220v ingersoll rand 10hp burning my contactor - is low voltage the problem?

by Frank
(Tustin )

I have a 220v ingersoll rand 10hp that keeps burning my contactor I just noticed that my power going into the compressor is 208v power would that have something to do with it?

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Frank, I'm no electrician, so I hope that an electrical type will comment here to. It is my understanding that low voltage will burn contactors, but I don't know if 208 volts is low enough to be the problem. Sounds like it, but we;ll have to wait for someone that knows for sure.

Cheers,

Bill

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May 19, 2016
220v vs 208v.
by: James Kahler

220 is what your tester would read if you went between the two feeds of a single phase 120/240 service. 208 is what you get between two of the three legs of a three phase 120/208 service. Between hot and ground you get 120 per leg in both types.

I'm not sure if the motor can be rewired, I was in the 10HP ing rand and the diagram only showed one way and is factory wired.

Mine is has burned two contactors and I'm not seeing a reason why.

Aug 29, 2012
22V air comp issue
by: steve longo

The contactor mag coil may be weak. Feed wiring size too small especially if aluminum. No penetrox on connections. Bad connections at terminals. Wrong contactor continuous running amperage rating. Contactor points may be pitted. Mag may be binding on track. Check supply voltage. Heater protection wrong amperage or bad connection. 24 volt control coil bad, low volts.

Steve longo longovste2000@yahoo.com
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Thank you for that, Steve. Your knowledge of electrical issues are clearly far superior to mine. Professional advice is always welcome for the thousands of people that visit this site for help.

Cheers,

Bill


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