Conzerv EM6430 Power Meters

User Manual
NHA12535-03
07/2015

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 a hazardous situation which, if not avoided, will result in

death or serious injury.

WARNING indicates a hazardous situation which, if not avoided, could result in

death or serious injury.

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

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.

NOTICE
NOTICE is used to address practices not related to physical injury.

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[Pick the date]

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.
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.

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EM6430 Power Meters

Table of Contents

NHA12535

Chapter 1 Product Description.......................................................................................................................6

Physical Description ..........................................................................................................................................6
Front Panel......................................................................................................................................................7
Rear Panel ....................................................................................................................................................12
Parameters ......................................................................................................................................................13
Technical Specifications ..................................................................................................................................14
Chapter 2: Safety Precautions ........................................................................................................................16
Chapter 3: Quick Start Guide ..........................................................................................................................17
PROG Menu Setup .....................................................................................................................................17
Quick Setup While powering ON ...............................................................................................................17
Enter Setup Menu in View (Read-Only) Mode..............................................................................................19
Enter Setup Menu in Edit Mode ....................................................................................................................19
Setup Parameters in View and Edit Modes ..................................................................................................20
Edit Set Parameters ......................................................................................................................................21
Energy Integrator .............................................................................................................................................23
Integrator Overflow .......................................................................................................................................23
Menu Hierarchy................................................................................................................................................25
Chapter 4: AC Power Measurement................................................................................................................26
3-Phase Systems .............................................................................................................................................26
Consumption and Poor Power Factor .............................................................................................................27
3D kVA Measurement ...................................................................................................................................27
Chapter 5: Installation ......................................................................................................................................28
Mechanical Installation ....................................................................................................................................28
Installation Procedure ...................................................................................................................................29
Electrical Installation ........................................................................................................................................31
Terminal connections using lugs ..................................................................................................................32
Auxiliary Supply (Control Power) ..................................................................................................................33
PTs (VTs) and CTs .......................................................................................................................................33
Voltage Signal Connections ..........................................................................................................................34
Current Signal Connections ..........................................................................................................................34
Setup System Type ..................................................................................................................................36
Phase Labels ................................................................................................................................................37
Connection Diagrams ...................................................................................................................................37
Chapter 6: Data Communication .....................................................................................................................41
Float Byte Register ..........................................................................................................................................41
Health Check Register .....................................................................................................................................41
Float Byte Order Detection ..............................................................................................................................41
RS 485 Data Port .............................................................................................................................................42
Installation ........................................................................................................................................................42
Communication Capabilities ............................................................................................................................43
Daisy-chaining Devices to the Power Meter ....................................................................................................43
Data Formats and Settings ..............................................................................................................................44
Modbus Standard Device Identification ...........................................................................................................44
Parameter Settings for Different SCADA Software ......................................................................................45
Communication Test .....................................................................................................................................46
Data Address ................................................................................................................................................48
Chapter 7: Maintenance and Troubleshooting ..............................................................................................57
4

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NHA12535

EM6430 Power Meters

Table of Contents

Introduction ......................................................................................................................................................57
Troubleshooting ...............................................................................................................................................58
Disposal and Recycle ......................................................................................................................................59
To Disassemble ...............................................................................................................................................59
Appendix A Technical Data ..........................................................................................................................60
Accuracy ..........................................................................................................................................................60
Auxiliary supply (Control Power)......................................................................................................................60
Front Panel Display .........................................................................................................................................60
Installation and Input Ratings ..........................................................................................................................61
Environmental Conditions ................................................................................................................................61
Construction .....................................................................................................................................................61
Dimensions and Shipping .............................................................................................................................61
Appendix B: SIM (simulation) Mode ...............................................................................................................63
Appendix C: Glossary ......................................................................................................................................64
Terms ............................................................................................................................................................64
Abbreviations ................................................................................................................................................65
INDEX .................................................................................................................................................................66

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NHA12535

EM6430 Power Meters

Chapter 1 Product Description

Chapter 1 Product Description

The EM6430 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 required before the power
meter is ready for use, and maintenance and troubleshooting procedures for
the power meter after installation.
The EM6430 power meter is a 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 EM6430 power meters with complete
user support and service.
Intended use: The EM6430 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 are 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 RS 485 communication
port are located on the back of the power meter. Refer to Rear panel on
page 13 for more information.

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NHA12535

EM6430 Power Meters

Chapter 1 Product Description

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 EM6430 power meter front panel

Color-coded analog
load bar

Eight-segment LED
display
Keys

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

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Load
percentage
Less than
10%
Between 10 to
40 %
Between 50 to
80%

Bar graph display

Above 80%

Red LEDs are lit to indicate that the load has exceeded the sanctioned
limit and is dangerous.

No LEDs are lit.

Amber LEDs are lit.
Green LEDs are lit to indicate that the load is acceptable and should not
be increased further.

