HP-5051-7

Speed Controller
MSC-1
OPERATING MANUAL

Thank you for purchasing an Oriental Motor product.

This Manual describes product handling procedures and safety precautions.
•• Please read it thoroughly to ensure safe operation.
•• Always keep the manual where it is readily available.

Table of contents
1 Introduction................................ 2 6 Basic operations...................... 13
6.1 Run/stop.......................................13
2 Safety precautions..................... 4
6.2 Setting the operating speed.........13
3 Precautions for use................... 5 6.3 Setting the acceleration time and
4 Installation................................. 6 deceleration time..........................14
4.1 Location for installation..................6 6.4 2-speed operation........................14
4.2 Installation method.........................6 6.5 Timing chart..................................15
4.3 Installing an external 6.6 Multi-motor control.......................15
potentiometer (Sold separately).....7 6.7 Repeated cycle of operation/
4.4 Installing and wiring in compliance instantaneous stop.......................16
with EMC Directive.........................7 6.8 Braking current at instantaneous
5 Connection................................ 9 stop..............................................16
5.1 Connection example......................9 7 Alarms..................................... 17
5.2 I/O signals....................................12
8 Inspection................................ 18
9 Troubleshooting and remedial
actions..................................... 19
Introduction

1 Introduction
„„
Before use
Only qualified personnel of electrical and mechanical engineering should work with the product.
Use the product correctly after thoroughly reading the section "2 Safety precautions." In addition, be
sure to observe the contents described in warning, caution, and note in this manual. Do not use for any
other purpose. Oriental Motor Co., Ltd. is not responsible for any damage caused through failure to
observe this warning.

Overview of the MSC-1

„„
The MSC-1 is a speed controller for velocity adjustment of AC speed control motors.

„„
Applicable motors
AC speed control motor (6 to 90 W)
Also read the OPERATING MANUAL for applicable motor.

„„
Standard and CE Marking
The MSC-1 is recognized by UL, and affixed the CE Marking (Low Voltage Directive and EMC
Directive) under the EN Standards.
•• Applicable Standards
Applicable Standards Cettification Body Standards File No. CE Marking
UL 508 UL E91291 −
Low Voltage Directive
EN 50178 Conform to EN standards
EMC Directive

•• Installation conditions (EN Standard)

For use as a component within another device Overvoltage category: II
Protection against electric shock: Class II Pollution degree: 2
* If your equipment requires conformance to overvoltage category III, supply the power via an insulated
transformer.
* If your equipment requires conformance to pollution degree 3, store the speed controller in an IP54-compliant
enclosure.
•• Low Voltage Directives
This product is designed and manufactured to be incorporated in equipment.
•• EMC Directives
Refer to "4.4 Installing and wiring in compliance with EMC Directive" on p.7.

„„
RoHS Directive
The products do not contain the substances exceeding the restriction values of RoHS Directive (2011/65/EU).

„„
Checking the product
Verify that the items listed below are included. Report any missing or damaged items to the branch or
sales office from which you purchased the product.
• Speed controller.................................................1 unit
• CN1 connector...................................................1 pc.
• Instructions and Precautions for Safe Use.........1 copy

−2−
 Introduction

„„
Names and functions of parts

POWER LED (Green) ALARM LED (Red)

Internal potentiometer (VR1)

Main circuit terminal (TB1)
Acceleration time potentiometer (VR2)

Deceleration time potentiometer (VR3)

Not used (SW1-2)

Speed command voltage select switch

(SW1-1)

Control circuit terminal (CN1)

DIN lever

Name Description
POWER LED (Green) This LED lit while the AC power is input.
This LED will blink when an alarm generates. The ALARM output will become
ALARM LED (Red)
OFF (H level). (P.17)
Internal potentiometer
Sets the operating speed of the motor. (P.13)
(VR1)
Acceleration time
Sets the acceleration time for the motor. (P.14)
potentiometer (VR2)
Deceleration time
Sets the deceleration time for the motor. (P.14)
potentiometer (VR3)
Speed command voltage If external DC voltage is to be used to set the operating speed, set this switch
select switch (SW1-1) according to the applicable external DC voltage. Select 5 V or 10 V. (P.13)
Control circuit terminal
Connects the control DC power supply (24 V) and I/O signals. (P.9)
(CN1)
Main circuit terminal (TB1) Connects the AC power supply, motor, rate generator and capacitor. (P.9)
DIN lever Mounts the speed controller to a DIN rail. (P.6)

−3−
Safety precautions

2 Safety precautions
The precautions described below are intended to prevent danger or injury to the user and other
personnel through safe, correct use of the product. Use the product only after carefully reading and fully
understanding these instructions.

