replacement.

NOTE
• For parts replacement, contact the nearest Mitsubishi FA center.

Displaying the life of the inverter parts

The inverter diagnoses the main circuit capacitor, control circuit capacitor, cooling fan, and inrush current limit circuit by itself
and estimates their lives.
The self-diagnostic warning is output when the life span of each part is near its end. It gives an indication of replacement time.
Guideline for life judgment by the life warning output
Parts Judgment level
Main circuit capacitor 85% of the initial capacity
Control circuit capacitor Estimated remaining life 10%
Inrush current limit circuit Estimated remaining life 10% (Power ON: 100,000 times left)
Cooling fan Specified speed

NOTE
• Refer to the Instruction Manual (Detailed) to perform the life check of the inverter parts.

94 PRECAUTIONS FOR MAINTENANCE AND INSPECTION

 Inspection item

Replacement procedure of the cooling fan

The replacement interval of the cooling fan used for cooling the parts generating heat such as the main circuit semiconductor
is greatly affected by the surrounding air temperature. When unusual noise and/or vibration are noticed during inspection, the
cooling fan must be replaced immediately.

 Removal (FR-A840-03250(110K) or FR-A840-03610(132K))

1) Push the hooks from above and remove the fan cover.

2) Disconnect the fan connector.

3) Pull out the fan.

Fan cover

Fan connector

 Reinstallation (FR-A840-03250(110K) or FR-A840-03610(132K))

1) Before installing the new fan, check the orientation of the fan to be sure that the "AIR FLOW" arrow printed on the side
of the fan points upward.

AIR FLOW

[Fan side view]

2) Reconnect the fan connector.

3) Fit the fan cover.

1. Insert hooks into holes.

2. Press down the cover to
snap it into place.

PRECAUTIONS FOR MAINTENANCE AND INSPECTION 95

Inspection item

 Removal (FR-A840-04320(160K) to FR-A840-06830(280K))

1) Remove the fan cover fixing screws, and remove the fan cover.
2) Disconnect the fan connector and remove the fan block.
3) Remove the fan fixing screws, and remove the fan.

Fan

3) Fan block

Fan cover
2)

Fan connector

1)

 Reinstallation (FR-A840-04320(160K) to FR-A840-06830(280K))

1) Before installing the new fan, check the orientation of the fan to be sure that the "AIR FLOW" arrow printed on the side
of the fan points upward.

AIR FLOW

[Fan side view]

2) Install fans referring to the above figure.

NOTE
• Installing the fan in the opposite air flow direction can cause the inverter life to be shorter.
• Prevent the cable from being caught when installing a fan.
• Switch the power OFF before replacing fans. To prevent an electric shock accident, power off the inverter and wait for at least
10 minutes as the inverter circuits are charged with voltage even after power OFF. Check that the charge lamp is OFF before
starting the replacement.

96 PRECAUTIONS FOR MAINTENANCE AND INSPECTION

 Inspection item

Smoothing capacitors
A large-capacity aluminum electrolytic capacitor is used for smoothing in the main circuit DC section, and an aluminum
electrolytic capacitor is used for stabilizing the control power in the control circuit. Their characteristics are deteriorated by the
adverse effects of ripple currents, etc. The replacement intervals greatly vary with the surrounding air temperature and
operating conditions. When the inverter is operated in air-conditioned, normal environment conditions, replace the capacitors
about every 87600 hours.
End of life appearance criteria are as follows:
• Case: Check the side and bottom faces for expansion.
• Sealing plate: Check for remarkable warp and extreme crack.
• Others: Check for external crack, discoloration, liquid leakage, etc.
End of life performance criterion is the measured capacitance of the capacitor reduced below 80% of the rating.

NOTE
• The inverter diagnoses the main circuit capacitor and control circuit capacitor by itself and can judge their lives. (Refer to the
Instruction Manual (Detailed).)

Relays
• To prevent a contact fault, etc., relays must be replaced according to the cumulative number of switching times (switching life).
• The control terminal block must be replaced in case of failure of either relay between the relay output terminals C1 and B1
or A1, or terminals C2 and B2 or A2.

Main circuit fuse inside the inverter

A fuse is used inside the inverter. Surrounding air temperature and operating condition affect the life of fuses. When the
inverter is used in a normal air-conditioned environment, replace its fuse after about 87600 hours.

4.1.7 Removal and reinstallation of the control circuit

terminal block
The FR-A800 series inverter has a removable control circuit terminal block, which can be replaced with a new one or a control
terminal option.

Removal and reinstallation

1) Loosen the two mounting screws at the both side of the control circuit terminal block. (These screws cannot be removed.)
Slide down the control circuit terminal block to remove it.

Loosen the screws

4
2) Be careful not to bend the pins of the inverter's control circuit connector, reinstall the control circuit terminal block and fix it
with the mounting screws.

NOTE
• Before starting inverter replacement, switch power OFF, wait for at least 10 minutes, and then check the voltage with a tester
and such to ensure safety.

PRECAUTIONS FOR MAINTENANCE AND INSPECTION 97

Inspection item

Removal and reinstallation precautions

Precautions to be taken when removing or reinstalling the control circuit terminal block are shown below.
Observe the following precautions and handle the inverter properly to avoid malfunctions or failures.
• To remove or reinstall the control circuit terminal block, keep it upright so that it is parallel with the inverter.
• To install the control circuit terminal block, slide it upward so that the tongues on the inverter slot into the grooves on the
terminal block.
• Check that the terminal block is parallel to the inverter and the pins on the inverter control circuit connector are not bent.
After checking proper connection, fix the terminal block in place with two screws.

Inverter's control Control circuit terminal block

circuit connector
Slot the tongue into the groove.

Tighten the screws.

A
Control circuit terminal block
Inverter's control
circuit connector

Insert the
terminal block
parallel to the
inverter.

View from side A

NOTE
• Do not tilt the terminal block while tightening the screws or removing it from the inverter. (Otherwise, stress applied to the
control circuit terminal block or the control circuit connector may damage the pins.)
• After replacing the control terminal block, connect the jumper connector to the correct position in accordance with the control
logic of input signals. (Refer to page 50.)

98 PRECAUTIONS FOR MAINTENANCE AND INSPECTION

 Measurement of main circuit voltages, currents, and powers

4.2 Measurement of main circuit voltages,

currents, and powers
Since the voltages and currents on the inverter power supply and output sides include harmonics, measurement data
depends on the instruments used and circuits measured.
When instruments for commercial frequency are used for measurement, measure the following circuits with the instruments
given on the next page.

NOTE
• When installing meters etc. on the inverter output side:
When the inverter-to-motor wiring length is long, the meters and CT meters may generate heat due to line-to-line leakage
current. Therefore, choose the equipment which has enough allowance for the current rating.
To measure and display the output voltage and output current of the inverter, it is recommended to use terminal AM and FM/
CA output functions of the inverter.

