IR 2475 6 hp motor tripping 50 amp breaker
(Evans co )
I have a IR 2475, 2 stage, 80 gal compressor.
I got this compressor on craigslist and it was in pieces for shipping. Everything seemed to be there but the control panel for the 3 phase motor.
It says 5hp 3ph motor on the tank but the motor and compressor are missing plates.
I first got a VFD to convert to 3ph and the first time it ran up to 150 psi and I shut it off there. The next day I did final wiring and got the pressure switch wired in but it wouldn't take off.
I blew down the pressure and it would run for 30 40 seconds then trip breaker.
I figured the VFD was under powered and sent it back.
At this point it was the same price to get a new 1ph motor.
I got a 6hp motor at tractor supply and got it wired up.
It was still doing the same thing it was at this point I went to a 50 amp breaker from the 30. Still doing it.
I troubleshot the pressure valve and with 100lbs there is no bleed off when the discharge line is unhooked.
I then took off the heads and looked at the valves, they looked fine. They were a little oily but nothing to serious. I cleaned everything up and put it back together. Same problem.
I have wire going to it that is at least 6 gauge and only 7' hard wired into breaker panel.
Have 240 at the motor.
The pressure seems to bleed off fine with the pressure switch.
I adjusted the belt a little and with it loose it squeals, it seems to do better but still trips the breaker.
It isn't always the breaker sometimes it is the thermal switch in the motor.
I changed the oil before running it with IR oil and a new filter. I put a quart in, the oil is right to the bottom of threads.
I am at a loss now.
Now I'm thinking it might be a 7.5 HP compressor and I am under powered to turn it over, getting worse with added pressure.
2475N7.5 breaker trips after 5 seconds
by Scott L.
I just installed a "Brand New" Ingersoll Rand Compressor.
Single Phase / 230v. 60Hz.
Model #: 2475N7.5
It's a 7.5 hp. and I put it on a 2-Pole 50amp. breaker (22,000 AIC) with #6 awg. wire.
When the motor kicks on (Briefly for 5 secs.) before the breaker trips, the voltage drops to between 215 to 208.
The building only has single phase to it.
The voltage drops even when bypassing ComEd's meter.
I am at a loss.
Your thoughts would be appreciated.