Tyco Integra Ci1 User manual

Energy Division
Installation and Operating Instructions
Integra Ci1

Crompton Instruments
The following symbols may appear in this user guide, and may also be affixed to the products
discussed in this guide:
Symbol Description
Earth terminal
Protective conductor terminal
Caution, Risk of electric shock
Caution, Refer to accompanying text
2 Integra Ci1 User Manual Issue 2 April 2010

Contents
1Introduction 5
1.1 Unit Characteristics..................................................................5
1.2 Current Transformer Primary Current......................................5
1.3 RS485 Serial Option Modbus™ or JC N2Protocol...................5
1.4 Pulse Output Option.................................................................5
2Start Up Screens 6
3Measurement Mode 6
4Setting-Up 7
4.1 Setup Entry Methods ...............................................................8
4.1.1 Menu Option Selection.......................................................8
4.1.2 Number Entry Procedure ...................................................8
4.2 Change Password....................................................................9
4.3 Supply System.........................................................................9
4.4 CT..........................................................................................10
4.5 Reset......................................................................................10
4.6 Communications....................................................................11
4.7 Relay Pulse Output................................................................13
4.8 Energy Units and 1% Limit.....................................................15
4.9 Test........................................................................................16
4.10 Version Information................................................................18
5Specification 19
5.1 Measurement Inputs ..............................................................19
5.1.1 Range of Use...................................................................19
5.2 Accuracy................................................................................19
5.3 Auxiliary Supply .....................................................................19
5.4 Option Modules......................................................................20
5.4.1 Pulse Relay Outputs ........................................................20
5.4.2 RS485 Output for Modbus™ or JC N2 Protocol .............20
5.5 Reference Conditions of Influence Quantities........................20
5.6 Environment...........................................................................21
5.7 Mechanics..............................................................................21
5.8 Approval, Certification, and Standards Compliance...............21
6Maintenance 22
7Installation 22
7.1 Safety.....................................................................................22
7.2 EMC Installation Requirements .............................................23
7.3 Case Dimensions and Panel Cut-Out....................................24

Crompton Instruments
7.4 Wiring.....................................................................................25
7.5 Additional considerations for three wire systems...................25
7.6 Auxiliary Supply......................................................................25
7.7 Fusing.....................................................................................25
7.8 Earth/Ground Connections.....................................................25
7.9 Connection Diagrams.............................................................26
7.10 RS485 and Modbus™ or JC N2 Protocol...............................27
7.11 Operation Check ....................................................................27
8Glossary 28
9Index 29
Important safety information is contained in the Maintenance section.
Familiarise yourself with this information before attempting installation
or servicin
g
of the unit.
4 Integra Ci1 User Manual Issue 2 April 2010

Crompton Instruments 1.Introduction 1.1.Unit Characteristics
1 Introduction
This document provides operating, maintenance and installation instructions for the Crompton
Instruments Integra Ci1 energy meter. The unit displays imported or exported real and reactive
energy, since it was last reset, in terms of Wh, kWh, MWh, VArh, kVArh and MVArh for single
phase, three-phase 3-wire or three-phase 4-wire supplies. In order to measure energy, the unit
requires voltage and current inputs in addition to the supply required to power the unit. The current
input(s) are obtained via current transformers (CTs).
The unit can be configured to work with a wide range of CTs, giving the unit a wide range of
operation. Option modules can be fitted to provide pulse and RS485 Modbus™/JC N2 outputs.
Configuration is password-protected.
The unit can be powered from a separate auxiliary a.c. (or d.c.). Alternatively it can be powered
from the monitored supply where appropriate.
1.1 Unit Characteristics
•Active Energy (Wh, kWh or MWh)
•Reactive Energy (VArh, kVArh or MVArh)
The unit has password-protected set-up screens for:
•Changing password.
