Wiring Ground Fault Monitoring For It Ungrounded Systems (Option +Q954); Setting The Voltage Range Of The Auxiliary Control Voltage Transformer (T21) - ABB ACS880-07 Hardware Manual

110 Electrical installation

Wiring ground fault monitoring for IT ungrounded systems (option +Q954)

We recommend to connect Alarm 1 for drive tripping and Alarm 2 for alarm signals in order
to avoid unnecessary trippings due to the ground fault monitor self testing with Alarm 2.
X954
Alarm 1
Alarm 2
Setting the voltage range of the auxiliary control voltage
transformer (T21)
Connect the power supply wires of the auxiliary control voltage transformer according to
the power network voltage.
1
1
1
2
3
2
2
4
Internal wiring: Ground fault alarm 1. No
ground fault = contact closed. Contact load
capacity 250 V AC 2 A.
Internal wiring: Ground fault alarm 2: No
ground fault = contact closed. Contact load
capacity 250 V AC 10 A.