EM6430 Power Meters

Chapter 1 Product Description

NHA12535

The Indicators Kilo, Mega, and Negative

Table 1-2 Indicators
3

Kilo: When lit, indicates that the reading is in Kilo (10 ). 10,000 is displayed
as 10.00 K and 1000 as 1.0 K.
6

Mega: When lit, indicates that the reading is in Mega (10 ). 10,000 K is
shown as 10.00 M and 1000 K as 1.0 M.
9

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

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NHA12535

EM6430 Power Meters

Chapter 1 Product Description

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, select 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 power up of the power meter.
See SIM (Simulation) mode on page 61 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 EM6430 power
meters are given below. EM6430: RMS (home page), 'VLL, A, PF 'VLN,
A, F, A, W, PF, 'PF1, PF2, PF3, Wh.
If youre 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.
the power up, if the TURBO key is pressed, then the power meter
goes directly into PROG menu Setup. This is the easiest way to
enter into the setup menu. See Quick setup While powering on
on page 19 for more information.

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EM6430 Power Meters

Chapter 1 Product Description

NHA12535

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 EM6430 power meter.
Navigation Concept

RMS VLL
A
PF

V12
23
31

VLN
A
F

1. From the RMS page, press

2. Now press

.The display shows VLN

A
F

3. To return to RMS, press

Use

. The display shows VLL

A
PF

.The display shows RMS.

to go forward to the sub-parameter page and use

backward to the main parameter pages. Use

down through the display pages.

and

to go

to scroll up and

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.

10

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NHA12535

EM6430 Power Meters

Chapter 1 Product Description

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
continuously for three seconds and then release. The display
flashes AUTO and starts auto-scroll through the TURBO pages.
NOTICE: 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 a 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 the default page.
Press
and
simultaneously to lock the page. The power meter
displays LOCK.
To unlock the user-set default page:
Once the default display page is active, press
and
to unlock the page. The power meter displays ULOC.

simultaneously

NOTICE: 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.
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.

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EM6430 Power Meters

Chapter 2 Safety Precautions

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Rear Panel
The EM6430 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

12

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NHA12535

EM6430 Power Meters

Chapter 1 Product Description

Parameters
The power meter can measure, locally display, and remotely transfer over
Modbus RTU protocol, the following parameters:
Table 1-5: Parameters
Parameter
RMS

INTG FWD
OLD FWD

VLL A PF
V12 V23 V31
VLN A F
V1 V2 V3
A W F
A1 A2 A3
W1 W2 W3
PF1 PF2 PF3
Wh
Wh

The EM6430 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
(A1, A2, A3) with respect to the corresponding voltage line-neutral
vector.
Frequency: Measures from whichever phase is active.
Power: W 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.
Intg: VAh , Wh (forward energy).
Intg (OLD): VAh, Wh (Old forward energy).
% 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.

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EM6430 Power Meters

Chapter 2 Safety Precautions

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Technical Specifications
The EM6430 power meters are high-accuracy, low cost, ultra-compact,
power, and energy meter. It offers ISO 9001 quality, accuracy, and
functional flexibility. This model has 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 a standalone meter in electrical
control panels, power distribution units (PDU), switch boards, uninterrupted
power supplies (UPS), generator sets, and motor control center (MCC)
systems. It also provides easy communication to program logic controls
(PLC), distributed control systems (DCS), building management systems
(BMS), and other systems.
The following table gives the technical specifications of the power meters.
Refer to Technical Data on page 59 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;

Class 0.5S (Optional) as per IEC 62052-11, 62053-22;
Class 0.2* (optional) ;

Auxiliary supply
(Control power)**

44 to 300 VAC/DC, CAT III

50/60 Hz

Burden

Voltage and current input: < 0.2 VA per phase

Auxiliary supply (control power): < 3 VA at 240 V, 5 VA Max
< 2 W at 300 V DC

Display

Alphanumeric bright LED

Resolution

RMS four digits, INTG eight digits

Input voltage

Four voltage inputs (V1, V2, V3, VN)

IEC: 80 to 480 V-LL (50 to 277 V-LN) CAT III
80 to 600 V-LL (50 to 350 V-LN) CAT II
UL: 80 to 600 V-LL

Input current***
(Energy measurement)

Current inputs (A1, A2, A3);

5 A Class 1.0/0.5S: 5 mA (starting) to 6 A
5 A Class 0.5S/0.2: 5 mA (starting) to 6 A
1 A Class 0.5S/0.2: 1 mA (starting) to 1.2 A

Frequency

45 to 65 Hz

Overload

5 A meter: 10 A max continuous, 50 A for 5 sec/hr, 120 A for

1 sec/hr
1 A meter: 2 A max continuous, 10 A for 5 sec/hr, 24 A for
1 sec/hr

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
Altitude 2000m

Safety

14

- Measurement category III, Pollution Degree 2,

- Double insulation at user-accessible area

Weight

400 gms approx, unpacked

500 gms approx, shipping

Communication
(optional)

RS-485 serial channel connection Industry standard Modbus

RTU protocol

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NHA12535

EM6430 Power Meters

Chapter 1 Product Description

EM6430 conforms to

Emission : CISPR22 Class A; Fast Transient: 4kV IEC

61000-4-4; 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 s

IP degree of protection

Front display IP 51;

Meter body IP 40 Excluding terminals

NOTE: Universal CT range is applicable for Class 1 & Class 0.5 meters where CT secondary of
1 A or 5 A is field-programmable.
For Class 0.5S & Class 0.2 meters, CT secondary rating (1 A or 5 A) should be specified while ordering.

* Class 0.2 is applicable when the voltage (line-neutral) is above 120 V.

