110VAC air comp runs high amps

by bob
(Sparta, NJ )

I have a 110VAC 33 gal air compressor rated for 15 amps. Start capacitor works fine, run capacitor checks fine with meter and replaced it anyhow. Start up and it runs at around 40amps !?!?!? and will not drop, trips circuit ? any ideas what is wrong ? Is there an issue with the motor windings ??? It is not bound up and turns free by hand

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Oct 20, 2016
110VAC air comp runs high amps no more
by: Doug in s.d.ca

Good work!

Glad to hear you got it fixed, and thanks for the update.

Oct 16, 2016
air compressor draws 40 amps !
by: bobbyg

got it, thanx for the comments but it was a shorted motor. Something must have gotten in between the rotor and stator and really scored it up which in turn shorted one of the winding wires to ground (the iron core the windings are wrapped around).

I did a ohm test from the hot wire to ground and yes a short.

I wasn't sure about cutting back the one winding wire and isolating it, but I did. Epoxied the windings to re-insulate and put motor back together and drawing only 10 amps now instead of 40. Works fine now :o)

Oct 07, 2016
110VAC air comp runs high amps
by: Doug in s.d.ca

Have you tried it with the drain valve open? See what happens that way.

Further, if it's a belt-driven machine, you can remove the belt and what happens.

If you still see high current, then probably the motor is shorted internally, but maybe not - take it to a motor shop if there's one local.

Otherwise, new motor time.

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