ingersoll rand air compressor popping breaker

by david
(whiteville nc )

Ingersoll Rand 7.5 HP 80 gal 230 V 1 Ph Vertical Air Compressor

Ingersoll Rand 7.5 HP 80 gal 230 V 1 Ph Vertical Air Compressor

its a ingersoll rand air compressor with a 7.5 hp elec motor and a 2475 pump


We have put a brand new elec motor on it and it still pumps up normally at first then when it cuts back on it will run for about 10 seconds and pop the breaker.... it seems that the pump is seizing...

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Oct 01, 2014
Ingersoll Rand unloader valve
by: Bill

David, please see the unloader valve page if you have any question about what they do and how they work.

If your unloader valve is not working properly, the symptoms your compressor is undergoing can be caused by a faulty unloader valve.

That your air compressor starts normally from zero tank pressure (meaning that all air over the pistons is gone to ) and does not start properly with air in the tank, points to an unloader problem as well.

Once you resolve that the unloader valve is working properly - by replacing your failed one I expect - then Doug's advice about tear down and valve function is advice you follow next.

Bill

Sep 30, 2014
unloader
by: David

I releaved the pressure by pushing up on the needle of the unloader.... it was not working properly, i had to move the screw down to get it to function normally..... it runs fine if i take the pop off valve at the tank out and let the compressor run free,,,, it then will not drag or pop the breaker....also this is the second electric motor we have installed the first on was rebuilt and the one on it now is brand new and they both are doing the exact same thing...

Sep 30, 2014
check valve
by: Doug in s.d.ca

OK, right, there is no other check valve.

Looking at the pump diagram, it has two sets of finger valves in each piston head - a set for intake and another to act as a check valve.

So, if all else fails you may need to tear it down to check them, but you can probably tell by just removing the connector tube. the big side should push, but not create vacuum (suck). The little one should suck, but not push air.

Sep 30, 2014
releave the pressure through the unloader valve
by: Bill

David, how did you relieve the pressure through the unloader valve? Is it possible that you relieved the tank pressure using the pressure relief valve instead of the unloader? Are you certain that the unloader valve is working properly?

Are you saying then, that even if there is no pressure in the tank at all, that the compressor stalls after a few seconds?

That being the case, did you check the capacitors?

Bill

Sep 30, 2014
check valve
by: David

I replaced the check valve on the tank.. i cant find any other check valves.. and the unloader was not working properly, but i did releave the pressure through the unloader valve and then when it cut back on it did the same thing and popped the breaker.

Sep 30, 2014
popping breaker
by: Doug in s.d.ca

OK, that's progress, anyway.

Is there another check valve? I dunno which one you found bad, but if one was bad and there's another, it's probably bad too. Either between heads, or at the tank.

If no other check valve, then look at the unloader.

Sep 30, 2014
check valve
by: david

I replaced the check valve but its still popping the breaker when it comes back on at cut in pressure. The check valve was bad thoe.

Sep 24, 2014
check valve
by: Doug in s.d.ca

...and when I wrote my last, I forgot that's a two stage, so it could also be a check between the heads...

Sep 24, 2014
popping breaker
by: Doug in s.d.ca

Have you checked the check valve at the tank?

I think you'll find you can start from an empty tank to whatever the cut-out is all day long, but if you let it come on at cut-in pressure, it'll pop the breaker.

Classic.

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ingersoll rand 60 gal 5 hp motor hums and then wont start

by james
(michigan)

ingersoll rand 60 gal 5 hp 220 sinlge phase runs but after a fill cycle the motor hums and then wont come back on for 30 mins or so

ok so I got this Ingersoll rand 60 gallon air compressor and I recently had a heavy jack run across the extension cord I made to go to the garage and it tripped the circuit breaker in the house. so I went out and bought new 10-2 solid copper wire the same as I had before only this time I bought the stuff with the bendable metal covering.

I also changed the plug end to the bigger 3 prong as I just got a welder for Christmas so since I had to change the wire because of the miss-hap with the wire being ripped apart so I change the receptacle to the 3 prong that would accommodate my welder as well.

now the compressor will run thru a cycle to fill the tank with no problem but when the next cycle gets ready to start the motor will hum and then the safety switch kicks,

now me being some what a diy I checked all the wires and im getting 110 at each prong from the house and 220 touching both wires on my multimeter, so I did some looking inside the motor and realized it had no ground wire from the motor to the pressure switch so I did that thinking that would help but its still doing same thing.

I use the compressor to work on cars so using the air ratchet uses more air and the compressor goes on and off frequently.

im really no pro at this 220 motor but it has worked fine for over 2 years and now its giving me the flux its on a 30 amp circuit breaker but it never gave me this problem before

please help as im really unable to go back to wrenching by hand if you need other info please let me know and I will provide also the side of the motor does get hot but not so hot that it will burn you if you touch it

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Aug 28, 2014
Humming IR compressor
by: Bill

James, see the page on this site about checking capacitors, and check yours.

Please add a comment here letting us know if this was the issue.

Bill

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