Conzerv EM6400 Series Power Meters

User manual
CTD7303
01/2011
2 © 2011 Schneider Electric. All rights reserved.
Hazard Categories and Special Symbols
Read these instructions carefully and look at the equipment to become
familiar with the device before trying to install, operate, service or maintain it.
The following special messages may appear throughout this manual or on the
equipment to warn of potential hazards or to call attention to information that
clarifies or simplifies a procedure.

SAFETY SYMBOLS

The addition of either symbol to a ―Danger‖ or ―Warning‖ safety label indicates

that an electrical hazard exists which will result in personal injury if the
instructions are not followed.

This is the safety alert symbol. It is used to alert you to potential personal
injury hazards. Obey all safety messages that follow this symbol to avoid
possible injury or death.

SAFETY MESSAGES

DANGER indicates an imminently hazardous situation which, if not avoided, will

result in death or serious injury.

WARNING indicates a potentially hazardous situation which, if not avoided, can

result in death or serious injury.

CAUTION indicates a potentially hazardous situation which, if not avoided, can

result in minor or moderate injury.

CAUTION used without the safety alert symbol, indicates a potentially hazardous
situation which, if not avoided, can result in property damage.

OTHER SYMBOLS

This symbol indicates direct and alternating currents

This is double insulation symbol which indicates that, the user-accessible area
is protected throughout by double insulation or reinforced insulation.

© 2011 Schneider Electric. All rights reserved. 3

 PLEASE NOTE
Electrical equipment should be installed, operated, serviced, and maintained
only by qualified personnel. No responsibility is assumed by Schneider
Electric for any consequences arising out of the use of this material.

4 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Table of contents

Chapter 1 – EM6400 Series Power Meters Product Description ....................................................................7

Physical Description ..........................................................................................................................................7
Front Panel......................................................................................................................................................8
Eight-segment LED display ..........................................................................................................................8
Analog Load Bar ..........................................................................................................................................8
The Indicators – Kilo, Mega, and Negative ..................................................................................................9
Smart Keys .................................................................................................................................................10
Keypad Operation ......................................................................................................................................11
Auto-scroll ..................................................................................................................................................12
Default Display (View) Page ......................................................................................................................12
Rear Panel ....................................................................................................................................................13
Models and Parameters with EM6400 Series Power Meters ..........................................................................14
EM6400 Series Power Meters Technical Specification ...................................................................................16
Chapter 2: Safety Precautions ........................................................................................................................17
Chapter 3: Quick Start Guide ..........................................................................................................................19
PROG Menu — Setup .....................................................................................................................................19
Quick setup – While powering ON ................................................................................................................19
Enter Setup Menu in View (Read-Only) Mode ..............................................................................................21
Enter Setup Menu in Edit Mode ....................................................................................................................21
Setup Parameters in View and Edit Modes ..................................................................................................22
Edit Set Parameters in PROG Menu ............................................................................................................24
Edit and Accept Setup ...............................................................................................................................24
Save the New Value to Setup ....................................................................................................................25
Clear INTG and Maximum Demand (MD) ....................................................................................................26
Energy Integrator .............................................................................................................................................28
Integrator Overflow .......................................................................................................................................28
OLD Data Register .....................................................................................................................................28
Demand Power Calculation Methods ..............................................................................................................29
Auto (sliding block) .....................................................................................................................................29
User (fixed block) .......................................................................................................................................29
EM6400 Series Power Meters Menu Hierarchy ..............................................................................................30
EM6459 Meter Menu Hierarchy ....................................................................................................................30
EM6433 Power Meter Menu Hierarchy .........................................................................................................31
EM6436 Power Meter Menu Hierarchy .........................................................................................................32
EM6434 Power Meter Menu Hierarchy .........................................................................................................33
EM6400 Power Meter Menu Hierarchy .........................................................................................................34
Chapter 4: AC Power Measurement ................................................................................................................37
3-Phase Systems .............................................................................................................................................37
Consumption and Poor Power Factor .............................................................................................................38
―3D‖ kVA Measurement ...................................................................................................................................38
Chapter 5: Installation ......................................................................................................................................39
Mechanical Installation ....................................................................................................................................39
Installation Procedure ...................................................................................................................................40
Usage .........................................................................................................................................................40
Panel Considerations and Environment ....................................................................................................40
Viewing .......................................................................................................................................................40
Mounting ....................................................................................................................................................41
Electrical Installation ........................................................................................................................................42
Terminal connections using lugs...................................................................................................................43
Auxiliary Supply (Control Power) ..................................................................................................................44
PTs (VTs) and CTs .......................................................................................................................................44
PT (VT), CT Wiring.....................................................................................................................................44
Voltage Signal Connections ..........................................................................................................................45
PT Connections..........................................................................................................................................45
Selecting the voltage fuses ........................................................................................................................45
Current Signal Connections ..........................................................................................................................45

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EM6400 Series Power Meters CTD7303
Table of contents 01/2011

CT Connections .........................................................................................................................................46
CT Polarity .................................................................................................................................................46
CT Connection Reversal ............................................................................................................................46
Setup — System Type ..................................................................................................................................47
Phase Labels ................................................................................................................................................48
Connection Diagrams ...................................................................................................................................48
Connection Diagram Symbols ...................................................................................................................48
3-phase 4-wire WYE connection................................................................................................................48
3-phase 3-wire delta connection ................................................................................................................49
3-phase 3-wire open delta connection .......................................................................................................49
Figure 5-5: 3-phase 3-wire open delta connection ....................................................................................49
2-phase 3-wire connection .........................................................................................................................50
Single-phase connection ............................................................................................................................50
Chapter 6: Data Communication .....................................................................................................................51
RS 485 Data Port .............................................................................................................................................51
Installation ........................................................................................................................................................51
Communication Capabilities ............................................................................................................................52
Daisy-chaining Devices to the Power Meter ....................................................................................................52
Data Formats and Settings ..............................................................................................................................53
Parameter Settings for Different SCADA Software.......................................................................................54
Communication Test .....................................................................................................................................55
Data Address ................................................................................................................................................57
Individual Parameter Address ....................................................................................................................57
Block Parameter Address ..........................................................................................................................59
Chapter 7: Maintenance and Troubleshooting ..............................................................................................67
Introduction ......................................................................................................................................................67
Troubleshooting ...............................................................................................................................................68
Appendix A – Technical Data ..........................................................................................................................71
Accuracy ..........................................................................................................................................................71
Auxiliary supply (Control power) ......................................................................................................................71
Front Panel Display .........................................................................................................................................71
Installation and Input Ratings ..........................................................................................................................72
Environmental Conditions ................................................................................................................................72
Construction .....................................................................................................................................................72
Dimensions and Shipping .............................................................................................................................72
Appendix B: SIM (simulation) Mode ...............................................................................................................73
Appendix C: Glossary ......................................................................................................................................75
Terms ............................................................................................................................................................75
Abbreviations ................................................................................................................................................77
INDEX .................................................................................................................................................................79

6 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 1 – EM6400 Series Power Meters Product Description

Chapter 1 – EM6400 Series Power Meters

Product Description
The EM6400 series power meters are digital power meters that offer
comprehensive 3-phase electrical instrumentation and load management
facilities in a compact and rugged package.

This chapter contains the main operating instructions. The remaining

chapters explain the installation and setup steps before the power meter is
ready for use, and maintenance and troubleshooting procedures for the
power meter after installation.

The EM6400 series power meter is an universal power meter. Before use,
please program the SYS (measurement system configuration) and the PT
(VT) and CT ratios through the front panel keys. Otherwise, it will read your
system incorrectly. Other settings, such as communication parameters, must
also be programmed as needed.

Schneider Electric stands behind your EM6400 power meters with complete
user support and service.

Intended use: EM6400 series power meter is designed for use in industrial
and commercial installations by trained and qualified professionals, not for
domestic use.

Physical Description
FRONT: The front panel has three rows of four digits/characters each, with
auto scaling Kilo (K), Mega (M), and minus (-) indications. The K and M
indicators lit together to show Giga readings. The load bar graph to the right
of the display gives the indication of consumption in terms of the % amperes
load with respect to the full scale (FS) selected. Five smart keys make
navigating the parameters very quick and intuitive for viewing data and
configuring the power meter.

REAR: The voltage and current terminals and the communication port are
located on the back of the power meter. Refer to ―Rear Panel‖ on page 13
for more information.

© 2011 Schneider Electric. All rights reserved. 7

EM6400 Series Power Meters CTD7303
Chapter 1 – EM6400 Series Power Meters Product Description 01/2011

Front Panel
The front panel contains the following indicators and controls:
Eight-segment LED display: Three rows of alphanumeric displays, four
digits each, display three RMS parameters simultaneously or one energy
parameter. The displayed readings update every second.
Analog load bar: Unique indication of % load with respect to the full scale
(FS).
Indicators: For each row Kilo, Mega (Kilo + Mega = Giga) indicators, and
a Negative (-) indicator.
Keys: Five smart keys to scroll through the display pages.

Figure 1-1: Parts of EM6400 series power meter front panel

Eight-segment LED display

Four line, three digits, eight-segment LED display.
The power meter displays the parameter name prominently right on the
large, alphanumeric readouts.
The power meter displays the parameter name for two seconds and then
the value for eight seconds. The parameter name is also displayed each
time when you press a key. This helps the user to know which parameter
is currently displayed.
This method also allows programmable phase soft-Labels in the power
meters. You can choose from 123 (factory setting), ABC, RYB, PQR or
RST.

Analog Load Bar

Unique indication of total load % with respect to the full scale through the 12
LEDs at the right side of the display.
This is bar graph, where each LED indicates 10% of load.
To find the total load, count the number of illuminated LEDs, and then
multiply by 10.

Table 1-1: Load percentage and bar graph indication

Load Bar graph display

percentage
Less than No LEDs are lit.
10%
Between 10 to Amber LEDs are lit.
40 %
Between 50 to Green LEDs are lit to indicate that the load is acceptable and should not
80% be increased further.
Above 80% Red LEDs are lit to indicate that the load has exceeded the sanctioned
limit and is dangerous.

8 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 1 – EM6400 Series Power Meters Product Description

The Indicators – Kilo, Mega, and Negative

Table 1-2 Indicators

Kilo: When lit, indicates that the reading is in Kilo (103). 10,000 is displayed
as 10.00 K and 1.0 K as 1000.

Mega: When lit, indicates that the reading is in Mega, (106). 10,000 K is
shown as 10.00 M. and 1.0 M as 1000 K.

Giga: When Kilo and Mega are lit together, the reading is in Giga (109).
10,000 M is shown as 10.00 G and 1.0 G as 1000 M.

Negative: When lit, indicates that the reading is negative as per IEEE 100
and industry standard practice.
When PF (power factor) is lead (capacitive load): Both PF and VAR
(reactive power) sign will be negative. When current is reversed: W (active
power) is negative.

Table 1-3: Giga, Mega (M), Kilo (K), and decimal point scaling

RMS Reading Indicator

Less than 0.001 K, M OFF, displays 0.000

Less than 9999 K, M OFF

Above 9999 K ON, M OFF
Above 9999 K M ON, K OFF
Above 9999 M Giga (k + M indicators ON)
Up to 9999 G Giga
Above 9999 G Display shows Hi for positive numbers, Lo for negative numbers

RMS readings are four digits. Energy readings have eight digits, including
four additional fractional digits. The maximum number the power meter
handles is 9,999 G for RMS and energy values.

This means that the energy readings of the power meter will overflow at
three values of Wh (active energy) or VAh (Apparent energy) (selectable
through PROG menu - setup) depending upon the PT (VT) and CT ratios
programmed.

© 2011 Schneider Electric. All rights reserved. 9

EM6400 Series Power Meters CTD7303
Chapter 1 – EM6400 Series Power Meters Product Description 01/2011

Smart Keys
Operating the power meter is easy, using the five smart keys to navigate
through the display pages. The display pages expand as you go to the right,
much like the directory or explorer tree displayed on any computer. The
display shows where you are headed.

Table 1-4: Smart keys description

Right Key
Go forward into sub-parameter pages.
Going right past EDIT in SET and CLR requires code entry to enter
PROG menu (setup and clear)
During setup, select next (right side) digit.
Left Key:
Go back towards to the main parameter pages.
During edit setup, selects previous (left side) digit
Exits from Edit mode, back to the PROG menu – setup.
The meter enters the SIM (simulation) mode when you press the left
key continuously during the powerup of the power meter. See ―SIM
(Simulation) mode‖ on page 73 for more information.
Up Key:
Scroll up through display pages at the same level, within the same
function.
Continuous pressing for three seconds initiates limited auto-
scroll (within the same function). See ―Auto-scroll‖ on page 12
for more information.
While editing, increases the value of the blinking/selected digit.
Down Key:
Scroll down through other display pages at the same level, through
all functions.
Continuous pressing for three seconds initiates the full auto-
scroll mode, through all functions. See ―Auto-scroll‖ on page 12
for more information.
While editing, decreases the value of the blinking/selected digit.
TURBO Key:
TURBO key is simple one touch access to the most commonly used
parameters pages (factory set). The TURBO pages for EM6400
series power meters are given below.
EM6400: RMS (home page), VLL, A, PF VLN, A, F VA, W, PF
VA, W,VAR W, VAR, PF PF1, PF2, PF3, V% 1 2 3, A % 1 2 3, VAd
RD TR, MD HR, VAh, Wh, RVAh, RWh, tVAh, tWh.
EM6433: RMS (home page), A, W, Wh.
EM6459: RMS (home page), VLL A PF, VLN A F.
EM6434: RMS (home page), VA W PF, VA W VAR, W VAR PF PF1
PF2 PF3 VAh and Wh.
EM 6436: RMS (home page), 'VLL, A, PF‘ 'VLN, A, F‘, ‗A, W, PF‘, 'PF1,
PF2, PF3‘, Wh, and Run.h.
If you‘re lost, the TURBO key is a quick way to get back to the RMS
home page.
Continuous pressing for three seconds initiates auto scrolling through
the above TURBO pages. See ―Auto-scroll‖ on page 12 for more
information.
During the powerup, if the TURBO key is pressed, the power meter
goes directly in to PROG menu – Setup. This is the easiest way to
enter in to the setup menu. See ―Quick setup – While powering on‖ on
page 19 for more information.