** Auxiliary voltage should not exceed 300 V AC/DC.
*** Additional error of 0.05% of full scale, for power meter input current below 100 mA for 5A
and below 20 mA for 1A.

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EM6430 Power Meters

Chapter 2 Safety Precautions

NHA12535

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.
RS 485 is safe to access up to 277 L-N / 480 L-L V only. If the voltage is above
277 L-N / 480 L-L V, then switch OFF the input voltage before handling the RS 485
terminal.
Failure to follow these instructions will result in death or serious injury

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NHA12535

EM6430 Power Meters

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 38. Here are
few tips.
Figure 3-1: Quick setup - connections

Use PT2

Use CT1

Use PT3
Use PT1

Use CT2

Control Power

Use CT3

3
1

RS-485

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EM6430 Power Meters

Chapter 3 Quick Start Guide

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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

10

11

4. RS 485 terminals

18

+ve

-ve

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NHA12535

EM6430 Power Meters

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
their current settings.

to scroll and view the setup parameters and

Enter Setup Menu in Edit Mode

NOTICE:
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.
NOTICE: 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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EM6430 Power Meters

Chapter 3 Quick Start Guide

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Setup Parameters in View and Edit Modes

NOTICE: *The Parameter Selection is user selectable. You can select only one energy
parameter at a time.

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EM6430 Power Meters

Edit Set Parameters

This example explains how to edit the value of A.PRI from 100.0 to 5000 in
PROG menu setup of the EM6430 power meter. Then it shows how to save
the value to the setup.
NOTICE: 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
times

Press

four

four times

NOTICE:
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
..
4. Press
5. Press

four times. The display shows EDIT A.PRI 500.0 with blinking
. The display shows EDIT A.PRI 5000. with blinking ..
to accept the new value.

To edit the next parameter, press

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and repeat the above steps.

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Save the New Value to Setup

NOTICE:
means blinking
y means blinking y

1. After you edit the parameter as described above, press

shows SAVE y with blinking y.

. The display

2. Press
or
to save the new value. The display flashes PASS and
then shows EDIT.
3. Press

to return to SET.

NOTICE: If you do not want to save the new value, press

to SAVE n in step 1. Then press
to step 3.

or

to change the value from SAVE y

. The display flashes FAIL and shows EDIT. Proceed

Edit ID

NOTICE:
means blinking
y means blinking y

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.

5. Press
for two seconds. The display shows CODE 2000 with 2 blinking.
The factory set CODE is 1000.
6. Press
7. Press

22

. The display shows CODE 1000 with 1 blinking.

once or

four times to accept the new CODE value.

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NHA12535

EM6430 Power Meters

The display shows PASS and then EDIT A.PRI 100.0 indicating the
successful entry to the setup menu in edit mode.
8. Press

until the display shows EDIT ID 1.000 page.

Press
to set the desired EDIT ID value. Press
page set with the new values.

to view the Edit ID

NOTICE: If you enter a wrong code, the display flashes FAIL and then displays EDIT. Repeat
the procedure and make sure that you enter correct code.

Energy Integrator
The EM6430 power meter is equipped with an energy integrator function. It
provides several parameters for Energy Management: VAh, Wh, VAh E,
Wh E etc.
NOTICE:
CT Reversal: Auto-correction for energy integration in star (wye) mode. In star (wye) mode
energy integration always is 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 EM6430 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.
By setting the Integrator reset parameter to WhE or VAhE, the time it takes
for the integrator to reset depends on the Power Ratio of the load. Below
table shows the Max. Reading under different load conditions:
Table 3-1: Integrator overflow for Wh E / VAh E
Power Ratio
(1.732 x V.PRI x A.PRI)

Max reading
(Wh E / VAh E)

Minimum time
( in months) to
overflow at full
scale

1 VA to 1000 VA

9999 K

13.88

1 kVA to 1000 kVA

9999 M

13.88

1 MVA to 1000 MVA

9999 G

13.88

> 1000 MVA

<1 year

Approx. overflow time in years =

Max reading
Power Ratio

24 30 12

Example: For a full scale of 200kVA constant load, the overflow duration can
be calculated as follows:
Max reading
Power Ratio

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9999 X 106
200 X 103

= 49995

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NHA12535

= 173.59 Months = (5.78 Years)

Selecting Wh or VAh as overflow parameters under the Setup menu,
normally Run Hours reaches the maximum value (9999) and all other
Integrators such as Wh, VAh, VARh, -VARH, On Hours and Interruptions
are reset together
Table 3-2: Integrator overflow for Wh / VAh
Power Ratio
(1.732 x V.PRI x A.PRI)

Max reading
(Wh / VAh)

Max time to
reset the
integrator in
Run Hours

Max time (in

months) to
overflow at full
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

<9999

<1 year

> 1000 MVA

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
overwritten, when the INTG is cleared next time.
The values of parameters Wh, Wh E, VAh, VAh E are stored in the OLD
register when the INTG is cleared.

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NHA12535

EM6430 Power Meters

Menu Hierarchy

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EM6430 Power Meters

NHA12535

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).
The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again.

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. Blondels 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).
The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again.

