EM737 CT
METERSUK
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User Manual
Smart Energy Meter
KEY FEATURES
Three phase metering
• Standard DIN rail Format (DIN43880)
• EN50470-3 Class B.
• Import & Export active energy / Import & Export reactive energy
• Instant Volt, Amp, Power factor, Frequency, Active power,
Reactive power, Apparent power
• Isolate pulse output and IR (DIN43864)
• LCD display, 6 integer 2 decimal
• Large clear backlight display
• Internal transformer
• 27 CT rate can be selected
• Optional single-phase model
• RS485 communication port, modbus protocol, IR port
• Program by button on the nameplate
• Memory back-up (EEprom)
• 7 DIN modules
• MID approval
• The meter is intended to be installed in a Mechanical Environment ‘M1’, with Shock and Vibrations of low significance, as per
2004/22/EC Directive and should be installed in Electromagnetic Environment ‘E2’, as per 2004/22/EC Directive.
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INDEX
1. Safety notice
2. Package Contents
3. EC Type Examination Certificate - upon request
4. Declaration of Conformity - upon request
5. Technical description
5.1 Performance criteria
5.2 Meter specification
5.3 Dimensions and sealing points
6. Wiring diagrams
7. Meter reading
8. Main function
8.1 Measuring Function
8.2 Display function
8.3 Electricity parameters measurement and monitoring
8.4 Communication Function
8.5 Alarm function
8.6 Pulse output function
9 Programming
9.1 Password verify
9.2 ID setting
9.3 Baud rate setting
9.4 CT rate setting
9.5 Password setting
10. Technical support
1. SAFETY NOTICE
The smart energy meter of EM737 series does not require
special mechanical or electrical tools for its installation.
Mounting position (with any angle of tilt) has no effect on the
measurement functions of the meter.
Connecting of the meter must be made according to applicable
wiring diagram. Incorrect connection of the meter to the
electricity network causes major display problem and can
also causes serious damage to the meter.
Before starting meter operation, it must be ensured the local
conditions of the energy system are consistent with data on the
nameplate of the meter.
Preferably use for the connection of shielded cables. Make sure
that connecting cables are not damaged during installation of
the meter are not energized and free of non-mechanical stress.
Repairs when removing the cover of the meter, which is also
under tension can be made only by a qualified electrician who
is familiar with the associated risks.
Capacitors in the meter may still be charged even if the meter
is disconnected from all energy sources.
2. PACKAGE CONTENTS
Three phase, electronic energy meter
instructions for assembly
ID setting
Baud rate setting
CT rate setting
Password setting
METERSUK
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EM737 CT
User Manual
5.2 METER SPECIFICATION
5. TECHNICAL DESCRIPTION
Operating humidity
Storage humidity
Limit range of operating temperature
Limit range for storage temperature
Humidity
International standard
Accuracy class
Protection against penetration of dust and water
Insulating encased meter protective class
Connection area main terminals (Indoor meter)
Current terminals flexible 1×mm²
another terminal flexible 1×mm²
5.1 PERFORMANCE CRITERIA
≤ 75%
≤ 95%
-25°C - +55°C(3K6)
-25°C - +55°C(1K4)
75% yearly average,95% on 30 days/year
EN50470-3 &IEC62053-21
Class B
IP51
0-16mm²
0-2.5mm²
Current Transformer
connected meters
Voltage 3 x 230/400v
Operational voltage 70% Un
Current (A)
- Lref 1.5A
- Ltr 0.15A
- Lmax 6A
- Lmin 0.075A
- Ist
3mA
< 0.01
General data
Frequency (Hz)
50
Memory back-up
EEprom
Terminal 960 C
Cover 650 C
upper
ABS+PC
lower
ABS+PC
Pulse output
Pulse width(ms)
80
Pulse constant(imp/kWh)
6400
LED constant
6400
Width x Height x Depth (mm)
126 x 104.5 x 60
Power consumption of current
circuits (VA)
< 0.01
Power consumption of voltage
circuits(W)
< 1.3W
Environment resistance to
heat and fire
EM737 CT
User Manual
6 WIRING DIAGRAMS
Note: the following types of wiring diagrams show the energy meter, include terminals for pulse output and the communication
interface RS-485.However,depending on the ordering number of the energy meter only some terminals of the energy meters
are involved.