10 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 1 – EM6400 Series Power Meters Product Description

Keypad Operation
Press the key in the direction you want to go. The display shows where you
are headed. Press the key that takes you in the desired direction.

The following example explains how to navigate from the RMS page to the
VLN A F page and back to the RMS page in the EM6400 power meter.

Navigation Concept

RMS VLL V12

A 23
PF 31

VLN
A
F

1. From the RMS page, press . The display shows VLL

A
PF
2. Now press .The display shows VLN
A
F
3. To return to RMS, press .The display shows RMS.

Use to go forward to the sub-parameter page and use to go

backward to the main parameter pages. Use and to scroll up and
down through the display pages.

Now, try getting around to other parameters, by moving up, down, right,
and left. The readings are organized as display pages to the right of RMS
and INTG.
The Kilo, Mega, and Negative Indicators are automatic. Kilo and Mega
light up together to show Giga. See ―The indicators‖ on page 9 for more
information.
You cannot go right into CLR, to clear INTG and MD values, unless you
enter a code.
Going right through SET, you can go down to VIEW or EDIT. Going right
through EDIT requires code entry to program these power meter settings.
When done:
Go Left all the way back to SET.
Go down to CLR.
Go Right into RMS to view the display pages again.

© 2011 Schneider Electric. All rights reserved. 11

EM6400 Series Power Meters CTD7303
Chapter 1 – EM6400 Series Power Meters Product Description 01/2011

Auto-scroll
Auto-scroll allows you to monitor a group of display pages sequentially,
every five seconds, without manual key operation. This is convenient for
viewing from a distance. The power meter shows the parameter name for
one second followed by the value for four seconds.

To auto-scroll within a page group (e.g., Within RMS group)

Go to a particular page in the desired page group. Press continuously
for three seconds and then release. The display flashes AUTO and starts
auto-scroll within the page group.
To auto-scroll down the entire column of pages
Go to the desired page. Press continuously for three seconds and then
release. The display flashes AUTO and starts auto-scroll down the entire
column of pages.
To auto-scroll through TURBO pages

Press of continuously for three seconds and then release. The display
flashes AUTO and starts auto-scroll through the TURBO pages.

NOTE:
Press any key to revert to manual scrolling.
Auto scrolling is not possible in the setup parameters.

Default Display (View) Page

You can select any page as user-set default display page. You can scroll to
other display pages. The user-set page is displayed two minutes after the
manual scrolling is stopped by the user.
To lock the user-set default page:
Go to the page you want to set as default page.
Press and simultaneously to lock the page. The power meter
displays LOCK.
To unlock the user-set default page:
Once default display page is active, press and simultaneously to
unlock the key page. The power meter displays ULOC.

NOTE: Entry into setup (PROG) is allowed only when the display page is unlocked.

Default Display Page through Communication

You can lock and unlock the default display page through communication
(ConPAD).
If the default display page is locked by operator through communication,
the default display page can be unlocked through front panel.
If the default display page is locked by supervisor through communication,
the operator cannot unlock the default display page through front panel
and communication. Only supervisor can unlock through communication.

12 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 1 – EM6400 Series Power Meters Product Description

Rear Panel
The EM6400 series power meter terminals are located on the rear panel. 14
terminals are provided, seven terminals on each side:
Six terminals for current, one in and one out per phase.
Four terminals for voltage, for three phases and neutral.
Two terminals for auxiliary power supply (control power).
Two terminals for the RS 485 communication port.

Figure 1-2: Rear panel

Input current
terminals Input voltage terminals
A1, A2, A3 V1, V2, V3, VN

Auxiliary supply
(control power) terminals
RS 485 communication
terminals

© 2011 Schneider Electric. All rights reserved. 13

EM6400 Series Power Meters CTD7303
Chapter 1 – EM6400 Series Power Meters Product Description 01/2011

Models and Parameters with EM6400 Series Power

Meters
The power meter can measure, locally display and remotely transfer over
Modbus RTU, the following parameters:

Table 1-5: Models and parameters with EM6400 series power meters

EM EM EM EM EM
Parameter
6459 6433 6434 6436 6400
RMS VLLV12, V23, V31   
VLN V1, V2, V3
A A1 A2 A3    
An C C
Neutral current
F   
%L – Amps  
% V Unbal  
% A Unbal
PF PF1 PF2 PF3    

%A FS     
Analog color coded
load bar
RPM  
Aº Phase Angle  
Aº1 Aº2 Aº3
W W1 W2 W3    
VA VA1 VA2 VA3    
VAR VAR1 VAR2  
VAR3
DM Demand VA/ W/ A
Rising demand DM
Time remaining
Maximum Demand
(MD)
Hr MD occurred
INTG Wh    
FWD VAh    
VARh  
-VARh  
Run hours    
ON hours     
INTR     
INTG R.Wh
REV R.VAh I/E
R.VARh
-R.VARh
Run hours
OLD Wh    
FWD VAh    
VARh  
-VARh  
Run hours    
OLD R.Wh
REV I/E
R.VAh
R.VARh
-R.VARh
Run hours
RS 485 Built-in Built-in

14 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 1 – EM6400 Series Power Meters Product Description

NOTE:
 – Standard; – Option specified while ordering; C – Only through communication;  –
Selectable through setup.
FWD: Forward indicating the import of power into the plant/grid
REV: Reverse indicating the export of power from the plant/grid

The EM6400 series power meter displays:

Voltage: Three voltage measurements line-to-line: 1-2, 2-3, 3-1, and
average, Three voltage measurements line-to-neutral: 1-4, 2-4, 3-4, and
average.
Current: Three current measurements phase-wise (1, 2, 3), average
current of all three phases, neutral current, and three current phase angles
(A 1, A 2, A 3) with respect to the corresponding voltage line-neutral
vector.
Phase wise load in %: Three currents in % of the FS (%A FS).
Unbalanced load in %: Current and voltage unbalance.
Frequency: Measures from whichever phase is active.
RPM: Measures the speed of the generator.
Power: VA, W, VAR, per phase and total. PF per phase and average. Per-
Phase W readings provide a quick CT Polarity Check. A negated W phase
reading indicates CT reversal.
Energy: VAh, Wh, +VARh (Ind), -VARh (Cap), Run hours, On Hrs, supply
interruptions (outage).
Energy (OLD): VAh, Wh, +VARh (Ind), -VARh (Cap), Run hours.
% Amperes load bar graph: Load bar graph indicates consumption in
terms of % amperes total. You can quickly estimate the load by viewing
the display without operating any keys. The bar graph consists of 12
segments. Each segment indicates a current load of 10% of CT primary.
Kilo, Mega, Giga indication for the above parameters. See ―The
indicators‖ on page 9 for more information.

© 2011 Schneider Electric. All rights reserved. 15

EM6400 Series Power Meters CTD7303
Chapter 1 – EM6400 Series Power Meters Product Description 01/2011

EM6400 Series Power Meters Technical Specification

The EM6400 series power meters are high-accuracy, low cost, ultra-
compact, power, and energy meter series. It offers ISO 9001 quality,
accuracy and functional flexibility. Selective models of this series have
Modbus RTU communications capability. The standard unit flush-mounts in
a DIN 96 cutout and conforms to UL product standards.

The power meters are designed for retrofit applications such as replacement
of analog meters. Each can be used as standalone meter in electrical
control panels, power distribution unit (PDU), switch boards, uninterrupted
power supply (UPS), generator sets, and motor control center (MCC)
systems. It also provides easy communication to program logic control
(PLC), distributed control system (DCS), building management system
(BMS), and other systems. The following table gives the technical
specifications of the power meters. Refer to ―Technical data‖ on page 71 for
more information.

Table 1-6: Technical specifications

Description Specification
Sensing/Measurement True RMS, one second update time, four quadrant power
and energy
Accuracy* Class 1.0 as per IEC 62052-11 and IEC 62053-21
Optional: Class 0.5S, 0.2S as per IEC 62052-11, 62053-22
and ANSIC12.20
Auxiliary supply 44 to 300 VAC/DC
(Control power)
Burden Voltage and current input < 0.2 VA per phase
Auxiliary supply (Control power) < 3 VA at 240 V
Display Alphanumeric bright LED
Resolution RMS four digits, INTG eight digits
Input voltage Four voltage inputs (V1, V2, V3, VN) 110 or 415 VACLL
nominal (Range 80 to 600 VAC LL)
Input current Current inputs (A1, A2, A3)\
(Energy measurement) 5 A Class 1.0/0.5: 5 mA (starting) to 6 A*
5 A Class 0.5S/0.2S: 5 mA (starting) to 6 A
1 A Class 0.5S/0.2S: 1 mA (starting) to 1.2 A
Frequency 45 to 65 Hz
Overload 5 A: 10 A max continuous
1 A: 2 A max continuous
Environmental Operating temperature: -10 C to 60 C (14 F to 140 F)
Storage temperature: -25 C to +70 C (-13 F to 158 F)
Humidity 5% to 95% non condensing
Standard - Measurement category III,
Pollution Degree 2,
- Double insulation at user-accessible area
Weight 400 gms approx, unpacked
500 gms approx, shipping
Communication RS 485 serial channel connection Industry standard Modbus
(optional) RTU protocol
EM6400 series Emission : CISPR22; Fast Transient: 4kV IEC 61000-4-4;
conforms to Surge withstand: IEC 61000-4-5;
Damped Oscillatory: IEC 61000-4-12; ESD: IEC 61000-4- 2;
Impulse voltage: 6 kV, IEC 60060, 1.2/50 µs
Isolation 2k VAC isolation for one min between all isolated circuits
including communication port
Protection against dust Front – IP 51; Back – IP 40
and water
NOTE: * For 5 A universal power meter additional error of 0.05% of full scale, for power meter
input current below 100 mA.

16 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 2 – Safety Precautions

Chapter 2: Safety Precautions

This section contains important safety precautions that must be followed
before attempting to install, service, or maintain electrical equipment.
Carefully read and follow the safety precautions outlined below.

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Apply appropriate personal protective equipment (PPE) and follow safe electrical
work practices. In the USA, see NFPA 70E.
Only qualified electrical workers should install this equipment. Such work should be
performed only after reading this entire set of instructions.
If the equipment is not used in a manner specified by the manufacturer, the
protection provided by the equipment may be impaired.
NEVER work alone.
Before performing visual inspections, tests, or maintenance on this equipment,
disconnect all sources of electric power. Assume that all circuits are live until they
have been completely de-energized, tested, and tagged. Pay particular attention to
the design of the power system. Consider all sources of power, including the
possibility of back feeding.
Turn off all power supplying the power meter and the equipment in which it is
installed before working on it.
Always use a properly rated voltage sensing device to confirm that all power is off.
Before closing all covers and doors, inspect the work area for tools and objects that
may have been left inside the equipment.
When removing or installing panels do not allow them to extend into the energized
bus.
The successful operation of this equipment depends upon proper handling,
installation, and operation. Neglecting fundamental installation requirements may
lead to personal injury as well as damage to electrical equipment or other property.
NEVER bypass external fusing.
NEVER short the secondary of a PT.
NEVER open circuit a CT; use the shorting block to short circuit the leads of the CT
before removing the connection from the power meter.
Before performing Dielectric (Hi-Pot) or Megger testing on any equipment in which
the power meter is installed, disconnect all input and output wires to the power
meter. High voltage testing may damage electronic components contained in the
power meter.
The power meter should be installed in a suitable electrical enclosure.

Failure to follow these instructions will result in death or serious injury

© 2011 Schneider Electric. All rights reserved. 17

EM6400 Series Power Meters CTD7303
Chapter 2 – Safety Precautions 01/2011

18 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 3 – Quick Start Guide

Chapter 3: Quick Start Guide

PROG Menu — Setup

The power meter must be configured to match the application settings,
before use. Otherwise, the readings will be incorrect.
All the setup values can be re-programmed at any time, using SET.
However, the settings: SYS (WYE (Star)/Delta/single-phase / 2-Phase),
Vpri, Vsec, Apri, Asec critically determine the scaling of measured
readings.
The scaling may be used to reduce the errors in readings due to
Instrument Transformer errors. However, incorrect settings will introduce
errors in readings of other running systems.

HAZARD OF UNINTENDED OPERATION

Only qualified personnel are authorized to set up the power meter.

Failure to follow this instruction can result in injury or equipment

damage.

You can enter the PROG menu - setup in

View only mode: To view the set parameters.
Edit mode: To view or edit set parameters.

Quick Setup – While powering ON

This is the easiest way to enter the PROG menu setup.
To make connections, see ―Connection diagrams‖ on page 48. Here are
few tips.

Figure 3-1: Quick setup - connections

2
Use CT1 3
Use PT1
Use CT2
Use PT2
Use CT3 Use PT3

RS 485
communication Aux supply
1
4 (control power)
44 to 300 VAC/DC

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EM6400 Series Power Meters CTD7303
Chapter 3 – Quick Start Guide 01/2011

1. Connect auxiliary supply (control power) 44 to 300 VAC/DC to terminals 12

and 13 in order to power ON the power meter.
Keep pressed for two seconds, while powering up the power meter.
The power meter enters directly into PROG menu setup and displays
EDIT A.PRI 100.0.
Program the following setup parameters for accurate readings:
A.pri, A.sec: Set these values to match your CT primary and
secondary values. For example, if your CT Ratio is 200:5, set A.pri =
200.0 and A.sec = 5.000.
V.pri, V.sec:
Set these values to match the input voltage VLL of circuit, if the
input voltage < 600 VAC LL. For example, if input voltage = 300
VAC LL, set V.pri = 300.0 and V.sec = 300.0.
Use potential transformer (PT/VT), if the input voltage > 600 VAC
LL. Set the V.pri and V.sec values to match the primary and
secondary of the PT(VT) respectively. For example, if PT(VT) ratio
is 11 kV: 110, set V.pri = 11.00 k and V.sec = 110.0.
Select one of the following systems according to your wiring
configuration:
SYS: DLTA for 3-phase 3-wire system
SYS: WYE/Star for 3-phase 4-wire system
SYS: 2-phase for 2-phase 3-wire system
SYS: single-phase for single-phase 2-wire system
2. Connect the current transformers (CTs).