•CT primary current (1 to 9999A)
•Energy reading reset
•Pulse output duration and rate divisor (option)
•RS485 serial Modbus™ or JC N2 format (option)
Pulsed relay outputs, indicating energy, and an RS485 output are available as optional extras. The
RS485 output option allows remote monitoring from another display or a computer.
1.2 Current Transformer Primary Current
The unit can be configured to operate with CT primary current of between 1 and 9999A. Maximum
CT primary current corresponds to a maximum input current to the unit of 5A.
1.3 RS485 Serial Option Modbus™ or JC N2Protocol
This option uses an RS485 serial port with Modbus™ or Johnson Controls (JC) N2 protocol to
provide a means of remotely monitoring and controlling the Ci1 unit. Both protocols are supported
in the same unit. Full instructions for RS485 port can be found in Section 4.6.
1.4 Pulse Output Option
This option provides one or two relay pulse outputs that clock up measured active (Wh) or reactive
(VArh) energy. The unit can produce one pulse for preset quantity of energy imported or exported.
Pulse rate divisor and width are configured from the Set-up menu, as detailed in Section 4.7.
Integra Ci1 User Manual Issue 2 April 2010 5

2.Start Up Screens Crompton Instruments
2 Start Up Screens
The first screen lights all LED segments and can be used as a
display LED check.
The second screen indicates the firmware installed in the display
unit. This example shows a version number of 10.06.
Next the unit performs a self-test and the screen indicates if the test
is passed.
After a short delay, the default measurement screen appears.
3 Measurement Mode
In measurement mode, the buttons control the displayed measurement as follows:
Displays the maximum current that can be monitored. This
reading is set on installation according to the current
transformer in use. The small ‘A’ on the bottom line indicates
that the display is showing Amperes.
Displays active energy measured since the unit was last reset.
The display alternates between Imported and Exported energy
each time the button is pressed. The bottom line of the display
shows the import/export mode and the Wh, kWh or MWh range.
The and/or symbol on the top line flashes each time
an output pulse is generated.
Displays reactive energy measured since the unit was last
reset. The display alternates between Imported and Exported
reactive energy each time the button is pressed. The bottom
line of the display shows the import/export mode and the VArh,
kVArh or MVArh range. The and/or symbol on the
top line flashes each time an output pulse is generated.
This display indicates the phase sequences of the measured
voltages and currents, allowing a check that they are connected
correctly. The sequence can be 123 or 132 but voltage (V) and
current (I) sequences must be the same. A ‘V1--‘ or ‘I --‘
display indicates a phase error of voltage or current,
respectively.
The top line of the display indicates the type of supply being monitored:
Single phase 3-phase 3-wire 3-phase plus N (4-wire)
The blue man flashes to indicate that energy for the currently displayed parameter is being
accumulated.
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Crompton Instruments 4.Setting-Up
4 Setting-Up
To enter set-up mode, firmly press the and buttons simultaneously and hold for about
5 seconds until the password screen appears. Setting-up is password-protected so
you must enter the correct password (default ‘0000’) before proceeding. If an incorrect password
is entered, the display reverts to measurement mode.
To exit setting-up mode, press repeatedly until the measurement screen is restored or hold
and buttons simultaneously for 5 seconds.
Setup Menu Structure
Change password
nnnn 4-digit number – default ‘0000’
Supply system
3-phase 4-wire
3-phase 3-wire
single phase
CT Set maximum current that can be monitored according to CT in use.
nnnn – 4-digit number 0001 to 9999.
Reset Resets cumulative energy measurement to zero.
Communication parameters for RS485 interface
Modbus™ protocol
Baud rate 2400/4800/9600/19200/38400
Parity none/odd/even
Stop bits 1 (1 or 2 if parity is None)
RS485 network address nnn – 3-digit number 1 to 247
Order –Norm/Rev Indicates if Modbus™ word order is normal or reversed.