1 & 2 L1 in & out
3 & 4 L2 in & out
5 & 6 L3 in & out
24, 21, 18 & 7 UL1,UL2,UL3,N
8 & 11 Active test pulse output contact (11−,8+)
9 & 11 Reactive test pulse output contact (11−,9+)
12 & 13 RS485 communication contact 0(13 TX/RX(-), 12 TX/RX(+))
7. METER READING
The Smart energy meter is equipped with 6 + 1 LCD display, which is
used for recording energy consumption and cannot be reset to zero.
The number system is based on units of 10 and each unit is
measured in kWh.
5.3 DIMENSIONS & SEALING POINTS
126
44
59
60
46
104.5
100
EM737 CT
User Manual
8. MAIN FUNCTION
On the EM737’S front panel, there are three LED, active/reactive energy pulse light, and alarm indicator lights .
Meter can measure import & export active energy , import & export reactive energy. The measurement type can be set.
Smart meter have two status: cycle display status and button press display . When pressing the button, User can set according
their request. Button press will Backlight the LCD. Display cycle can be set within 5~20 seconds, The default is 5 seconds.
The items are displayed as follows :
8.1 Measuring Function
8.2 Display function
No. Comments Read Write Bytes Starting Address
1 Voltage L1 Y N 4 10
2 Voltage L2 Y N 4 12
3 Voltage L3 Y N 4 14
4 Current L1 Y N 4 0016/0050
5 Current L2 Y N 4 0018/0052
6 Current L3 Y N 4 001A/0054
7 Current N Y N 4 001C/0056
8 Total Current Y N 4 CC1E/0058
9 Active Power L1 Y N 4 0020/0090
10 Active Power L2 Y N 4 0022/0092
11 Active Power L3 Y N 4 0024/0094
12 Total Active Power Y N 4 0026/0096
13 Reactive Power L1 Y N 4 0028/0110
14 Reactive Power L2 Y N 4 002A/0112
15 Reactive Power L3 Y N 4 002C/0114
16 Total Reactive Power Y N 4 002E/0116
17 Apparent Power L1 Y N 4 0030/00D0
18 Apparent Power L2 Y N 4 0032/00D2
19 Apparent Power L3 Y N 4 0034/00D4
20 Total Apparent Power Y N 4 0036/00D6
21 Power Factor L1 Y N 4 0038/0150
22 Power Factor L2 Y N 4 003A/0152
23 Power Factor L3 Y N 4 003C/0154
24 Total Power Factor Y N 4 003E/0156
25 Frequency Y N 4 0040/004E
Instantaneous Values
Total Energy Accumulator
No. Comments Read Write Bytes Starting Address
26 Active Energy Net Y N 4 0700/0618
27 Active Energy Import Y N 4 0800/0160
28 Active Energy Export Y N 4 0900/0166
29 Reactive Energy Import Y N 4 0A00/0162
30 Reactive Energy Export Y N 4 0B00/0168
00
00
00
EM737 CT
User Manual
No. Comments Read Write Bytes Starting Address
31 Serial Number Y N 4 FF00
32 Manufacture Code Y N 4 FF02
33 Type Code Y N 2 FF04
34 Hardware Version Y N 2 FF05
35 Software Version Y N 2 FF06
Production Data and Identification
Settings
No. Comments Read Write Bytes Starting Address
36 Modbus id Y N 2 524
37 Baud Rate Y N 2 525
0
0
LCD Content
kWArh
Symbol
Description
kWh - Active Energy
kW - Active Power
kvarh - Reactive Energy
kvar - Reactive Power
kVA - Apparent Power
Total
∑
Unpermitted Programming
Communication Symbols
LCD Alarm Indicator
Measure record and display voltage, current, power and power factors. error is not more than ±1％.
