SEM3-M-2

RS485 CT Connection Three Phase Din Rail Energy Meter for PV Metering

Compact design
RS485 Modbus RTU
Easy connection solution
Bi-directional measurement
Multi-parameter measurements
Accuracy Class 1.0 active energy
Support 1x3p or 3x1p load measurements
Phase Sequence Automatic Detection

400-996-9296

Eastron SEM3-M-2 is a new generation din rail mounted energy meter, equipped with RS485 connectivity. With multi parameters measurement, SEM3-M-2 can be used for energy monitoring of various applications, such as solar PV system, smart building, industrial equipment, etc. The meter can be used as 1x 3phase energy meter or 3 individual single phase energy meter. In single phase mode, 3 external CTs can be set with different CT ratio for three independent loads.

Eastron SEM3-M-2 measures characteristics of 1P2W, 3P4W and 3P3W supplies, including voltage, frequency, current, power and active and reactive energy, imported or exported, power factor, etc. Energy is measured in terms of kWh and kVArh.

Eastron SEM3-M-2 has phase sequence automatic detection and alarm function. If the phase sequence is reversed, the meter will issue an alarm. The phase sequence can be adjusted through communication.

Electrical Characteristics
Type of Measurement	RMS including harmonics on Three Phase AC System (3P, 3P+N)
Measurement Accuracy	Power	±1%
	Active Energy	±1% IEC 62053-21 Class 1
	Reactive Energy	±2%
	Frequency	±0.2%
	Current	±0.5% (4A~120A) ±1% (1A~4A) ±3% (0.06A~1A)
	Voltage	±0.5%
	Power Factor	±0.1
Data Update Rate		Active power: 50mS (RS485)
Input-Voltage	Un	3*230V(L-N)/400V(L-L)
	Working Voltage Range	90 to 277 V ac L-N 156 to 480 V ac L-L
	Frequency Range	50/60 Hz

RS485 Communications
Protocol	MODBUS RTU
Communication Address	1~247
Transmission Mode	Half duplex
Data Type	Floating point
Transmission Distance	1000m Maximum
Transmission Speed	2400bps~115200bps
Parity	None (default), Odd, Even
Stop Bits	1 or 2
Response Time	＜50mS

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