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

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EM6430 Power Meters

Consumption and Poor Power Factor

Consumption: Wh = 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
Function

Formula

3D Factory
setting

kVA3 D =

Arth

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Other
Names

W + VAR + D

Which one?
Best, all around

Where D = Distortion Power per IEEE 100

U,
Apparent,
Vector kVA

kVA Arth = kVA1 + kVA2 + kVA3

Arithmetic,
Scalar kVA

Good under
Low unbalance,
to match
simpler meters
without 3D
capability

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Chapter 5: Installation
Mechanical Installation
The EM6430 power meters are panel-mounted and have reliable, rearmounted 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
3.26

8.0
0.31

90.0
3.54

96.0
3.78

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EM6430 Power Meters

Chapter 5 Installation

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

Altitude

2000

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 EM6430 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.

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Mounting
The power meters are panel mountable.
Table 5-2: Mounting
Description

Specification

Panel cut-out

92 -0 mm (w) x 92
DIN 43700

Panel thickness

0.5 to 4.0 mm

Instrumental bezel dimension

Depth behind bezel
Mounting clamps screws

96 x 96 mm
83 mm
Two in numbers, Slotted

Terminal screws

Combination Phillips and slotted head

+0.5

+0.5
-0

mm(h) IEC 61554 and

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.

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EM6430 Series Power Meters

Chapter 5 Installation

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.
NOTICE: 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.

NOTICE
DAMAGE TO THE DEVICE
Use only the specified tool for tightening and loosening the screw
Do not over-torque the screw above the specified range

Failure to follow these instructions can result in equipment damage.

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)
NOTICE: If the torque is more than 1 N.m (8.85 lb-in), then it may damage the screw or the
screw head.

Loosening Torque: 1.2 N.m (10.62 lb-in)

Connecting Cable Recommendations
Table 5-3: Connecting cable
Wire size
Voltage
Circuit
Current
Circuit

Current
Rating
2

1.5 - 2.5 mm
(16 - 14 AWG)
2
1.5 - 2.5 mm
(16 - 14 AWG)

Insulation
Rating

Temperature
rating

> 0.1 A
> 7.5 A

> 600 VAC

> 75 C (167 F)

NOTICE: 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.

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Terminal connections using lugs

Terminal connection using U lugs
Lug type: Insulated sleeved U lugs
Cross-section: 1.5 - 2.5 mm2 (16 - 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. 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
Cross-section: 1.5 - 2.5 mm2 (16 - 14 AWG)
To connect the terminals using ring lugs, follow the steps explained below.

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.
NOTICE:

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.

To Disassemble the meter, refer to To Disassemble on page 57.

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Chapter 5 Installation

Auxiliary Supply (Control Power)

The EM6430 power meter requires a single-phase AC/DC
auxiliary (control) power supply to power up its internal
electronic circuitry. External 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.
surge

NOTICE: 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 , 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.
NOTICE: 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.

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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
NOTICE: 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

Auxiliary supply (Control

power)

44 to 300 VAC/DC

250mA, 600V AC, fastacting type

250mA, 300V AC/DC,
fast-acting type

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.
The wiring used for the current inputs should have an insulation rating
greater than 600 VAC. The cable connection should be rated for 7.5 A or
2
greater and have a cross-sectional area of 1.5 - 2.5 mm (16 - 14 AWG).

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Chapter 5 Installation

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
via 1.5 - 2.5 mm2 (16 - 14 AWG) cable.
Table 5-5: CT size and maximum distance
5 A CT size
2.5 VA
5.0 VA

Maximum Distance in metres (in feet/inch)

(CT to EM6430 power meter)
3.05 m (10 ft/120 in.)
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.
NOTICE:
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 phasewise W readings must be negative.

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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 38
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 39 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 40 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 40 for more information.

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Chapter 5 Installation

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

NOTICE:
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

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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

NOTICE: 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

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

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EM6430 Series Power Meters

Chapter 5 Installation

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

NOTICE: 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

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Chapter 6 Data Communication

Chapter 6: Data Communication

This section is applicable only for EM6430 power meters with RS 485
communication option.

Float Byte Register

Float Byte Characteristics:
Block wise access.
If Read and Write values are matching, then it means the float byte
sequence is in sync with the master.
The float byte number is fixed.
Table 6-1: Float Byte Test Sequence Register
Addr: 320-321
(2 registers)

Data Type

Description

Property

4030201.0

Float

Before starting the

communication, you
must write this number
and read.

Normal Read and Write.

NOTICE:

If any other write value is given as input other than the mentioned write value in the
above table, then the meter will give a data exception response.

If you do not want the default value, you can always set the desired values in the Edit
page.

Health Check Register

Health Check Register Characteristics:
Normal Read Only.
16bit UNIT.
Identifies the meter existence in the network.
Table 6-2: Health Check Register
Addr: 0304
(1 register)

Data Type

Description

Property

Model Type

UNIT16

To identify the meter

Normal Read.
presence in the network.

Float Byte Order Detection

Float Byte Order Detection Characteristics:
Normal Read Only.
16bit UNIT.
Identifies the float byte order in the meter.
Table 6-3: Float Byte Order Detection

Schneider Electric. All rights reserved.

Addr: 0306
(1 register)

Data Type

Description

Property

Model Type

UNIT16

To identify the float byte Normal Read.

order in the meter.

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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
Vijeo Citect, PowerLogic SCADA for pinpointing energy usage and waste.
It supports ION enterprise.
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

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Chapter 6 Data Communication

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

Advantage Reliable communications, tolerant to one break in the
cable.