Examples of measuring points and instruments

Input voltage Output voltage

Input current
Output current

Inverter

Ar W11 R/L1 U Au W21

Vr Vu
Three-phase
power supply As W12 S/L2 V Av To the motor
Vs Vv
At W13 T/L3 W Aw W22
Vt Vw
P/+ N/-
: Moving-iron type

: Electrodynamometer type
V
+ - : Moving-coil type
Instrument
types : Rectifier type

PRECAUTIONS FOR MAINTENANCE AND INSPECTION 99

Measurement of main circuit voltages, currents, and powers

Measuring points and instruments

Item Measuring point Measuring instrument Remarks (reference measured value)
Across terminals
Commercial power supply
Input voltage R/L1 and S/L2,
Moving-iron AC voltmeter Within permissible AC voltage fluctuation
V1 S/L2 and T/L3, and
(Refer to page 106.)
T/L3 and R/L1
Line current at
Input current
terminals Moving-iron AC ammeter
I1
R/L1, S/L2, and T/L3
At terminals R/L1,
S/L2, and T/L3 and
Digital power meter (for inverter) or
Input power across terminals
electrodynamic single-phase P1 = W11 + W12 + W13 (3-wattmeter method)
P1 R/L1 and S/L2,
wattmeter
S/L2 and T/L3, and
T/L3 and R/L1
Calculate after measuring input voltage, input current, and input power.
Input power factor P1
Pf1 Pf 1 = ------------------------  100 %
3V 1  I 1

Rectifier AC voltage meter

Output voltage Across U and V, V Difference between the phases must be within 1% of
(moving-iron voltmeter not
V2 and W, and W and U the maximum output voltage.
available)
Line current at Each current must be equal to or lower than the
Output current
terminals U, V and Moving-iron AC ammeter inverter rated current. Difference between the phases
I2
W must be within 10%.
At terminals U, V,
Digital power meter (for inverter) or
Output power and W and across P2 = W21 + W22
electrodynamic single-phase
P2 terminals U and V, 2-wattmeter method (or 3-wattmeter method)
wattmeter
and V and W
Calculate in similar manner to input power factor.
Output power factor
P2
Pf2 Pf 2 = ------------------------  100 %
3V 2  I 2
Across terminals P/+ Moving-coil type instrument A measured value can be monitored on the PU.
Converter output
and N/- (such as tester) Reference value: 1.35 × V1
Across terminals 2,
0 to 10 VDC, 4 to 20 mA
Frequency setting 4(+) and 5
signal Across terminals
0 to ±5 VDC and 0 to ±10 VDC
1(+) and 5
Across terminals
5.2 VDC
Frequency setting 10(+) and 5 Terminal
power supply Across terminals 5 is
10 VDC
10E(+) and 5 common
Approximately 10 VDC at maximum
Across terminals
frequency
AM(+) and 5
(without frequency meter)
Across terminals Approximately 20 mADC at maximum
CA(+) and 5 frequency
Approximately 5 VDC at maximum
Moving-coil type instrument
frequency
(tester and such may be used with
Frequency meter (without frequency meter)
internal resistance 50 kΩ or more)
signal T1

Across terminals
8 VDC
FM(+) and SD

T2 Terminal
Pulse width T1: Adjust with C0 (Pr.900). SD is
Pulse cycle T2: Set with Pr.55. common
(frequency monitor only)
Across terminals
Start signal STF, STR, RH, RM,
Voltage when terminal is open:
Select signal RL, JOG, RT, AU,
20 to 30VDC
Reset signal STP (STOP), CS,
Voltage when signal is ON: 1 V or less
Output stop signal RES, MRS(+) and
SD (for sink logic)

100 PRECAUTIONS FOR MAINTENANCE AND INSPECTION

 Measurement of main circuit voltages, currents, and powers

Item Measuring point Measuring instrument Remarks (reference measured value)

Across terminals A1 Continuity test result
and C1 Moving-coil type instrument [Normal] [Fault]
Fault signal
Across terminals B1 (such as tester) Across terminals A1 and C1 Discontinuity Continuity
and C1 Across terminals B1 and C1 Continuity Discontinuity
 Use an FFT to measure the output voltage accurately. A tester or general measuring instrument cannot measure accurately.
 When the carrier frequency exceeds 5 kHz, do not use this instrument since using it may increase eddy current losses produced in metal parts
inside the instrument, leading to burnout. In this case, use an approximate-effective value type.
 When the setting of Pr.195 ABC1 terminal function selection is the positive logic
 A digital power meter (designed for inverter) can also be used to measure.

PRECAUTIONS FOR MAINTENANCE AND INSPECTION 101

Measurement of main circuit voltages, currents, and powers

4.2.1 Measurement of powers

Use digital power meters (for inverter) for the both of inverter input and output side. Alternatively, measure using
electrodynamic type single-phase wattmeters for the both of inverter input and output side in two-wattmeter or three-
wattmeter method. As the current is liable to be imbalanced especially in the input side, it is recommended to use the three-
wattmeter method.
Examples of measured value differences produced by different measuring meters are shown below.
An error will be produced by difference between measuring instruments, e.g. power calculation type and two- or three-
wattmeter type three-phase wattmeter. When a CT is used in the current measuring side or when the meter contains a PT on
the voltage measurement side, an error will also be produced due to the frequency characteristics of the CT and PT.

[Measurement conditions] [Measurement conditions]

Constant output of 60 Hz or more frequency with a constant- Constant output of 60 Hz or more frequency with a constant-
torque (100%). The value obtained by the 3-wattmeter torque (100%). The value obtained by the 3-wattmeter
method with a 4-pole 3.7 kW induction motor is assumed to method with a 4-pole 3.7 kW induction motor is assumed to
be 100%. be 100%.
% %
120 120

100 100

80 3-wattmeter method (Electro-dynamometer type) 80 3-wattmeter method (Electro-dynamometer type)

2-wattmeter method (Electro-dynamometer type) 2-wattmeter method (Electro-dynamometer type)
Clip AC power meter Clip AC power meter
(For balanced three-phase load) (For balanced three-phase load)
60 Clamp-on wattmeter 60 Clamp-on wattmeter
(Hall device power arithmetic type) (Hall device power arithmetic type)

0 20 40 60 80 100 120 Hz 0 20 40 60 80 100 120 Hz

Example of measuring inverter input power Example of measuring inverter output power

4.2.2 Measurement of voltages and use of PT

Inverter input side
As the input side voltage has a sine wave and it is extremely small in distortion, accurate measurement can be made with an
ordinary AC meter.

Inverter output side

Since the output side voltage has a PWM-controlled rectangular wave, always use a rectifier type voltmeter. A needle type
tester cannot be used to measure the output side voltage as it indicates a value much greater than the actual value. A moving-
iron type meter indicates an effective value which includes harmonics and therefore the value is larger than that of the
fundamental wave. The value monitored on the operation panel is the inverter-controlled voltage itself. Hence, that value is
accurate and it is recommended to monitor values (analog output) using the operation panel.

PT
No PT can be used in the output side of the inverter. Use a direct-reading meter. (A PT can be used in the input side of the
inverter.)

