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7.3.1 Voltage specifications
The standard meter is designed for measurements on 230/400 V 3-phase systems with neutral wire. Other
voltages and configurations are available on request.
Input impedance ›1,3 MOhm
Burden max 0,15 VA per phase
7.3.2 Current specifications
The phase and polarity of the current input is an essential parameter for proper parameters indication.
The standard current specifications are listed below:
Rated current (Ib) 1 / 5 Ar m s programmable
Min / Max measurable current 20mA / 7Ar m s
Maximum overload 10 Ar m s continuous - 100 Ar m s for 1 second
Input impedance 0,02 Ohm approximately
Burden max 0,5 VA per phase
Insulation voltage 480Va c max between phases
Rogowski coils input (optional) 200÷49995 A (according to the requested value-refer to the instrument label)
7.4 POWER SUPPLY
The instrument is directly powered from all the 3 phases. The standard measuring, counting and display
functions are guaranteed also by only one phase. The serial communication is interrupted if phase 1 (1 or
2 in case of 3-3-3 connection) fails, except for 19÷60Vd c external power supply (option, available only on
request). The installer must protect the instrument with an external fuse or other 100 mA delayed protection
device (only on phase 1 for instruments with serial communication port - see wiring diagrams Pict. B-D-F).
In case of 19÷60Vd c external power supply (option, available only on request), carry out the connections as
shown in the picture of the chapter "Electrical Connections".
WARNING!
Before connecting the instrument to the network, check the network voltage corresponds
to the value on the label. Any insertion of the power supply connector into the serial output
would seriously damage the instrument.
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