[Shop-talk] Air Compressor ?

[Frank Vantacich]

I just installed an Atlas Copco model KT75PV80 air compressor, 90 gallon, 7.5hp motor 25 acfm 175 psi.  If I run it down to 150psi and the compressor attempts to start up the magnetic relay trips on the compressor. If I let it deplete to 25 or 50 lbs it will start right up and cut off at 175psi.

It's on a 40 amp circuit and supplying 233 volts, the circuit breaker in the main panel does not trip just the relay on the compressor.

The compressor is always free wheeling, in other words there is never a load on the compressor when it starts up.

Frank V.  rustymetal at sbcglobal.net