102 PRECAUTIONS FOR MAINTENANCE AND INSPECTION

 Measurement of main circuit voltages, currents, and powers

4.2.3 Measurement of currents

Use moving-iron type meters on both the input and output sides of the inverter. However, if the carrier frequency exceeds 5
kHz, do not use that meter since an overcurrent losses produced in the internal metal parts of the meter will increase and the
meter may burn out. In this case, use an approximate-effective value type.
Since current on the inverter input side tends to be unbalanced, measurement of three phases is recommended. Correct
value cannot be obtained by measuring only one or two phases. On the other hand, the unbalanced ratio of each phase of the
output side current should be within 10%.
When a clamp ammeter is used, always use an effective value detection type. A mean value detection type produces a large
error and may indicate an extremely smaller value than the actual value. The value monitored on the operation panel is
accurate if the output frequency varies, and it is recommended to monitor values (provide analog output) using the operation
panel.
Examples of measured value differences produced by different measuring meters are shown below.

[Measurement conditions] [Measurement conditions]

Indicated value of the moving-iron type ammeter is 100%. Indicated value of the moving-iron type ammeter is 100%.
% %
120 Clip AC 120 Clip AC
power meter
Moving-iron power meter
type Moving-iron type
100 100

80 80 Clamp meter
Clamp-on wattmeter
current measurement
60 60
Clamp meter Clamp-on wattmeter
current measurement

0 20 40 60 Hz 0 20 40 60 Hz
Example of measuring inverter input current Example of measuring inverter output current

4.2.4 Use of CT and transducer

A CT may be used in both the input and output sides of the inverter. Use the one with the largest possible VA ability because
an error will increase if the frequency gets lower.
When using a transducer, use the effective value calculation type which is immune to harmonics.

4.2.5 Measurement of inverter input power factor

Calculate using effective power and apparent power. A power-factor meter cannot indicate an exact value.

Effective power
Total power factor of the inverter =
Apparent power
Three-phase input power found by the 3-wattmeter method
=
3  V (power supply voltage) I (input current effective value)

4.2.6 Measurement of converter output voltage

(across terminals P and N)
The output voltage of the converter is output across terminals P and N and can be measured with a moving-coil type meter
(tester). Although the voltage varies according to the power supply voltage, approximately 540 to 600 V is output when no 4
load is connected and voltage decreases during driving load operation.
When energy is regenerated from the motor during deceleration, for example, the converter output voltage rises to nearly 800
to 900 V maximum.

PRECAUTIONS FOR MAINTENANCE AND INSPECTION 103

Measurement of main circuit voltages, currents, and powers

4.2.7 Measurement of inverter output frequency

In the initial setting of the FM-type inverter, a pulse train proportional to the output frequency is output across the pulse train
output terminals FM and SD of the inverter. This pulse train output can be counted by a frequency counter, or a meter
(moving-coil type voltmeter) can be used to read the mean value of the pulse train output voltage. When a meter is used to
measure the output frequency, approximately 5 VDC is indicated at the maximum frequency.
For detailed specifications of the pulse train output terminal FM, refer to the Instruction Manual (Function).
In the initial setting of the CA-type inverter, a pulse train proportional to the output frequency is output across the analog
current output terminals CA and 5 of the inverter. Measure the current using an ammeter or tester.
For detailed specifications of the analog current output terminal CA, refer to the Instruction Manual (Function).

4.2.8 Insulation resistance test using megger

• For the inverter, conduct the insulation resistance test on the main circuit only as shown below and do not perform the test
on the control circuit. (Use a 500 VDC megger.)

NOTE
• Before performing the insulation resistance test on the external circuit, disconnect the cables from all terminals of the inverter
so that the test voltage is not applied to the inverter.
• For the continuity test of the control circuit, use a tester (high resistance range) and do not use the megger or buzzer.

Motor
Power R/L1 Inverter U
S/L2 V IM
supply
T/L3 W

500 VDC
megger

4.2.9 Withstand voltage test

Do not conduct a withstand voltage test. Deterioration may occur.

104 PRECAUTIONS FOR MAINTENANCE AND INSPECTION

 5 SPECIFICATIONS

This chapter explains the specifications of this product.

Always read the instructions before use.

5.1 Inverter rating............................................................................106

5.2 Common specifications ...........................................................107
5.3 Inverter outline dimensions .....................................................109

SPECIFICATIONS 105
Inverter rating

5.1 Inverter rating

03250 03610 04320 04810 05470 06100 06830
Model FR-A840-[ ]-LC
110K 132K 160K 185K 220K 250K 280K
Applicable motor capacity LD 132 160 185 220 250 280 315
(kW) ND (initial setting) 110 132 160 185 220 250 280
Rated capacity LD 198 248 275 329 367 417 465
(kVA) ND (initial setting) 165 198 248 275 329 367 417
LD 260 325 361 432 481 547 610
Rated current (A)
ND (initial setting) 216 260 325 361 432 481 547
120% 60 s, 150% 3 s (inverse-time characteristics) at surrounding air
Output

LD
Overload current temperature 50°C
rating 150% 60 s, 200% 3 s (inverse-time characteristics) at surrounding air
ND (initial setting)
temperature 50°C
Rated voltage Three-phase 380 to 500 V
Brake transistor FR-BU2 (Option)
Regenerative braking
Maximum brake torque 10% torque/continuous
Rated input
Three-phase 380 to 500 V 50/60Hz
AC voltage/frequency
Power supply

Permissible AC voltage fluctuation 323 to 550V 50/60Hz

Permissible frequency fluctuation ±5%
Rated input current LD 260 325 361 432 481 547 610
(A) ND (initial setting) 216 260 325 361 432 481 547
Power supply capacity LD 198 248 275 329 367 417 465
(kVA) ND (initial setting) 165 198 248 275 329 367 417
Protective structure (IEC 60529) Open type (IP00)
Cooling system Liquid cooling + forced air cooling
Approx. mass (kg) 83 83 124 124 172 172 172
 The applicable motor capacity indicated is the maximum capacity applicable for use of the Mitsubishi Electric 4-pole standard motor.
 The rated output capacity indicated assumes that the output voltage is 440 V.
 The % value of the overload current rating indicated is the ratio of the overload current to the inverter's rated output current. For repeated duty,
allow time for the inverter and motor to return to or below the temperatures under 100% load.
 The maximum output voltage does not exceed the power supply voltage. The maximum output voltage can be changed within the setting range.
However, the maximum point of the voltage waveform at the inverter output side is the power supply voltage multiplied by about .
 Value for the ND rating
 For the power voltage exceeding 480 V, set Pr.977 Input voltage mode selection. (For details, refer to the FR-A800 Instruction Manual
(Detailed).)
 The rated input current indicates a value at a rated output voltage. The impedance at the power supply side (including those of the input reactor
and cables) affects the rated input current.
 The power supply capacity is the value when at the rated output current. It varies by the impedance at the power supply side (including those of
the input reactor and cables).
 FR-DU08: IP40 (except for the PU connector section).

