Kobalt compressor kicking breaker

by Vance Burns
(Missouri )

Kobalt 60 gallon 208-220 volt 155 psi max 5 hp motor rated 15 amp.


When starting at room temp under loaded it will kick the breaker. room temp 60 to 70 degrees.
209 volts at compressor. Motor pulling 40 amps on loaded start up. Starts fine when empty and when compressor is hot. Starts out at 2 amps when empty and goes up as pressure builds. When room temp you can here the starting capacitor clicking constantly. When warm this is not the case. Changed motor fit new one. Still same problem. Old motor was pulling 60 amps on start up. Kicks breaker Pretty quick. Pressure valve seems to be working correctly. Pulled out and could blow through freely. Compressor turns easily when belt is off.

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Feb 27, 2015
blows breaker (restart only)
by: Doug in s.d.ca

Hmmm.

209 volts...

Can you get pix of the original and replacement motor plates ? (you'll need to start a new page [use same title] to post)

Are you on a single phase of 3 phase power?

Feb 27, 2015
reply
by: Vance Burns

While I was at it I pulled top off of compressor head and cleaned reed valves in case they were gummed up. And tried running without filter in place in case filter was clogged. Still no change.

Feb 27, 2015
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by: Vance Burns

Yes I meant pressure check valve. I thought the same thing replaced the check valve yesterday. Still the same problem. Also bypassed wiring in switch to run motor directly just in case it was the shut off switch but still no change in way motor was running.

Feb 26, 2015
pressure valve?
by: Doug in s.d.ca

Do you mean check valve when you say pressure valve?

If so, when you blew through it, that that was the direction of flow? If so that's good, but does it block when you blow the other direction?

If not, then there's your problem.

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