CT1 CT2 CT3

1, 2 3, 4 5, 6

3. Connect the voltage inputs. Use PT (VT), if voltage exceeds 600 VAC LL.

PT1 PT2 PT3 Neutral

8 9 10 11

4. RS 485 terminals

+ve -ve
7 14

20 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 3 – Quick Start Guide

Enter Setup Menu in View (Read-Only) Mode

1. From RMS, press . The display shows CLR.

2. Press . The display shows SET.
3. Press . The display shows VIEW.
4. Press . Use and to scroll and view the setup parameters and
their current settings.

Enter Setup Menu in Edit Mode

NOTE: means blinking

2 Means blinking 2

1. From RMS, press . The display shows CLR.

2. Press . The display shows SET.
3. Press . The display shows VIEW.
4. Press . The display shows EDIT. CODE entry is required to enter the
setup menu in edit mode.
5. Press for two seconds. The display shows CODE 2000 with 2 blinking
The factory set code is 1000.
6. Press . The display shows CODE 1000 with 1 blinking.
7. Press once or four times to accept the new CODE value.
The display shows PASS and then EDIT A.PRI 100.0 indicating the
successful entry to the setup menu in edit mode.

NOTE: If you enter an incorrect code, the display flashes FAIL, and then displays EDIT. Repeat
the procedure and make sure that you enter the correct code.

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EM6400 Series Power Meters CTD7303
Chapter 3 – Quick Start Guide 01/2011

Setup Parameters in View and Edit Modes

2

A.PRI = Current primary winding (CT)*; Input range 1 A to 99 kA.

Default value is 100.0

A.SEC = Current secondary winding (CT);

Default value is 5.000

V.PRI = Voltage primary winding (PT), line to line*; Input range 100 V to 999
kV; Default value is 415.0

V.SEC = Voltage secondary winding (PT), line to line*; Input range 80 V to

600 V; Default value is 415.0

SYS = System configuration; Select from StAR, dLtA, 2 ph, 1 ph; Default
value is StAR.

LAbL = Phase labeling; Select from 123, RYB, RST, PQR, ABC; Default value
is 123.

VA.Fn = VA function selection; Select between 3D, ARTH; Default value

is 3D.

d.SEL = Demand selection*; Select from AUTO, User; Default value is

AUTO.

NOTE:* Changing these values while device is in use is not recommended.

BAUD, PRTY, and ID are applicable only for EM6400 series power meters with RS 485
communication option.

22 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 3 – Quick Start Guide

Setup Parameters in View and Edit Modes

(continued)

d.PAR = Demand parameter selection*; Select from VA, W, A; Default value

is VA.

d.PRD = Demand period; Select from 5, 10, 15, 20, 25, 30; Default value is
15.

Baud = Baud rate; Select from 1200, 2400, 4800, 9600, 19200; Default value
is 9600.

PRTY = Parity and stop bit settings; Select from EVN.1, EVN.2, OD.1,
ODD.2, no.1, no.2; Default value is EVN.1.

ID = RS 485 device ID number; Select from 1.000 to 247.0; Default value is

1.000.

F.S% = Full scale percentage; Set the full scale between 1.000 to 100.0;
Default value is 100.0

OFLO = Overflow parameter selection; Select from Wh, VAh;

POLE = Number of poles for RPM; Select from 2.000, 4.000, 6.000, 8.000,
10.00, 12.00, 14.00, 16.00; Default value is 4.000.

2 NOTE: * Changing these values is not recommended, while the device

is in use.

NOTE:* Changing these values while device is in use is not recommended.

BAUD, PRTY, and ID are applicable only for EM6400 series power meters with RS 485
communication option.

© 2011 Schneider Electric. All rights reserved. 23

EM6400 Series Power Meters CTD7303
Chapter 3 – Quick Start Guide 01/2011

Edit Set Parameters in PROG Menu

This example explains how to edit the value of A.PRI from 100.0 to 5000 in
PROG menu setup of the EM6400 series power meter. Then it shows how
to save the value to the setup.

NOTE: After entering into setup, the power meter exits from the setup automatically, if there is no
key press for > 2 min.

Edit and Accept Setup

Press four
times

Press four times

NOTE: means blinking

2 Means blinking 2

1. After you have successfully entered setup menu in edit mode, (Refer to
―Enter setup menu in Edit mode‖ on page 21 for more information) press
. The display shows EDIT A.PRI 100.0 with blinking 1. This indicates
that the value can be edited.
2. Press for four times. The display shows EDIT A.PRI 5.000 with
blinking 5. The value can be edited.
3. Press four times. The display shows EDIT A.PRI 500.0 with blinking
―.‖.
4. Press . The display shows EDIT A.PRI 5000. with blinking ―.‖.
5. Press to accept the new value.
To edit the next parameter, press and repeat the above steps.

24 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 3 – Quick Start Guide

Save the New Value to Setup

NOTE: means blinking

y means blinking y

1. After you edit the parameter as described above, press . The display
shows SAVE y with blinking y.
2. Press or to save the new value. The display flashes PASS and
then shows EDIT.
3. Press to return to SET.

NOTE: If you do not want to save the new value, press to change the value from SAVE y to
SAVE n in step 1. Then press or . The display flashes FAIL and shows EDIT. Proceed
to step 3.

© 2011 Schneider Electric. All rights reserved. 25

EM6400 Series Power Meters CTD7303
Chapter 3 – Quick Start Guide 01/2011

Clear INTG and Maximum Demand (MD)

The power meters are equipped with energy integrator INTG, where the
energy parameters are accumulated
INTG CLR: Clear both INTG and MD values
INTG MD: Clear only MD values

NOTE: means blinking

y means blinking y

INTG Clear
1. From RMS, press . The display shows CLR.
CODE entry is required to clear the INTG values.
2. Press for two seconds. The display shows CODE 2000 with blinking
2. The factory set CODE is 1000.
3. Press . The display shows CODE 1000 with blinking 1.
4. Press once or four times to accept the new value.
After the successful CODE entry, the display shows CLR INTG.
5. In order to clear INTG, press . The display shows CLR INTG y with
blinking y.
6. Press to clear INTG. The display flashes PASS and then CLR
INTG.
7. Press . The display shows CLR.
8. Press to return to RMS page.

NOTE: If you do not want to clear the integrators, press to change the value from CLR
INTG y to CLR INTG n in step 5. Then press . The display flashes FAIL and then show
CLR INTG. Proceed to step 7.

26 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 3 – Quick Start Guide

MD Clear
1. From RMS, press . The display shows CLR.
CODE entry is required to clear the INTG values.
2. Press for two seconds. The display shows CODE 2000 with blinking
2. The factory set CODE is 1000.
3. Press . The display shows CODE 1000 with blinking 1.
4. Press once or four times to accept the new value.
After the successful CODE entry, the display shows CLR INTG.
5. Press . The display shows CLR MD
6. Press . The display shows CLR MD y with blinking y.
7. Press to clear MD. The display flashes PASS and then CLR MD.
8. Press . The display shows CLR.
9. Press to return to RMS page.

NOTE: If you do not want to clear the MD, press to change the value from CLR MD y to
CLR MD n in step 6. Then press . The display flashes FAIL and then show CLR MD.
Proceed to step 8.

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EM6400 Series Power Meters CTD7303
Chapter 3 – Quick Start Guide 01/2011

Energy Integrator
The EM6400 series power meter is equipped with an energy integrator
function. It provides several parameters for Energy Management: VAh, Wh,
VARh (Ind), -VARh (Cap), run.h (run hours), on.h (on hours), INTR
(Interruptions/outages).

A few of these need explanation:

RUN.h: Indicates the period the load has been ON and has run. This
counter accumulates as long as the load is ON.
On.h: The period for which the power meter (supply) is ON.
INTR: Number of supply outages, means the number of auxiliary supply
interruptions. If the power meter auxiliary supply is from a UPS then the
INTR (number of interruptions) will be zero (as long as the UPS stays ON),
even if the voltage signals die out from time to time.

NOTE:
CT Reversal: Auto-correction for energy integration in star (wye) mode. In star (wye) mode
energy integration always be in forward direction irrespective of the direction of current flow or
sign of the power reading per phase (not applicable IE models).

Integrator Overflow
The EM6400 series power meter contains a comprehensive integrator to
support energy management. It accumulates several parameters over time,
as explained above. All values are direct readings and have a high
resolution. This is necessary for accurate energy analysis over short
intervals of time. It also means that the readings max out and reset sooner
or later, as given below. Since the Integrator contains counters for several
parameters (VAh, Wh, VARh, -VARh, Run Hours, On Hours, Interruptions),
they all reset together when any one of them overflows (usually Wh – but
can be changed to VAh through the Setup). This makes energy
management calculations such as average PF very easy.

The maximum number that the power meter handles is 9,999 Giga for RMS
and energy values. The value at which the power meter overflows is given
below.

The overflow value depends on the product of the primary voltage and
current rating.

Table 3-1: Integrator overflow

V.PRI x A.PRI x Max reading Max time to Max time to
1.732 (Wh/VAh) reset the overflow in
integrator in months at full
Run Hours scale
1 VA to 1000 VA 9999 k 9999 13.88
1 kVA to 1000 kVA 9999 M 9999 13.88
1 MVA to 1000 MVA 9999 G 9999 13.88

> 1000 MVA <9999 <1 year

OLD Data Register

The power meters have an OLD data register, where the cleared INTG
values are stored.
The energy values in the integrator are transferred to the OLD register
when the INTG is cleared (manually/due to overflow). Thus the OLD
energy values are not lost even after the integrator is cleared and can be
viewed with the OLD parameter. Remember that the OLD values will be

28 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 3 – Quick Start Guide

overwritten, when the INTG is cleared next time.

The values of parameters Wh, VAh, VARh, -VARh, and Run.h are stored
in the OLD register when the INTG is cleared.

Demand Power Calculation Methods

Demand power is the energy accumulated during a specified period divided
by the length of that period. How the power meter performs this calculation
depending on the method you select. To be compatible with electric utility
billing practices, the power meter provides the following types of demand
power calculations:
Auto (sliding block)
User (fixed block)

Auto (sliding block)

In the auto demand power calculation, you select an interval between five
and 30 minutes in steps of five minutes. The demand calculation updates
every 15 seconds.

Auto demand power calculation is the default calculation for EM6400 series
power meters.

User (fixed block)

In the user demand power calculation, you select an interval between five
and 30 minutes in steps of five minutes. The demand calculation updates at
the end of the interval. User demand power calculation can be selected
through setup. See ―Setup parameters in View and Edit modes‖ on page 22
for more information.

15 minute interval Demand value is the

average for the last
completed interval
Calculation updates
every 15 seconds

Time
15 30 45 60 (second)

Auto (Sliding block) demand calculation

Demand value is the

average for the last
completed interval

15 minute interval 15 minute interval

Time
15 (Second)
User (Fixed block) demand calculation

© 2011 Schneider Electric. All rights reserved. 29

EM6400 Series Power Meters CTD7303
Chapter 3 – Quick Start Guide 01/2011

EM6400 Series Power Meters Menu Hierarchy

EM6459 Meter Menu Hierarchy

RMS = RMS value display pages are in sub level

V 12
RMS 23 VLL = Phase-Phase voltage average
31 A = Current average
VLL PF = Power Factor average
A
PF V 1 VLN = Phase-Neutral voltage average
2 A = Current average
3 F = Frequency in Hz

V12 = RMS voltage, phase 12

A 1 V23 = RMS voltage, phase 23
2 V31 = RMS voltage, phase 31
3
V1 = RMS voltage phase 1 to neutral
V2 = RMS voltage phase 2 to neutral
V3 = RMS voltage phase 3 to neutral
L%1
2
A1 = RMS current, phase 1
3
A2 = RMS current, phase 2
A3 = RMS current, phase 3
VLN
A Aº 1 L1% = % of load, phase 1
2 L2% = % of load, phase 2
F
3 L3% = % of load, phase 3

A°1 = Current phase angle, phase 1 in degrees

A°2 = Current phase angle, phase 2 in degrees
A.UNB A°3 = Current phase angle, phase 3 in degrees
V.UNB
RPM

PF 1
2
3 PF1 = Power factor, phase 1
PF2 = Power factor, phase 2
PF3 = Power factor, phase 3

An = Neutral current

INTG On.h
INTG Fwd = Forward Integrator
Fwd

INTR
On.h = Duration of supply ON

DIAG Dia1 INTR = No of power interruptions

DIAG = represents diagnostic pages. The values

Dia2
contained in these pages are for factory testing only

Dia1 = Communication settings

Dia3

Dia2 = Product model and version number

SET VIEW
Dia3 = Display scanning for display LED check
EDIT
SET = Has two modes: EDIT/VIEW set parameters

CLR VIEW = To view simultaneous setup parameter

name and value display
EDIT = To edit simultaneous setup parameter
name and value display
CLR = Clears INTG values

30 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 3 – Quick Start Guide

EM6433 Power Meter Menu Hierarchy

RMS = RMS value display pages are in sub level

A = Current average
A 1 W = Watt total
RMS
2
3 A1 = RMS current, phase 1
A A2 = RMS current, phase 2
W A3 = RMS current, phase 3
W1
2
3

INTG Wh
Fwd

Run.h Wh = Forward Watt hours. Wh integrates always in the

forward direction irrespective of the direction of flow of
current for star (Wye) mode

On.h Run.h = Forward run hours, Total hours the load was
ON
On,h = Duration of supply ON
INTR
INTR = No of power interruptions

OLD Fwd = The energy values stored in the integrator will

OLD Wh be transferred to the OLD register when the integrator is
Fwd cleared (manually or due to overflow)

Run.h Wh = OLD Forward Watt hours.