Handling the product without observing the instructions that accompany a

"WARNING" symbol may result in serious injury or death.
Handling the product without observing the instructions that accompany a
"CAUTION" symbol may result in injury or property damage.
The items under this heading contain important handling instructions that the
Note user should observe to ensure safe use of the product.

Description of graphic symbols

Indicates "prohibited" actions that must not Indicates "compulsory" actions that must be
be performed. performed.

Do not use the product in explosive or corrosive environments, in the presence of flammable gases,
in places subjected to splashing water, or near combustibles. Doing so may result in fire, electric
shock or injury.
Do not transport, install the product, perform connections or inspections when the power is on.
Always turn off the power before carrying out these operations. Accidental contact may result in
electric shock.
Do not forcibly bend, pull or pinch the cable. Doing so may cause fire or electric shock.
Do not touch the main circuit terminal of the speed controller immediately after the power is turned
off (for a period of 1 minute). The residual voltage may cause electric shock.
Do not disassemble or modify the speed controller. Doing so may result in electric shock or injury.
Only qualified and educated personnel should be allowed to perform installation, connection,
operation and inspection/troubleshooting of the product. Handling by unqualified and uneducated
personnel may result in fire, electric shock or injury.
Install the motor and speed controller in the enclosure in order to prevent electric shock or injury.
Use the speed controller which power supply voltage is the same as that of the motor. Failure to do
so may result in fire or damage to equipment.
The speed controller has no built-in fuse for overcurrent protection. Be sure to connect a device for
overcurrent protection (e.g. fuse) in the power input line. Failure to do so may result in fire.
Connect the cables securely according to the wiring diagram in order to prevent fire or electric
shock.
Be sure to observe the specified cable sizes. Use of unspecified cable sizes may result in fire.
Turn off the speed controller power in the event of a power failure. Or the motor may suddenly start
when the power is restored and may cause injury or damage to equipment.

−4−
 Precautions for use

Do not use the speed controller beyond its specifications. Doing so may result in electric shock,
injury or damage to equipment.
Do not use the product in vertical drive (elevating application). Doing so may result in injury or
damage to equipment.
Keep the area around the speed controller free of combustible materials. Failure to do so may
result in fire or a skin burn(s).
Do not wire the electromagnetic contactor or power relay between the motor and speed controller.
To switch the rotation direction using the electromagnetic contactor may cause damage to
equipment.
Do not conduct insulation resistance measurement or dielectric strength test on the speed
controller. Failure not to do so may result in injury or damage to equipment.
If an alarm of the speed controller is generated, remove the cause before resetting the alarm.
Failure to do so may result in injury or damage to equipment.
Use this speed controller in combination with an Oriental Motor's speed control motor equipped
with an overheat protection device. Failure to do so may result in fire.
Provide an emergency-stop device or emergency-stop circuit external to the equipment so that the
entire equipment will operate safely in the event of a system failure or malfunction. Failure to do so
may result in injury.
If abnormal conditions occurred, stop the operation immediately and turn off the speed controller
power. Failure to do so may result in fire, electric shock or injury.
Dispose the product correctly in accordance with laws and regulations, or instructions of local
governments.

3 Precautions for use

WARNING FOR USE ON SPEED CONTROLLER (UL-certified)
• Maximum surrounding air temperature 50 °C (122 °F).
• DC voltage source shall be of Class 2 type.
• Install device in pollution degree 2 environment.
• Always use this speed controller in combination with a compatible motor by Oriental Motor. The
compatible motors listed in this manual are recognized by UL and provide an overheat protection
function based on thermal protection or impedance protection.
• Connect the cables securely according to the wiring diagram.

−5−
Installation

4 Installation
This chapter explains the installation location, installation methods and measures against noise of the
speed controller.

4.1 Location for installation

The speed controller is designed and manufactured to be installed within another device. Install it in
a well-ventilated location that provides easy access for inspection. The location must also satisfy the
following conditions:
• Inside an enclosure that is installed indoors • Area not subject to splashing water (rain, water
• Operating ambient temperature 0 to +50 °C droplets), oil (oil droplets) or other liquids
[+32 to 122 °F] (non-freezing) • Area free of excessive salt
• Operating ambient humidity 85% or less • Area not subject to continuous vibration or
(non-condensing) excessive shocks
• Area that is free of explosive atmosphere or • Area free of excessive electromagnetic noise
toxic gas (such as sulfuric gas) or liquid (from welders, power machinery, etc.)
• Area not stored combustible materials • Area free of radioactive materials, magnetic fields
• Area not exposed to direct sun or vacuum
• Area free of excessive amount of dust, iron • Altitude Up to 1000 m (3300 ft.) above sea level
particles or the like

Note If the ambient temperature of the speed controller exceeds the upper limit of the operating
ambient temperature, revise the ventilation condition or forcibly cool the area around the
speed controller using a fan in order to keep within the operating ambient temperature.