Communication Capabilities
Table 6-4: RS 485 communication distances
Baud Rate
9600
19200

Maximum communication distances 1 to 32 devices

Meters
1200
900

NOTICE: Distances listed should be used as guide only and cannot be guaranteed for nonSchneider 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
EM6430 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.
See Table 6-4 on page 43, for the maximum daisy-chain
communications distances for 2-wire devices.
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EM6430 Power Meters

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The terminals voltage and current ratings are compliant with the
requirements of the EIA RS 485 communications standard.
NOTICE: 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 EM6430 power meter.
The mode of transmission is defined in the following which is compatible
with Modbus RTU Mode:
Table 6-5: Power meter communication and protocol settings
Power meter communication settings
Protocol

Modbus RTU

Data bits

Baud rate

19200 Baud, User set 4800 to 19200

Range: 4800, 9600, 19200
Normal use: 9600 Baud
Noisy, EMI, RFI, long data cable: 4800 Baud
Short cable (< 300 meters or 975 feet): 19200 Baud

Parity

Even

Device Address

Stop bit

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 48 for more information

Data type

32-bit float (real) :

All parameters.
Direct reading, little-endian float, big-endian float, no scaling
required 32-bit unsigned integer.
2 to 50 (optional) per power meter data block of 10 x 32 bit values
must be configured to suit the power meter.

No of Registers

NOTICE: The polling interval to poll the data from EM6430 power meter will depend on baud rate.
We recommend polling interval of one second at 9600 Baud rate.

Modbus Standard Device Identification

Addressing the Modbus standard device identification
You can use Modbus command 0x2B/0x0E on these device identification
parameters.
Table 6-6: Modbus standard device identification parameters
Object ID

Object Name

Format

Access

00
01

Manufacturer name
Product code

String
String

R
R

02

FW Version

String

NOTICE:

The Read device identification can be read as stream access and as individual access.

The product code is the same file name without version number.

44

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Chapter 6 Data Communication

Parameter Settings for Different SCADA Software

The following table explains how to read the parameter VA (See Individual
parameter address on page 48 for more information) in different Modbus
master software/PLCs.
Table 6-7: Parameter settings
SL. SCADA software
No
1 ION Enterprise

Start
Address
43901

Function
Code
Internally
configured
Internally
configured
Internally
configured
Nil

No. of
Register
2

43901

PowerLogic
SCADA
Vijeo Citect

Intouch

43901 F

Modscan
(Master)

3901

03
HOLDING
REGISTERS
03
Rosemount
Nil

MODTEST

43901

100

FloatRosemount
Real

CIMPLICITY

43901

03-HOLDING
REGISTERS

Floating point

Direct
conversion. The
array concept
can be used
here to poll all
the data in
single scan.
Direct

Allenbradly
Micrologix PLC
(Slave/Master)
GE Fanuc PLC

43901

03-HOLDING
REGISTERS
Index-3900 03- Read
HOLDING
REGISTERS

Real

Direct

Query
Range - 2

11 SIEMENS PLC
(Master)
12 MOVICON
13 RSVIEW

3900

MFI Analog Under sub

measured
parameters,
Floating value Sign and
Exponent in
First Register
should be
disabled
(Unchecked)
Real
Direct

2
2

Real
Real

Direct
Direct

14 ABB Microscada

3900

Interval 2 Real

Direct

10 ABB RTU 560

(Mater)

Schneider Electric. All rights reserved.

43901

43901

43901
43901

03-HOLDING
REGISTERS
Nil
03-HOLDING
REGISTERS
Format 9

2
2
2

Points -1

Data Type

Remarks

Swapped Float Direct

conversion
Real
Direct
conversion
Real
Direct
conversion
Float
Direct
conversion
Floating point Unswapped FP
mode

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Communication Test
Communication test: EM6430 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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Chapter 6 Data Communication

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.

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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Data Address
The EM6430 power meter supports the transfer of whole block and also of
individual data values (two registers are used for storing single data values).
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 6-8: Individual parameter address
Parameter

Description

Address

Type

EM
6430

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

PF3

Power factor, phase 3

3951

Float

3915

Float

Metering Frequency
F
Frequency, Hz

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Chapter 6 Data Communication

Parameter

Description

Address

Type

EM
6430

%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

Power Quality
THD

THD measurement range:

i. 0.5A to 6A measurement current, for 5A meter and universal 1A or 5A meter models
ii. 0.1A to 1.2A measurement current, for 1A meter models
iii. 50V to 600V line-to-line measurement voltage
iv. 45 to 65Hz measurement line frequency
NOTE: The EM64XX power meter may show current and voltage THD% as "----" on the meter
display and
"-999" through communications, under any of the following conditions:
1. When the current through the internal CT of the meter is:
i. 0.5A or 6A, for 5A meter and universal 1A or 5A meter models
ii. 0.1A or 1.2A, for 1A meter models
2. When the voltage at measurement terminals of meter is 50V or 600V
3. When the measurement line frequency is > 65 Hz
Energy
FwdVAh

Forward apparent energy

3959

Float

FwdWh

Forward active energy

3961

Float

FwdVARh

Forward reactive inductive energy

3963

Float

FwdVARh

Forward reactive capacitive energy

3965

Float

RevVAh

Reverse apparent energy

3967

Float

RevWh

Reverse active energy

3969

Float

RevVARh

Reverse reactive inductive Energy

3971

Float

RevVARh

Reverse reactive capacitive Energy

3973

Float

% 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 %Load

Unbalanced %load

3889

Float

3891

Float

Unbalanced % voltage Unbalanced % voltage

Block Parameter Address

Total RMS Block:
Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only
Table 6-9: Total RMS block

Schneider Electric. All rights reserved.