106 SPECIFICATIONS
 Common specifications

5.2 Common specifications

Soft-PWM control, high carrier frequency PWM control (selectable among V/F control, Advanced magnetic flux vector
Control method
control, Real sensorless vector control), vector control, and PM sensorless vector control.
0.2 to 590 Hz (The upper-limit frequency is 400 Hz under Advanced magnetic flux vector control, Real sensorless vector
Output frequency range
control, vector control, and PM sensorless vector control.)
Frequency Analog 0.015 Hz/60 Hz (0 to 10 V/12 bits for terminals 2 and 4)
0.03 Hz/60 Hz (0 to 5 V/11 bits or 0 to 20 mA/approx. 11 bits for terminals 2 and 4, 0 to ±10 V/12 bits for terminal 1)
setting input 0.06 Hz/60 Hz (0 to ±5 V/11 bits for terminal 1)
resolution Digital input 0.01 Hz
Control specifications

Analog
Frequency Within ±0.2% of the max. output frequency (25°C ± 10°C)
input
accuracy
Digital input Within 0.01% of the set output frequency
Voltage/frequency Base frequency can be set from 0 to 590 Hz. Constant-torque/variable-torque pattern or adjustable 5 points V/F can be
characteristics selected.
Starting torque LD rating: 150% 0.3 Hz, ND rating: 200% 0.3 Hz. (under Real sensorless vector control or vector control)
Torque boost Manual torque boost
Acceleration/deceleration 0 to 3600 s (acceleration and deceleration can be set individually), linear or S-pattern acceleration/deceleration mode,
time setting backlash countermeasures acceleration/deceleration can be selected.
DC injection brake
Operation frequency (0 to 120 Hz), operation time (0 to 10 s), operation voltage (0 to 30%) variable
(induction motor)
Stall prevention Activation range of stall prevention operation (LD rating: 0 to 150%, ND rating: 0 to 220%). Whether to use the stall
operation level prevention or not can be selected (V/F control, Advanced magnetic flux vector control)
Torque limit value can be set (0 to 400% variable).
Torque limit level
(Real sensorless vector control, vector control, PM sensorless vector control)
Analog Terminals 2 and 4: 0 to 10 V, 0 to 5 V, 4 to 20 mA (0 to 20 mA) are available.
Frequency
input Terminal 1: -10 to +10 V, -5 to +5 V are available.
setting
Input using the setting dial of the operation panel or parameter unit
signal Digital input
Four-digit BCD or 16-bit binary (when used with option FR-A8AX)
Start signal Forward and reverse rotation or start signal automatic self-holding input (3-wire input) can be selected.
Low-speed operation command, Middle-speed operation command, High-speed operation command,
Input signals Second function selection, Terminal 4 input selection, Jog operation selection, Selection of automatic restart after
instantaneous power failure, flying start, Output stop, Start self-holding selection, Forward rotation command, Reverse
(twelve terminals) rotation command, Inverter reset
Operation specifications

The input signal can be changed using Pr.178 to Pr.189 (Input terminal function selection).
Pulse train input 100k pulses/s
Maximum and minimum frequency settings, multi-speed operation, acceleration/deceleration pattern, thermal protection,
DC injection brake, starting frequency, JOG operation, output stop (MRS), stall prevention, regeneration avoidance,
increased magnetic excitation deceleration, frequency jump, rotation display, automatic restart after instantaneous power
failure, electronic bypass sequence, remote setting, automatic acceleration/deceleration, retry function, carrier frequency
selection, fast-response current limit, forward/reverse rotation prevention, operation mode selection, slip compensation,
Operational functions droop control, load torque high-speed frequency control, speed smoothing control, traverse, auto tuning, applied motor
selection, gain tuning, RS-485 communication, Ethernet communication, PID control, PID pre-charge function, easy
dancer control, cooling fan operation selection, stop selection (deceleration stop/coasting), power-failure deceleration
stop function, stop-on-contact control, PLC function, life diagnosis, maintenance timer, current average monitor, multiple
rating, orientation control, speed control, torque control, position control, pre-excitation, torque limit, test run, 24 V power
supply input for control circuit, safety stop function, anti-sway control, emergency drive
Open collector output Inverter running, Up to frequency, Instantaneous power failure/undervoltage, Overload warning,
Output signal

(five terminals) Output frequency detection, Fault

Relay output The output signal can be changed using Pr.190 to Pr.196 (Output terminal function selection).
(two terminals) Fault codes of the inverter can be output (4 bits) from the open collector.
Pulse train output
50k pulses/s
(FM type)
Pulse train
Max. 2.4 kHz: one terminal (output frequency)
output
The monitored item can be changed using Pr.54 FM/CA terminal function selection.
(FM type)
Current
For meter Max. 20 mADC: one terminal (output current)
output
Indication

The monitored item can be changed using Pr.54 FM/CA terminal function selection.
(CA type)
Voltage Max. 10 VDC: one terminal (output voltage)
output The monitored item can be changed using Pr.158 AM terminal function selection.
Operating Output frequency, Output current, Output voltage, Frequency setting value
Operation
status The monitored item can be changed using Pr.52 Operation panel main monitor selection.
panel
Fault record is displayed when a fault occurs. Past 8 fault records and the conditions immediately before the fault (output
(FR-DU08) Fault record
voltage/current/frequency/cumulative energization time/year/month/date/time) are saved.

SPECIFICATIONS 107
Common specifications

Overcurrent trip during acceleration, Overcurrent trip during constant speed, Overcurrent trip during deceleration or stop,
Regenerative overvoltage trip during acceleration, Regenerative overvoltage trip during constant speed, Regenerative
overvoltage trip during deceleration or stop, Inverter overload trip, Motor overload trip, Heatsink overheat, Instantaneous
power failure, Undervoltage, Input phase loss, Stall prevention stop, Loss of synchronism detection, Upper limit fault
detection, Lower limit fault detection, Output side earth (ground) fault overcurrent, Output short circuit, Output phase
loss, External thermal relay operation, PTC thermistor operation, Option fault, Communication option fault, Parameter
storage device fault, PU disconnection, Retry count excess, Parameter storage device fault, CPU fault, Operation panel
Fault
power supply short circuit/RS-485 terminals power supply short circuit, 24 VDC power fault, Abnormal output current
detection, Inrush current limit circuit fault, Communication fault (inverter), Analog input fault, USB communication fault,
Protective Safety circuit fault,Overspeed occurrence, Speed deviation excess detection, Signal loss detection, Excessive
function position fault, Encoder signal loss for orientation, Brake sequence fault, Encoder phase fault, 4 mA input
fault, Pre-charge fault, PID signal fault, Opposite rotation deceleration fault, Internal circuit fault, Abnormal internal
temperature, Magnetic pole position unknown, External fault during output operation, Ethernet communication fault,
Internal storage device fault
Fan alarm, Stall prevention (overcurrent), Stall prevention (overvoltage), Electronic thermal relay function pre-alarm, PU
Alarm, stop, Speed limit indication, Parameter copy, Maintenance signal output, USB host error, Home position return setting
Warning, error, Home position return uncompleted, Home position return parameter setting error, Operation panel lock,
Error Password locked, Parameter write error, Copy operation error, 24 V external power supply operation, Low flow rate
message input warning, Continuous operation during communication fault, Load fault warning, Ethernet communication fault,
Emergency drive in operation
Surrounding air
-10°C to +50°C (non-freezing)
temperature
95% RH or less (non-condensing) (With circuit board coating (conforming to IEC60721-3-3:1994 3C2/3S2) )
Surrounding air humidity
90% RH or less (non-condensing) (Without circuit board coating)
Coolant
1 to 40°C (non-freezing)
temperature
Environment