4.2 Installation method

Use a DIN rail 35 mm (1.38 in.) wide to mount the speed controller.
The speed controller is designed so that heat is dissipated via air convection. Provide spaces so that the
speed controller can be ventilated well through its top and bottom vent holes.
Push down the speed controller's DIN lever until it locks. Hang the hook at the rear to the DIN rail, and
push in the speed controller. After installation, fix the both sides of the speed controller with the end
plate.

Hook

DIN rail
End plate
DIN lever

Removing from DIN rail

Pull the DIN lever down until it locks using a flat tip screwdriver, and lift the
bottom of the speed controller to remove it from the rail.
Use force of about 10 to 20 N (2.2 to 4.5 lb.) to pull the DIN lever to lock it.
Excessive force may damage the DIN lever.

−6−
 Installation

4.3 Installing an external potentiometer (Sold separately)

Install an accessory external potentiometer (sold separately) as shown below.
Variable resistor
Insulation sheet
Mounting plate

Dial plate • Reference mounting hole

Setscrew (M4) dimensions [Unit: mm (in.)]
Tightening torque: 7.5±0.4 (0.3±0.02)
0.4 N·m (3.5 lb-in)

Dial
Toothed washer Ø3 (0.12) Ø10 (0.39)

Nut
Tightening torque:
0.45 N·m (3.9 lb-in)

Soldering the variable resister terminals and the lead wires

Cover a heat-shrinkable tube over the soldered part to insulate.
235 °C (455 °F), less than 5 sec.
Dial Terminal
Variable resistor Heat-shrinkable tube

Lead wire
Solder (Pass the lead wire
Lead wire through the terminal hole and
give it two or three turns.)

4.4 Installing and wiring in compliance with EMC Directive

„„
EMC Directives
The speed controller is designed and manufactured as a component to be installed within another device.
The EMC Directives require that your mechanical equipment in which the speed controller is installed
satisfy the applicable requirements. The installation/wiring methods of the speed controller explained
here represent the basic methods that are effective in helping your mechanical equipment conform to the
EMC Directives. The final level of conformance of your mechanical equipment to the EMC Directives
will vary depending on the control system equipment used with the speed controller, configuration of
electrical parts, wiring, layout, hazard level, and the like. Therefore, you must conduct the EMC tests on
your mechanical equipment to confirm compliance.

„„
Applicable Standards
EN 55011 Group 1 Class A
EMI
EN 61000-6-4
EMS EN 61000-6-2
Caution: This equipment is not intended for use in residential environments nor for use on a low-voltage
public network supplied in residential premises, and it may not provide adequate protection to
radio reception interference in such environments.

Effective measures must be taken against the EMI that the speed controller may give to adjacent
control-system equipment, as well as the EMS of the speed controller itself, in order to prevent a serious
functional impediment in the machinery. The use of the following installation and wiring methods will
enable the speed controller to be compliant with the EMC Directive.
−7−
Installation

Connecting mains filter for power supply line

„„
• Connect a mains filter in the AC power supply input to prevent the noise generated in the speed
controller from propagating externally through the power supply line. For a mains filter, use MC1210
(TDK-Lambda Corporation) or equivalent product.
• Install the mains filter as close to the speed controller as possible. Use cable clamps and other means
to secure the input cables and output cables firmly to the surface of the enclosure. Connect the ground
terminal of the mains filter to the grounding point, using as thick and short a wire as possible.
• Do not place the input cable parallel with the output cable. Parallel placement will reduce mains filter
effectiveness if the enclosure's internal noise is directly coupled to the power supply cable by means of
stray capacitance.

„„
Connecting motor cable
When the motor cable is extended, use a cable of AWG18 (0.75 mm2) or more with a length of 10 m
(32.8 ft.) or less. When extending the rate generator lead wires, use a shielded cable.

„„
Ferrite core
Install a ferrite core in the power line and motor cable line to eliminate external electrical noise.
Use a ferrite core of 7427122 (Würth Elektronik GmbH & Co. KG), ZCAT3035-1330 (TDK
Corporation) or equivalent.
Install the ferrite core as close to the speed controller as possible.