Run.h = OLD Forward run hours

DIAG Dia1

Dia2

Dia3

SET VIEW

EDIT

CLR

© 2011 Schneider Electric. All rights reserved. 31

EM6400 Series Power Meters CTD7303
Chapter 3 – Quick Start Guide 01/2011

EM6436 Power Meter Menu Hierarchy

RMS = RMS value display pages are in sub level

VLL = Phase-Phase voltage average

V 12 A = Current average
VLL 23 PF = Power Factor average
RMS A 31
PF
VLN = Phase-Neutral voltage average
A = Current average
F = Frequency in Hz
VLN V 1
A 2
F 3

V12 = RMS voltage, phase 12

A A 1 V23 = RMS voltage, phase 23
W 2 V31 = RMS voltage, phase 31
PF 3
V1 = RMS voltage phase 1 to neutral
V2 = RMS voltage phase 2 to neutral
W1 V3 = RMS voltage phase 3 to neutral
2
3
A1 = RMS current, phase 1
A2 = RMS current, phase 2
PF 1 A3 = RMS current, phase 3
2
3

INTG Wh
Fwd

Run.h

On.h Wh = Forward Watt hours. Wh integrates always in the

forward direction irrespective of the direction of flow of
current for star (Wye) mode
INTR Run.h = Forward run hours, Total hours the load was
ON
On,h = Duration of supply ON
OLD Wh
Fwd INTR = No of power interruptions

Run.h OLD Fwd = The energy values stored in the integrator will
be transferred to the OLD register when the integrator is
cleared (manually or due to overflow)

Wh = OLD Forward Watt hours.

DIAG Dia1

Run.h = OLD Forward run hours

Dia2

Dia3

SET VIEW

EDIT

CLR

32 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 3 – Quick Start Guide

EM6434 Power Meter Menu Hierarchy

1
RMS = RMS value display pages are in sub level
VA VA 1
RMS W 2 VA = Apparent power total
PF 3 W = Active power total
PF = Power factor average
W1
VA 2 VA = Apparent power total
W 3 W = Active power total
VAR VAR = Reactive power total
VAR1
2 W = Active power total
3 VAR = Reactive power total
W
VAR PF = Power factor average
PF PF 2
1
3 VA1 = Volt-amperes, phase 1
VA2 = Volt-amperes, phase 2
VA3 = Volt-amperes, phase 3

INTG VAh W1 = Watts, phase 1

W2 = Watts, phase 2
Fwd W3 = Watts, phase 3
Wh VAR1 = VAR, phase 1
VAR2 = VAR, phase 2
VAR3 = VAR, phase 3
VARh PF1 = Power factor, phase 1
PF2 = Power factor, phase 2
PF3 = Power factor, phase 3
-VARh
INTG Fwd = Forward Integrator
Run.h
VAh = Fwd Volt-ampere hours

OLD VAh Wh = Fwd Watt hours

Fwd
VARh = Fwd Reactive energy, inductive
Wh
-VARh = Fwd Reactive energy, capacitive

VARh Run.h = Fwd Run hours

OLD Fwd = OLD Forward Integrator

-VARh

VAh = OLD Fwd Volt-ampere hours

Run.h
Wh = OLD Fwd Watt hours

DIAG Dia1 VARh = OLD Fwd Reactive energy, inductive

Dia2 -VARh = OLD Fwd Reactive energy, capacitive

Run.h = OLD Fwd Run hours

Dia3
DIAG = represents diagnostic pages. The values
contained in these pages are for factory testing only

SET VIEW Dia1 = Communication settings

Dia2 = Product model and version number

EDIT
Dia3 = Display scanning for display LED check

CLR SET = Has two modes: EDIT/VIEW set parameters

VIEW = To view simultaneous setup parameter

name and value display
1 EDIT = To edit simultaneous setup parameter
name and value display

CLR = Clears INTG values

© 2011 Schneider Electric. All rights reserved. 33

EM6400 Series Power Meters CTD7303
Chapter 3 – Quick Start Guide 01/2011

EM6400 Power Meter Menu Hierarchy

4 3

RMS = RMS value display pages are in sub level

V 12
RMS 23 VLL = Phase-Phase voltage average
31 A = Current average
VLL PF = Power Factor average
A
PF V 1 VLN = Phase-Neutral voltage average
2 A = Current average
3 F = Frequency in Hz

A 1 VA = Apparent power total

2 W = Active power total
3 PF = Power factor average

V12 = RMS voltage, phase 12

L%1 V23 = RMS voltage, phase 23
2 V31 = RMS voltage, phase 31
3
V1 = RMS voltage phase 1 to neutral
V2 = RMS voltage phase 2 to neutral
VLN V3 = RMS voltage phase 3 to neutral
A Aº 1
F 2 A1 = RMS current, phase 1
3 A2 = RMS current, phase 2
A3 = RMS current, phase 3

A.UNB L1% = % of load, phase 1

V.UNB L2% = % of load, phase 2
RPM L3% = % of load, phase 3
A°1 = Current phase angle, phase 1 in degrees
A°2 = Current phase angle, phase 2 in degrees
A°3 = Current phase angle, phase 3 in degrees
VA VA 1
W A.UNB = Current unbalance
2 V.UNB = Voltage unbalance
PF 3 RPM = RPM of the motor
W1
VA 2 VA1 = Volt-amperes, phase 1
W 3 VA2 = Volt-amperes, phase 2
VAR VA3 = Volt-amperes, phase 3
VAR1 W1 = Watts, phase 1
2 W2 = Watts, phase 2
3 W3 = Watts, phase 3
W
VAR
PF PF 2
1 VAR1 = VAR, phase 1
VAR2 = VAR, phase 2
3 VAR3 = VAR, phase 3
PF1 = Power factor, phase 1
THD V00 1 PF2 = Power factor, phase 2
2 PF3 = Power factor, phase 3
3 THD = Total Harmonic Distortion
A00 1 V00 1 = Voltage THD, Phase 1
2 V00 2 = Voltage THD, Phase 2
3 V00 3 = Voltage THD, Phase 3
A00 1 = Current THD, Phase 1
DM A00 2 = Current THD, Phase 2
VA VAd A00 3 = Current THD, Phase 3
Rd DM VA = VA Demand
TR

VAd = VA demand
MD Rd = Rising demand
HR
TR = Time remaining
MD = Maximum demand
HR = On hours at which maximum demand has
occurred

NOTE: THD values are indicative only

34 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
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EM6400 Power Meter Menu Hierarchy (Continued)

INTG VAh INTG Fwd = Forward Integrator

Fwd
VAh = Fwd Volt-ampere hours
Wh

Wh = Fwd Watt hours

VARh
VARh = Fwd Reactive energy, inductive

-VARh
-VARh = Fwd Reactive energy, capacitive

Run.h Run.h = Fwd Run hours

INTG Rev = Reverse Integrator

INTG R.VAh
Rev
R.VAh = Reverse Volt-ampere hours
R.Wh

R.Wh = Reverse Watt hours

R.VAR

R.VAR = Reverse Reactive energy, inductive

-R.VAR
-R.VAR = Reverse Reactive energy, capacitive
R.Run
R.Run = Reverse Run hours

INTG t.VAh INTG TOT = Total Integrator

TOT
t.Wh t.VAh = Total Volt-ampere hours

t.VAR t.Wh = Total Watt hours

-t.VAR t.VAR = Total Reactive energy, inductive

t.Run -t.VAR = Total Reactive energy, capacitive

t.Run = Total Run hours

On.h
On.h = Duration of supply ON
INTR
INTR = Number of power interruptions

© 2011 Schneider Electric. All rights reserved. 35

EM6400 Series Power Meters CTD7303
Chapter 3 – Quick Start Guide 01/2011

EM6400 Power Meter Menu Hierarchy (Continued)

OLD Fwd = OLD Forward Integrator

OLD VAh
Fwd
VAh = OLD Fwd Volt-ampere hours
Wh

Wh = OLD Fwd Watt hours

VARh
VARh = OLD Fwd Reactive energy, inductive
-VARh
-VARh = OLD Fwd Reactive energy, capacitive

Run.h Run.h = OLD Fwd Run hours

OLD Rev = OLD Reverse Integrator

OLD R.VAh
Rev
R.VAh = OLD Reverse Volt-ampere hours
R.Wh

R.Wh = OLD Reverse Watt hours

R.VAR

R.VAR = OLD Reverse Reactive energy, inductive

-R.VAR
-R.VAR = OLD Reverse Reactive energy, capacitive
R.Run
R.Run = OLD Reverse Run hours

OLD t.VAh OLD TOT = OLD Total Integrator

TOT
t.Wh t.VAh = OLD Total Volt-ampere hours

t.VAR t.Wh = OLD Total Watt hours

3
-t.VAR t.VAR = OLD Total Reactive energy, inductive

t.Run -t.VAR = OLD Total Reactive energy, capacitive

t.Run = OLD Total Run hours

DIAG Dia1
DIAG = represents diagnostic pages. The values
contained in these pages are for factory testing only
Dia2
Dia1 = Communication settings
Dia3
Dia2 = Product model and version number

SET VIEW Dia3 = Display scanning for display LED check

SET = Has two modes: EDIT/VIEW set parameters

EDIT

VIEW = To view simultaneous setup parameter

CLR name and value display
EDIT = To edit simultaneous setup parameter
name and value display

CLR = Clears INTG and MD values

36 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 4 – AC Power Measurement

Chapter 4: AC Power Measurement

3-Phase Systems
A 3-phase system delivers higher levels of power for industrial and
commercial applications. The three phases correspond to three potential
lines. A 120° phase shift exists between the three potential lines.
A typical configuration has either a Delta connection or a Wye (Star)
connection

In a 3-phase system, the voltage levels between the phases and the neutral
are ideally defined by V1 = V2 = V3 = V12 / √3 = V23 / √3 = V31 / √3. In
practice, there will be some unbalance (difference).

Voltages between the phases vary, depending on loading factors and the
quality of distribution transformers.

Power measurement in a poly-phase system is governed by Blondel's

Theorem. Blondel‘s Theorem states that, in a power distribution network,
which has N conductors, the number of measurement elements required to
determine power is N-1. A typical configuration of a poly-phase system has
either a Delta connection or a Wye (Star) connection (see Figure below).

Where EAB= Voltage across points A and B

ECB= Voltage across points C and B
EAN= Voltage across points A and N (Neutral)
EBN= Voltage across points B and N (Neutral)
ECN= Voltage across points C and N (Neutral)
IA = Current through conductor A
IB = Current through conductor B
IC = Current through conductor C

© 2011 Schneider Electric. All rights reserved. 37

EM6400 Series Power Meters CTD7303
Chapter 4 – AC Power Measurement 01/2011

Consumption and Poor Power Factor

CONSUMPTION: W h = W x T, where W = instantaneous power, T = time in
hours.

The total electric energy usage over a time period is the consumption of Wh.
Typically, the unit in which consumption is specified is the kilowatt-hour
(kWh): one thousand watts consumed over one hour. Utilities use the Wh
equation to determine the overall consumption in a billing period.

Poor power factor: Results in reactive power consumption. Transferring

reactive power over a distribution network causes energy loss. To force
consumers to correct their power factor, utilities monitor reactive power
consumption and penalize the user for poor power factor.

―3D‖ kVA Measurement

The power meters are equipped with 3D Measurement of kVA. This
advanced method provides the most accurate and predictable measurement
under unbalanced as well as distorted waveform conditions.

However, in case the power meters need to match the reading of older or
simpler power meters, which use the Arithmetic kVA definition, this too is
available as a Setup option.

Table 4-1: ―3D‖ kVA Measurement

kVA Other
Formula Which one?
Function Names
3D Factory U, Best, all around
setting
kVA3 D W2 VAR2 D2 Apparent,
Where D = Distortion Power per IEEE 100 Vector kVA

Arth kVAArth kVA1 kVA2 kVA3 Arithmetic, Good under

Scalar kVA Low unbalance,
to match
simpler meters
without 3D
capability

38 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 5 – Installation

Chapter 5: Installation

Mechanical Installation
The EM6400 series power meters are panel-mounted and have reliable,
rear-mounted terminal strips rated at 600 V.
The 92 x 92 mm (3.62 x 3.62 in.) cut-out and 96 x 96 mm (3.78 x 3.78 in.)
bezel dimensions adhere to IEC 61554 and DIN 43700.

The diagram below displays the various dimensions of mechanical

installations.

Figure 5-1: Mechanical dimensions, and recommended panel cut-out

83.0 8.0
3.26 0.31

90.0
3.54

96.0
3.78

© 2011 Schneider Electric. All rights reserved. 39

EM6400 Series Power Meters CTD7303
Chapter 5 – Installation 01/2011

Installation Procedure
Usage
First, decide how the power meter is to be used. If you do not already have an
energy management program in operation, then your energy consultant
should be able to help you identify which load(s) offer maximum savings
potential. This will help you decide which point is to be monitored, from where
the readings will be viewed from, who must have access to the instrument and
how often. Otherwise, decide the location of the power meter and install it. For
best performance, choose a location that provides all the required signals with
minimum wiring lengths.

