Wacker Neuson GS 12Ai Operator's Manual - Gs 12Ai
GS 12Ai
Operation
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4.6
Isolation Monitor
Generator is equipped with an Isolation Monitor. The Isolation Monitor
consists of a sensing module (a), a TEST button with light (b), a relay
(c), and a breaker for each phase and neutral (d1-d4). The relay and
the breakers are mechanically ganged together and operate as the
main circuit breaker. The Isolation Monitor protects the operator from
a ground fault by sensing a resistance change, as in a short to ground,
on the output of the generator. When the Isolation Monitor senses a
resistance change, it lights the TEST button and it causes the relay to
open, which mechanically trips the main circuit breaker. The Isolation
Monitor cannot be reset with the generator running. Before the
main circuit breaker can be closed, the generator must first be shut
down, the fault cleared, and the generator restarted.
To test the Isolation Monitor:
Start the generator. Place the main circuit breaker in the closed
position (e1). Push the TEST button (b). The TEST button will light up,
and the main circuit breaker will move to the open position (e2). Power
is now off at the receptacles. If the breaker does not open, the Isolation
Monitor is not working. Do not use the generator until the problem can
be corrected. To restore power to the receptacles, shut down the
generator, restart it, and place the circuit breaker in the closed position
(e1).
The main circuit breaker is current-operated and shuts off the power to
the receptacles when an overcurrent occurs that is greater than what
the breaker is rated for.
If the circuit breaker lever opens during operation, stop the generator
and check the generator and any equipment it was powering for
defects. Repair all defects before operating the generator.