Parameter

Description

Address

Type

VA

Apparent power, total

3001

Float

EM
6436

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

Average current

3013

Float

Frequency, Hz

3015

Float

Reserved
Intr

Reserved
Number of interruption

3017
3019

Long
Long

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R phase RMS Block:

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

Table 6-10: R phase RMS block

Parameter

Description

Address

Type

VA1

Apparent power, phase1

3031

Float

EM
6436

W1

Active power, phase1

3033

Float

VAR1

Reactive power, phase1

3035

Float

PF1

Power factor, phase1

3037

Float

V12

Voltage phase1 to phase2

3039

Float

V1

Voltage phase1 to neutral

3041

Float

A1

Current, phase1

3043

Float

F1

Frequency, Hz

3045

Float

Reserved

Reserved

3047

Long

Intr1

Number of interruption

3049

Long

Y phase RMS Block:

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only
Table 6-11: Y phase RMS block
Parameter

Description

Address

Type

VA2

Apparent power, phase 2

3061

Float

EM
6436

W2

Active power, phase 2

3063

Float

VAR2
PF2

Reactive power, phase 2

Power factor, phase 2

3065
3067

Float
Float

V23
V2

Voltage phase 2 to phase 3

Voltage phase 2 to neutral

3069
3071

Float
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 6-12: B phase RMS block

50

Parameter

Description

Address

Type

VA3

Apparent power, phase 3

3091

Float

EM
6436

W3

Active power, phase 3

3093

Float

VAR3

Reactive power, phase 3

3095

Float

PF3

Power factor, phase 3

3097

Float

V31

Voltage phase 3 to phase 1

3099

Float

V3

Voltage phase 3 to neutral

3101

Float

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NHA12535

EM6430 Power Meters

Chapter 6 Data Communication

A3

Current, phase 3

3103

Float

F3

Frequency, Hz

3105

Float

Reserved

Reserved

3107

Long

Intr3

Number of interruption

3109

Long

Forward Integrated Block:

Function Code: 03H Read
Number of registers: 20
No scaling required
Read as block only
Table 6-13: Forward integrated block
Parameter

Description

Address

Type

FwdVAh

Forward apparent energy

3121

Float

EM
6436

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

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

OldFwdVAh

Old forward apparent energy

3122

Float

EM
6436

OldFwdWh

Old forward active energy

3124

Float

OldFwdVARh

Old forward reactive inductive energy

3126

Float

Reserved
Reserved
OldFwdVARh

Reserved
Reserved
Old forward reactive capacitive energy

3128
3130
3132

Float
Float
Float

Reserved
Reserved
Reserved
OldFwdRunsecs

Reserved
Reserved
Reserved
Old forward run seconds

3134
3136
3138
3140

Float
Float
Long
Long

Setup Block:
Function Code: 03H Read, 10H Write
Number of registers: 40/42
No scaling required
Read and write as block only
Table 6-15: Setup block

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EM6430 Power Meters

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52

NHA12535

Parameter

Description

Address

Type

Range

Default
value
100.0

EM6430

A.Pri

Current primary

0101

Float

1.0 to
99 k

A.Sec

0103

Float

V.Pri

Current
secondary
Voltage primary

1.0 to 6.5

5.000

0105

Float

100.0 to 999 k

415.0

Parameter

Description

Address

Type

Range

EM6430

Voltage
secondary

0107

Float

50.00 to 601.0

Default
value
415.0

V.Sec

SYS

System
Configuration

0109

Float

3.000

LABL

Phase Labeling

0111

Float

0.000

VA Fn

VA Function
selection

0113

Float

2.0 to 6.0
2.0 Delta
3.0 Star
4.0 Wye
5.0 2 Ph
6.0 1 Ph
0.0 to 4.0
0.0 123
1.0 ABC
2.0 RST
3.0 PQR
4.0 RYB
0.0 to1.0
1.0 3D
1.0 Arth

0.000

Reserved

Demand
Selection

0115

Float

0.0 to 1.0
0.0 Auto
1.0 User

0.000

Reserved

Demand
parameter

0117

Float

0.0
0.0
1.0
2.0

to 2.0
VA
W
A

0.000

Reserved

Demand period

0119

Float

1.0 to 6.0
1.0 5 Min
2.0
10 Min
3.0
15 Min
4.0
20 Min
5.0
25 Min
6.0
30 Min

3.000

BAUD

Baud rate

0121

Float

3.0 to 5.0
3.0 4800
4.0 9600
5.0 19200

5.000

PRTY

Parity and stop bit 0123

Float

0.000

ID
F.S%

Unit ID
% Full scale

0125
0127

Float
Float

0.0 to 5.0
0.0
Even 1
1.0
Even 2
2.0
Odd 1
3.0
Odd 2
4.0 No 1
5.0 No 2
1.0 to 247.0
1 to 100

