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● Active energy (Wh) Class 1 IEC 62053-21
● Reactive energy (VARh) ±1% of range maximum
● Total harmonic distortion 1% up to 31st harmonic
● Temperature co-efficient Voltage and current = 0.013%/°C typical
Active energy = 0·018%/°C, typical
● Response time to step input 1s, typical, to >99% of final reading, at 50 Hz.
Interfaces for External Monitoring
Three interfaces are provided:
● an RS485 communication channel that can be programmed for Modbus RTU protocol
● an Pulse output(Pulse 1) indicating real-time measured energy.(configurable)
● an Pulse output(Pulse 2) 400imp/kWh
The Modbus configuration (Baud rate etc.) and the pulse output assignments (kW/kVArh,
import/export etc.) are configured through the Set-up screens.
Pulse Output
The unit provides two pulse outputs. Both pulse outputs are passive type.
Pulse output 1 is configurable. The pulse output can be set to generate pulses to represent total /
import/export kWh or kVarh.
The pulse constant can be set to generate 1 pulse per:
dFt = 2.5 Wh/VArh
0.01 = 10 Wh/VArh
0.1 = 100 Wh/VArh
1 = 1 kWh/kVArh
10 = 10 kWh/kVArh
100 = 100 kWh/kVArh
Pulse width: 200/100/60ms
Pulse output 2 is non-configurable. It is fixed up with active kWh. The constant is 400imp/kWh.
RS485 Output for Modbus RTU
For Modbus RTU, the following RS485 communication parameters can be configured from the Set-
up menu:
Baud rate 2400, 4800, 9600, 19200, 38400
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.
Reference Conditions of Influence Quantities
Influence Quantities are variables that affect measurement errors to a minor degree. Accuracy is
verified under nominal value (within the specified tolerance) of these conditions.
● Ambient temperature 23°C ±1°C
● Input frequency 50 or 60Hz ±2%
● Input waveform Sinusoidal (distortion factor < 0·005)
● Magnetic field of external origin Terrestrial flux
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