Coolant flow 3.0 to 3.7 L/min (FR-A840-03250(110K) and FR-A840-03610(132K))

Coolant rate 6.0 to 7.5 L/min (FR-A840-04320(160K) to FR-A840-06830(280K))
Maximum
permissible 300 kPa
pressure
Storage temperature -20°C to +65°C
Atmosphere Indoors (without corrosive gas, flammable gas, oil mist, dust and dirt, etc.)
2000 m or less 
Altitude/vibration
2.9 m/s2 or less at 10 to 55 Hz (directions of X, Y, Z axes)
 Available only when a vector control compatible option is mounted.
 In the initial setting, the starting torque is limited to 150% by the torque limit level.
 This protective function is not available in the initial status.
 Temperature applicable for a short time, e.g. in transit.
To store the inverter after the coolant has passed through the pipes, fill the pipes with coolant sufficiently enough that it contains antifreezing
agent to prevent corrosion. Or fill the pipes with nitrogen gas after the inside of the pipes is fully dried. If any moisture remains inside the pipes,
it may react with oxygen in the air to form corrosion.
 For the installation at an altitude above 1000 m, consider a 3% reduction in the rated current per 500 m increase in altitude.
 Condensation may occur depending on the humidity and the coolant temperature. Adjust the humidity and the coolant temperature to prevent
condensation.
 Under normal condition, keep the flow rate between 3.2 and 3.5 L/min for the FR-A840-03610(132K) or lower and between 6.5 and 7.0 L/min
for the FR-A840-04320(160K) or higher.
 Available for the FR-A800-E only

108 SPECIFICATIONS
 Inverter outline dimensions

5.3 Inverter outline dimensions

FR-A840-03250(110K), FR-A840-03610(132K)-LC

2-φ12 hole

(18)
(15)
400 4-φ 25 hole 22

(795)

704
757
732

12 3.2
35
10

280 2-R3/8 88.4

46 373 (46) 115.4
70 360
465
Always connect a DC reactor (FR-HEL), which is available as an option. (Unit: mm)

FR-A840-04320(160K), FR-A840-04810(185K)-LC
(13)

3-φ12 hole 200 200 4-φ16 hole 22

15

1016
(1077)
1015
1042

14 3.2
13
12

290 2-R3/8 110.1

55 388 (55) 137.1
79 380
498
Always connect a DC reactor (FR-HEL), which is available as an option. (Unit: mm)
5

SPECIFICATIONS 109
Inverter outline dimensions

FR-A840-05470(220K), FR-A840-06100(250K), FR-A840-06830(280K)-LC

22

(13)
3-φ12 hole 300 300 4-φ16 hole

(13)
FAN

(1064)
1010
984

984
3.2
12
13
13

187.5 2-R3/8 137.1

252.5 39 380
330 270
680

Always connect a DC reactor (FR-HEL), which is available as an option. (Unit: mm)

Operation panel (FR-DU08)

Outline drawing Panel cutting dimension drawing
120 or more∗1
Panel Parameter unit
3.2max 21 27.8 connection
3

FR-DU08 cable (FR-CB2[ ])

(option)
72.5
78.5

20
72.5

22 Air-bleeding
hole

66 Operation panel connection connector

3

2-M3 screw
(FR-ADP) (option)
3 66 3 16

72 17 ∗1 Denotes the space required to connect an optional

parameter unit connection cable (FR-CB2[ ]). When
using another cable, leave the space required for the
cable specification.
(Unit: mm)

110 SPECIFICATIONS
 APPENDIX

APPENDIX provides the reference information for use of this product.

Refer to APPENDIX as required.

Appendix 1 Instructions for compliance with the EU Directives.....112

Appendix 2 Instructions for UL and cUL.............................................115
Appendix 3 Instructions for EAC .........................................................117
Appendix 4 Restricted Use of Hazardous Substances in
Electronic and Electrical Products...............................118
Appendix 5 Referenced Standard (Requirement of Chinese
standardized law)..........................................................118
Appendix 6 Compliance with the UK certification scheme..............119
Appendix 7 Compliance with the EU ErP Directive (Ecodesign
Directive) ............................................................................119

APPENDIX 111
Appendix 1 Instructions for compliance with
the EU Directives

The EU Directives are issued to standardize different national regulations of the EU Member States and to facilitate free
movement of the equipment, whose safety is ensured, in the EU territory.
Since 1996, compliance with the EMC Directive that is one of the EU Directives has been legally required. Since 1997,
compliance with the Low Voltage Directive, another EU Directive, has been also legally required. When a manufacturer
confirms its equipment to be compliant with the EMC Directive and the Low Voltage Directive, the manufacturer must declare
the conformity and affix the CE marking.

• The authorized representative in the EU

The authorized representative in the EU is shown below.
Name: Mitsubishi Electric Europe B.V.
Address: Mitsubishi-Electric-Platz 1, 40882 Ratingen, Germany

EMC Directive
We declare that this inverter conforms with the EMC Directive and affix the CE marking on the inverter.
• EMC Directive: 2014/30/EU
• Standard(s): EN61800-3 Second environment / PDS Category "C3"
• This inverter is not intended to be used on a low-voltage public network which supplies domestic premises. When using the
inverter in a residential area, take appropriate measures and ensure the conformity of the inverter used in the residential
area.
• Radio frequency interference is expected if used on such a network.
• The installer shall provide a guide for installation and use, including recommended mitigation devices.

Note:
First environment
Environment including buildings/facilities which are directly connected to a low voltage main supply which also supplies
residential buildings. Directly connected means that there is no intermediate transformer between these buildings.
Second environment
Environment including all buildings/facilities which are not directly connected to a low voltage main supply which also supplies
residential buildings.

 Note
Set the EMC filter valid and install the inverter and perform wiring according to the following instructions.
• This inverter is equipped with an EMC filter with a class C3. Enable the EMC filter. (For details, refer to page 79.)
• Connect the inverter to an earthed power supply.
• Install a motor and a control cable written in the EMC Installation Guidelines (BCN-A21041-204) and Technical News
(MF-S-136) according to the instruction.
• To ensure sufficient function of the built-in EMC filter, motor cable lengths should not be exceeded more than 20 m.
• Confirm that the inverter conforms with the EMC Directive as the industrial drives application for final installation.