„„
Wiring the control cable
Use a braided shielded cable of AWG24 (0.2 mm2) or more Recommended strip length for braided
for control cable, and keep the wiring distance as short as shielded cable
possible [less than 2 m (6.6 ft.)]. 4 mm (0.16 in.) or more

Sheath

Wire Braided shield

Insulation

To ground a shielded cable, use a metal that will maintain Shielded cable
contact with the entire circumference of the cable. Attach a Cable clamp
cable clamp as close to the end of the cable as possible, and
connect it as shown in the figure.

„„
Notes about installation and wiring
• Connect the motor, speed controller and other peripheral control equipment directly to the grounding
point so as to prevent a potential difference from developing between grounds.
• When relays or electromagnetic switches are used together with the system, use mains filters and CR
circuits to suppress surges generated by them.
• Keep cables as short as possible without coiling and bundling extra lengths.
• Wire the power cables away from the control cables by providing a minimum clearance of 100 mm (3.94
in.) between them. If they have to cross, cross them at a right angle. Place the input cable and output
cable of a mains filter separately from each other.

−8−
 Connection

„„
Example of motor and speed controller installation and wiring
Motor

Speed controller

Motor cable Ferrite

[10 m (32.8 ft.)] core

Cable
Mains
Cable Ferrite clamp
Power supply filter
cable clamp core
Control cable
[2 m (6.6 ft.)]

Grounded plate Capacitor

5 Connection
This chapter explains how to connect the speed controller and power supply, motor and I/O signals.

5.1 Connection example

The following figure is an example when connecting the motor of World K Series, and the motor is
operated with relays, switches and other contact switches. To operate the motor, be sure to connect
control DC power supply.
A 60 W type motor or larger is equipped with a built-in cooling fan. Connect two lead wires (orange
color) of the cooling fan to the AC power supply connection terminals (pin no. 8 and 9 of the TB1).
Motor
Speed controller
TB1

Blue 1 CN1
Blue 2 Control DC power supply
White 3 1 +24 V
24 VDC±10%
Red 4 2 0V 100 mA or more
Black 5
Capacitor 3 COM
6 4 FWD input
7 5 REV input
L (Live) 8 6 INT/EXT input
Power 7 ALARM-RESET input
supply N (Neutral) 9
11 SPEED-OUT output
12 ALARM-OUT output

−9−
Connection

„„
Connecting the main circuit terminal (TB1)
• Applicable cable size: AWG18 (0.75 mm2) or more* Applicable crimp terminal
2
* AWG20 to 14 (0.5 to 2.0 mm ) for capacitor connection
Ø3.2 (Ø0.13) or more
• Terminal block screw size: M3

6.2 (0.24)
or less
• Tightening torque: 0.8 N·m (7.0 lb-in)

Unit [mm (in.)]

•• TB1 pin assignments

Pin No. Terminal name Pin No. Terminal name
1 6
Rate generator connection terminals Capacitor connection terminals
2 7
3 8
AC power supply connection terminals
4 Motor connection terminals 9
5

„„
Connecting the control circuit terminal (CN1)
• Applicable cable size: AWG24 to 16 (0.2 to 1.25 mm2)
• Lead wire strip length eled: 7 mm (0.28 in.)
• Terminal block screw size: M2
• Tightening torque: 0.33 N·m (2.9 lb-in)
• The length of the cable should be less than 2 m (6.6 ft.) and wire the cable away from the power lines.
• Use a shielded cable or twisted pair shielded cable when setting the rotation speed externally.
•• CN1 pin assignments
Pin No. Signal type Signal name Description
1 Control power +24 V
Connect the 24 VDC for control circuit.
2 supply 0 V (GND)
3 Common COM (GND) I/O signals common
4 FWD The motor turns in the clockwise direction.
5 REV The motor turns in the counterclockwise direction.
Select the internal potentiometer or external potentiometer
6 INT/EXT
(external DC voltage).
Input
7 ALARM-RESET Alarms are reset.
8 VH
9 VM Connect when setting the speed externally.
10 VL (GND)
12 pulses are output with each revolution of the motor
11 SPEED-OUT
output shaft.
Output
This signal is output when an alarm generates
12 ALARM-OUT
(normally closed).

„„
Connecting the fuse
Be sure to connect a fuse or similar device in the power line to protect against overcurrent.
Single-phase 100/110/115 V 216 Series (Littelfuse,Inc.) 10 A or equivalent
Fuse rating
Single-phase 200/220/230 V 216 Series (Littelfuse,Inc.) 6.3 A or equivalent

Note Use the speed controller which power supply voltage is the same as that of the motor.