Johnson Controls (JC) N2 protocol
RS485 network address nnn – 3-digit number 1 to 255
Relay pulse outputs
OP1 kWh/kVArh (Active/reactive) Import or Export from output module 1
OP2 kWh/kVArh (Active/reactive) Import or Export from output module 2
Rate 0.001/0.01/0.1/1/10/100/1000/10,000 kWh or kVArh per pulse
Pulse width 200/100/60 ms.
Energy
Unit/kilo/Mega
1% limit on/off
Test Phase sequence (V123 I123)
Display on – all elements on to check display
dISTG Display toggle – Each element is turned on and off alternately.
SFS Build number
SFH Firmware version
Integra Ci1 User Manual Issue 2 April 2010 7

4.Setting-Up 4.1.Setup Entry Methods Crompton Instruments
4.1 Setup Entry Methods
Some menu items, such as password and CT, require a four-digit number entry while others, such
as supply system, require selection from a number of options.
4.1.1 Menu Option Selection
1. Use the (up) and (down) keys to select the required item from the menu shown in
Section 0. Selection does not roll over from bottom to top of list or vice versa.
2. Press (enter) key to confirm your selection.
3. If an item flashes (shown red on these pages), then it can be adjusted by the and
keys. If not, there may be a further layer, e.g. Comms - Baud rate, before adjustment is
possible. Press to select the lower layer.
4. Having selected an option from the current layer, press to confirm your selection. The
SET indicator will come on.
5. Having completed a parameter setting, press (back) to return to a higher menu level.
The SET indicator will extinguish and you can then use the and keys for further
menu selection.
6. On completion of all setting-up, repeatedly press to return to the measurement screen.
4.1.2 Number Entry Procedure
When setting-up the unit, some screens require the entering of a number. In particular, on entry to
the setting-up section, a password must be entered. Digits are set individually, from left to right.
The procedure is as follows:
1. The current digit to be set flashes (shown red on these pages) and is set using the
and keys.
2. Press to confirm each digit setting. The SET indicator comes on to confirm successful
entry after the last digit has been set.
3. After setting the last digit, press to exit the number setting routine. The SET indicator
will extinguish.
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Crompton Instruments 4.Setting-Up 4.2.Change Password
4.2 Change Password
1. Use and to choose the Change Password option.
2. Press to enter the change password routine. The New
Password screen will appear with the first digit flashing.
3. Use and to set the first digit and press to confirm
your selection. The next digit will flash.
4. Repeat the procedure for the remaining three digits.
5. After setting the last digit, the SET indicator will light.
6. Press to exit the number setting routine and return to the Set-
Up menu. The SET indicator will extinguish.
4.3 Supply System
Use this section to set the type of power supply being monitored.
1. From the Set-up menu, use the and keys to select the
System option. The screen will show the currently selected supply
option.
2. Press to enter the Supply Selection routine.
3. Use the and keys to select the required system option:
3-phase 4-wire 3-phase 3-wire single phase
4. Press to confirm your selection. SET indicator will appear.
5. Press to exit the system selection routine and return to the
menu. The SET indicator will extinguish and you will be returned to
the main Set-Up menu.
Integra Ci1 User Manual Issue 2 April 2010 9

4.Setting-Up 4.4.CT Crompton Instruments
4.4 CT
The CT option sets the maximum primary current of the current transformer (CT) that will give 5A
into the meter (the maximum).
1. From the Set-up menu, use the and keys to select the
CT option. The screen will show the current CT primary current
value. An ‘A’ on the bottom line indicates that the reading is in
Amperes.
2. Press to enter the CT routine. The first digit will flash.
3. Use the method described in Section 4.1.2 to set the 4-digit number to the maximum CT
primary current, e.g. 500A.
4. On completion of the entry procedure, press to return to the
main Set-up menu.
4.5 Reset
Use this option to restart energy measurements (kWh, kVArh) from zero.
1. From the main Setup menu, use the and keys to
display the Reset screen.