Panel Considerations and Environment

The power meter is high-precision measuring instrument, and its operating
environment is of utmost importance. For maximum performance, the
instrument should be mounted in a dry, dust-free location, away from heat
sources and strong electromagnetic fields. To operate reliably, the following
conditions must be met:

Table 5-1: Environmental Conditions

Description Specification
Storage temperature -25 C to 70 C, (-13 F to 158 F)
Operating temperature -10 C to 60 C, (14 F to 140 F)
Relative humidity 5% to 95%, non-condensing

The power meters should be separated from other equipment, and sufficient
space must be provided all around for cooling air to rise vertically past the
instrument. The cooling air temperature must be below the specified
operating temperature.

The panel or housing, in which the EM6400 power meter is mounted, should
protect it from dust, moisture, oil, corrosive vapors, etc.

The panel doors must be easily opened to provide easy access to the power
meter wiring for troubleshooting. Allow clearance if the unit is going to swing
out, as well as adequate slack in the wiring. Allow space for terminal blocks,
CT shorting blocks, fuses, auxiliary contactors, and other necessary
components.

Viewing
For ease of operation, the location should be preferably at, or slightly above,
eye-level. For viewing comfort, minimize glare and reflections from strong
light sources.

40 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 5 – Installation

Mounting
The power meters are panel mountable.

Table 5-2: Mounting

Description Specification
Panel cut-out 92+0.5-0 mm (w) x 92+0.5-0 mm(h) IEC 61554 and
DIN 43700
Panel thickness 0.5 to 4.0 mm
Instrumental bezel dimension 96 x 96 mm
Depth behind bezel 83 mm
Mounting clamps screws Slotted, two numbers
Terminal screws Combination Phillips and slotted head

The cut-out should be punched with the proper tool and should be free from
burrs. The following figure explains the mounting of the power meter.

Figure 5-2: Mounting

90 90

1
Remove the
mounting clamps
from the power
meter. 2
Gently slide the power meter
through the cut-out.

3
Put the mounting clamps back in the power meter
and tighten the mounting clamps screws.

While supporting the power meter from the front, tighten both side clamp
screws in a criss-cross pattern till all slack is taken up and then apply one
full turn. Do not over-tighten. Over-tightening could result in breaking of the
clamps.

© 2011 Schneider Electric. All rights reserved. 41

EM6400 Series Power Meters CTD7303
Chapter 5 – Installation 01/2011

The power meter should be separated from other equipments and sufficient
space must be provided all around the power meter, to allow air to rise
vertically around the power meter. Lack of sufficient air for cooling may
result in over heating of the power meter.

NOTE: It is much easier to set up the meter before you mount the power meter on the panel.
See “Quick setup” on page 19 for more information.

Electrical Installation
This section describes the following:
The need for, and selection of, potential transformers (PTs) and current
transformers (CTs).
Auxiliary supply (control power), PT (VT), and CT connections.

For best results, ensure the following specifications:

Torque driver preferred, hand screwdriver OK.
TIP: Phillips head is preferred, but flat head is acceptable. Do not use
Pozidriv tips.

Screw head diameter = 3.5 mm (0.14 in.), TIP shaft diameter < 5 mm (0.2
in.).
IMPORTANT – Screwdriver shafts inserted angularly or of diameter ≥ 5 mm
(0.2 in.) will get stuck in the cover.
Tightening Torque: 0.25 to 1 N.m (2.21 to 8.85 lb-in)
Torque > 1 N.m (8.85 lb-in) may strip the screw or break the cover.
Loosening Torque: 1.2 N.m (10.62 lb-in)
Screw Travel: 6 mm (0.24 in.) less wire thickness

Connecting cable

Table 5-3: Connecting cable

Insulation Rating Current Rating

Voltage Circuit > 600 VAC > 0.1 A
Current Circuit > 600 VAC > 7.5 A
Or 2.5 mm2/ 14 AWG
minimum

NOTE: Installations should include a disconnecting device, like a switch or circuit breaker, with
clear ON/OFF markings to turn-off the auxiliary supply (control power). The disconnecting device
should be placed within the reach of the equipment and the operator.

42 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 5 – Installation

Terminal connections using lugs

Terminal connection using U lugs

Lug type: Insulated sleeved U lugs
2
Cross-section: 2.5 mm /14 AWG

It is very simple and easy to connect the terminals using the U lugs. The
following steps explain how to connect the power meter terminals using U
lugs.
1 2 3

1. Loosen the terminal screw.

2. Connect the wire with the U lug to the power meter terminal.
3. Tighten the terminal screw.

Terminal connections using ring lugs

Lug type: Ring lugs
2
Cross-section: 2.5 mm /14 AWG

To connect the terminals using ring lugs, follow the steps explained below.
1 2 3

4 5

1. Remove the protective cover from the power meter.

2. Remove the terminal screw from the power meter.
3. Connect the wire with the ring lug to the power meter terminal.
4. Place the terminal screw back in the terminal and tighten the terminal
screw.
5. Place the protective cover back and tighten the protective cover.

NOTE: The above example explains connection for only one terminal. In order to connect the
other terminals, repeat the steps 2 and 3 for as many numbers of terminals. Then proceed to
the remaining steps.

© 2011 Schneider Electric. All rights reserved. 43

EM6400 Series Power Meters CTD7303
Chapter 5 – Installation 01/2011

Auxiliary Supply (Control Power)

The EM6400 power meter requires a single-phase AC/DC auxiliary (control)
power supply to powerup its internal electronic circuitry. External surge
suppressors are necessary in the auxiliary supply circuit for proper operation
during extreme surge conditions, where the voltage surges exceed the
auxiliary supply limits (for example, rural areas and outlying areas prone to
lightning strikes).
Range:
44 to 300 VAC/DC.
Burden (load) < 3 VA at 240 V.
The control power may be derived from the voltage signals.
If you have a 440 V 3-wire delta system and a reliable neutral is not
available, use a 440 V: 240 V supply transformer to provide the standard
240 V auxiliary supply.

NOTE: It is much easier to set up the meter before you mount the meter on the panel. See
“Quick setup” on page 19 for more information.

PTs (VTs) and CTs

Large electrical installations have high voltages and currents, which may
exceed the direct connection rating of the power meter. In this case,
potential transformers (PTs) and current transformers (CTs) are used to
precisely step down or reduce the voltage and current levels to suit the
power meter rating. Potential transformers usually have a full scale output of
110 VAC RMS line-line and current transformers usually have a full scale
output of 5 A or sometimes 1 A.

The PTs (VTs) and CTs must be planned, installed, and tested by a qualified
electrical contractor before wiring the power meter. The accuracy of the
measurement also depends on the accuracy and phase angle error of the
PTs (VTs) and CTs. Instrument class 1 or better PTs and CTs are
recommended. Do not use protection class (10P10, etc.) CTs to feed the
power meters; they have poor accuracy and phase characteristics.
Ensure that the CT Primary rating has been selected so that your normal load
variation lies between 40% and 80% of its full scale. If your CT is over-rated,
e.g., if the load is always less than 10% of the CT primary rating, then the
accuracy suffers. On the other hand, if the CT is under-rated, then you may
exceed its full-scale. As a result, both the CT and the power meter will burn
out.

PT (VT), CT Wiring
The PTs (VTs) and CTs must have adequate VA rating to support the
burden (loading) on the secondaries. You may want to support the auxiliary
supply burden from one of the PTs (VTs). CT wiring can impose additional
burden (loading) on the CT. For example, if the CT has a 5 A secondary and
the wire resistance is 1.0 Ω, then the CT has to support an additional burden
of 5 VA. If the wiring distance from the CT secondary is greater than stated
in Table 5-5 on page 41, then the CT could get over-burdened and give
large errors. Choosing a 1 A CT secondary can reduce this error. The CT
secondary value must be user programmed into the power meter.

The power meters should be conveniently located for easy connections of

voltage (PT), current (CT) signals, and auxiliary (control) supply.

NOTE: The power meters user programmable PT and CT primary or secondary settings, may
be utilized to Calibrate out the PT and CT amplitude error, for improved accuracy.

44 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 5 – Installation

Voltage Signal Connections

For proper power meter operation, the voltage connection must be
maintained. The voltage must correspond to the correct terminal. The cable
required to terminate the voltage sense circuit should have an insulation
rating greater than 600 VAC and a current rating greater than 0.1 A.
There are four input voltage terminals marked V1, V2, V3, and Vn. See the
connection diagrams that follow, for details. For Delta connection, the Vn
terminal should be left unconnected.

PT Connections
The power meters directly accept LV voltage inputs of up to 600 VAC RMS
line to line (347 VLN). Voltages greater than this, typically HV systems,
must be connected through Potential transformers (PTs). The power meters
allow user programming of both PT primary and secondary voltages.
User programmable PT primary range: 0.1 to 999 kVAC RMS LL
User programmable PT secondary range: 80 to 601 VAC RMS LL
Power meter voltage Input burden: < 0.2 VA per input

NOTE: The PT primary and secondary values must be user programmed before using the
power meter. Otherwise, the readings will be incorrect.

Selecting the voltage fuses

We strongly recommend using fuses on each of the sense voltages (except
for neutral) and the control / auxiliary power.

Table 5-4: Fuse recommendation

Power Source Source voltage Fuse (A)

Line voltage 80 to 600 VLL 0.25

Auxiliary supply (Control 0.25

power)

Current Signal Connections

The power meter accepts up to 6 A AC RMS per channel directly. Above
that, a current transformer must be interposed to scale down the current.
There are three pairs of current input terminals marked A1, A2, and A3.
Each pair of input terminals is labeled as S1, S2 and has an arrow indicating
the direction of current flow. For proper measurements, the phase
identification, and the polarity of the current signals must be correct. The
forward flow (import by consumer) current direction must be into the S1
terminal and the exit from the S2 terminal. Maintain the correct sequence
and polarity to avoid incorrect readings.

Any unused current input terminals must be shorted together, e.g., in Delta
connection, the terminals A2 (S1, S2) must be shorted together. The shorted
terminals do not need to be grounded.

Install the wiring for the current circuit at 600 VAC insulation as a minimum.
The cable connection should be rated for 7.5 A or greater and have a cross-
2
sectional area of 2.5 mm (14 AWG) minimum.

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EM6400 Series Power Meters CTD7303
Chapter 5 – Installation 01/2011

CT Connections
Mount the current transformers (CTs) as close as possible to the power
meter for best accuracy. The following table illustrates the maximum
recommended distances for various CT sizes, assuming the connection is
2
via 2.5 mm (14 AWG) cable.

Table: 5-5: CT size and maximum distance

Maximum Distance in metres (in feet/inch)

5 A CT size
(CT to EM6400 power meter)
2.5 VA 3.05 m (10 ft/120 in.)
5.0 VA 4.6 m (15 ft/181 in,)
7.5 VA 9.15 m (30 ft/360 in.)
10.0 VA 12.2 m (40 ft/480 in.)
15.0 VA 18.3 m (60 ft/720 in.)
30.0 VA 36.6 m (120 ft/1441 in.)
User programmable CT primary range: 1 A to 99 kA AC.
CT secondary: 1 A or 5 A AC (programmable)
Other values are also programmable to compensate CT errors if desired.
Power meters CT burden: 0.2 VA maximum per input.

See the ―PROG menu — Setup‖ on page 19 for more information.

NOTE:
The PT primary and secondary values must be user programmed before using the power
meter. Otherwise, the readings will be incorrect.
With dual- range CTs; select the best range for programming the power meter. If you change
the range thereafter without re-programming the power meter, the power meter will read
erroneous values.

CT Polarity
When the power meter is connected using the CTs, you must maintain
correct CT polarities. CT polarities are dependent upon correct connections
of CT leads, and upon the direction the CTs are facing when clamped
around conductors. The dot on the CT must face the line side; the
corresponding secondary connection must connect to the appropriate input
on the power meter.

Failure to connect CTs properly results in inaccurate power readings. If your

power meter is not reading power properly, it is more than likely that the CT
is incorrectly wired. If one or two CTs are reversed, then energy parameters
accumulate only one phase value. If two or all the phases of the CT are
reversed, energy will not accumulate. (Energy import will not be measured).

CT Connection Reversal
To check the polarity of the CT after the power meter has been installed,
simply look at the phase-wise W (Watt) readings to see that each of the
readings are positive (assuming you are consuming power). If one of the W
readings is negative, that particular phase CT is reversed and must be
corrected. On the other hand if you are exporting power, all three phase-
wise W readings must be negative.

46 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 5 – Installation

Setup — System Type

The power meter needs to know the type of system to which it is connected
to. This information is programmed in the setup procedure, before using the
power meter. The power meter does allow you to change this setting while it
is running; however, this capability is meant for correcting a gross error, or
for training or educational purposes; it is not to be changed on regular basis.
The options are:

Wye/Star: For 3-phase 4-wire, three Watt-meter or three Element

circuits. Here, all three voltage phase signals, the neutral voltage
connection, and all three current input signals need to be wired in. This
means all the four voltage terminals, and six current terminals described in
the following section, need to be wired. For wye/star wiring configuration,
see ―3-phase 4-wire WYE connection with 3 CTs and 3 PTs‖ on page 48
for more information.
Delta: For 3-phase 3-wire, two Watt-meter or two Element circuits. For
delta and open delta wiring configuration, see ―3-phase 3-wire Delta
connection with 2 CTs and 3 PTs‖ and ―3-Phase 3-Wire Open Delta
connection with 2 CTs and 2 PTs‖ on page 49 for more information.
2-phase: For 2-phase 3-wire, two Watt-meter or two Element circuits.
Here, the two voltage phase signals, the neutral voltage connection, and
two current input signals need to be wired in. This means that the three
voltage terminals and four current terminals described in the following
section, need to be wired. For two phase wiring configuration, see ―2-phase
3-wire connection with 2 CTs‖ on page 50 for more information.
Single-phase: For single-phase 2-wire, one Watt-meter or one Element
circuits. Here a single voltage Phase signal, the neutral voltage
connection, and a single current input signal need to be wired in. This
means that two voltage terminals and one current terminal described in the
following section need to be wired. For Single phase wiring configuration,
see ―Single phase connection with 1 CT‖ on page 50 for more information.