1.000
100.0

OFLo

Overflow
parameter
selection

0129

Float

0.0 Wh
1.0 VAh
2.0 - Wh E
3.0 - VAh E

2.0 - Wh E

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NHA12535

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Chapter 6 Data Communication

Reserved

Number of poles 0131

for RPM

Float

Reserved
Parameter

Password
Description

0133
Address

Float
Type

1.0 to 8.0
1.0 2
2.0 4
3.0 6
4.0 8
5.0 10
6.0 12
7.0 14
8.0 16
1000
Range

2.000

1000
Default
value
2.0

EM6430

N
Reserved
O
PAR
T
I
C
Reserved
E
F.SEQ
:

Reserved

0135

Float

Power / Energy
Parameter
selection
Reserved
Float byte
sequences

0137

Float

1.0 VAh
2.0 - Wh

2.0

0139
0141

Float
Float

1.0 to 2.0
1.0 4321
2.0 2143

0.0
2.0

F
o
r efficient communication setup, read the setup parameters first and then edit the required
setup parameter value.

Clear Block:
Function Code: 10H Write
Number of registers: 2
No scaling required
Write as block only
Table 6-16: Clear block
Parameter

Description

Address

CLR_INTG_
SETDEFAULT

INTG clearing and setting 0311

up the setup default

Type

Range

Long

1 - INTG
256 - Setup
default

NOTICE:
For setup default, the power meter will send an exception for values other than 256.

Model Info Block:

Function Code: 03H Read
Number of registers: 14
No scaling required
Read as block only
Table 6-17: Model Info Block
Parameter
Reserved
Reserved
Model Version

Description
Reserved
Reserved
Model, Options and
version numbers

Address
0081
0083
0085

Type
Long
Long
Long

Reserved
Reserved
Reserved

Reserved
Reserved
Reserved

0087
0089
0091

Long
Long
Long

Reserved

Reserved

0093

Long

Range

Bits 30 to 24 for
model number;
Bits 23 to 16 for
options
Bits 15 to 0 for
version number
E.g., PM1200
model no is 22

Model Register Details

This section explains about the model register and helps you to understand

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EM6430 Power Meters

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the model number, version number, and options.

The following figure explains how the bits are organized in the model
register.

Figure 6-4: Bits in model register

MSB

LSB

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9

23 16
Options

30 24
Model No

5 4 3 2 1 0

15 0
Version No

Meter Model and Number: The following table bitwise explanation for
Meter model and number.
Table 6-18: Meter model and number
Meter Model

Model Number
5A Meter

Model Number
1A Meter

EM6430

27(0x1B)

155 (0x9B)

Option bit wise

Interpretation of firmware version number: The following steps clearly

explain how to interpret the firmware (FW) version number.
1. Convert the hexadecimal values both MSB and LSB into decimal values.
2. Apply the formula ((MSB*256) +LSB).
3. The resulting value will be 30400 for the hexadecimal value 0x76 0xC0.
4. Insert a 0 before the result and parse it from the right with two digits each.
5. The result will be the FW version = 03.05.02
Table 6-19: Firmware version interpretation
Hexadecimal

0x7726

Decimal

30502

NOTICE: Firmware version representation only. To determine your power meters present
firmware version, refer the diagnostic page in the power meter. To navigate through the
diagnostic page, see EM6430 power meters menu hierarchy on page 26.
NOTICE:
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

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Chapter 6 Data Communication

r Receiving
F Invalid function code
o Parity, framing or overrun error
O- Buffer overflow

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NHA12535

EM6430 Power Meters

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.

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EM6430 Power Meters

Chapter 7 Maintenance and Troubleshooting

NHA12535

Troubleshooting
The information in Table 71 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.

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
The data being displayed
is inaccurate or not what
you expect

Possible Cause
Incorrect setup values

Usage of protection class

(10P10 etc.) CTs/PTs

Improper wiring

Active Power (W) reading

is negative

CT may be reversed
Power may be in export
mode

58

Possible Solution
Check that the correct
values have been entered
for power meter setup
parameters (CT and PT
ratings, system type, and
so on). See PROG menu
- Setup on page 19 for
setup instructions.
Use instrument class 1 or
better CTs/PTs, which will
have better accuracy than
the protection class
CTs/PTs.
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 38 for more
information.
Check and correct the CT
connections.
1. Check the mode. If the
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.

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NHA12535

EM6430 Power Meters

Chapter 7 Maintenance and Troubleshooting

Potential Problem

Possible Cause

Possible Solution

The display went blank

suddenly

Over voltage/temperature

Interrupt the power supply

or reduce the voltage or
temperature within the
limit.
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.
Verify the power meter
communications
connections. See
Chapter 6 Data
Communication on page
41 for more information.

Fuse connection

The power meter stopped

communication abruptly

Communications lines are

improperly connected.

Over voltage/temperature

Incorrect Load bar

indication

Incorrect F.S% selection

The power meter is over

heated

Lack of sufficient air for

cooling

Interrupt the power supply

or reduce the voltage or
temperature within the
allowable limits.
Select the full scale load
percentage setting as per
your circuit.
Provide sufficient space all
around the power meter.
Separate the power meter
from other equipment for
cooling air.

Disposal and Recycle

Dispose of or recycle the device in accordance with the applicable laws and
regulations in your country.

