Question about Ingersoll Rand UP6-30-125 120 Gallon Rotary Screw Air Compressor, 30 HP, 125 PSI, 125 CFM

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Compressor short cycles during operation. (load / unload). hose to guage and pressure switch ok. what could be the problem?

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  • sbxcheng Sep 06, 2009

    Thanks for the post. The compressor had been working fine. Installed new pressure switch and reset Hi and Low settings. Seems that air is leaking back to the oil manifold block somehow as the pressure guage / pressure switch line drops off quickly when it unloads. The manuals that we have are pretty useless from IR. We suspect that there is a shuttle valve leaking by in the discharge valve block (has air oil separator and oil filter attached to it), although the manual does not show any kind of cut away view. We are taking it off to check it out. Wish IR had better manuals. I'll let you know what we find. thanks alot. Ron

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The pressure switch has an adjustment for the low pressure cut in and the high pressure cut out. If the pressure range is set too close the cycles will be short. You need to work out which setting is wrong by looking at the pressure guage when it is cycling and adjust the pressure switch accordingly.

Posted on Sep 06, 2009

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Ingersoll Rand 3 hp air compressor builds correct pressuse but trips rest when called to restart. Changed starter and running capasitors but no change in problem.


You need to check the head unloader.
Compressed air that is trapped over the piston when the compressor shuts off will be evacuated to atmosphere through the unloader valve, to prevent that compressed air pressure from adding load to the start up of the compressor motor, when the pressure switch again calls for air. For example, the last time you did a sit-up, you may have folded your arms over your chest, or if you are particularly masochistic : - ) , even held a weight to your chest. What you were doing is increasing the load against which your muscles have to work to effect the sit up.
Compressed air, captured in the cylinder after the compressor shuts off, would increase the load against which the electric motor would have to work. It may increase the load too much, and the motor may fail to start, or it may pull too many amps and fry a fuse or pop a breaker in the panel.
When the compressor shuts off, the unloader valve operates, it unloads the trapped air to atmosphere, and that problem is solved.
The unloader valve is plumbed somewhere in the line between the compressor and the compressor tank.
It is often part of the pressure switch assembly. It will, in many cases, be opened by the pressure switch, when the air in the compressor air tank reaches the set point and the pressure switch trips the power supply to the motor off, and at the same time, trips the unloader valve to open.

it is normaly on the bottom of the pressure switch it will have a small tube hooked to it



1_4_2012_7_59_34_pm.jpg

Jan 04, 2012 | Air Tools & Compressors

1 Answer

Compressor builds correct pressure but will trip rest before it can restart.


You need to check the head unloader.
Compressed air that is trapped over the piston when the compressor shuts off will be evacuated to atmosphere through the unloader valve, to prevent that compressed air pressure from adding load to the start up of the compressor motor, when the pressure switch again calls for air. For example, the last time you did a sit-up, you may have folded your arms over your chest, or if you are particularly masochistic : - ) , even held a weight to your chest. What you were doing is increasing the load against which your muscles have to work to effect the sit up.
Compressed air, captured in the cylinder after the compressor shuts off, would increase the load against which the electric motor would have to work. It may increase the load too much, and the motor may fail to start, or it may pull too many amps and fry a fuse or pop a breaker in the panel.
When the compressor shuts off, the unloader valve operates, it unloads the trapped air to atmosphere, and that problem is solved.
The unloader valve is plumbed somewhere in the line between the compressor and the compressor tank.
It is often part of the pressure switch assembly. It will, in many cases, be opened by the pressure switch, when the air in the compressor air tank reaches the set point and the pressure switch trips the power supply to the motor off, and at the same time, trips the unloader valve to open.

it is normaly on the bottom of the pressure switch it will have a small tube hooked to i

1_4_2012_8_01_50_pm.jpg

Jan 04, 2012 | Air Tools & Compressors

1 Answer

HIGH TEMP ALARM, UNLOADING AND THEN LOADING OVER AND OVER.


Please check your cooling system including the oil. It may time to replace the oil.
Also please check and set your load - unload pressure to wider range to prevent load-unload in short cycle.

Regards, Jay

Apr 26, 2011 | Eaton 1" Air Compressor Check Valve

1 Answer

Compressor UP6 25 125, runs all the time but is only under load for a short time, should it shut down between loads?


This unit will shut down if unloaded for a set period of time. Usually 5 to 10 minutes. This time could be longer if some one has changed it from the factory setting. There is a timer in the control box that starts counting down when the unit unloads. If it stays unloaded long enough for the timer to count down the unit will stop until the air pressure drops to the low set point on the pressure switch. It will then start up. If the unit loads before the counter counts down the timer starts from the beginning when it unloads again. This cycle continues until you manually shut it down or you stop using air long enough for the timer to reach Zero and shut down.