© 2011 Schneider Electric. All rights reserved. 47

EM6400 Series Power Meters CTD7303
Chapter 5 – Installation 01/2011

Phase Labels
The phase labels shown on the display are programmable via the power
meters front panel PROG menu. You can setup the meter to display phase
labels convenient to your practice. The choices available are: 123 (factory
set), RYB, RST, PQR, ABC.

Connection Diagrams
Choose the diagram below that best describes your application. You must
ensure that the CT phase and corresponding PT phase are identical and
that the CT polarity is correct. Follow the outlined procedure to verify correct
connection.

Connection Diagram Symbols

Table 5-6: Connection diagrams symbols

Symbol Description
Fuse

Current transformer

3-phase 4-wire WYE connection

Direct voltage connection for the input voltages L-L up to 600 VAC.
Otherwise use three PTs.

Figure 5-3: 3-phase 4-wire WYE connection

L1 L2 L3 N LINE

PT if VAC LL 601 V
S1 CT
80 to 600 Vac LL
N998

0.25 A
*
S2
CT
S1

*
50mA to 6A

44 to 300 V 50/60 Hz <5 VA

S/N:COYWWDXXXX Acc CI: X.X

S2
CT
S1 Other Meters
44 to 300 VAC/DC
* Aux Supply
(Control power)
S2

D1 D0
LOAD RS 485
Communication

* Other Meters (In Series)

NOTE:
Make sure WYE/Star is programmed in the power meter PROG menu- Setup.
For High – leg (US connection)
L1 – N = 120 V
L2 – N = 208 V
L3 – N = 120 V

48 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 5 – Installation

3-phase 3-wire delta connection

Direct voltage connection for the input voltages L-L up to 600 VAC.
Otherwise use three PTs

Figure 5-4: 3-phase 3-wire delta connection

L1 L2 L3
LINE

PT if VAC LL 601 V
CT
S1

80 to 600 Vac LL
0.25 A

N998
*
S2

50mA to 6A

44 to 300 V 50/60 Hz <5 VA

S/N:COYWWDXXXX Acc CI: X.X
CT
Other Meters
S1
44 to 300 VAC/DC
* Aux Supply
(Control power)
S2

D1 D0
LOAD RS 485
Communication
*Other Meters (In Series)

NOTE : Make sure Delta is programmed in the power meter PROG menu- setup. Leave the Vn
terminal disconnected.

3-phase 3-wire open delta connection

Direct voltage connection for the input voltages L-L up to 600 VAC.
Otherwise use two PTs.

Figure 5-5: 3-phase 3-wire open delta connection

L1 L2 L3
LINE

PT if VAC LL 601 V
CT
S1
80 to 600 Vac LL
N998

0.25 A
*
S2
50mA to 6A

44 to 300 V 50/60 Hz <5 VA

S/N:COYWWDXXXX Acc CI: X.X

CT
Other Meters
S1
44 to 300 VAC/DC
* Aux Supply
(Control power)
S2

D1 D0
LOAD RS 485 Communication
*Other Meters (In Series)

NOTE: Make sure Delta is programmed in the power meter PROG menu-setup.

© 2011 Schneider Electric. All rights reserved. 49

EM6400 Series Power Meters CTD7303
Chapter 5 – Installation 01/2011

2-phase 3-wire connection

Direct voltage connection for the input voltages L-L up to 600 VAC.
Otherwise use two PTs.

Figure 5-6: 2-phase 3-wire connection

* Other meters (in series) AC

80 to 600 Vac LL
N998
50mA to 6A

44 to 300 V 50/60 Hz <5 VA

S/N:COYWWDXXXX Acc CI: X.X
44 to 300 VAC/DC

D1 D0
RS 485

NOTE: Make sure 2-phase is programmed in the power meter PROG menu- setup.

Single-phase connection
Direct voltage connection for the input voltages L-L up to 600 VAC.
Otherwise use one PT.
1. Program the power meter in single-phase mode.
However, voltages primary and secondary need to be programmed as
Line to Line.
2. Connect the voltage and current inputs only to the V1 and A1 voltage
and current terminals of the power meter.
3. The unused current terminals (A2 and A3) must be shorted together to
reduce noise picked up in the power meter.
4. However, the energy parameter readings will be accurate.

Figure 5-7: Single-phase connection

L1 N

LINE

CT * Other meters (in series)

S1 0.25 A
80 to 600 Vac LL
N998

*
S2
50mA to 6A

44 to 300 V 50/60 Hz <5 VA

S/N:COYWWDXXXX Acc CI: X.X

Other Meters

44 to 300 VAC/DC
Aux Supply
(Control power)

D1 D0
LOAD
RS 485
Communication

50 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 6 – Data Communication

Chapter 6: Data Communication

This section is applicable only for EM6400 series power meters with RS 485
communication option.

RS 485 Data Port

Data Port advantages:
Rapid, on-line, real time readings into
Your own SCADA software or PLC.
Schneider Electric energy management software products such as ION™
Enterprise, Vijeo Citect, PowerLogic SCADA for pinpointing energy usage
and waste.
Schneider Electric ConPAD: Power meter programming and basic data
reading utility.
Data port has built-in impedance matched design for low reflectance on
long data cables at high Baud rates. Eliminates need for complicated
impedance matching resistors at the ends of long data cables.
Fast 16 ms power meter response, average time to read 10 parameters is
90 to 100 ms (9600 Baud, Even parity, One stop bit).
Direct reading, pre-scaled Float readings. Accurate, full precision low, and
high readings. No need for additional scaling factors or decimal
adjustment.
Fast, easy-to-use grouping of parameters tuned for field requirements.
TURBO area for single point polling (upto 50 per query)
Block area for even faster access to pre-configured data blocks

Installation
Figure 6-1: 2-wire half duplex communication connection

EM 6400 power meters rear view

RS 485
communication port

R R

G -+
RS 485

RS 485
Data
Converter

RS 232

© 2011 Schneider Electric. All rights reserved. 51

EM6400 Series Power Meters CTD7303
Chapter 6 – Data Communication 01/2011

Figure 6-2: Closed loop, 2-wire half duplex.

Advantage – Reliable communications, tolerant to one break in the
cable.
EM6400 power meters rear view

RS 485
communication port

G
RS232

RS485
RS 485 Data

- +
Converter

Communication Capabilities
Table 6-1: RS 485 communication distances
Baud Rate Maximum communication distances 1 to 32 devices
Meters
9600 1200
19200 900

NOTE: Distances listed should be used as guide only and cannot be guaranteed for non-
Schneider Electric devices. Above distances subject to vary based on the quality of the cable.

Daisy-chaining Devices to the Power Meter

RS 485 slave port allows the power meter to be connected in a daisy chain
with up to 31 2-wire devices. In this bulletin, communications link refers to a
chain of devices that are connected by a communications cable. See Figure
6-3.

Figure 6-3: Daisy-chaining 2-wire devices

MCT2W-485 terminator
on the last device of
the daisy chain

+ -
Towards PC
EM6400 series power or other Schneider Electric 2-wire compatible devices
If the power meter is the first device on the daisy chain, connect it to the
host device using a RS 232 to RS 422/RS 485 converter or RS 485 to
Ethernet converter.
If the power meter is the last device on the daisy chain, terminate it with
the terminator provided.

52 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 6 – Data Communication

See ―Table 6-1‖ on page 52, for the maximum daisy-chain communications
distances for 2-wire devices.
The terminal‘s voltage and current ratings are compliant with the
requirements of the EIA RS 485 communications standard.
NOTE: For better performance, Schneider Electric recommend to use SWG 100 % shielded
cable with low resistance (Belden or Lapp make).

Data Formats and Settings

Your SCADA software must be configured for Modbus RTU communication,
before integrating the Schneider Electric EM6400 series power meter.
The mode of transmission is defined in the following which is compatible
with Modbus RTU Mode:

Table 6-2: Power meter communication and protocol settings

Power meter communication settings

Protocol Modbus RTU
Data bits 8
Baud rate 9600 Baud, User set 1200 to 19200
Range:1200, 2400, 4800, 9600, 19200
Normal use: 9600 Baud
Noisy, EMI, RFI, long data cable: 4800/2400 Baud
Short cable (< 300 meters or 975 feet): 19200 Baud

Parity Even
Device Address 1

Stop bit 1
Modbus Protocol
Device Address 1 to 247
Upto 247 meters per COM port with repeaters

Function Code 03 (Read)

Data Address Refer to ‖Data address‖ on page 57 for more information
Data type 32-bit float (real) :
All parameters.
Direct reading, little end
ian float, no scaling required
32-bit unsigned integer :
INTR (number of interruptions (outages) - RMS Blocks)
RunSec (Run seconds – Integ Block)
No of Registers 2 to 50 (optional) per power meter data block of 10 x 32 bit values
must be configured to suit the power meter

NOTE: The polling interval to poll the data from EM6400 power meter will depend on baud rate.
We recommend polling interval of one second at 9600 Baud rate.

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EM6400 Series Power Meters CTD7303
Chapter 6 – Data Communication 01/2011

Parameter Settings for Different SCADA Software

The following table explains how to read the parameter VA (See ―Individual
parameter address‖ on page 57 for more information) in different Modbus
master software/PLC‘s.

Table 6-3: Parameter settings

SL. SCADA software Start Function No. of Data Type Remarks

No Address Code Register
1 ION™ Enterprise 43901 Internally 2 Swapped Float Direct
configured conversion
2 PowerLogic 43901 Internally 2 Real Direct
SCADA configured conversion
3 Vijeo Citect 43901 Internally 2 Real Direct
configured conversion
4 Intouch 43901 F Nil 2 Float Direct
conversion
5 Modscan 3901 03 – 2 Floating point Unswapped FP
(Master) HOLDING mode
REGISTERS
6 MODTEST 43901 03 – Points -1 Float-
Rosemount Rosemount
7 CIMPLICITY 43901 Nil 100 Real Direct
conversion. The
array concept
can be used
here to poll all
the data in
single scan.
8 Allenbradly – 43901 03-HOLDING 2 Floating point Direct
Micrologix PLC REGISTERS
(Slave/Master)
9 GE Fanuc PLC 43901 03-HOLDING 2 Real Direct
REGISTERS
10 ABB RTU 560 Index-3900 03- Read Query MFI – Analog Under sub
(Mater) HOLDING Range - 2 measured parameters,
REGISTERS Floating value ―Sign and
Exponent in
First Register‖
should be
disabled
(Unchecked)
11 SEIMENS PLC 3900 03-HOLDING 2 Real Direct
(Master) REGISTERS
12 MOVICON 43901 Nil 2 Real Direct
13 RSVIEW 43901 03-HOLDING 2 Real Direct
REGISTERS
14 ABB Microscada 3900 Format – 9 Interval – 2 Real Direct

54 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
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Communication Test
Communication test: EM6400 series power meter can be successfully
used for communication using Modscan software as Modbus master in PC.
Details of the settings in Modscan are given below.

Settings in Modscan v3.D05-00 software to establish communication

with power meters:
Free download demo Modscan software from http://www.win-tech.com.
The following explains how to read apparent power total (VA total) from
register 3901.

1. After starting the Modscan, to read Apparent power total (VA total), enter
address as 3901 (decimal), length as 2, device ID as 1, Modbus point
type as 03, and HOLDING REGISTER.
2. Modify the connection details: Click connection > connect, to see the
connection detail window. Change all the settings to match the
following screen. These are default settings of the power meter.

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EM6400 Series Power Meters CTD7303
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3. Set the Modbus protocol selections: On Connection details window

(shown in previous step), click on Protocol Selections. Enter the
protocol settings as shown below and click OK in all the windows.

4. The Modscan software starts polling the configured COM port for the
Device ID 1.
Modscan Demo software will stop polling after 3.5 minutes on successful
communication.

This shows that the power meter is communicating with the Modbus
Modscan master software successfully on the PC. The power meter is
Modbus RTU compliant.

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CTD7303 EM6400 Series Power Meters
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Data Address
The EM6400 power meter supports the transfer of whole block and also of
individual data values (two registers are used for storing single data value).
In the transfer of individual data values, it treats two registers as an object
with the starting address (e.g., 3900) considered as the object name. This
enables you to transfer required data values for energy management.
In the transfer of the whole block, it basically treats each block as an object
with the starting address (e.g.,3000) considered as the object name. This
enables fast block transfers, since energy management usually requires a
block of related readings for the same point of time. This method also
eliminates time-skew within readings of that block.
The device address, block start address, number of registers, must be
configured to suit the power meter. You must also make the related
SCADA settings for polling priority, logging, and viewing the data. Refer
your SCADA software instructions to learn how to do this.

