Compressor pulls near 200 amps then trips circuit breaker
by nick maranta
(san jose, ca)
I have a 120 gallon speedaire air compressor model #5Z405D that is powered by a leeson 10hp single phase 220v farm duty motor. It will run for a few seconds sometimes and run properly other times before tripping the wall circuit breaker. The unloader valve seems to work properly. We have replaced all 3 capacitors with no improvement. When it fails, it seems to grunt or run with a deeper tone prior to tripping breaker. Both pump and motor spin by hand unloaded. Also it seems to run longer before failing with the air filters removed. Compressor was in storage for many years. We changed pump oil. It ran perfectly for 4-5 days before these problems started. Thanks a million for any advise.