fastline
Senior Member
- Location
- midwest usa
I borrowed one of these oiless 5HP compressors that I really need for a one day job but of course it has issues......:rant:
Plugged it into the genny and could hear it pulling way too much power. Inrush test was 46A, constant current is 30A, obviously kicked it out after a few seconds.
Here are the specs
240V, 1PH, 14A FLA, 3450rpm, compressor direct coupled to motor, spins free as a bird.
Things checked
Motor and compressor freewheel by hand without issue, start and run cap test good, motor windings not showing conduction to ground, motor running RPM is 2500, end bell of motor removed and centrifugal switches look and test decent(5-7ohms but should work?), Verified 245V no load to compressor, the load pulls it down to 210V but genny only rated to 5000W or 21A I guess
IMO, this points to a good motor and a problem with the load on it? The load is SO simple that I would be surprised if that is it but the tests point that way. I verified also that the compressor is kicking out plenty of compressed air and seems to function just fine. I have fixed compressors in the past when a check valve is failing causing compressed air to stay in the pump but I have pulled the air line so it is not doing anything. Nothing changes the current.
Is it possible that I just don't have enough generator on it? I noticed the start cap was a bit warm but at 2500rpm, would that thing still be in circuit? That would sure answer the question.
Plugged it into the genny and could hear it pulling way too much power. Inrush test was 46A, constant current is 30A, obviously kicked it out after a few seconds.
Here are the specs
240V, 1PH, 14A FLA, 3450rpm, compressor direct coupled to motor, spins free as a bird.
Things checked
Motor and compressor freewheel by hand without issue, start and run cap test good, motor windings not showing conduction to ground, motor running RPM is 2500, end bell of motor removed and centrifugal switches look and test decent(5-7ohms but should work?), Verified 245V no load to compressor, the load pulls it down to 210V but genny only rated to 5000W or 21A I guess
IMO, this points to a good motor and a problem with the load on it? The load is SO simple that I would be surprised if that is it but the tests point that way. I verified also that the compressor is kicking out plenty of compressed air and seems to function just fine. I have fixed compressors in the past when a check valve is failing causing compressed air to stay in the pump but I have pulled the air line so it is not doing anything. Nothing changes the current.
Is it possible that I just don't have enough generator on it? I noticed the start cap was a bit warm but at 2500rpm, would that thing still be in circuit? That would sure answer the question.