I have a CH air compressor someone gave me.
Single Phase 120vac
The problem is that it won't stay running.
It will start, run for aproox 15 seconds and then trip the breaker.
I have disconnected and removed the piston to let the motor free wheel.
I have replaced both capacitors.
The circuit it is on is a 20 amp circuit.
I have unplugged everything else on the circuit, same problem.
The motor says it is 15 FLA.
Is the inrush current to high for a 20 amp breaker?
Are the windings shorted?
The motor spins fine by hand.
There is a intertia switch located on the back of the shaft.
I believe this is what changes from the start capacitor to the run capacitor.
Could this be bad?
Any hepl would be great
You gave a lot of information, but you didn't say if it worked when free wheeling. If not, I would suspect the inertia switch. If it is working, you should hear it click when the motor is winding down after being shut off, at least when free wheeling. A 20 amp breaker will certainly handle a 15 FLA motor, even on startup. They don't trip at 20 amps exactly, especially on a simple overload. Even at twice the rated amperage, it can take several minutes to trip it. They will trip quickly on a dead short, however, or a severe overload. I doubt the windings are shorted or it either wouldn't work (start windings) or would run at a slower speed with the inertia switch constantly tripping in and out with it coasting while tripped in (i.e., accelerate, coast, accelerate, coast, etc.)
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