Bradleyj
I have a Generac SVP5000 gasoline generator with maybe 100 hours on it. I have been using it lately to run power tools and a 2HP air compressor at a remote site. Until recently it had no trouble at all running this compressor, but the other day when I started up the compressor the breaker on the generator popped after just a few seconds. I tried both 120V 20A outlets and the single 30A outlet with the same result. I measure 61 Hz and 121V under no load but this drops to about 40 Hz and 100V with the compressor running and the compressor is drawing about 50A. When plugged into a house outlet the compressor runs flawlessly, drawing about 14A. Any idea what's going on here?
Quote
douglas123
Just a thought. Did you perhaps start the compressor with pressure on the tank. Don't know the whole scenario,but starting a compressor loaded will increase the amp draw immensely.
Quote
Bradleyj
This was happening even with no pressure in the tank. With the tank half-full the motor wouldn't turn at all.

I tried putting the governor spring in different holes in the arm and I've got the problem solved. It now makes 130V and about 63 Hz at no load and it starts and runs the compressor fine, dropping to 125V and 61Hz, 15.5A. I can't figure how this could have happened though. Maybe something in the governor linkage got bent slightly somehow? I can't see anything. Anyway, I think I'm good now.
Quote
douglas123
Glad you were able to get your compressor and generator back on good working terms. Tough trying to make a living and things get demons in them and make life a little more frustrating.
Quote
Hotwire
Brad, what kind of compressor oil are you using. We had the same problem, ran fine until the temps dropped. I talked to a compressor guru, and he said to switch the oil to 5W30 automotive. I switched both our portable and our shop compressors to 5W30 for 4 years now with no problems in the start ups or compressor failures.
Quote