Apr 22, 2011 | Ingersoll Rand UP6-25-125 120 Gallon...

1 Answer

My compressor builds to 125 psi then shuts off like it should then when the pressure is released the compressor wont start back up. Sometimes it will attempt to start and it sounds like the motor is...


When a compressor reaches set pressure, there should be a release of air from discharge hose thru the unloader. This release of air unloads the compressor head pressure. The unloader is usually located within the pressure switch. Easy to check. Follow discharge hose from compressor head to tank. There should be a brass/steel checkvalve at the tank. The checkvalve allows air to enter tank, however not allow air to be released back into discharge hose. If this valve is leaking, air will be released from the unloader constantly. Follow 1/4" tubing from checkvalve to unloader and listen for leaks. Repair as needed. If air is not leaking from checkvalve then check unloader mechanism with-in pressure switch. Parts are available at www.toolpartsdirect.com Good luck

Aug 25, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Need a point setting for ao smith air compressor ac motor model number opa-0297 s# c56b72b2316508j2 work on air machine with motor installed motor will hum and trip breaker can we set points to stop trip...


There is not a point setting for air compressors. The pressure switch can be adjusted. Remove the cover from the pressure switch. Adjust the nut tighter for a higher cut off pressure or looser for a lower cut off pressure. It sounds like the compressor is trying tostart under load. If the unloader valve is not working, the compressor will draw excess amperage and do what you describe. The unloader valve releases the pressure in the cylinder at the end of the run cycle so the compressor can start the next run cycle under no load.

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1 Answer

Craftsman 1 HP 8 gal vertical compressor.919


Sounds like the unloader valve is not working properly. The unloader typically is at the end of a tube going to the pressure switch. The unloader is tripped when the pressure switch cuts off. The purpose of the unloader is to bleed the pressure from the cylinder when the compressor cuts off so the next time the compressor cuts on it will be starting in an unloaded condition.
when the compressor cuts off you should hear a discharge of air for about 3 to 5 seconds if the switch is working properly. The unloader can be adjusted if necessary by loosening the jam nuts and adjusting the unloader towards the lever on the pressure switch.

Apr 05, 2010 | Air Tools & Compressors

1 Answer

Dayton air compressor to much head pressure to restart


Head pressure is caused by a malfunction of the unloader valve at the pressure switch or leaking checkvalve at the tank. Follow the discharge hose from the head to the brass valve at the tank. The brass checkvalve allows compressed air into the tank and not return to pump. Also connected at the checkvalve is the 1/4 airline to the pressure unloader at the pressure switch. This unloader releases the air in the discharge hose when the cycle completes. Look/listen for a release of air which lasts only for a moment after cycle at the pressure switch. Some pressure switch unloaders look like a tire stem valve with a small mechanical arm to activate pin. To check for faulty check valve at the tank, with air in tank remove the 1/4 line at the checkvalve and l look for leak. If leaking replace valve. Check valves and pressure switches are available at www.grainger.com. You can use generic parts instead of factory to save money, just pay attention to thread sizes. Good luck with you repair and email if you have questions.

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1 Answer

Makita MAC2200 runs fine (with new Manifold Switch and repaired power cord) but there is an air leak under the new manifold switch that seems to be a feature of the switch. When set to automatic, the...


I have worked on many makita compressors and have run-across this problem on a few of them. Your compressor has a check valve that is supposed to hold tank pressure after the switch reaches set pressure. There is an unloader valve built into the pressure switch that releases the pressure in the discharge hose after the unit shuts off. The unloader allows the compressor to restart with-out any pressure in the discharge line. If the brass check valve is leaking pressure back into the system, air will leak out of the unloader valve. Follow the discharge line to the tank and you will see the brass check valve. To test valve for fault, run the compressor till it builds around 80 psi and unplug the unit from the wall outlet. Remove the 1/4" hose connector from the check valve and check for air leaking out of the valve. If it is leaking you can order form www.toolpartsdirect.com. or call the makita 1-800 number. The price is about the same. Good Luck on your repair.

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1 Answer

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All electric compressors share a basic design with ac power pressure switch with unloader and checkvalve between the pump and the tank. When the pressure switch powers off, it unloads the compressor by releasing the air in the discharge hose. You will notice a small tire stem pin and a lever to engage it somewhere on the pressure switch. If the compressor stops before reaching set cutoff point, the air pressure remains in the discharge hose not allowing the motor to start, thus the hum you hear. Solution is to check for the proper function of pressure switch /unloader, tank check valve (if check valve leaks air back to compressor it will load motor causing hum) and extra measure check capacitor for at least 90% of rated valve. Finally, do not run this compressor with an extension cord, use more hose instead. enjoy

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