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Discussion Starter · #1 ·
Service call today had a drill press that nuisance tripped gfi. No ordinary drill though. Plugs into 120 and has its own phase converter/ drive for speed control to three phase motor. Tried it into another gfi and it tripped it as well. No instruction manual, so did grounding assured test on it , gave it a single dedicated recept, and taped the cord green for spring. Then walked away.
 

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Discussion Starter · #5 ·
A lot of components involved in a phase converter. Especially when derived from a grounded circuit. I am open for answers. I am over my head troubleshooting. Ohmed ground to neutral on cord. Not even gonna think about meggering.
 
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