To Disassemble
1. Ensure to shut down the device, before you begin to disassemble the
meter.
2. Disconnect all the connected terminals from the meter.
3. Loosen the mounting clamps at the back of the meter.
4. Remove the side clamps on both the sides of the meter by sliding
them forward.
5. Remove the meter from the panel-cutout carefully.
NOTICE: For the use of proper tool, refer Electrical Installation on page 32 for more
information.

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EM6430 Power Meters

Appendix A: Technical Data

NHA12535

Appendix A Technical Data

Accuracy
Table A-1: Accuracy
Measurement
Voltage LN per phase and
average
Voltage LL per phase and
average
Amp per phase and average
Amp, phase angle per phase
Frequency
Total Active power, (kW)
Total Reactive power,
(kVAR)
Total Apparent power, (kVA)
Active energy (kWh)
Import/Export
Reactive energy (kVARh)
(Inductive / Capacitive)
Apparent energy ( kVAh)
RPM

Accuracy % of Reading*
Class 1.0
1.0

Class 0.5S
0.5

Class 0.2
0.2

1.0

0.5

0.5

1.0
2
0.1
1.0
2.0

0.5
1
0.1
0.5
1.0

0.2
1
0.1
0.2
0.5

1.0

0.5

0.2

1.0

0.5

0.2

2.0

1.0

0.5

1.0
1.0

0.5
0.5

0.2
0.2

NOTICE:

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 %.
*In Delta mode configuration the accuracy will be 1.0% of reading.

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 at 240 V

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, and kVAh.
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 LEDs in the load bar start blinking when the load is greater

60

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EM6430 Power Meters

Appendix A: Technical Data

than 120%, to indicate overload.

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
Altitude 2000

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 29 for more information.

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EM6430 Power Meters

Appendix B: SIM(simulation) Mode

Appendix B: SIM (simulation) Mode

The EM6430 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

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, 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

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Appendix C: Glossary

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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 serial 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.
Firmware: Operating system within the power meter.
Float: A 32-bit floating point value returned by a register (See Data
Address on page 48 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 48
for more information).
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. It is 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.
ULOC: Default display page unlock (See Default display (View) page on
page 12 for more information).
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.

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EM6430 Power Meters

Appendix C: Glossary

Abbreviations

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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

F.Seq

Float byte sequence

FW

Firmware

FWD

Forward

Hz

Hertz

ID

Identity

in.

Inch

INTG

Integrator

IP

Ingress protection

kVAh

Kilo volt-ampere hour

kWh

Kilo watt hour

LSB

Least significant bit

Min

Minimum

ms

Milliseconds

MSB

Most significant bit

O.F

Overflow

PF

Power factor

PT

Potential transformer

Rev

Reverse

SYS

System configuration

ULOC

Unlock

Unb

Unbalance

Voltage

VA

Apparent power

VAh

Apparent energy

V.PRI

Voltage primary winding

V.SEC

Voltage secondary winding

VT

Voltage transformer

Active power

Wh

Active energy

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EM6430 Power Meters

Index

INDEX
AC Power Measurement
3D kVA Measurement, 28
Consumption and Poor PF, 28
AC Power Measurement
Three phase systems, 27
Auto scroll
Within page group, column of pages and
TURBO pages, 12
Block parameter address
B Phase RMS block, 50
Clear block, 53
Forward Integrated block, Reverse Integrated
block, 51
Model Info block, 53
Total RMS block, R phase RMS block, 49
Y Phase RMS block, 50
Communication Test, 46
Connections
Connection diagram symbols, 38
Delta connection, 39
Fuse recommendations, 35
Open delta connection, 39
Data Address
Block parameter address, 49
Individual parameter address, 48
Data communication, 41
Daisy chaining devices to the power meter, 43
Data Communication
Data formats and settings, 44
Default display (View) page
Display lock and unlock, 12
Disassemble, 57
Disposal and Recycle, 57

66

Electrical Installation, 32
Energy Integrator
Integrator overflow, OLD data register, 25
Front panel
Kilo, Mega, Giga and negative indicators, 9
Front Panel
LED display, Load bar, 8
Keys
Left, Right, Up, Down keys, 10
Operation, 11
Maintenance And Troubleshooting, 55
Mechanical Installation
Panel considerations and Environment, 30
Mechanical Installation, 29
Parameters with EM3460 series power meters,
14
EM6430 power meters product description, 7
PROG menu - Setup
List of setup parameters in View & Edit modes,
22
Quick setup - While powering on, 19
Setup entru in View mode, 21
Setup entry in Edit mode, 21
Setup parameters editing, 23
Rear Panel, 13
Safety
Precautions, 17
Symbols, 3
SIM (simulation) Mode, 61
Technical specifications, 15
Total RMS block, 49
TURBO Key, 10

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Schneider Electric India Pvt Ltd

44 P, Electronics City, East Phase,
Hosur Road,
Bangalore - 560 100, India
email :customercare.in@schneider-electric.com
Toll free help desk number:
1800 425 4272, 1800 103 0011
www.schneider-electric.co.in

Conzerv, PowerLogic, and ION Enterprise are either trademarks or registered

trademarks of Schneider Electric.
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.

NHA12535-03 2015 Schneider Electric. All Rights Reserved 07/2015