−10−
 Connection

„„
Connection diagram
The connection diagram shown here is an example that the operating speed is set using an external
speed potentiometer.
Speed controller
Power supply
Fuse
100-115 VAC 8 L Main circuit TB1 Blue 1 Rate
or
200-230 VAC 9 N Blue 2 generator
Circuit breaker
White 3
Control DC power supply +24 V Red 4 Motor
24 VDC±10% 1 Black 5
100 mA or more
2 6
Capacitor
0V 7
Setting the operating
speed VH
External 8 Control circuit CN1
VM
potentiometer 9 Speed command voltage
(sold separately) VL
10
0V
Shielded wire
+24 V
Enclosure
Input signals ∗1 4.7 kΩ
FWD
4 Output
REV
5 Input circuit circuit ∗2
INT/EXT 11 SPEED-OUT
6 ∗2
ALARM-RESET 12 ALARM-OUT
7
COM 0V
3 3 COM
0V 0V 30 VDC
or less

*1 For relays or transistors connecting to the input signals, use those of leakage current 1 mA or less.
*2 Connect external resistors so that the SPEED-OUT output and ALARM-OUT output are kept below 10 mA
and 40 mA respectively.

−11−
Connection

5.2 I/O signals

„„
Input signals
The speed controller input signals are photocoupler inputs.

„„
Output signals
The speed controller output signals are transistor/open-collector output. Connect the current-limiting
resistor to keep the SPEED-OUT output and ALARM-OUT output at maximum 10 mA and 40 mA,
respectively.
•• Recommended current-limiting resistor
Input power supply voltage For SPEED-OUT output For ALARM-OUT output
24 VDC 3.3 kΩ to 3.9 kΩ (2 W) 820 Ω to 3.9 kΩ (2 W)
5 VDC 680 Ω to 820 Ω (0.5 W) 150 Ω to 820 Ω (0.5 W)

Note •• Always connect a current-limiting resistor. If the power supply voltage is connected to
the output circuit directly without connecting a current-limiting resistor in between, the
speed controller will be damaged.
•• When connecting a relay (inductive load), etc., to detect
alarm outputs, use a relay with built-in flywheel diode, Inductive load
or provide a fly-back voltage control measure based on Flywheel
ALARM
diode, etc., for the inductive load. diode
-OUT

•• SPEED-OUT output
12 pulses are output with each revolution of the motor output shaft synchronously with the motor
operation (pulse duty: approx. 50%). The motor operating speed can be calculated by checking the
SPEED-OUT output frequency.
SPEED-OUT output frequency [Hz] T
Motor operating speed [r/min] = × 60
1 12
SPEED-OUT output frequency =
T
1
When a gearhead is used: Motor operating speed ×
Gear ratio

„„
Using a external control equipment with a built-in clamp diode
If a external control equipment with a built-in clamp External control
diode is used, a leakage path may form and cause equipment Speed controller CN1
the motor to operate even when the external control VCC
+24 V
equipment power is off, as long as the speed controller
power is on. Since the power capacity of the external Clamp
diode 4 to 7
control equipment is different from that of the speed
controller, the motor may operate when the external 3
control equipment and speed controller powers are
turned on or off simultaneously. When powering down, 0V
0V
turn off the speed controller power first, followed by
the external control equipment power. When powering up, turn on the external control equipment power
first, followed by the speed controller power.

−12−
 Basic operations

6 Basic operations
This chapter explains the basic operations of the speed controller.

6.1 Run/stop
When turning the FWD input or REV input ON, the motor will rotate at the set speed.
When turning the FWD input or REV input OFF while the motor operates, the motor will coast to a
stop.
When turning the FWD input and REV input ON simultaneously, the motor will stop instantaneously.

Note Do not operate the motor in vertical drive (gravitational operation).

6.2 Setting the operating speed

The setting range is from 90 to 1400 r/min at 50 Hz or 90 to 1600 r/min at 60 Hz.
There are three methods to set the operating speed; internal potentiometer, external potentiometer and
external DC voltage.

„„
Setting by internal potentiometer
Use a precision screwdriver to turn the internal Internal potentiometer
potentiometer (VR1). Turn the potentiometer (VR1)
clockwise to increase the speed.
Factory setting: 0 r/min

„„
Setting by external potentiometer (sold separately)
When the speed is set away from the speed controller, External potentiometer
connect the external potentiometer (sold separately) Low High
to CN1. When the INT/EXT input is turned ON, the
external potentiometer is enabled.
Turn the potentiometer clockwise to increase the 8 VH input 1 2 3
speed. 9 VM input
10 VL input

„„
Setting with external DC voltage
Set either 5 or 10 VDC for the external DC voltage. Speed command voltage
Select the speed command voltage select switch select switch (SW1-1)
(SW1-1) to set which voltage to be used. 5 VDC is OFF: 5 VDC
set when the switch is set to the OFF position, and ON: 10 VDC
10 VDC is set when the switch is set to the ON
position.
Factory setting: 5 VDC (OFF) External DC voltage
For the external voltage, use a DC power supply 9 VM input 0 to 5 VDC
(0 to 5 VDC or 0 to 10 VDC) with reinforced 10 VL input
or
0 to 10 VDC
insulation on both the primary side and secondary
1 mA or more
side, and connect it to the CN1.