2. Press . ‘hour’ will flash.
3. To reset the energy readings, press . SET will be
displayed and ‘hour’ will stop flashing.
4. Press to exit the Reset routine. SET will extinguish and
you will be returned to the main Set-up menu.
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Crompton Instruments 4.Setting-Up 4.6.Communications
4.6 Communications
The RS485 port can be used for communications using either Modbus™ or Johnson Controls (JC)
N2 protocol. For Modbus™, parameters such as Baud rate are selected from the front panel
whereas for JC N2 they are fixed. The RS485 address can be selected for both protocols.
The first section allows you to select either Modbus™ or JC N2 configuration.
1. From the main Setup menu, use the and keys to
display the Communications screen.
2. Press . The Format screen will appear showing the
current format – ModB or N2.
3. To change the format, press . The format will flash.
4. Use the or key to change the format.
5. Press to confirm your selection. SET will be displayed.
6. Press to exit the format selection routine. The SET
indicator will extinguish.
If you have selected N2 format, you can use the or key to select the RS485
address option and set it as detailed on page 13.
If you have selected ModB format, set the serial parameters as follows:
7. Use the or key to cycle through the Baud, parity,
stop bits and address menu options.
Baud Rate (not applicable for JC N2)
8.
To change the Baud setting, ensure that the display shows the
Baud setting and press to enter the Baud setting routine.
The setting digits will flash.
9. Use the and keys to select the desired Baud rate
from the available options 9600, 4800, 2400, 38.4k (38400)
and 19.2k (19200).
10. Press to confirm your Baud rate selection. SET will be
displayed.
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4.Setting-Up 4.6.Communications Crompton Instruments
11. Press to exit Baud setting routine. The SET indicator
will extinguish and the and keys can be used to
select a different Comms parameter.
Parity (not applicable for JC N2)
Note that if parity is set to Odd or Even, Stop Bits will be set to 1 and cannot be changed.
12. Use the and keys to select the Parity option.
13. Press to enter the parity setting routine. The parameter
will flash.
14. Use the and keys to select the desired parity
option from None, Even and Odd.
15. Press to confirm your selection. SET will be displayed.
16. Press to exit parity setting routine. The SET indicator
will extinguish and the and keys can be used to
select a different Comms parameter.
Stop Bits(not applicable for JC N2)
Note that, if Parity is set to Odd or Even, Stop Bits will be set to 1 and cannot be changed.
17. Use the and keys to select the Stop Bits option.
18. Press to enter the Stop Bits setting routine. The
parameter value will flash.
19. Use the and keys to select the desired Stop Bits
option 1 or 2.
20. Press to confirm your selection. SET will be displayed.
21. Press to exit Stop Bits setting routine. The SET
indicator will extinguish and the and keys can be
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Crompton Instruments 4.Setting-Up 4.7.Relay Pulse Output
used to select a different Comms parameter.
RS485 Address
An RS485 network can accommodate 255 different devices, each identified by an address
between 1 and 247 (Modbus™) or 1 and 255 (JC N2).
22. Use the and keys to select the Address option.
23. Press to enter the Address setting routine. The first digit
will flash.
24. Use the method described in Section 4.1.2 to set the 3-digit
address to the required number between 1 and 247 for
Modbus™ or 1 and 255 for JC N2.
Modbus™ Word Order (not applicable for JC N2)
This screen shows the word order (Hi/Lo) of the 8-bit bytes in the
Modbus™ message format. Normal is Hi first. This setting cannot be
changed from the front panel. (Not applicable for JC N2 format.)
4.7 Relay Pulse Output
This option allows you to configure one or two optional pulse outputs from the unit. Each output
can be set to provide a pulse for a defined amount of energy imported or exported. The energy
monitored can be active or reactive and the pulse width can be select as 200, 100 or 60 ms. The
defined energy per pulse will be the same for both outputs.
