Sofar solar CHINT DDSU666 Series User manual

Single-Phase Meter Quick Installation Guide
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1
1. Introduction
Meter has two type: direct connection type and CT connection type, below are the basic information of
these two type meters:
Type
Model
Appearance
Reference
Voltage
Frequency
Nominal
Current
Transformer
Ratio
Transformer
Connection
DDSU666
230V
50Hz/60Hz
*/100mA
2000:1
Direct
Connection
DDSU666
230V
50Hz/60Hz
5(80)A
/
2. Installation
Both type type can be mounted on DIN35 standard rails, below are wiring connection instruction.
AC wire cable, OD not less than 4mm2.
RS485 Communication Interface, Baud rate can set to 1200, 2400, 4800, and 9600. One communication circuit can maximum
connected to 32 devices, each device must set to different communication address. Communication cable use Shielded Twisted Pair Cable,
Copper OD should not less than 0.5mm2, communication cable should keep away from strong cables or other strong electric fields,
maximum distance is 1200 meters. Connection instruction as below:
Note: Different inverter has different positive and negative RS485 port, please read the User Manuel carefully when doing the
connection.
(1) Connection with Current Transformer

Single-Phase Meter Quick Installation Guide
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(2) Direct Connection
3. Check Installation Result
1. Current Direction
For CT connection type, closed the loads, meter shows import direction power (Imp); open the loads, meter shows export direction
power (Exp), then the connection direction is correct.
2. RS485 Communication
When enable the meter function, inverter will report an alarm when RS485 connection is incorrect, please check the RS485 connection
when meet this situation, normally can fix by using switch the positive and negative pole.
4. Interface
When meter is in normal working condition, indicated light is on and flashing. If indicated light is not flashing or off, please check if
the meter connection is correct.
(1) CT connection type

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Every data group indicated 5 seconds, interface as below:
Page
Content
Description
1
Voltage U=220.0V
2
Current I=5.0A
3
Active Power P=1.1W
4
Active Power Q=0W
Active Energy EImp=0.5kWh
5
Power Factor Ft=1.0
6
Frequency F=50Hz

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7
Import Active Energy
EImp=1.2kWh
8
Export Active Energy
EExp=1.0kWh
9
Current Communication Protocol
Modbus
10
Current Communication Address is
11
11
Baud rate is 9600
1:2400
2:4800
3:9600
12
current communication : 8 data bits of the
protocol, no valid bit and 1 stop bit
(2) Direct Connection Type
Every data group indicated 5 seconds, background light is 1 minutes, interface as below:
Button operation: Long press button, interface enter 645 protocol and Modbus protocol choose page, Short press can change the
protocol, cannot switch to address page (Only ModBus protocol can switch to address page)，ModBus’s address can set by using button

Single-Phase Meter Quick Installation Guide
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setting, the setting range is 1-99.
Page
Content
Description
1
Voltage U=220.0V
2
Current I=5.0A
3
Power P=1.1kW
4
Power Factor Ft=1.0
5
Frequency F=50Hz
6
Import Active Energy EImp=1.2kWh
7
Export Active Energy EExp=1.0kWh

Single-Phase Meter Quick Installation Guide
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8
Current Communication Protocol
Modbus
9
current communication : 8 data bits of the
protocol, no valid bit and 1 stop bit
10
Current Communication Address is
11
11
Baud rate is 9600
1:2400
2:4800
3:9600
5. Trouble Shooting
Problems
Reason
Troubleshooting
No display
1. The meter wiring is incorrect;
2. The voltage supplied to the meter is abnormal;
1. If the wiring is incorrect, please follow the correct wiring
instruction (see wiring diagram);
2. If the power supply voltage is abnormal, please supply
power according to the voltage range specification on Manuel
3. If it is not the above problem, please contact the local
supplier.
Current display 0
CT current sampling is abnormal.
Check whether the CT wiring is correct and stable.
RS485
Communication
Abnormal
1. The RS485 communication cable is open,
shorted, or connected reversely;
2. The address, baud rate, and data bit check digit
of the instrument does not match the host;
3. No matching resistor is added to the end of the
RS485 communication cable (usually when the
distance exceeds 100 meters);
4. The communication protocol commands of the
1. If there is a problem with the communication cable, please
replace the communication cable;
2. Set the address, baud rate and data bit check digit of the
meter is same as host by pressing the button, and the button
setting operation will "parameter setting";
3. If the communication distance is more than 100 meters,
and the meter and the host have the same communication
parameter settings, the communication still cannot be reached,

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instrument and the host do not match;
please reduce the communication baud rate or add 120Ω
resistance at the beginning and end of the communication
cable (the size of resistance can adjust according to the local
condition).
Parameter on
display is abnormal
（voltage, current,
power, etc.）
Data frame parsing error;
Analyze the data frame according to the format specified in
the communication protocol, pay attention to the data size
end mode;