112 APPENDIX
Low Voltage Directive
We have self-confirmed our inverters as products compliant to the Low Voltage Directive and affix the CE marking on the
inverters.
• Low Voltage Directive: 2014/35/EU
• Conforming standard: EN 61800-5-1

 Outline of instructions
• Do not use an earth leakage current breaker as an electric shock protector without connecting the equipment to the
earth. Connect the equipment to the earth securely.
• Wire the earth terminal independently. (Do not connect two or more cables to one terminal.)
• Use the cable sizes indicated on page 37 under the following conditions.
• Surrounding air temperature: 40°C maximum
If conditions are different from above, select appropriate wire according to EN60204-1 or IEC60364-5-52.
• Use a tinned (plating should not include zinc) crimp terminal to connect the earth (ground) cable. When tightening the
screw, be careful not to damage the threads.
For use as a product compliant with the Low Voltage Directive, use PVC cable whose size is indicated on page 37.
• Use the molded case circuit breaker and magnetic contactor which conform to the EN or IEC Standard.
• This product can cause a d.c. current in the protective earthing conductor. Where a residual current-operated protective
(RCD) or monitoring (RCM) device is used for protection in case of direct or indirect contact, only an RCD or RCM of
Type B is allowed on the supply side of this product.
• Use the inverter under the conditions of overvoltage category II (usable regardless of the earth (ground) condition of the
power supply), overvoltage category III (usable with the earthed-neutral system power supply) and pollution degree 2 or
lower specified in IEC60664.
• To use the inverter under the conditions of pollution degree 2, install it in the enclosure of IP 2X or higher.
• To use the inverter under the conditions of pollution degree 3, install it in the enclosure of IP54 or higher.
• On the input and output of the inverter, use cables of the type and size set forth in EN60204-1 or IEC60364-5-52.
• The operating capacity of the relay outputs (terminal symbols A1, B1, C1, A2, B2 and C2) should be 30 VDC, 0.3 A.
(Relay output has basic isolation from the inverter internal circuit.)
• Control circuit terminals indicated on page 27 are safely isolated from the main circuit.
• Environment (For the detail, refer to page 19.)
During operation In storage During transportation
Surrounding air temperature LD, ND (initial setting): -10 to +50°C -20 to +65°C -20 to +65°C
Ambient humidity 95% RH or less 95% RH or less 95% RH or less
Maximum altitude 2000 m  1000 m 10000 m

 For the installation at an altitude above 1000 m, consider a 3% reduction in the rated current per 500 m increase in altitude.

 Wiring protection
Class T, Class J, Class CC, or Class L fuse must be provided.
(Use a product which conforms to the EN or IEC Standard.)
03250 03610 04320 04810 05470 06100 06830
FR-A840-[]-LC
(110K) (132K) (160K) (185K) (220K) (250K) (280K)
Rated fuse voltage(V) 500 V or more
Fuse allowable rating (A) 400 500 600 700 800 900 1000

 Short circuit ratings

Suitable for use in a circuit capable of delivering not more than 100 kA rms symmetrical amperes, 500 V maximum.

APPENDIX 113
Motor overload protection
When using the electronic thermal relay function as motor overload protection, set the rated motor current in Pr.9 Electronic
thermal O/L relay.

Operation characteristics of electronic thermal relay function This function detects the overload of the motor, stops the operation
Pr. 9 = 50% setting of
inverter rating*1.2
Pr. 9 = 100% setting
of inverter rating*1.2
of the inverter's output transistor, and stops the output. (The
operation characteristic is shown on the left.)
Operation time (min)
Minute display in

70 30Hz or more*3
30Hz
• When using the Mitsubishi Electric constant-torque motor
this range

or more*3 20Hz Operation range

20Hz 10Hz Range on the right of
60 characteristic curve
10Hz
6Hz
6Hz Non-operation range (1) Set one of "1, 13 to 16, 50, 53, 54" in Pr.71. (This provides a
0.5Hz Range on the left of
50 0.5Hz characteristic curve 100% continuous torque characteristic in the low-speed range.)
Characteristic when electronic thermal
relay function for motor protection is (2) Set the rated current of the motor in Pr.9.
Second display in this range

240 turned off (When Pr. 9 setting is 0(A))

Operation time (s)

180  When a value 50% of the inverter rated output current (current value)
is set in Pr.9
Range for
120 transistaor  The % value denotes the percentage to the inverter rated current. It is
protection*4
not the percentage to the rated motor current.
60
 When you set the electronic thermal relay function dedicated to the
105%
52.5% Mitsubishi Electric constant-torque motor, this characteristic curve
50 100 150 230
Inverter output current (%) applies to operation at 6 Hz or higher.
(% to the rated output current)
 Transistor protection is activated depending on the temperature of
the heatsink. The protection may be activated even with less than
150% depending on the operating conditions.

NOTE
• The internal accumulated heat value of the electronic thermal relay function is reset by inverter power reset and reset signal
input. Avoid unnecessary reset and power-OFF.
• When multiple motors are driven with a single inverter or when a multi-pole motor or a special motor is driven, install an
external thermal relay (OCR) between the inverter and motors. Note that the current indicated on the motor rating plate is
affected by the line-to-line leakage current (details in the Instruction Manual (Detailed)) when selecting the setting for an
external thermal relay.
• The cooling effect of the motor drops during low-speed operation. Use a thermal protector or a motor with built-in thermistor.
• When the difference between the inverter and motor capacities is large and the setting is small, the protective characteristics
of the electronic thermal relay function will be deteriorated. In this case, use an external thermal relay.
• A special motor cannot be protected by the electronic thermal relay function. Use an external thermal relay.
• Set Pr.9 = "0" for vector-control-dedicated motors (SF-V5RU) because they are equipped with thermal protectors.
• Motor over temperature sensing is not provided by the drive.
• Electronic thermal memory retention function is not provided by the drive.

EU RoHS Directive

We declare that our inverters are compliant to the EU RoHS Directive (2011/65/EU) and affix the CE marking on the inverters.

114 APPENDIX
Appendix 2 Instructions for UL and cUL
(Standard to comply with: UL 508C, CSA C22.2 No.274-13)

General precaution
CAUTION - Risk of Electric Shock -
The bus capacitor discharge time is 10 minutes. Before starting wiring or inspection, switch power off, wait for more than 10
minutes, and check for residual voltage between terminal P/+ and N/- with a meter etc., to avoid a hazard of electrical shock.
ATTENTION - Risque de choc électrique -
La durée de décharge du condensateur de bus est de 10 minutes. Avant de commencer le câblage ou l’inspection, mettez
l’appareil hors tension et attendez plus de 10 minutes.

Installation
The below types of inverters have been approved as products for use in enclosure and approval tests were conducted under
the following conditions.
Design the enclosure so that the surrounding air temperature, humidity and ambience of the inverter will satisfy the
specifications. (Refer to page 19.)

 Wiring protection
For installation in the United States, Class T, Class J, Class CC, or Class L fuse must be provided, in accordance with the
National Electrical Code and any applicable local codes.
For installation in Canada, Class T, Class J, Class CC, or Class L fuse must be provided, in accordance with the Canadian
Electrical Code and any applicable local codes.

03250 03610 04320 04810 05470 06100 06830

FR-A840-[]-LC
(110K) (132K) (160K) (185K) (220K) (250K) (280K)
Rated fuse voltage(V) 500 V or more
Fuse allowable rating (A) 400 500 600 700 800 900 1000

Wiring to the power supply and the motor

Refer to the National Electrical Code (Article 310) regarding the allowable current of the cable. Select the cable size for 125%
of the rated current according to the National Electrical Code (Article 430).
For wiring the input (R/L1, S/L2, T/L3) and output (U, V, W) terminals of the inverter, use the UL listed copper, stranded wires
(rated at 75°C) and round crimp terminals. Crimp the crimp terminals with the crimping tool recommended by the terminal
maker.

Short circuit ratings

Suitable for use in a circuit capable of delivering not more than 100 kA rms symmetrical amperes, 500 V maximum.