Individual Parameter Address

Function Code: 03 Read
No scaling required
Read as block or individual parameters

Table 6-4: Individual parameter address

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
Metering
Metering - Current
A Current average 3913 Float ● ● ● ●
A1 Current, phase 1 3929 Float ● ● ● ●
A2 Current, phase 2 3943 Float ● ● ● ●
A3 Current, phase 3 3957 Float ● ● ● ●
Metering – Voltage
VLL Line to line average voltage 3909 Float ● ● ●
VLN Line to neutral voltage 3911 Float ● ● ●
V12 Voltage phase 1 to phase 2 3925 Float ● ● ●
V23 Voltage phase 2 to phase 3 3939 Float ● ● ●
V31 Voltage phase 3 to phase 1 3953 Float ● ● ●
V1 Voltage phase 1 to neutral 3927 Float ● ● ●
V2 Voltage phase 2 to neutral 3941 Float ● ● ●
V3 Voltage phase 3 to neutral 3955 Float ● ● ●
Metering – Power
W Active power, total 3903 Float ● ● ● ●
W1 Active power, phase 1 3919 Float ● ● ● ●
W2 Active power, phase 2 3933 Float ● ● ● ●
W3 Active power, phase 3 3947 Float ● ● ● ●
VAR Reactive power, total 3905 Float ● ●
VAR1 Reactive power, phase 1 3921 Float ● ●
VAR2 Reactive power, phase 2 3935 Float ● ●
VAR3 Reactive power, phase3 3949 Float ● ●
VA Apparent power, total 3901 Float ● ● ● ●
VA1 Apparent power, phase 1 3917 Float ● ● ● ●
VA2 Apparent power, phase 2 3931 Float ● ● ● ●
VA3 Apparent power, phase 3 3945 Float ● ● ● ●
Metering – Power Factor
PF Power factor average 3907 Float ● ● ● ●
PF1 Power factor, phase 1 3923 Float ● ● ● ●
PF2 Power factor, phase 2 3937 Float ● ● ● ●

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EM6400 Series Power Meters CTD7303
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Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433

PF3 Power factor, phase 3 3951 Float ● ● ● ●

Metering - Frequency
F Frequency, Hz 3915 Float ● ● ●
Power Quality
THD
%V1 Voltage THD, phase 1 3861 Float
%V2 Voltage THD, phase 2 3863 Float
%V3 Voltage THD, phase 3 3865 Float
%A1 Current THD, phase 1 3867 Float
%A2 Current THD, phase 2 3869 Float
%A3 Current THD, phase 3 3871 Float
Energy
FwdVAh Forward apparent energy 3959 Float ● ● ● ●
FwdWh Forward active energy 3961 Float ● ● ● ●
FwdVARh Forward reactive inductive 3963 Float ● ●
energy
FwdVARh Forward reactive capacitive 3965 Float ● ●
energy
RevVAh Reverse apparent energy 3967 Float ●
RevWh Reverse active energy 3969 Float ●
RevVARh Reverse reactive inductive 3971 Float ●
Energy
RevVARh Reverse reactive capacitive 3973 Float ●
Energy
On hrs1.1.1. On hours 3993 Long ● ● ● ● ●
FwdRun secs Forward run seconds 3995 Long ● ● ● ●
RevRun secs Reverse run seconds 3997 Long
Intr Number of power 3999 Long ● ● ● ● ●
interruptions
Demand
Present Demand Present demand 3975 Float ●
Rising Demand Rising demand 3977 Float ●
Max MD Maximum demand 3979 Float ●
Max DM1.1.2. Maximum demand occurrence 3981 Long ●
Occurrence Time time
Percentage of Load parameters
% Avg Load Average load percentage 3881 Float ●
%L1 Percentage of phase 1 load 3883 Float ●
%L2 Percentage of phase 2 load 3885 Float ●
%L3 Percentage of phase 3 load 3887 Float ●
Unbalanced
1.1.3. Unbalanced %load 3889 Float ●
%Load
Unbalanced
1.1.4. % Unbalanced % voltage 3891 Float ●
voltage

NOTE: THD values are indicative only.

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CTD7303 EM6400 Series Power Meters
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Block Parameter Address

Total RMS Block
Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only

Table 6-5: Total RMS block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
VA Apparent power, total 3001 Float ● ● ● ●
W Active power, total 3003 Float ● ● ● ●
VAR Reactive power, total 3005 Float ● ●
PF Average PF 3007 Float ● ● ● ●
VLL Average line to line voltage 3009 Float ● ● ●
VLN Average line to neutral voltage 3011 Float ● ● ●

A Average current 3013 Float ● ● ● ●

F Frequency, Hz 3015 Float ● ● ●
Reserved Reserved 3017 Long
Intr Number of interruption 3019 Long ● ● ● ● ●

R phase RMS Block:

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only

Table 6-6: R phase RMS block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
VA1 Apparent power, 3031 Float ● ● ● ●
phase1
W1 Active power, phase1 3033 Float ● ● ● ●
VAR1 Reactive power, 3035 Float ● ●
phase1
PF1 Power factor, phase1 3037 Float ● ● ● ●
V12 Voltage phase1 to 3039 Float ● ● ●
phase2
V1 Voltage phase1 to 3041 Float ● ● ●
neutral
A1 Current, phase1 3043 Float ● ● ● ●
F1 Frequency, Hz 3045 Float ● ● ●
Reserved Reserved 3047 Long
Intr1 Number of 3049 Long ● ● ● ● ●
interruption

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EM6400 Series Power Meters CTD7303
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Y phase RMS Block:

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only

Table 6-7: Y phase RMS block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
VA2 Apparent power, phase 2 3061 Float ● ● ● ●
W2 Active power, phase 2 3063 Float ● ● ● ●
VAR2 Reactive power, phase 2 3065 Float ● ●

PF2 Power factor, phase 2 3067 Float ● ● ● ●

V23 Voltage phase 2 to phase 3 3069 Float ● ● ●

V2 Voltage phase 2 to neutral 3071 Float ● ● ●

A2 Current, phase 2 3073 Float ● ● ● ●
F2 Frequency, Hz 3075 Float ● ● ●
Reserved Reserved 3077 Long
Intr2 Number of interruption 3079 Long ● ● ● ● ●

B phase RMS Block:

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only

Table 6-8: B phase RMS block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
VA3 Apparent power, 3091 Float ● ● ● ●
phase 3
W3 Active power, phase 3 3093 Float ● ● ● ●

VAR3 Reactive power, phase 3095 Float ● ●

3
PF3 Power factor, phase 3 3097 Float ● ● ● ●

V31 Voltage phase 3 to 3099 Float ● ● ●

phase 1
V3 Voltage phase 3 to 3101 Float ● ● ●
neutral
A3 Current, phase 3 3103 Float ● ● ● ●

F3 Frequency, Hz 3105 Float ● ● ●

Reserved Reserved 3107 Long

Intr3 Number of interruption 3109 Long ● ● ● ● ●

60 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 6 – Data Communication

Forward Integrated Block

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only

Table 6-9: Forward integrated block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
FwdVAh Forward apparent energy 3121 Float ● ● ● ●
FwdWh Forward active energy 3123 Float ● ● ● ●
FwdVARh Forward reactive inductive energy 3125 Float ● ●

Reserved Reserved 3127 Float

Reserved Reserved 3129 Float
FwdVARh Forward reactive capacitive energy 3131 Float ● ●

Reserved Reserved 3133 Float

Reserved Reserved 3135 Float
Reserved Reserved 3137 Long
FwdRunsecs Forward run seconds 3139 Long ● ● ● ●

Reverse Integrated Block:

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only

Table 6-10: Reverse integrated block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
RevVAh Reverse apparent energy 3151 Float ●

RevWh Reverse active energy 3153 Float ●

RevVARh Reverse reactive inductive energy 3155 Float ●

Reserved Reserved 3157 Float

Reserved Reserved 3159 Float
RevVARh Reverse reactive capacitive energy 3161 Float ●

Reserved Reserved 3163 Float

Reserved Reserved 3165 Float
Reserved Reserved 3167 Long
RevRunsecs Reverse run seconds 3169 Long ●

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EM6400 Series Power Meters CTD7303
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Total Integrated Block:

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only

Table 6-11: Total integrated block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
TotVAh Total apparent energy 3181 Float ●
TotWh Total active energy 3183 Float ●
TotVARh Total reactive inductive energy 3185 Float ●

Reserved Reserved 3187 Float

Reserved Reserved 3189 Float
TotVARh Total reactive capacitive energy 3191 Float ●

Reserved Reserved 3193 Float

Reserved Reserved 3195 Float
Reserved Reserved 3197 Long
TotRunsecs Total run seconds 3199 Long ●

Demand Block:
Function Code: 03H Read
Number of registers: 22
No scaling required
Read as block only

Table 6-12: Demand block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
Reserved Reserved 3721 Long
Reserved Reserved 3723 Float
Reserved Reserved 3725 Float
Reserved Reserved 3727 Float
Reserved Reserved 3729 Float
Reserved Reserved 3731 Float
Reserved Reserved 3733 Float
Present demand Present demand 3735 Float ●
Rising demand Rising demand 3737 Float ●
Time remaining Time remaining 3739 Long ●
Reserved Reserved 3741 Float

Note: The address 3741 is overlapped between the demand and max demand blocks.

62 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 6 – Data Communication

Max Demand Block:

Function Code: 03H Read
Number of registers: 36
No scaling required
Read as block only

Table 6-13: Max demand block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
1.1.5. 6400
MaxDM Maximum demand 3741 Float ●

MaxDMTime Maximum demand occurrence time 3743 Long ●

Reserved Reserved 3745 Float

Reserved Reserved 3747 Long

Reserved Reserved 3749 Float

Reserved Reserved 3751 Long

Reserved Reserved 3753 Float

Reserved Reserved 3755 Long

Reserved Reserved 3757 Float

Reserved Reserved 3759 Long

Reserved Reserved 3761 Float

Reserved Reserved 3763 Long

Reserved Reserved 3765 Float

Reserved Reserved 3767 Long

Reserved Reserved 3769 Float

Reserved Reserved 3771 Long

Reserved Reserved 3773 Float
Reserved Reserved 3775 Long

Note: The address 3741 is overlapped between the Demand and Max Demand blocks

Old Forward Integrated Block

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only

Table 6-14: Old forward integrated block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
OldFwdVAh Old forward apparent energy 3122 Float ● ● ● ●
OldFwdWh Old forward active energy 3124 Float ● ● ● ●
OldFwdVARh Old forward reactive inductive energy 3126 Float ● ●

Reserved Reserved 3128 Float

Reserved Reserved 3130 Float
OldFwdVARh Old forward reactive capacitive energy 3132 Float ● ●
Reserved Reserved 3134 Float
Reserved Reserved 3136 Float
Reserved Reserved 3138 Long
OldFwdRunsecs Old forward run seconds 3140 Long ● ● ● ●

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EM6400 Series Power Meters CTD7303
Chapter 6 – Data Communication 01/2011

Old Reverse Integrated Block:

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only

Table 6-15: Old reverse integrated block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
OldRevVAh Old reverse apparent energy 3152 Float ●

OldRevWh Old reverse active energy 3154 Float ●

OldRevVARh Old reverse reactive inductive energy 3156 Float ●

Reserved Reserved 3158 Float

Reserved Reserved 3160 Float
OldRevVARh Old reverse reactive capacitive energy 3162 Float ●

Reserved Reserved 3164 Float

Reserved Reserved 3166 Float
Reserved Reserved 3168 Long
OldRevRunsecs Old reverse run seconds 3170 Long ●

Old Total Integrated Block:

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only

Table 6-16: Old total integrated block

Parameter Description Address Type EM EM EM EM EM

6400 6459 6434 6436 6433
OldTotVAh Old total apparent energy 3182 Float ●
OldTotWh Old total active energy 3184 Float ●
OldTotVARh Old total reactive inductive energy 3186 Float ●
Reserved Reserved 3188 Float
Reserved Reserved 3190 Float
OldTotVARh Old total reactive capacitive energy 3192 Float ●

Reserved Reserved 3194 Float

Reserved Reserved 3196 Float
Reserved Reserved 3198 Long
OldTotRunsecs Old total run seconds 3200 Long ●

64 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 6 – Data Communication

Phase Angle Block:

Function Code: 03H Read
Number of registers: 18
No scaling required
Read as block only
Table 6-17: Phase angle block
Parameter Description Address Type EM EM EM EM EM
6400 6459 6434 6436 6433
Neutral voltage Neutral voltage 3701 Float ● ●

An Neutral current 3703 Float ● ●

V1 Voltage phase angle, phase 1 3705 Float ● ●

V2 Voltage phase angle, phase 2 3707 Float ● ●

V3 Voltage phase angle, phase 3 3709 Float ● ●
A1 Current phase angle, phase 1 3711 Float ● ●

A2 Current phase angle, phase 2 3713 Float ● ●

A3 Current phase angle, phase 3 3715 Float ● ●
RPM Rotations per minute 3717 Float ● ●

Note: The parameters V1, V2, V3 (voltage phase angles), neutral voltage, and neutral current
are available only through communication.

NOTE:
Most of the reserved and unavailable parameters return zero value.
The SCADA software must support register blocks consisting of different data types (integers
and floats) to transfer of whole block.
Each Modbus register size is 16 bits. All the power meter readings are 32 bits. Therefore,
each power meter reading occupies two consecutive Modbus registers. For example, VA
parameter absolute address is 3901. It occupies both 3901 and 3902 Modbus registers.
Address configuration: All addresses are in decimal. Some SCADA software supports
Modbus register address instead of absolute register address. In this case add 40000 to the
above address and use it. For example, VA parameter absolute address is 3901. Modbus
address can be 43901 (40000+3901).
Phase Angle Block: Voltage phase angles (0,120,240) are hard coded (not measured).
Hence, these values are also available in communication in the absence of input signals;
however, these voltage phase angles are not available in the power meter display.
TURBO, and Percentage of Load Blocks: These parameters can be read individually or as a
block
TURBO block: 50 parameters maximum
Percentage of Load block: 5 parameters maximum
All power meters addresses should be set between 1 and 247.
All power meters should have uniform communication settings like Baud rate, parity and stop
bit.
Use Diagnostic mode display in the power meter to analyze the problem in communication.
Error: u – Invalid unit ID
A – Invalid Address
c – CRC error (cyclic redundancy checking)
t – Transmitting
r – Receiving
F – Invalid function code
o – Parity, framing or overrun error
O- Buffer overflow

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EM6400 Series Power Meters CTD7303
Chapter 6 – Data Communication 01/2011

66 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 7 – Maintenance And Troubleshooting

Chapter 7: Maintenance and Troubleshooting

Introduction
This chapter describes information related to maintenance of your power
meter.