Note Be sure to set the external DC voltage to either 5 VDC or less, or 10 VDC or less. When
connecting the external DC power supply, make sure the polarities are correct. If the
polarities are reversed, the speed controller may be damaged.

−13−
Basic operations

„„
Operating speed characteristics (representative values)
Internal potentiometer External potentiometer External DC voltage
1800 1800 1800
Operation speed [r/min]

Operation speed [r/min]

Operation speed [r/min]

1500 1500 1500

1000 1000 1000

500 500 500

0 2 4 6 8 10 0 20 40 60 80 100 0 1 2 3 4 5
Dial Dial 0 2 4 6 8 10
60 Hz
50 Hz DC voltage [V]

6.3 Setting the acceleration time and deceleration time

The acceleration/deceleration time can be adjusted to prevent the load from receiving a shock upon
starting, stopping or a change in speed.
The acceleration time and deceleration time are effective for all speed settings.
The setting range is approx. 0.3 to 15 seconds (at 1000 r/min, with no inertial load).
•• Acceleration time (Factory setting: Min.)
The acceleration time is actuated at start or when the speed is switched to the higher setting in a 2-speed
operation. Turning the acceleration time potentiometer (VR2) clockwise increases the time.
•• Deceleration time (Factory setting: Min.)
The deceleration time is actuated at natural stop or when the speed is switched to the lower setting in a
2-speed operation. Turning the deceleration time potentiometer (VR3) clockwise increases the time.

„„
Characteristics (representative values)
Setting the acceleration time Setting the deceleration time
Deceleration time [s/1000 r/min]
Acceleration time [s/1000 r/min]

15 15

10 10

5 5

0 2 4 6 8 Max. 0 2 4 6 8 Max.
Dial Dial

* However, when the load inertia is large, the deceleration time cannot be set at a shorter time than how long it
takes for the motor to coast to a stop.

6.4 2-speed operation

Operation can be performed at two speeds through use of both the internal potentiometer and external
potentiometer (external DC voltage) by switching the INT/EXT input. For details, refer to following
timing chart.

−14−
 Basic operations

6.5 Timing chart

The chart below is an example of setting the internal potentiometer to 1200 r/min and external
potentiometer to 100 r/min and switching the speed between these two levels.
ON
FWD input
OFF
10 ms or more
ON
REV input
OFF
ON
INT/EXT input
OFF
Run/Speed change/ Run/ Rotation direction change/
Stop Instantaneous stop Instantaneous reverse

1200 r/min
Accelerate at
CW direction the set time
100 r/min

Motor operation

CCW direction Decelerate

instantaneously

Note •• Make sure each signal remains ON for at least 10 ms.

•• When switching the FWD input and REV input, provide an interval of at least 10 ms.
•• If the power supply is turned on while the FWD input or REV input is being ON, the
motor will rotate. Turn on the power supply after turning the FWD input and REV input
OFF, so that the motor will not rotate suddenly when the power is turned on.
•• To change rotation direction of the induction motor, wait until the motor completely
stops.

6.6 Multi-motor control

Two or more motors can be operated at the same speed by using a single external potentiometer
(external DC voltage).

„„
Using an external potentiometer
Connect the speed controller as shown below. When performing multi-motor control using the external
potentiometer, the number of speed controllers should not exceed 20 units.
• Connect the external I/O signals to each speed controller.
• If the speed will vary among the respective motors, make adjustments as follows;
Speed controller 1: Connect a resistor of 1.5 kΩ, 1/4 W to VM terminal
Speed controller 2 and subsequent speed controllers: Connect a variable resistor VRn of 5 kΩ, 1/4 W
2 Control line
3 1
VRx Speed controller 1 Speed controller n
CN1 CN1 VRn
1.5 kΩ 5 kΩ 1/4 W
TB1 VH 1/4 W TB1 VH
L VM L VM
N VL N VL

Power supply line

−15−
Basic operations

Resistance (VRx) when the number of speed controllers is n:

Resistance (VRx) = 20/n (kΩ), n/4 (W)
Example: If two speed controllers are used
Resistance (VRx) = 20/2 (kΩ), 2/4 (W), resistance (VRx) is calculated as 10 kΩ, 1/2 W.