Maximum output pulse rate is two pulses per second, and the system prohibits setting of an
energy-per-pulse that will give a pulse rate greater than this. For example, on a single-phase, two-
wire system, a CT setting of 900A with a maximum 289V supply implies a maximum energy
imported or exported in an hour of 900 x 289 = 260 kWh which is 72 W.seconds. A setting of
10Wh per pulse would generate 7 pulses per second. Since this exceeds 2/s, the unit would not
allow such a setting.
Use this section to set up the relay pulse output(s) –
Output 1 off, import kWh, export kWh, import kVArh, export kVArh
Output 2 off, import kWh, export kWh, import kVArh, export kVArh
Rate (for both) 0.001/0.01/0.01/0.1/1/10/100/1000/10,000 kilo/pulse
Pulse width 200/100/60 ms.
1. From the main Setup menu, use the and keys to display
the Relay screen.
2. Press . The Output 1 screen will appear.
From here, the and keys can be used to select menus for Output 1, Output 2, Rate
and Pulse Width .
Integra Ci1 User Manual Issue 2 April 2010 13

4.Setting-Up 4.7.Relay Pulse Output Crompton Instruments
Output 1
3. Use the and keys to select the Output 1 screen.
4. Press to enter the Output 1 setting routine. The screen will
show the current setting for Output 1 flashing.
5. Use the and keys to select the required option for Output
1: none or import/export and units.
6. Press to confirm your selection. The SET indicator will appear.
7. Press to exit Output 1 setting routine. The SET indicator will
extinguish and the and keys can now be used to select a
different Relay parameter.
Output 2
This is the next item on the Relays menu and the method of setting is
exactly the same as for Output 1
Rate
Use this to set the energy represented by each pulse from either output.
8. Use the and keys to select the Rate screen.
9. Press to enter the Rate setting routine. The Rate value will
flash. The Rate is the energy that each output pulse represents.
10. Use the and keys to select the Rate required for the
pulse output(s).
11. Press to confirm your selection. The SET indicator will appear
and the display will stop flashing.
12. Press to exit Rate setting routine. The SET indicator will
extinguish and the and keys can be used to select a
different Relay parameter.
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Crompton Instruments 4.Setting-Up 4.8.Energy Units and 1% Limit
Pulse Duration
Use this option to set the duration of pulses (in ms) from both outputs.
13. Use the (up) and (down) keys to select the Pulse screen.
14. Press to enter the Pulse Width setting routine. The value will
flash.
15. Use the (up) and (down) keys to select the Pulse Width
in ms.
16. Press to confirm your selection. The SET indicator will appear
and the display will stop flashing.
17. Press to exit Pulse Width setting routine. The SET indicator
will extinguish and the and keys can be used to select a
different Relay parameter.
4.8 Energy Units and 1% Limit
Use this option to set the displayed units multiplier and to set a 1% limit on measured energy on or
off.
The unit multiplier for all displays can be set to Wh/VArh (x1), kWh/kVArh (kilo) or MWh/MVArh
(Mega).
To prevent noise from being recorded and causing ‘meter creep’, a 1% limit can be imposed on the
measured input such that readings less than 1% of maximum are not recorded. This limit can be
turned off so that even small energy increments are recorded.
1. Use the and keys to select the Energy screen.
2. Press to select the Energy menu.
At this stage, you can use the and keys to select either the Energy Units or 1%
Limit menu.
Energy Units
3. With the Unit screen selected, press to enter the Units
setting routine. The currently selected unit flashes.
4. Use the and keys to select the required units.
Integra Ci1 User Manual Issue 2 April 2010 15

4.Setting-Up 4.9.Test Crompton Instruments
5. Press to confirm your selection. The SET indicator will
appear and the display will stop flashing.
6. Press to exit Units setting routine. The SET indicator will
extinguish.
