Eastron SDM72DM User manual

B+G e-tech EASTRON SDM72D-M User Manual V1.5 English version
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Measures active kWh & W.
Resettable partial energy
Bi-directional measurement IMP & EXP
Pulse Output
RS485 Modbus
Din rail mounting 35mm
Direct connection, up to 100A
Better than Class 1/ B accuracy
SDM72D-M
Three Phase Four Wire Energy Meter
User Manual V1.5
2017

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Introduction
The SDM72D-M is digital three phase 4 wire energy meter with a white back-lighted LCD screen for perfect
reading. The unit measures and displays active energy (kWh) and power (W), imported and exported. A resettable
partial energy is provided, so the user can easily check the energy imported and energy exported during a certain
period. SDM72D-M supports max.100A direct connection, saves the cost and avoid the trouble to connect
external CTs, giving the unit a cost-effective and east operation. Built-in interfaces provide 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) 10A AC
Max. Current (Imax) 100A 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 30max 0I for 0.01s
Pulse output rate 1000imp/kWh (Pulse 2)
Display LCD with backlit
Max. Reading 999999.9kWh
Active energy Class 1 IEC62053-21
Class B EN50470-3

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Unit Characteristics
The Unit can measure and display:
Power
Active energy imported and exported
Pulse output indicates real-time energy measurement. An RS485 output allows remote monitoring from another
display or a computer.
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 pulse output for active kWh. The Pulse output is passive type.
The pulse out 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.

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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
Mechanics
Din rail dimensions 72x100x66 (WxHxD) DIN 43880
Mounting DIN rail 35mm
Sealing IP51 (indoor)
Material self-extinguishing UL94V-0

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PART 2 Operation
Initialization Display
When it is powered on, the meter will initialize and do self-checking.
Full Screen
Software Version
Pulse constant
Total active energy(kWh)
Total=Import+ Export
Max read: 999999.9 kWh

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Scroll display
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
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

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Total partial energy(kWh)
Total=Import+ Export
Import partial energy
export partial energy
Total active power
Import active power
Export active power
Pulse constant

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Modbus Address
Baud Rate
Parity

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Set-up Mode
To get into Set-up Mode, the user need press the “Enter” button for 3 seconds.
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 seconds, 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 seconds, 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 )

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Keep press for 3s to confirm the selection.
5
Use to select the Password option. Keep
pressing for 3 seconds, 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
Keep pressing button to exit the set-up mold.

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Wiring diagram
3 phase 4 wire
2 phase 3 wire

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Dimensions
Installation

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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
Description
Length
(bytes)
Data
Format
Units
Hi
Byte
Lo
Byte
30053
Total system power.
4
Float
W
00
34
30073
Total Import kWh
4
Float
kWh
00
48
30075
Total Export kWh.
4
Float
kWh
00
4A
30343
Total kWh (1)
4
Float
kWh
01
56
30385
resettable total active energy (1)
4
Float
kWh
01
80
30389
resettable import active energy
4
Float
kWh
01
84
30391
resettable export active energy
4
Float
kWh
01
86
31281
Total import active power
4
Float
W
05
00
31283
Total export active power
4
Float
W
05
02
Notes: 1. Total kWh equals to Import + export.

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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
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
40025
13
Password
00
18
Read：get password
Write：change password
Length : 4 byte
r/w

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Data Format : Float
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
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
461457
30729
Reset
F0
10
00 03：reset the resettable energy
Length : 2 byte
Data Format:Hex
wo