Eastron SDM72CT-M User manual

Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: [phone] 83698882 Fax: [phone]
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: [e-mail]
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 Measures kWh, kVArh, W, Var, VA, PF, Hz, V, A etc.
Bi-directional measurement IMP & EXP
Two pulse outputs
RS485 Modbus
Din rail mounting 35mm
1/5A CT connection
Better than Class 1/ B accuracy
SDM72CT-M
Three Phase Four Wire Energy Meter
User Manual V1.0
2018

Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: [phone] 83698882 Fax: [phone]
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: [e-mail]
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Introduction
The SDM72CT-M is digital three phase 4 wire energy meter with a white back-lighted LCD screen for perfect
reading. The unit measures and displays the characteristics of three phase four wires(3p4w) supply, including
voltage, frequency, current, power ,active and reactive energy, imported or exported. Energy is measured in terms
of kWh, kVArh. The requisite current input(s) are obtained via current transformers(CT).
This meter can be configured to work with a wide range of CTs, giving the unit a wide range of operation. Built-in
interfaces provides pulse and RS485 Modbus RTU outputs. Configuration is password protected
PART 1 Specification
General Specifications
Voltage AC (Un) 3x230(400)V
Voltage Range 80~120% Un
Base Current (Ib) 5A CT input
Max. Current (Imax) 120% of Ib AC
Mini Current (Imin) 5% of Ib AC
Starting current 0.4% of Ib
Power consumption <2W/10VA
Frequency 50/60Hz
AC voltage withstand 4KV for 1 minute
Impulse voltage withstand 6KV-1.2uS wavform
Overcurrent withstand 20Imax for 0.5s
Pulse output rate Configurable ( Pulse 1)
1000imp/kWh (Pulse 2)
Display LCD with backlit
Max. Reading 9999999kWh
Active energy Class 1 IEC62053-21
Class B EN50470-3
Unit Characteristics
The Unit can measure and display:
Line voltage of all phases
Frequency
Line Currents of all phases
Power and power factor
Active energy imported and exported
Reactive energy imported and exported

Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: [phone] 83698882 Fax: [phone]
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: [e-mail]
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Two pulse output indicates real-time energy measurement. An RS485 output allows remote monitoring from
another display or a computer.
Current Transformer Primary Current
The unit can be configured to operate with CT ratio between primary current and secondary current. The
secondary CT has two options: 1A/5A
RS485 Serial –Modbus RTU
This unit uses an RS485 serial port with Modbus RTU protocol to provide a means of remotely monitoring and
controlling the Unit
Set-up screens are provided for setting up the RS485 port.
Pulse output
The unit provides two pulse outputs. Both pulse outputs are passive type.
Pulse output 1 is configurable. The pulse output can be set with Modbus protocol:
0.01 kWh / imp
0.1 kWh / imp
1 kWh /imp
10 kWh / imp
100 kWh /imp
1000=1000 kWh/kVArh
Pulse width: 200/100(default)/60ms can set with Modbus protocol.
Pulse output 2 is non-configurable. It is fixed up with total kWh. The constant is 1000imp/kWh.
RS485 Output for Modbus RTU
For Modbus RTU, the following RS485 communication parameters can be configured from the Set-up menu:
Baud rate 1200,2400, 4800, 9600
Parity none (default)/odd/even
Stop bits 1 or 2
RS485 network address nnn – 3-digit number, 001 to 247
Modbus™ Word order Hi/Lo byte order is set automatically to normal or reverse. It cannot be configured
from the set-up menu.
Environment
Operating temperature -25℃to +55℃
Storage and transportation temperature -40℃to +70℃
Reference temperature 23℃±2℃
Relative humidity 0 to 95%, non-condensing
Altitude up to 2000m
Warm up time 10s
Installation category CAT III
Mechanical Environment M1
Electromagnetic environment E2

Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: [phone] 83698882 Fax: [phone]
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: [e-mail]
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Degree of pollution 2
Mechanics
Din rail dimensions 72x100x66 (WxHxD) DIN 43880
Mounting DIN rail 35mm
Sealing IP51 (indoor)
Material self-extinguishing UL94V-0
PART 2 Operation
Initialization Display
When it is powered on, the meter will initialize and do self-checking.
Full Screen
Software Version
Total active energy(kWh)
Total=Import+ Export
Max read: 9999999 kWh
Buttons function
There are two buttons on the front panel.
>Scroll the display for data checking.
>Changing option at Set-up mode
>Exit the Set-up mode

Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: [phone] 83698882 Fax: [phone]
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: [e-mail]
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Scroll display
>Set-up mode entry
>Confirmation
After initialization and self-checking program, the meter display the measured values. The default page is total
kWh. If the user wants to check other information, please press the scroll button on the front panel.
Total active energy(kWh)
Total=Import+ Export
import energy
export energy
Total reactive energy (kVArh)
Imp reactive energy
Exp reactive energy

Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: [phone] 83698882 Fax: [phone]
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: [e-mail]
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Voltage L1
Voltage L2
Voltage L3
Current L1
Current L2
Current L3
Total active power (W)
Active power L1

Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: [phone] 83698882 Fax: [phone]
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: [e-mail]
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Active power L2
Active power L3
Total reactive power (VAr)
Reactive power L1
Reactive power L2
Reactive power L3
Total apparent power ( VA)
Apparent power L1

Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: [phone] 83698882 Fax: [phone]
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: [e-mail]
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Apparent power L2
Apparent power L3
Total Power Factor
Power Factor L1
Power Factor L2
Power Factor L3
Frequency
CT ratio

Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: [phone] 83698882 Fax: [phone]
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: [e-mail]
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Pulse Constant
Modbus Address
Baud Rate
Parity
Set-up Mode
To get into Set-up Mode, the user need press the “Enter” button for 3 second.
Page
Display
Descriptions
1 Password
To get into Set-
up mode, it asks a password
confirmation. Default password: 1000
Use and to enter correct password.
The entering information is wrong. The operation fails.
2
Keep pressing for 3 second, the current selection
will flash, use and to change the Modbus
address. Options: 1~247

Eastron SDM72CT-M User Manual
Zhejiang Eastron Electronic Co.,Ltd. Tel: [phone] 83698882 Fax: [phone]
Address: No.1369 Chengnan Road, Jiaxing, Zhejiang, 314001, China. Web: www.eastron.com.cn Email: [e-mail]
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Keep press for 3s to confirm the selection.
3
Keep pressing for 3 second, the current selection
will flash, use and to change the Baud rate.
Options: 1.2k, 2.4k,4.8k,9.6k ( default )
Keep press for 3s to confirm the selection.
4
Keep pressing for 3 second, the current selection
will flash, use and
to change the Parity.
Options: EVEN,ODD,NONE ( default )
Keep press for 3s to confirm the selection.
5
Use to select the CT ratio option. Keep pressing
for 3 second, the current selection will flash, use
and
to enter the CT Ratio. The range is
from 0001 to 2000. For example, if using a 100A/5A
current transformer, you shall enter 0020.
Keep press for 3s to confirm the selection.
5-1
6
Use to select the Password option. Keep
pressing for 3 second, the current selection will
flash, use and
to enter the new
password. The range is from 0001 to 9999.
Keep press for 3s to confirm the selection.
6-1
Keep pressing button to exit the set-up mold.