Woodward MRM4, Manual

Page: 428 / 460

Technical Data
Current and Earth Current Measurement
Plug-in Connectors with Integrated Short-Circuiter
(Conventional Current Inputs)
Nominal currents: 1 A / 5 A
Max. measuring range: up to 40 x In (phase currents)
up to 25 x In (earth current standard)
Nominal currents:
(Earth Current Sensitive)
0.1 A / 0.5 A
Max. measuring range:
(Earth Current Sensitive)
up to 2.5 x In
Continuous loading capacity: 4 x In/continuously
Overcurrent proof: 30 x In/10 s
100 x In/1 s
250 x In/10 ms (1 half-wave)
Power consumption: Phase current inputs:
at In = 1A S = 0.15 mVA
at In = 5A S = 0.15 mVA
Earth current input:
at In = 1A S = 0.35 mVA
at In = 5A S = 0.35 mVA
Frequency range: 50 Hz / 60 Hz ±10%
Terminals:
Screws:
Screw-type terminals with integrated short-circuiters (contacts)
M4, captive type acc. to VDEW
Connection Cross Sections: 1 x or 2 x 2.5 mm² (2 x AWG 14) with wire end ferrule
1 x or 2 x 4.0 mm² (2 x AWG 12) with ring cable sleeve or cable sleeve
1 x or 2 x 6 mm² (2 x AWG 10) with ring cable sleeve or cable sleeve
The current measuring board´s terminal blocks may be used as with 2
(double) conductors AWG 10,12,14 otherwise with single conductors only.
Voltage Supply
Aux. Voltage: 24V - 270 V DC/48 - 230 V AC (-20/+10%)
Buffer time in case of supply failure: >= 50 ms at minimal aux. voltage
communication is permitted to be interrupted
Max. permissible making current:
18 A peak value for
<
0.25 ms
12 A peak value for
<
1 ms
The voltage supply must be protected by a fuse of:
•
2,5 A time-lag miniature fuse 5x20 mm (approx. 1/5” x 0.8”) according to IEC 60127
•
3,5 A time-lag miniature fuse 6,3x32 mm (approx. 1/4” x 1 1/4”) according to UL 248-14
Page 428 EN MRM4 01/11