Eastron SDM72CT-M User manual

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
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⚫Measures kWh, W 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 V1.4
2017

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
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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 power, active
energy, imported or exported. Energy is measured in terms of kWh. 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 20max 0I 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:
⚫Power
⚫Active energy imported and exported
Two pulse output indicates real-time energy measurement. An RS485 output allows remote monitoring from
another display or a computer.

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
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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
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 3000m
Warm up time 10s
Installation category CAT III
Mechanical Environment M1
Electromagnetic environment E2
Degree of pollution 2

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
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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
>Set-up mode entry
>Confirmation

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
- 5 -
Scroll display
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 active power (W)
Active power L1
Active power L2
Active power L3

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
- 6 -
CT ratio
Pulse 1
Modbus Address
Baud Rate
Parity

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
- 7 -
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
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

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
- 8 -
5-1
0001 to 2000. For example, if using a 100A/5A current
transformer, you shall enter 0020.
Keep press for 3s to confirm the selection.
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.

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
- 9 -
Wiring diagram
Dimensions

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
- 10 -
Input Registers
PART 3 Modbus Protocol
Input registers are used to indicate the present values of the measured and calculated electrical quantities. Each
parameter is held in two consecutive 16 big register. The following table details the 3X register address, and the
values of the the address bytes within the message. A (*) in the column indicated the parameter is valid for the
particular wiring system, Any parameter with a cross (X) will return the value zero. Each parameter is held in the 3X
registers. Modbus Protocol function code 04 is used to access all parameters.
For example, to request: Amps 1 Start address = 0006
No.of registers = 0002
Amps 2 Start address = 0008
No. Of register = 0002
Each request for data must be restricted to 30 parameters or less. Exceeding the 30 parameter limit will cause a
Modbus Protocol exception code to be returned.
Address
(Register)
Input Register Parameter
Modbus
Protocol Start
Address Hex
3
Ø
3
Ø
1
Ø
Description
Length
(bytes)
Data
Format
Units
Hi
Byte
Lo
Byte
4
W
3
W
2
W
30013
Phase 1 active power.
4
Float
W
00
0C
√
X
√
30015
Phase 2 active power.
4
Float
W
00
0E
√
X
X
30017
Phase 3 active power.
4
Float
W
00
10
√
X
X
30053
Total system power.
4
Float
W
00
34
√
√
√
30073
Import Wh since last reset .
4
Float
kWh
00
48
√
√
√
30075
Export Wh since last reset .
4
Float
kWH
00
4A
√
√
√
30343
Total kwh (3)
4
Float
kWh
01
56
√
√
√
Notes:
1. The power factor has its sign adjusted to indicate the direction of the current. Positive refers to forward current,
negative refers to reverse current.
2. The power sum demand calculation is for import –export.
3. Total kWh / kVarh equals to Import + export.

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
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Holding Registers
Holding register are used to store and display instrument configuration settings. All holding registers not listed
in the table below should be considered as reserved for manufacturer use and no attempt should be made to
modify their values.
The holding register parameters may be viewed or changed using the Modbus Protocol. Each parameter is held
in two consecutive 4X registers. Modbus Protocol Function Code 03 is used to read the parameter and Function
code 10 is used to write. Write only to one parameter per massage.
Address
Register
Parameter
Number
Parameter
Modbus Protocol
Start Address Hex
Valid range
Mode
High Byte
Low Byte
40013
7
Pulse 1 Width
00
OC
Write pulse on period in
milliseconds: 60, 100 or 200, default 200.
Length : 4 byte
Data Format : Float
r/w
40015
8
Access authority
(write password to
get the access and
read the status of the
access)
(KPPA)
00
0E
Read: to get status of the current access.
0: failed to get the access
1 : already got the access
Write: write correct password to get the
access
Length : 4 byte
Data Format : Float
r/w
40019
10
Parity / Stop
00
12
Write the network port parity/stop bits for
MODBUS Protocol, where: 0 = One stop bit
and no parity, default. 1 = One stop bit and
even parity. 2 = One stop bit and odd parity.3
= Two stop bits and no parity.
Length : 4 byte
Data Format : Float
r/w
40021
11
Modbus Address
00
14
Write the network port node
address: 1 to 247 for MODBUS Protocol,
default 1.
Length : 4 byte
Data Format : Float
r/w
40023
12
Pulse 1 Rate
00
16
Write pulse rate index: n
= 1 to 5
1--0.01kwh/imp
2--0.1kwh/imp
3--1kwh/imp
4-10kwh/imp
r/w

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
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5-100kwh/imp
Length : 4 byte
Data Format : Float
40025
13
Password
00
18
Read：get password
Write：change password
Length : 4 byte
Data Format : Float
r/w
40029
15
Network Baud Rate
00
1C
Write the network port baud rate for
MODBUS Protocol, where:
0 = 2400 baud. 1 = 4800 baud.
2 = 9600 baud ( default).
5 = 1200 band
Length : 4 byte
Data Format : Float
r/w
40033
17
CT ratio
00
20
CT ratio ( Range: 0001－2000)
Default: 1
Length : 4 byte
Data Format : Float
(KPPA is asked)
r/w
40059
30
Time for scrolling
display
00
3A
Default: 0, Unit: s
Range: 0~30, ( 0 means close scrolling)
Length : 4 byte
Data Format : Float
r/w
40061
31
Time of back light
00
3C
Default: 0. Unit: min
Rang :0~120. ( 0 means the back light will
work all the time )
Length : 4byte
Data Format : Float
r/w
40087
44
Pulse 1 Energy Type
00
56
Write MODBUS Protocol
input parameter for pulse
output 1：
1: import active energy
2: total active energy
4: export active energy, default
5: import reactive energy
6: total reactive energy
8: export reactive energy
Length : 4 byte
Data Format : Float
r/w

B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: [phone] F: [phone] M: [e-mail] W: www.eastron-germany.de
- 13 -
Accessory CTs
Split Core CTs ESCT-T Series
Model
Primary (A)
Second Output (A)
Accuracy
ESCT-T24
100
5A or 1A
0.5 or 1
ESCT-T24
150
5A or 1A
0.5 or 1
ESCT-T24
200
5A or 1A
0.5 or 1
ESCT-T24
250
5A or 1A
0.5 or 1
ESCT-T24
300
5A or 1A
0.5 or 1
ESCT-T24
400
5A or 1A
0.5 or 1
ESCT-T36
100
5A or 1A
0.5 or 1
ESCT-T36
150
5A or 1A
0.5 or 1
ESCT-T36
200
5A or 1A
0.5 or 1
ESCT-T36
300
5A or 1A
0.5 or 1
ESCT-T36
400
5A or 1A
0.5 or 1
ESCT-T36
500
5A or 1A
0.5 or 1
ESCT-T36
600
5A or 1A
0.5 or 1