„„
Using external DC voltage
Connect the speed controller as shown below.
• Connect the external I/O signals to each speed controller.
• If the speed will vary among the respective motors, make adjustments as follows;
Speed controller 1: Connect a resistor of 1.5 kΩ, 1/4 W to VM terminal
Speed controller 2 and subsequent speed controllers: Connect a variable resistor VRn of 5 kΩ, 1/4 W
DC power supply
0 to 5 VDC Control line
or
0 to 10 VDC
Speed controller 1 Speed controller n VRn
1.5 kΩ 5 kΩ 1/4 W
TB1 CN1 1/4 W TB1 CN1
L VM L VM
N VL N VL

Power supply line

Current capacity (I) of external DC power supply when the number of speed controllers is n:
Current capacity (I) = 1 × n (mA)
Example: If two speed controllers are used
Current capacity (I) = 1 × 2 (mA), current capacity (I) is calculated as 2 mA or more.

6.7 Repeated cycle of operation/instantaneous stop

When operating/instantaneous stop of the motor is repeated in short cycles, the rise in motor temperature
will increase and the continuous-operation time will be limited.
Use the motor at the repetition cycle shown below.
6 W to 40 W: 2 seconds (operation 1 second, standstill 1 second)
60 W and 90 W: 4 seconds (operation 2 seconds, standstill 2 seconds)

6.8 Braking current at instantaneous stop

When turning the FWD input and REV input ON simultaneously, the braking current flows for
0.4 seconds and the motor stops instantaneously. Since the following current will flow when the motor
stops instantaneously, use the power supply which current capacity is large enough.
Braking current (Peak value)
Motor output
power Single-phase Single-phase
100/110/115 V 200/220/230 V
6W 2A 1A
15 W 4A 3A
25 W 8A 4A
40 W 12 A 7A
60 W 22 A 9A
90 W 29 A 13 A

−16−
 Alarms

7 Alarms
When the protective function is actuated and an alarm generates, the ALARM-OUT output will turn
OFF. The motor coasts to a stop and once the motor has stopped, the motor output shaft becomes free.
At the same time, the ALARM LED will start blinking. The cause of the alarm can be checked by
counting the number of times the ALARM LED blinks.
The ALARM LED will illuminate briefly when the control DC power is turned on. This is not a
malfunction.
0.3 s 0.3 s
Example: Timing chart for blinking LED when
the motor lock alarm is generated Interval

„„
Alarm list
No. of
ALARM Alarm type Cause Remedial action
LED blinks
•• The motor output shaft was locked for a
minimum of 5 seconds.
•• The tachogenerator lead wire or motor
2 Motor lock power line of the motor cable occurred
disconnection or poor connection. •• Reduce the load.

•• The capacitor was not connected or •• Improve the operation

occurred poor connection. condition such as the
acceleration time or
•• The motor abnormally produced heat deceleration time.
from any cause, and a built-in overheat
protection device (thermal protector) of the •• Check the connections of
motor was activated (OPEN). the motor connector part
9 Motor overheat and capacitor.
•• The motor power line occurred
disconnection or poor connection.
•• The capacitor is connected wrongly (short
circuited).

„„
How to reset the alarm
To reset an alarm, be sure to remove the cause of the alarm and then perform one of the following
operations:
• Turn the ALARM-RESET input ON for at least 10 ms.
• Cycle the control DC power.

Note •• Be sure to remove the cause of the alarm and then reset the alarm.
•• Alarms cannot be reset if the FWD input or REV input is ON.
The ALARM-RESET input is enabled only while the motor is stopped.

−17−
Inspection

„„
Timing chart
The timing chart shown here is an example when the thermal protector is activated and the motor
overheat alarm is generated.
AC power supply ON
Control DC power supply OFF
Approx. 100 ms or more 10 ms or more*3
ON
FWD input or REV input
OFF
OPEN
Thermal protector
CLOSE
0.3 s 0.3 s 1s 1s
Lit
ALARM LED *1
OFF
ON
ALARM-OUT output
OFF
10 ms or more
ON
ALARM-RESET input *2
OFF

Motor operation

*1 When closing the thermal protector while the AC power supply has been turned ON, the blinking rate of
the ALARM LED will be slower.
*2 Although the ALARM-OUT output is turned ON if the thermal protector was closed, the operation will not
restart until the alarm is cleared by the ALARM-RESET input.
*3 To restart the motor, wait for at least 10 ms and then turn any of the input signal for operation ON.

