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XHD331-R is a multifunctional rail type meter, which can accurately meter and display various power parameters in
three-phase three-wire and three-phase four-wire power grids, such as voltage, current, power, frequency, demand,
active power, reactive power, forward power, backward power, total harmonic content, etc.
The meter is connected to external transformer and suitable for various high-voltage and low-voltage power grids,
with maximum current of 9999A and maximum voltage of 660KV. It has RS485 communication interface, and can realize
remote communication.
XHD331-R multifunctional power meter can be used in power systems, public facilities, industrial applications and
residences, AC charging pile, solar photovoltaics and other occasions. Its complete communication functions make it
very suitable for various real-time power monitoring systems.
2.1 Technical parameters
◆ Input voltage: L-N voltage: 57.5V-380V; L-L voltage: 100V-660V
Primary voltage: 10V-660KV (It is required to be converted to secondary voltage through a voltage
transformer and then be connected to the meter)
Secondary voltage: 100V / 220V / 380V
Auxiliary power supply: AC or DC 85V ~ 265V
◆ Input current: Primary current: 5A-9999A
Secondary input voltage: 0.333Vac
Short time over-current: 20 times maximum current lasts 0.5 seconds
◆ Input frequency: Rated value: 50 / 60Hz
◆ Withstanding voltage capacity: AC withstanding voltage : 4KV/1min
◆ Power consumption: ≤ 2W
◆ Pulse output: 1 active pulse, 1 reactive pulse, fixed pulse constant is 3200imp/kWh
◆ Maximum reading: 999999.99MWh / MVarh
2.2 Measurement accuracy
◆ Voltage: 0.5%
◆ Current: 0.5%
◆ Frequency: 0.2%
◆ Power factor: 1%
◆ Active power: 1%
◆ Reactive power: 1%
◆ Active electrical energy: 0.5%
◆ Reactive electrical energy: 1%
2.3 RS485 communication
◆ Bus type: RS485
◆ Communication protocol: Modbus-RTU (default) / DL / T645-2007 / DL / T645-1997
◆ Baud rate: 4800 / 9600 / 19200
◆ Address range: 1-247
◆ Parity : None (default) / EVEN / ODD
◆ Data bit: 8 bits
◆ Stop bit: 1 bit2.4 Performance standards
◆ Operating humidity: ≤ 90%
◆ Storage humidity: ≤ 95%
◆ Operating temperature: -25℃~+55℃
◆ Storage temperature: -40℃~+70℃
◆ Required standard: GB-T 17215 / EN62053-21 / EN50470-1 / 3
◆ Accuracy class: Class 1.0
◆ Installation category: CAT III
◆ Protection class: IP51 (indoor)
◆ Insulation class: II
◆ Altitude: ≤ 2000m
3. Shape and installation dimensions
◆ Rail installation
◆ Screw fixed installation
◆ Wall-mounted installation
4. Wiring diagram
5. Operating instructions
5.1 Button definition
 | ➢ On the measurement interface: Press this button to switch and display the same type of electrical parameters ➢ On the programming interface: 1. Press this button to enter the next level menu; 2. After the parameter modification is completed, press this button to confirm the modification and return to the previous le |
 | ➢ On the measurement interface: Long press this button for more than 1 second to enter the programming menu ➢ On the programming interface: 1. Press this button to return to the previous menu. 2. After the parameter modification is completed, press this key to give up the modification and return to the previous menu. 3. On the "SAVE" interface, press this button to give up saving the parameters |
 | ➢ On the measurement interface, press this button to switch and display different types of electrical parameters ➢ On the programming interface: 1. Press this button to switch and display the same level of programming parameters; 2. Press this button to modify the programming parameters |
 | ➢ On the measurement interface, press this button to switch and display different types of electrical parameters ➢ On the programming interface: 1. Press this button to switch and display the same level of programming parameters; 2. Press this button to modify the programming parameters |
There are four buttons on the panel. They are
, 
,,from top to bottom respectively.
6. Communication
6.1 Overview of communication protocol
This protocol is applicable to the communication between the meter and the background monitoring.
Modbus-RTU communication protocol is adopted to read and write the operating data of the meter in real time
U8 --------Unsigned 8-bit integer data
U16 --------Unsigned 16-bit integer data, high byte is put at first, and low byte is put later (big-endian format)
S16 ---------Signed 16-bit integer data, high byte is put at first, and low byte is put later (big-endian format)
FLOAT-------Single precision floating point number, high word is put at first, and low word is put later high byte first.
High bytes are put at first, and low bytes are put later (big-endian format)
6.5 Communication example
◆ The communication address of the meter is 1, which reads the primary A-phase current value
The master sends (HEX)
01 04 00 1C 00 02 B0 0D
The slave responses (HEX) (big-endian format)
01 04 04 42 C8 00 00 6E 02
XHD331-R is a multifunctional rail type meter, which can accurately meter and display various power parameters in
three-phase three-wire and three-phase four-wire power grids, such as voltage, current, power, frequency, demand,
active power, reactive power, forward power, backward power, total harmonic content, etc.
