1
Chapter 1 Meter Overview
DZ81-MS3UI7C is an advanced smart power meter. It is widely used in power distribution sites,
energy management systems and intelligent monitoring systems of different industries. It measures
electric parameters i.e. three-phase/line voltage, three-phase current, active power, reactive power,
power factor, frequency, active energy, reactive energy etc. Equipped 1-channel 485 communication
interface and 2-channel of pulse output, it supports standard Modbus RTU communication protocol.
Display: LCD Display
Chapter 2 Specifications
2.1 Input Voltage
Reference Voltage: 3×220V/380V Voltage Range: 0~1.2Un
2.2 Input Current
Secondary Current of CT: 1(5)A Current Range: 0~1.2In
2.3 Frequency Measurement
Frequency Measuring Range: 45~65Hz
2.4 Measuring Accuracy
Voltage/Current Accuracy Class: 0.2%
Energy Accuracy Class: Class 0.2S
Power Factor: 0.1%
Frequency: ±0.01Hz
2.5 Communication
RS485/Modbus-RTU Communication Protocol Baud Rate: 1200~9600bps (programmable)
Remark:
DZ81-MS3UI7C adopts RS485 interfaces and Modbus RTU communication protocol to communicate. The
terminals are 485A and 485B. The RS485 transmission medium is shielded twisted pair. In addition, the RS485 interfaces
can also be used for device maintenance and upgrading. The communication default values are as follows.
Communication Default Value
Address
Baud Rate
Data Bits
Stop Bits
Parity
01
9600bps
8
1
No
2.6 Power Supply
Power Supply: AC85~265V(45
～
55HZ)/ DC85
～
300V Power Consumption: <3VA
Power-line Connection Terminals: L/+ and N/-
Remark:
Terminals for the power supply are (L/+, N/-). If the quality of power is poor or there is an EMI problem, it’s
recommended to equip an EMC filter in the auxiliary power supply loop to increase resistance to interference.
