Wacker Neuson G 7Ai Operator's Manual

Wacker Neuson G 7Ai Operator's Manual Manual pdf 24 page image

Operation G 7Aiwc_tx000235gb.fm 224.7 Isolation MonitorSee Graphic: wc_gr000274Generator is equipped with an Isolation Monitor. The Isolation Monitorconsists 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 andthe breakers are mechanically ganged together and operate as themain circuit breaker. The Isolation Monitor protects the operator froma ground fault by sensing a resistance change, as in a short to ground,on the output of the generator. When the Isolation Monitor senses aresistance change, it lights the TEST button and it causes the relay toopen, which mechanically trips the main circuit breaker. The IsolationMonitor cannot be reset with the generator running. Before themain circuit breaker can be closed, the generator must first be shutdown, the fault cleared, and the generator restarted.To test the Isolation Monitor:Start the generator. Place the main circuit breaker in the closedposition (e1). Push the TEST button (b). The TEST button will light up,and the main circuit breaker will move to the open position (e2). Poweris now off at the receptacles. If the breaker does not open, the IsolationMonitor is not working. Do not use the generator until the problem canbe corrected. To restore power to the receptacles, shut down thegenerator, restart it, and place the circuit breaker in the closed position(e1).The main circuit breaker is current-operated and shuts off the power tothe receptacles when an overcurrent occurs that is greater than whatthe breaker is rated for.If the circuit breaker lever opens during operation, stop the generatorand check the generator and any equipment it was powering fordefects. Repair all defects before operating the generator.a b c d1 d2 d3 d4e1e2wc_gr000274