Provide out of limit monitoring capability, Voltage, Current, Power factor can be setup the limit value and monitoring.
With an infrared COM and a RS485 COM. Its physical layers are independent with each other. One communication channel
will not be affected by the other one. The meter can realize data acquisition, broadcast time setting, read, program and manage
through hand-held terminals, data acquisition terminal, test equipments and computers.
Communication protocols fit Modbus RTU standard. RS485 circuit and energy meter internal circuit can realize electrical
isolation and failure protection of circuit.
RS485 communications transfer rates allow selected at 1200bps, 2400bps, 4800bps and 9600bps, default is 9600bps.
When the meter connect wire wrong example: current reverse, lost phase and reversed phase sequence, the meter will display,
the ALARM led will be on.
Smart meter is equipped with a pulse output which is fully separated from the inside circuit. That generates pulses in proportion
to the measured energy .include the testing pulse output of active energy and reactive energy.
8/ 11 Test pulse output contact (P+/P-)，9/ 11 Test pulse output contact (Q+/Q-)
8.3 ELECTRICITY PARAMETERS MEASUREMENT AND MONITORING
8.4 COMMUNICATION FUNCTION
8.5 ALARM FUNCTION
8.6 PULSE OUTPUT FUNCTION
EM737 CT
User Manual
Pulse Output Function
The test pulse output is a polarity dependant, passive transistor output requiring an external voltage source for correct operation.
For this external voltage source, the voltage (Ui) should be 5-27V DC, and the maximum input current (Imax) should be
27mA DC. To connect the impulse output, connect 5-27V DC to connector 8&9 (anode), and the signal wire (S) to connector 11
(cathode). The meter pulses is indicated on the front panel.
9 PROGRAMMING
By holding the keys “SET” pressed for at least 1 sec., starts menu programming mode.
LCD will show:
On the smart meter display will appear : PA followed by the currently memorized value .
“PA” means “Password”,”0000”means the 4 digits of the Password. we can use press “Page Down” button to decrease the
input value, and press “Page Up” to increase the input value ,press the “SET” button to switch the input Password digits, when the
Password is correct, the meter will enter “program status” and display the “ID” program interface.
Remarks:
Please remember well the Password, Password to default (0000).
After the Password authentication , the meter will display the “ID XX” setup interface. As the following picture ”Id 00” it means
the current ID address is 00 (the ID address is hex code)
9.1 PASSWORD VERIFY
9.2 ID SETTING
Press “Page Down” button to decrease the digits. press ”Page Up” to increase the digits，press “SET” button to save the setup,
the interface will switch to Baudrate setup interface automatically. Press “SET” button to enter next interface if you do not need to
change the baudrate.
we can use press “Page Down” button to decrease the input value, and press “Page Up” to increase the input value,
press the “SET” button to switch the input digits, when the baudrate is correct, the meter will enter “program status” and display
the “CT” program interface.
Remarks：
1. Default baudrate will be 9600bps
2. 1200/2400bps /4800bps/9600bps can be set
9.3 BAUD RATE SETTING
EM737 CT
User Manual
Press “Page down” and “page up” buttons to select the CT transformation ratio press “SET” button to save the setup.
the interface will enter Password setup.
Remarks：
1. If the meter is Direct connection type, it has no CT setup interface.
2. After the CT ratio setup, the energy consumption display will be reset to 0.
The meter will display the current password after enter the password setup interface, press the “SET” to change the password.
Use “page down” and “page up” button to input password as you want. After 30 seconds the meter will save the password you
changed.
Remarks:
1 Do not forget the password you setup.
2 Please press the button to check if every setup is correct after the program.
3 Password setup interface “-“ symbol will blink.
10. TECHNICAL SUPPORT
Any questions, please contact:
9.4 CT RATE SETTING
9.5 PASSWORD SETTING：
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