Compressor trips out the reset button on the control box.

by Dean Fahner
(Sedgewick, Alberta, Canada)

When the compressor in our mechanical shop is used for a period of time it will trip out the reset button on the control box that is mounted on the wall beside it. Can I adjust the pressure switch or should I replace it? Should I increase the size of the overloads in the control box? Thank you very much!!


_________________
Bill says...

Hello Dean. Thanks for visiting and writing in.

What I don't know, and what is making it hard to give you an answer, is what the reset button on the control box responds to?

Often reset button are thermal overloads. When the motor temperature gets too high, they trip, and that cuts the power to the motor until the thermocouple cools down.

Is your reset button heat related, pressure related, or sensing a voltage issue?

Until I know that, I can't give you even a guess.

Sorry,

Bill

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Air Compressor labors before cutting out.

by Tex
(Sydney Australia)

Hi, on initial (cold) start-up the compressor sometimes works OK and reaches the nominal pressure although I've noticed that it now stops in the red band of the pressure gage.

But most of the time the twin V compressor starts up OK but starts to labor almost immediate and cuts out altogether.

Suspect there is a thermal overload that is cutting in as cycling the ON/OFF switch will sometimes allow the compressor to start up (and labor again) but most of the time cycling the ON/OFF switch does nothing (ie compressor doesn't work).

Once the compressor is left for a couple of hours (probably cools) the senario is repeated. Suspect the pressure switch, is there a way to confirm this? Cheers

____________________
Bill says....

And cheers back to you, Tex!

Here's a question: "reaches the nominal pressure although I've noticed that it now stops in the red band of the pressure gage." What is the "nomial" cut out pressure, and the red band you speak of, is that a higher pressure setting than the normal cut out? If so, I believe this points to a pressure switch issue.

But this... "the twin V compressor starts up OK but starts to labor almost immediate and cuts out altogether. " isn't the pressure switch, I don't think. If the pressure switch trips, power flows or is cut off. It's possible, but almost too rare to be accepted, that a pressure switch might somehow throttle the power to the motor to cause lugging. I'd look to a start or run capacitor for this symptom, assuming that the motor is in good shape.

Cheers,

Bill



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Apr 22, 2011
Additional Troubleshooting
by: Tex

Hi Bill,
Appreciate the quick response! Did some additional troubleshooting last night. I removed the shut off ball valve which would then allow the compressor to run without building up any pressure and found that the compressor started up properly and kept running until I turned the power off. Suspect pressure switch?

With reference to the red band, unfortunately I cannot give specific values as I never really paid too much attention when the compressor was working properly. But, I can vaguely recall the compressor would pressurize tank to about 120kpa which on the gage was the start of the red band. On the rare occasion when the compressor runs I found that the compressor would not shut off at approx. 120kpa but would continue to run beyond 120kpa (into the red band) until I manually shut it down.

For reference, the compressor is about 8 yrs old and sees occasional use only for hobbies is I would assess it in very good condition (until now!).

Question about pressure switches, are ther repairable or would you recommend replacing? Cheers

_________________
Tex, I don't know of anyone that repairs pressure switches. At a cost of about $25 new, there's not much in that for parts and labor for a repair. It were me, I'd be buying a new one.

Bill


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Bauer Rotary Screw Compressor over heated

by robert
(North hollywood, CA.)

I currently own Bauer Rotary Screw Compressor 30HP made in 1989.

When I start the compressor, the pressure rapidly increases, causing the air inlet valve fully open.

And I came across a problem with air inlet valve malfunction. The air valve does not close on cut out point accordingly. It is to stop at high temperature limit of the compressor, which is 250F. The problem is that the solenoid does not cutoff at 110 PSI, cut out point.

In the past, the air valve closed and opened atomatically by the load.

Please let me know what I have to fix.

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Eagle YL90L2 - Air compressor pressure

Gday,
I have an Eagle YL90L2 3.0Hp 50Lt compressor and want to know if I can adjust anything to keep the output at a certain pressure. Example: My compressor charges up to around 110psi and then after discharge kicks in at around 80psi. Can i change it to kick in around 90psi?

Many thanks

shaneem@internode.on.net

____________________
Bill says...

It is the compressor pressure switch that tells the compressor when to start and stop, based on it "sensing" the pressure in the system.

It is the engineers that designed your air compressor that determined the optimal cut in and cut out levels for best use, longer time between components failures and so on.

If you adjust the pressure settings via the nut on a thread inside the pressure switch, you do so at your own risk.

Cheers,

Bill

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