1% Limit
7. Use the and keys to select the Limit screen.
8. Press to enter the Limit setting routine. The value will flash.
9. Use the and keys to turn the 1% limit on or off. With
Limit On, line noise below 1% of the maximum range will not be
recorded.
10. Press to confirm your selection. The SET indicator will
appear and the display will stop flashing.
11. Press to exit 1% Limit setting routine. The SET indicator
will extinguish.
12. Press again to exit the Limit menu and return to the main
Setup menu.
4.9 Test
This option provides various test facilities.
1. Use the and keys to select the Test screen.
2. Press to enter the Test menu.
3. Use the and keys to select the required test option and press to
confirm your selection. The available options are:
Lights all LED segments so that display
segments can be checked.
Toggles display segments alternately.
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Crompton Instruments 4.Setting-Up 4.9.Test
Shows the voltage and current phase
sequences.
4. Press to exit the selected test display mode.
5. Press again to return to the main Setup menu.
The voltage and current inputs must be greater than 5% of nominal for the test to operate reliably.
Voltage and current phase displays show the phase relationships of the inputs. To obtain the
correct power readings, the phase sequences can be either ‘123’ or ‘132’ but must be the same for
both current and voltage.
To obtain phase indications, the measured phase relationships must be within the following
parameters. If, for instance, a current transformer were to be reverse connected, the phase of the
measured current for that phase would be out be 180° out and the display would indicate a current
phase error.
Three-phase four-wire mode
Measurements are referenced from L1.
Voltage:
For the voltage sequence test, the phase of L2 relative to L1 must be within the window
240° ± 48° and L3 relative to L1 must be within the window 120° ± 48° to record the sequence
V123.
Alternatively, the phase of L2 relative to L1 must be within the window 120° ± 48° and L3
relative to L1 must be within the window 240° ± 48° to record the sequence V132.
The display shows ‘V1--‘ if a voltage phase is outside these parameters.
Current:
For the current sequence test, the phase of I1 relative to L1 must be within the window
0° ± 48°, I2 relative to L1 must be within the window 240° ±°48°, and I3 relative to L1 must be
within the window 120° ± 48° to record the sequence i123.
Alternatively the phase of I1 relative to L1 must be within the window 0° ± 48°, I2 relative to L1
must be within the window 120° ± 48°, and I3 relative to L1 must be within the window
240° ± 48° to record the sequence i132.
The display shows ‘I --‘ if a current phase is outside these parameters.
Three-phase three-wire mode
Measurements are referenced from L1-L2.
Voltage:
For the voltage sequence test, the phase of L2-L3 relative to L1-L2 must be within the window
240° ± 48° and L3-L1 relative to L1-L2 must be within the window 120° ± 48° to record the
sequence V123.
Alternatively, the phase of L2-L3 relative to L1-L2 must be within the window 120° ± 48° and L3
relative to L1-L2 must be within the window 240° ± 48° to record the sequence V132.
The display shows ‘V1--‘ if a voltage phase is outside these parameters.
Current:
Integra Ci1 User Manual Issue 2 April 2010 17

4.Setting-Up 4.10.Version Information Crompton Instruments
For the current sequence test, the phase of I1 relative to L1-L2 must be within the window
330° ± 48°, I2 relative to L1-L2 must be within the window 210° ± 48°, and I3 relative to L1-L2
must be within the window 90° ± 48° to record the sequence i123.
Alternatively, the phase of I1 relative to L1-L2 must be within the window 330° ± 48°, I2 relative
to L1-L2 must be within the window 90° ± 48°, and I3 relative to L1-L2 must be within the
window 210° ± 48° to record the sequence i132.
The display shows ‘I --‘ if a current phase is outside these parameters.
4.10 Version Information
The last two options of the Set-up menu show the versions of firmware and hardware of the unit.
Shows build number, e.g. 18.000
Shows firmware version, e.g. 1.020.