APPENDIX 115
Motor overload protection
When using the electronic thermal relay function as motor overload protection, set the rated motor current in Pr.9 Electronic
thermal O/L relay.

Operation characteristics of electronic thermal relay function This function detects the overload (overheat) of the motor, stops the
Pr. 9 = 50% setting of
inverter rating*1.2
Pr. 9 = 100% setting
of inverter rating*1.2
operation of the inverter's output transistor, and stops the output.
(The operation characteristic is shown on the left.)
Operation time (min)
Minute display in

70 30Hz or more*3
30Hz
• When using the Mitsubishi Electric constant-torque motor
this range

or more*3 20Hz Operation range

20Hz 10Hz Range on the right of
60 characteristic curve
10Hz
6Hz
6Hz Non-operation range (1) Set one of "1, 13 to 16, 50, 53, 54" in Pr.71. (This provides a
0.5Hz Range on the left of
50 0.5Hz characteristic curve 100% continuous torque characteristic in the low-speed range.)
Characteristic when electronic thermal
relay function for motor protection is (2) Set the rated current of the motor in Pr.9.
Second display in this range

240 turned off (When Pr. 9 setting is 0(A))

Operation time (s)

180  When a value 50% of the inverter rated output current (current value)
is set in Pr.9
Range for
120 transistaor  The % value denotes the percentage to the inverter rated current. It is
protection*4
not the percentage to the rated motor current.
60
 When you set the electronic thermal relay function dedicated to the
105%
52.5% Mitsubishi Electric constant-torque motor, this characteristic curve
50 100 150 230
Inverter output current (%) applies to operation at 6 Hz or higher.
(% to the rated output current)
 Transistor protection is activated depending on the temperature of
the heatsink. The protection may be activated even with less than
150% depending on the operating conditions.

NOTE
• The internal accumulated heat value of the electronic thermal relay function is reset by inverter power reset and reset signal
input. Avoid unnecessary reset and power-OFF.
• When multiple motors are driven with a single inverter or when a multi-pole motor or a special motor is driven, install an
external thermal relay (OCR) between the inverter and motors. Note that the current indicated on the motor rating plate is
affected by the line-to-line leakage current (details in the Instruction Manual (Detailed)) when selecting the setting for an
external thermal relay.
• The cooling effect of the motor drops during low-speed operation. Use a thermal protector or a motor with built-in thermistor.
• When the difference between the inverter and motor capacities is large and the setting is small, the protective characteristics
of the electronic thermal relay function will be deteriorated. In this case, use an external thermal relay.
• A special motor cannot be protected by the electronic thermal relay function. Use an external thermal relay.
• Set Pr.9 = "0" for vector-control-dedicated motors (SF-V5RU) because they are equipped with thermal protectors.
• Motor over temperature sensing is not provided by the drive.

116 APPENDIX
Appendix 3 Instructions for EAC

The product certified in compliance with the Eurasian Conformity has the EAC marking.

Note: EAC marking

In 2010, three countries (Russia, Belarus, and Kazakhstan) established a Customs Union for the purposes of revitalizing the
economy by forming a large economic bloc by abolishing or reducing tariffs and unifying regulatory procedures for the
handling of articles.
Products to be distributed over these three countries of the Customs Union must comply with the Customs Union Technical
Regulations (CU-TR), and the EAC marking must be affixed to the products.

For information on the country of origin, manufacture year and month, and authorized sales representative (importer) in the
CU area of this product, refer to the following:

• Country of origin indication

Check the rating plate of the product. (Refer to page 8.)
Example: MADE IN JAPAN

• Manufactured year and month

Check the SERIAL number indicated on the rating plate of the product. (Refer to page 8.)

• Authorized sales representative (importer) in the CU area

The authorized sales representative (importer) in the CU area is shown below.
Name: Mitsubishi Electric Turkey A.S. Head Office
Address: Serifali Mahallesi Kale Sokak. No:41 34775 Umraniye, Istanbul, Turkey
Phone: +90-216-969-25-00
Fax: +90-216-661-44-47

APPENDIX 117
Appendix 4 Restricted Use of Hazardous
Substances in Electronic and
Electrical Products
The mark of restricted use of hazardous substances in electronic and electrical products is applied to the product as follows
based on the “Management Methods for the Restriction of the Use of Hazardous Substances in Electrical and Electronic
Products” of the People's Republic of China.

电器电子产品有害物质限制使用标识要求

环境保护使
用期限标识

本产品中所含有的有害物质的名称、含量、含有部件如下表所示。

• 产品中所含有害物质的名称及含量
有害物质 
部件名称  铅 汞 镉 六价铬 多溴联苯 多溴二苯醚
(Pb) (Hg) (Cd) (Cr(VI)) (PBB) (PBDE)
电路板组件 （包括印刷电
路板及其构成的零部件，
× ○ × ○ ○ ○
如电阻、电容、集成电路、
连接器等）、电子部件
金属壳体、金属部件 × ○ ○ ○ ○ ○
树脂壳体、树脂部件 ○ ○ ○ ○ ○ ○
螺丝、电线 ○ ○ ○ ○ ○ ○

上表依据 SJ/T11364 的规定编制。

○：表示该有害物质在该部件所有均质材料中的含量均在 GB/T26572 规定的限量要求以下。
×：表示该有害物质在该部件的至少一种均质材料中的含量超出 GB/T26572 规定的限量要求。
 即使表中记载为 ×，根据产品型号，也可能会有有害物质的含量为限制值以下的情况。
 根据产品型号，一部分部件可能不包含在产品中。

Appendix 5 Referenced Standard

(Requirement of Chinese
standardized law)
This Product is designed and manufactured accordance with following Chinese standards.

Machinery safety:GB/T 16855.1

GB/T 12668.502
GB 28526
GB/T 12668.3
Electrical safety : GB/T 12668.501
EMC : GB/T 12668.3

118 APPENDIX
Appendix 6 Compliance with the UK
certification scheme
We declare that this product conforms with the related technical requirements under UK legislation, and
affix the UKCA (UK Conformity Assessed) marking on the product.
Approval conditions are the same as those for the EU Directives. (Refer to page 112.)

UKCA marking:
The UKCA marking is used for products sold in the markets of Great Britain (England, Wales, and Scotland) from January 1,
2021 after the departure of the UK from the EU on January 31, 2020.

Appendix 7 Compliance with the EU ErP

Directive (Ecodesign Directive)
Based on the EU ErP Directive (Ecodesign Directive), the power loss data of the inverters are shown in the following table.
The regulation covers 3-phase variable speed drives from 0.12 kW ≤ Pn ≤ 1 000 kW.