8 Inspection
It is recommended that periodic inspections be conducted for the items listed below after each operation
of the motor. If an abnormal condition is noted, discontinue any use and contact your nearest office.

„„
During inspection
• Are there any scratches, signs of stress in the cable?
• The openings in the speed controller are not blocked.
• The main circuit terminal screws and control circuit terminal screws are not loose.

Note The speed controller uses semiconductor elements, so be extremely careful when
handling them. Static electricity may damage the speed controller.

−18−
 Troubleshooting and remedial actions

9 Troubleshooting and remedial actions

During motor operation, the motor or speed controller may fail to function properly due to an improper
speed setting or wiring. When the motor cannot be operated correctly, refer to the contents provided in
this section and take appropriate action. If the problem persists, contact your nearest office.

Note Certain items must be checked with the power on. Be careful not to touch any live
connections.

Phenomenon Possible cause Remedial action

Both the FWD input and REV input
are OFF. Turn either FWD input or REV input
Both the FWD input and REV input ON.
are ON.
The internal potentiometer or
The factory setting is 0 r/min. Turn the
external potentiometer is not
potentiometer clockwise.
adjusted.
•• The motor does not operate.
The INT/EXT input is ON when
•• The speed doesn't change. using the internal potentiometer.
Turn the INT/EXT input OFF.

The external potentiometer is not

Check the connection.
connected correctly.
The INT/EXT input is OFF when
Turn the INT/EXT input ON.
using the external potentiometer.
The motor or capacitor is not
Check the connection.
connected correctly.
The speed command voltage
select switch (SW1-1) is being ON
when the external potentiometer is
The motor speed does not used. Turn the speed command voltage
change to the set speed. The speed command voltage select switch (SW1-1) to OFF.
select switch (SW1-1) is being ON
when the speed command voltage
is 0 to 5 VDC.
The motor is rotating at the
The rate generator is not
maximum speed, while the Check the connection.
connected correctly.
speed cannot be changed.
•• Motor operation is unstable. See p.7 for measures with regard to
Effect of electrical noise.
•• Motor vibration is too great. noise.

The motor doesn't start The acceleration time is too long. Adjust the acceleration potentiometer.
instantaneously. Load inertia may be excessive. Reduce the load inertia.
The motor doesn't stop Increase the frictional load or reduce
Load inertia may be excessive.
instantaneously. the load inertia.

−19−
• Unauthorized reproduction or copying of all or part of this manual is prohibited.
If a new copy is required to replace an original manual that has been damaged or lost, please contact
your nearest Oriental Motor branch or sales office.
• Oriental Motor shall not be liable whatsoever for any problems relating to industrial property rights
arising from use of any information, circuit, equipment or device provided or referenced in this
manual.
• Characteristics, specifications and dimensions are subject to change without notice.
• While we make every effort to offer accurate information in the manual, we welcome your input.
Should you find unclear descriptions, errors or omissions, please contact the nearest office.
• is a registered trademark or trademark of Oriental Motor Co., Ltd., in Japan and
other countries.
Other product names and company names mentioned in this manual may be registered trademarks
or trademarks of their respective companies and are hereby acknowledged. The third-party products
mentioned in this manual are recommended products, and references to their names shall not be
construed as any form of performance guarantee. Oriental Motor is not liable whatsoever for the
performance of these third-party products.
© Copyright ORIENTAL MOTOR CO., LTD. 2012

Published in June 2021

• Please contact your nearest Oriental Motor office for further information.

Technical Support Tel:800-468-3982 Singapore Korea

8:30am EST to 5:00pm PST（M-F） Tel:1800-842-0280 Tel:080-777-2042
www.orientalmotor.com www.orientalmotor.com.sg www.inaom.co.kr

Schiessstraße 44, 40549 Düsseldorf, Germany Tel:1800-806-161 4-8-1 Higashiueno, Taito-ku, Tokyo
Technical Support Tel:00 800/22 55 66 22 www.orientalmotor.com.my 110-8536 Japan
www.orientalmotor.de Tel:+81-3-6744-0361
www.orientalmotor.co.jp
Tel:1800-888-881
Tel:+44-1256347090 www.orientalmotor.co.th
www.oriental-motor.co.uk
Tel:1800-120-1995 (For English)
Tel:+33-1 47 86 97 50 1800-121-4149 (For Hindi)
www.orientalmotor.fr www.orientalmotor.co.in

Tel:+39-02-93906347 Tel:0800-060708
www.orientalmotor.it www.orientalmotor.com.tw

Tel:400-820-6516
www.orientalmotor.com.cn