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Crompton Instruments 5.Specification
5 Specification
5.1 Measurement Inputs.
3-Phase 4-Wire, 3-Phase 3-Wire and Single-Phase 2-Wire Unbalanced.
Direct measurement of 173 to 500Vac L-L, (100 to 289Vac L-N).
Line frequency measured from L1 voltage or L3 voltage.
Three current inputs (six physical terminals) for connection of external CTs.
5.1.1 Range of Use
Values of measured quantities, components of measured quantities, and quantities which affect
measurement errors to some degree, for which the product gives meaningful readings.
Voltage 5 … 120% of Range Maximum (below 5% of Range Maximum voltage,
current indication may only be approximate)
Current 1 … 120% of nominal
Active power 1 … 144% of nominal, 360MW maximum
Apparent power 1 … 144% of nominal, 360MVA maximum
Power is only registered when voltage and current are within their respective range of use.
5.2 Accuracy
Active energy (Wh) Class 1 IEC 62053-21
Reactive energy (VARh) 1% of Range Maximum
Temperature co-efficient Active energy = 0·018%/°C, typical
Error change due to variation
of an influence quantity in the
manner described in Section 6
of IEC 688:1992
2 ×error allowed for the reference condition applied in the
test. Error due to temperature variation as above.
Error in measurement when a
measurand is within its
measuring range, but outside
its reference range
2 ×error allowed at the end of the reference range adjacent
to the section of the measuring range, where the
measurand is currently operating / being tested.
5.3 Auxiliary Supply
The unit can be powered from an auxiliary a.c. or d.c. supply that is separate from the metered
supply. Two-way fixed connector with 2·5mm2stranded wire capacity.
110 to 400V a.c. 50/60Hz ±10% or 120V to 350V d.c. ±20%. Consumption < 5VA.
Integra Ci1 User Manual Issue 2 April 2010 19

5.Specification 5.4.Option Modules Crompton Instruments
5.4 Option Modules
Two option modules can be fitted which can be of two types: a single RS485 (Modbus™ / JC N2)
or single pulse relay output. A fully populated product can support one RS-485 channel and one
pulse relay output or two pulse relay outputs.
5.4.1 Pulse Relay Outputs
These outputs can be configured from the Set-up menu.
Each of the two possible outputs can be set to generate pulses representing imported kWh,
exported kWh, imported kVArh, or exported kVArh.
Rate can be set to generate 1 pulse per
0.001 = 1 Wh/VArh
0.01 = 10 Wh/VArh
0.1 = 100 Wh/VArh
1 = 1 kWh/kVArh
10 = 10 kWh/kVArh
100 = 100 kWh/kVArh
1000 = 1 MWh/MVArh
10000 = 10 MWh/MVArh
The rate cannot be set to a value that could result in more than 2 pulses/second.
Pulse width 200/100/60 ms.
5.4.2 RS485 Output for Modbus™ or JC N2 Protocol
For Modbus™, the following RS485 communication parameters can be configured from the Set-up
menu. Baud rate 2400, 4800, 9600, 19200, 38400
Parity none/odd/even
Stop bits 1 or 2
RS485 network address nnn – 3-digit number 1 to 247
Modbus™ Word order – Hi/Lo byte order is set automatically to normal or reverse.
Only 1 stop bit can be set if odd or even parity is required.
For JC N2, only the RS485 network address can be configured. The range of addresses is 1-255.
5.5 Reference Conditions of Influence Quantities
Influence Quantities are variables that affect measurement errors to a minor degree. Accuracy is
verified under nominal value (within the specified tolerance) of these conditions.
Ambient temperature 23°C ±1°C
Input waveform 50 or 60Hz ±2%
Input waveform Sinusoidal (distortion factor < 0·005)
Auxiliary supply voltage Nominal ±1%
Auxiliary supply frequency Nominal ±1%
Auxiliary supply waveform (if AC) Sinusoidal (distortion factor < 0·05)
Magnetic field of external origin Terrestrial flux
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