The meter is connected to external transformer and suitable for various high-voltage and low-voltage power grids,
with maximum current of 9999A and maximum voltage of 660KV. It has RS485 communication interface, and can realize
remote communication.
XHD331-R multifunctional power meter can be used in power systems, public facilities, industrial applications and
residences, AC charging pile, solar photovoltaics and other occasions. Its complete communication functions make it
very suitable for various real-time power monitoring systems.
2.1 Technical parameters
◆ Input voltage: L-N voltage: 57.5V-380V; L-L voltage: 100V-660V
Primary voltage: 10V-660KV (It is required to be converted to secondary voltage through a voltage
transformer and then be connected to the meter)
Secondary voltage: 100V / 220V / 380V
Auxiliary power supply: AC or DC 85V ~ 265V
◆ Input current: Primary current: 5A-9999A
Secondary input voltage: 0.333Vac
Short time over-current: 20 times maximum current lasts 0.5 seconds
◆ Input frequency: Rated value: 50 / 60Hz
◆ Withstanding voltage capacity: AC withstanding voltage : 4KV/1min
◆ Power consumption: ≤ 2W
◆ Pulse output: 1 active pulse, 1 reactive pulse, fixed pulse constant is 3200imp/kWh
◆ Maximum reading: 999999.99MWh / MVarh
2.2 Measurement accuracy
◆ Voltage: 0.5%
◆ Current: 0.5%
◆ Frequency: 0.2%
◆ Power factor: 1%
◆ Active power: 1%
◆ Reactive power: 1%
◆ Active electrical energy: 0.5%
◆ Reactive electrical energy: 1%
2.3 RS485 communication
◆ Bus type: RS485
◆ Communication protocol: Modbus-RTU (default) / DL / T645-2007 / DL / T645-1997
◆ Baud rate: 4800 / 9600 / 19200
◆ Address range: 1-247
◆ Parity : None (default) / EVEN / ODD
◆ Data bit: 8 bits
◆ Stop bit: 1 bit2.4 Performance standards
◆ Operating humidity: ≤ 90%
◆ Storage humidity: ≤ 95%
◆ Operating temperature: -25℃~+55℃
◆ Storage temperature: -40℃~+70℃
◆ Required standard: GB-T 17215 / EN62053-21 / EN50470-1 / 3
◆ Accuracy class: Class 1.0
◆ Installation category: CAT III
◆ Protection class: IP51 (indoor)
◆ Insulation class: II
◆ Altitude: ≤ 2000m
3. Shape and installation dimensions
◆ Rail installation
◆ Screw fixed installation
◆ Wall-mounted installation
4. Wiring diagram
5. Operating instructions
5.1 Button definition
| ➢ On the measurement interface: Press this button to switch and display the same type of electrical parameters ➢ On the programming interface: 1. Press this button to enter the next level menu; 2. After the parameter modification is completed, press this button to confirm the modification and return to the previous le |
| ➢ On the measurement interface: Long press this button for more than 1 second to enter the programming menu ➢ On the programming interface: 1. Press this button to return to the previous menu. 2. After the parameter modification is completed, press this key to give up the modification and return to the previous menu. 3. On the "SAVE" interface, press this button to give up saving the parameters |
| ➢ On the measurement interface, press this button to switch and display different types of electrical parameters ➢ On the programming interface: 1. Press this button to switch and display the same level of programming parameters; 2. Press this button to modify the programming parameters |
| ➢ On the measurement interface, press this button to switch and display different types of electrical parameters ➢ On the programming interface: 1. Press this button to switch and display the same level of programming parameters; 2. Press this button to modify the programming parameters |
There are four buttons on the panel. They are, ,,from top to bottom respectively.
6. Communication
6.1 Overview of communication protocol
This protocol is applicable to the communication between the meter and the background monitoring.
Modbus-RTU communication protocol is adopted to read and write the operating data of the meter in real time
U8 --------Unsigned 8-bit integer data
U16 --------Unsigned 16-bit integer data, high byte is put at first, and low byte is put later (big-endian format)
S16 ---------Signed 16-bit integer data, high byte is put at first, and low byte is put later (big-endian format)
FLOAT-------Single precision floating point number, high word is put at first, and low word is put later high byte first.
High bytes are put at first, and low bytes are put later (big-endian format)
6.5 Communication example
◆ The communication address of the meter is 1, which reads the primary A-phase current value
The master sends (HEX)
01 04 00 1C 00 02 B0 0D
The slave responses (HEX) (big-endian format)
01 04 04 42 C8 00 00 6E 02