• LD rated
Rated load load load load load load load load
Stand by
Apparent point 1 point 2 point 3 point 4 point 5 point 6 point 7 point 8
Model name loss IE class
power (90;100) (50;100) (0;100) (90;50) (50;50) (0;50) (50;25) (0;25)
(W)
(kVA) (%) (%) (%) (%) (%) (%) (%) (%)
FR-A840-03250(110K)(-**)-
198 99.1 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-03610(132K)(-**)-
248 99.1 1.5 1.5 1.5 0.8 0.8 0.8 0.5 0.5 IE2
LC
FR-A840-04320(160K)(-**)-
275 139.8 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-04810(185K)(-**)-
329 139.8 1.5 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-05470(220K)(-**)-
367 169.4 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-06100(250K)(-**)-
417 169.4 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-06830(280K)(-**)-
465 169.4 1.5 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
Note: ** indicates alpha numeric combination which means an inverter type such as 1 and 2.
• ND rated
Rated load load load load load load load load
Stand by
Apparent point 1 point 2 point 3 point 4 point 5 point 6 point 7 point 8
Model name loss IE class
power (90;100) (50;100) (0;100) (90;50) (50;50) (0;50) (50;25) (0;25)
(W)
(kVA) (%) (%) (%) (%) (%) (%) (%) (%)
FR-A840-03250(110K)(-**)-
165 99.1 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-03610(132K)(-**)-
198 99.1 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-04320(160K)(-**)-
248 139.8 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-04810(185K)(-**)-
275 139.8 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-05470(220K)(-**)-
329 169.4 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-06100(250K)(-**)-
367 169.4 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
FR-A840-06830(280K)(-**)-
417 169.4 1.4 1.4 1.4 0.7 0.7 0.7 0.5 0.5 IE2
LC
Note: ** indicates alpha numeric combination which means an inverter type such as 1 and 2.

APPENDIX 119
WARRANTY

When using this product, make sure to understand the warranty described below.

1. Warranty period and coverage

We will repair any failure or defect (hereinafter referred to as "failure") in our FA equipment (hereinafter referred to as the "Product") arisen during warranty
period at no charge due to causes for which we are responsible through the distributor from which you purchased the Product or our service provider. How-
ever, we will charge the actual cost of dispatching our engineer for an on-site repair work on request by customer in Japan or overseas countries. We are not
responsible for any on-site readjustment and/or trial run that may be required after a defective unit are repaired or replaced.
[Term]
The term of warranty for Product is twelve months after your purchase or delivery of the Product to a place designated by you or eighteen months from the
date of manufacture whichever comes first ("Warranty Period"). Warranty period for repaired Product cannot exceed beyond the original warranty period
before any repair work.
[Limitations]
(1) You are requested to conduct an initial failure diagnosis by yourself, as a general rule. It can also be carried out by us or our service company upon your
request and the actual cost will be charged.
However, it will not be charged if we are responsible for the cause of the failure.
(2) This limited warranty applies only when the condition, method, environment, etc. of use are in compliance with the terms and conditions and instructions
that are set forth in the instruction manual and user manual for the Product and the caution label affixed to the Product.
(3) Even during the term of warranty, the repair cost will be charged on you in the following cases;
• a failure caused by your improper storing or handling, carelessness or negligence, etc., and a failure caused by your hardware or software problem
• a failure caused by any alteration, etc. to the Product made on your side without our approval
• a failure which may be regarded as avoidable, if your equipment in which the Product is incorporated is equipped with a safety device required by
applicable laws and has any function or structure considered to be indispensable according to a common sense in the industry
• a failure which may be regarded as avoidable if consumable parts designated in the instruction manual, etc. are duly maintained and replaced
• any replacement of consumable parts (condenser, cooling fan, etc.)
• a failure caused by external factors such as inevitable accidents, including without limitation fire and abnormal fluctuation of voltage, and acts of
God, including without limitation earthquake, lightning and natural disasters
• a failure caused by using the emergency drive function
• a failure generated by an unforeseeable cause with a scientific technology that was not available at the time of the shipment of the Product from our
company
• any other failures which we are not responsible for or which you acknowledge we are not responsible for

2. Term of warranty after the stop of production

(1) We may accept the repair at charge for another seven (7) years after the production of the product is discontinued. The announcement of the stop of
production for each model can be seen in our Sales and Service, etc.
(2) Please note that the Product (including its spare parts) cannot be ordered after its stop of production.

3. Service in overseas
Our regional FA Center in overseas countries will accept the repair work of the Product; however, the terms and conditions of the repair work may differ
depending on each FA Center. Please ask your local FA center for details.

4. Exclusion of loss in opportunity and secondary loss from warranty liability

Regardless of the gratis warranty term, Mitsubishi Electric shall not be liable for compensation to:
(1) Damages caused by any cause found not to be the responsibility of Mitsubishi Electric.
(2) Loss in opportunity, lost profits incurred to the user by Failures of Mitsubishi Electric products.
(3) Special damages and secondary damages whether foreseeable or not, compensation for accidents, and compensation for damages to products other
than Mitsubishi Electric products.
(4) Replacement by the user, maintenance of on-site equipment, start-up test run and other tasks.

5. Change of Product specifications

Specifications listed in our catalogs, manuals or technical documents may be changed without notice.

6. Application and use of the Product

(1) For the use of our product, its applications should be those that may not result in a serious damage even if any failure or malfunction occurs in product,
and a backup or fail-safe function should operate on an external system to product when any failure or malfunction occurs.
(2) Our product is designed and manufactured as a general purpose product for use at general industries.
Therefore, applications substantially influential on the public interest for such as atomic power plants and other power plants of electric power compa-
nies, and also which require a special quality assurance system, including applications for railway companies and government or public offices are not
recommended, and we assume no responsibility for any failure caused by these applications when used.
In addition, applications which may be substantially influential to human lives or properties for such as airlines, medical treatments, railway service,
incineration and fuel systems, man-operated material handling equipment, entertainment machines, safety machines, etc. are not recommended, and
we assume no responsibility for any failure caused by these applications when used.
We will review the acceptability of the abovementioned applications, if you agree not to require a specific quality for a specific application. Please con-
tact us for consultation.

120
MEMO

121
REVISIONS
*The manual number is given on the bottom left of the back cover.

Revision Date *Manual number Revision

Jul. 2017 IB(NA)-0600683ENG-A First edition
Aug. 2018 IB(NA)-0600683ENG-B Added
• Operation panel (FR-DU08)
• Safety stop function
• Ethernet communication
• Referenced Standard (Requirement of Chinese standardized law)
Oct. 2024 IB(NA)-0600683ENG-C Added
• Emergency drive in operation (ED)
• Compliance with the UK certification scheme
• Compliance with the EU ErP Directive (Ecodesign Directive)
Edited
• Instructions for compliance with the EU Directives
• Instructions for EAC
• Referenced Standard (Requirement of Chinese standardized law)
• Deletion of "enclosed CD-ROM"

122 IB(NA)-0600683ENG-C
 INVERTER
INVERTER
A800 Plus

A800 Plus
FR-A840-LC (LIQUID COOLED TYPE)
INSTRUCTION MANUAL (HARDWARE)

High functionality and high performance

FR-A840-03250(110K) to 06830(280K)-LC

FR-A840-LC INSTRUCTION MANUAL (HARDWARE)

INTRODUCTION
1
INSTALLATION AND WIRING
2
PRECAUTIONS FOR USE OF
THE INVERTER 3
PRECAUTIONS FOR
MAINTENANCE AND 4
HEAD OFFICE: TOKYO BUILDING 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
INSPECTION
SPECIFICATIONS
5

IB(NA)-0600683ENG-C(2410)MEE Printed in Japan Specifications subject to change without notice.