The power meter does not contain any user-serviceable parts. If the power
meter requires service, contact your local sales representative. Do not open
the power meter. Opening the power meter voids the warranty.

HAZARD OF EQUIPMENT DAMAGE

Do not perform a Dielectric (Hi-Pot) or Megger test on the power meter, test
voltages may damage the power meter..
Before performing Hi-Pot or Megger testing on any equipment in
which the power meter is installed, disconnect all input and output
wires to the power meter.

Failure to follow these instructions will result in equipment damage.

© 2011 Schneider Electric. All rights reserved. 67

EM6400 Series Power Meters CTD7303
Chapter 7 – Maintenance And Troubleshooting 01/2011

Troubleshooting
The information in Table 7–1 describes potential problems and their possible
causes. It also includes possible checks to perform or solutions to the
problems. After referring to this table, if you cannot resolve the problem,
contact your local Schneider Electric sales representative for assistance.

D DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Apply appropriate personal protective equipment (PPE) and
follow safe electrical practices. For example, in the United
States, see NFPA 70E.
This equipment must be installed and serviced only by qualified
personnel.
Turn off all power supplying this equipment before working on or inside.
Always use a properly rated voltage sensing device to confirm
that all power is off.
Carefully inspect the work area for tools and objects that may
have been left inside the equipment.
Use caution while removing or installing panels so that they do
not extend into the energized bus; avoid handling the panels,
which could cause personal injury.
Failure to follow these instructions will result in death or serious
injury.

Table 7-1: Trouble shooting

Potential Problem Possible Cause Possible Solution

The data being displayed Incorrect setup values Check that the correct
is inaccurate or not what values have been entered
you expect. for power meter setup
parameters (CT and PT
ratings, system type, and
so on). See ―PROG menu
- Setup‖ on page 19 for
setup instructions.
Usage of protection class Use instrument class 1 or
(10P10 etc.) CTs/PTs better CTs/PTs, which will
have better accuracy than
the protection class
CTs/PTs.
Improper wiring Check whether all the PTs
and CTs are connected
properly (proper polarity is
observed) and that they
are energized. Check
shorting terminals. See
―connection diagrams ―on
page 48 for more
information.
Active Power (W) reading CT may be reversed Check and correct the CT
is negative connections.
Power may be in export 1. Check the mode. If the
mode mode is in import, s1 s2
need to be interchanged
in one or two or in all the
three phases. Under
this condition, the
energy will update in
INTG Rev.
2. Check the mode. If it is
in export, then the
energy will update in
INTG Rev.

68 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter 7 – Maintenance And Troubleshooting

Potential Problem Possible Cause Possible Solution

The display went blank Over voltage/temperature Interrupt the power supply
suddenly. or reduce the voltage or
temperature within the
limit.
Fuse connection Check whether a fuse with
rating of 0.25 A is
connected on each
voltage input. If not
connect the 0.25 A rated
fuse to the voltage input.
The power meter stopped Communications lines are Verify the power meter
communication abruptly. improperly connected. communications
connections. See ―Chapter
6 – Data communication‖
on page 51 for more
information.
Over voltage/temperature Interrupt the power supply
or reduce the voltage or
temperature within the
allowable limits.
Incorrect Load bar Incorrect F.S% selection Select the full scale load
indication percentage setting as per
your circuit.
The power meter is over Lack of sufficient air for Provide sufficient space all
heated cooling around the power meter.
Separate the power meter
from other equipment for
cooling air.

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EM6400 Series Power Meters CTD7303
Chapter 7 – Maintenance And Troubleshooting 01/2011

70 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Chapter A: Technical Data

Appendix A – Technical Data

Accuracy
Table A-1: Accuracy

Measurement Accuracy % of Reading

Class 1.0 Class 0.5S Class 0.2S
Voltage LN per phase and 1.0 0.5 0.2
average
Voltage LL per phase and 1.0 0.5 0.2
average
Amp per phase and average 1.0 0.5 0.2
Amp, phase angle per phase 2º 1º 1º
Frequency 0.1 0.1 0.1
Active power, (kW) per 1.0 0.5 0.2
phase and total
Reactive power, (kVAR) per 2.0 1.0 0.5
phase and total
Apparent power, (kVA) per 1.0 0.5 0.2
phase and total
Active energy (kWh) 1.0 0.5 0.2
Import/Export
Reactive energy (kVARh) 2.0 1.0 0.5
(Inductive / Capacitive)
Apparent energy ( kVAh) 1.0 0.5 0.2
RPM 1.0 0.5 0.2

NOTE:
5 A meter - Additional error of 0.05 % of full scale for meter input current below 100 mA.
1 A meter - Additional error of 0.05 % of full scale for meter input current below 20 mA.
PF error limit is same as W error limit in %.

Auxiliary supply (Control power)

The power meter needs a single-phase AC or DC control supply to power its
internal electronics.
Range: 44 to 300 VAC/DC.
Burden (load): 3 VA max on Auxiliary supply.

Front Panel Display

Brilliant three lines four digits (digit height 14.2 mm/0.56 in.) per line, high
readability alpha numeric LED display with auto scaling capability for Kilo,
Mega, Giga.
The display provides the user access to all phase voltages (phase to
neutral and phase to phase), currents (per phase and average), Watts,
VARs, VA, power factor, frequency, kWh, kVAh, and kVARh.
The power meters display average volts, amps, and frequency
simultaneously.
Load bar graph for the indication of consumption in terms of % amperes
total.
Set of four red LED‘s in the load bar start blinking when the load is greater
than 120%, to indicate overload.

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EM6400 Series Power Meters CTD7303
Appendix A: Technical Data 01/2011

Easy setup through keys located on the faceplate for common

configuration parameters.
Password protection for setup parameters.
User-selectable default display page through keypad lock.

Installation and Input Ratings

Auto-ranging voltage inputs should allow direct connection up to 347
VLN/600VLL AC systems, no PTs (VTs) required up to 600 VLL phase to
phase).
Supports the following configurations (field configurable):
Direct 4-wire Wye (Star); 3-wire Wye (Star); 3-wire Delta; 2-phase 3-wire
(2-phase), and single-phase.
3-phase voltage, and current inputs
Volts : 46 to 347 VAC phase-neutral, 80 to 600 VAC phase-phase,
Overload: Continuous 600 VLL with full accuracy, 750 VLL Max, Hz. 50 /
60
Amperes: 5 mA (starting )to 6 A, Overload: 10 A continuous, 50 A for three
seconds
User programmable for 5 A or 1 A secondary CTs
Burden (Load): Less than 0.2 VA per Volt / Ampere input
Frequency (Both input and auxiliary): 50 / 60 Hz, 45 to 65 Hz

Environmental Conditions
Sealed dust- proof construction. Meets IP51 for the front panel and IP40
for rear panel.
Operating temperature: -10 C to 60 C , (14 F to 140 F)
Storage temperature: -25 C to 70 C, (-13 F to 158 F)
Humidity: 5% to 95%, non-condensing

Construction
Self-extinguishable V0 plastic, double insulation at accessible areas.
Pollution Degree II.
Measurements Category III.

Dimensions and Shipping

Basic unit installed depth 83 mm with 92 x 92 mm panel cut-out, flush
mount.
Bezels dimension 96 x 96 mm. Panel Cut-out 92 x 92 mm.
Weight 400 gms approx unpacked, 500 gms approx shipping. See
―Mechanical Installation‖ on page 39 for more information.

72 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Appendix B: SIM Mode

Appendix B: SIM (simulation) Mode

The EM6400 series power meters are provided with SIM mode for demo
and exhibition display, where the user can see the functioning of the power
meter without any input signals. The power meter will show a fixed voltage,
current, frequency, and 0.5PF. Power and energy parameters are calculated
based on the V, A, and PF displayed.

To Enter SIM mode

Keep the pressed, while powering up the power meter. The display
shows RUN.
Press . The display shows SIM.
Press . The display shows RMS SIM. You have successfully
entered the SIM mode of the power meters.

To Exit from SIM mode

Press and hold the , until you reach the RMS page.
Press . The display shows SIM.
Press . The display shows RUN.
Press . The display shows RMS indicating the exit from SIM mode

© 2011 Schneider Electric. All rights reserved. 73

EM6400 Series Power Meters CTD7303
Appendix B – SIM Mode 01/2011

74 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Appendix C – Glossary

Appendix C: Glossary
Terms
Auto (sliding block): An interval selected from five to 30 minutes. The
power meter calculates and updates the demand every 15 seconds.

Baud rate: Specifies how fast data is transmitted across a network port.

Communications link: A chain of devices connected by a communications

cable to a communications port.

Current Transformer (CT): Current transformers for current inputs.

Demand: Average value of a quantity, such as power, over a specified

interval of time.

Firmware: Operating system within the power meter.

Float: A 32-bit floating point value returned by a register (See ―Data

Address‖ on page 57 for more information).

Forward: Importing the power into the plant/grid.

Frequency: Number of cycles in one second.

Line-to-line voltages: Measurement of the RMS line-to-line voltages of the

circuit.

Line-to-neutral voltages: Measurement of the RMS line-to-neutral voltages

of the circuit.

LOCK: Default display page lock (See ―Default display (View) page‖ on page
12 for more information).

Long: A 32-bit value returned by a register (See ―Data Address‖ on page 57

for more information).

Maximum demand: Highest average load during a specific time interval.

Nominal: Typical or average

Parity: Refers to binary numbers sent over the communications link. An extra
bit is added so that the number of ones in the binary number is either even or
odd, depending on your configuration. Used to detect errors in the
transmission of data.

Power factor: True power factor is the ratio of real power to apparent power
using the complete harmonic content of real and apparent power.

Reverse: Exporting the power from the plant/grid.

RMS: Root mean square. The power meters are true RMS sensing devices.

Run mode: This is the normal operating mode of the power meter, where
the readings are taken.

Total Harmonic Distortion (THD): Indicates the degree to which the

voltage or current signal is distorted in a circuit.

ULOC: Default display page unlock (See ―Default display (View) page‖ on
page 12 for more information).

© 2011 Schneider Electric. All rights reserved. 75

EM6400 Series Power Meters CTD7303
Appendix C – Glossary 01/2011

User (fixed block): An interval selected between five to 30 minutes. The

power meter calculates and updates the demand at the end of each interval.

76 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Appendix C – Glossary

Abbreviations
%A FS % Amperes full scale
A, Amps Amperes
An Neutral current
A.PRI Current primary winding

A.SEC Current secondary winding

Avg Average
CLR Clear
CT Current transformer
Dia, DIAG Diagnostic
ft Feet/foot
FW Firmware
FWD Forward
Hz Hertz
ID Identity
in. Inch
INTG Integrator
IP Ingress protection
kVAh Kilo volt-ampere hour
kVARh Kilo volt-ampere reactive hour
kWh Kilo watt hour
LSB Least significant bit
MD Maximum demand
Min Minimum
ms Milliseconds
MSB Most significant bit
O.F Overflow
PF Power factor
PT Potential transformer
R.d Rising demand
Rev Reverse
RPM Revolution per minute
SYS System configuration
THD Total harmonic distortion
ULOC Unlock
Unb Unbalance
V Voltage
VA Apparent power
VAh Apparent energy
VAR Reactive power
VARh Reactive energy (inductive)
-VARh Reactive energy (capacitive)
V.PRI Voltage primary winding
V.SEC Voltage secondary winding
VT Voltage transformer
W Active power
Wh Active energy

© 2011 Schneider Electric. All rights reserved. 77

EM6400 Series Power Meters CTD7303
Appendix C – Glossary 01/2011

78 © 2011 Schneider Electric. All rights reserved.

CTD7303 EM6400 Series Power Meters
01/2011 Index

INDEX
AC Power Measurement Display lock and unlock, 12

3D kVA Measurement, 38 Demand Power Calculation Methods

Consumption and Poor PF, 38 Auto - Sliding block, User - Fixed block, 29

3-phase systems, 37 Electrical installation, 42

Auto scroll Energy Integrator

Within page group, column of pages and Integrator overflow, OLD data register, 28
TURBO pages, 12 Front panel
Block parameter address Kilo, Mega, Giga and negative indicators, 9
B Phase RMS block, 60 LED display, Load bar, 8
Forward Integrated block, Reverse Integrated INTR, 28
block, 61
Keys
Max Demand block, OLD Forward Integrated
block, 63 Left, Right, Up, Down keys, 10
OLD Reverse Integrated block, OLD Total Operation, 11
Integrated block, 64
Maintenance and troubleshooting, 67
Phase angle block, SETUP block, 65
Mechanical Installation, 39
Total Integrated block, Demand block, 62
Panel considerations and Environment, 40
Total RMS block, R phase RMS block, 59
on.h, 28
Y Phase RMS block, 60
Parameters with power meters,14
Clear
EM6400 Series Menu hierarchy, 34
INTG, 26
EM6400 series power meters product
MD, 27 description, 7
Communication Test, 55 PROG menu - Setup
Connections List of setup parameters in View & Edit modes,
22
Connection diagram symbols, 48
Quick setup - While powering on, 19
Delta connection, 49
Setup entry in View mode, 21
Fuse recommendations, 45
Setup entry in Edit mode, 21
Open delta connection, 49
Setup parameters editing, 24
Single-phase connection, 50
Rear Panel, 13
2-phase connection, 50
Safety
Wye/star connection, 48
Precautions, 17
Data Address
Symbols, 3
Block parameter address, 59
SIM (simulation) mode, 73
Individual parameter address, 57
Technical specifications, 16
Data communication, 51
Total RMS block, 59
Daisy chaining devices to the power meter, 52
TURBO Key, 10
Data formats and settings, 53
Default display (View) page

© 2011 Schneider Electric. All rights reserved. 79

EM6400 Series Power Meters CTD7303
Index 01/2011

80 © 2011 Schneider Electric. All rights reserved.

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