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Posted by D Sherman [72.47.9.228] on Tuesday, August 09, 2011 at 20:29:52 :
In Reply to: Re: Ouch posted by Jerry in Idaho [64.139.238.43] on Tuesday, August 09, 2011 at 19:51:15 :
That makes sense, because a compressor is a tough load to start, especially when there's pressure in the tank. Fans and centrifugal pumps present no load until they start to speed up, so they're easy to start, but a compressor starts right in at zero RPMs trying to push against a full load. I can see how it wouldn't start at half voltage.
I still think you have a short to ground, somewhere in the compressor winding, on the leg whose breaker tripped. That would account for both the tripped breaker and the half-voltage situation. On the plus side, you've now tested your ground circuit and proven that it can carry full fault current.
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