Porter CCPL6025 Trips Breaker at cut off

by Dan
(Music, KY)

I have a Porter Cable CPL6025. It runs fine filling the tank till it reaches cutout, then trips the breaker.


You can drain the tank and reset the breaker. All is good till it reached 120lbs, then.. trips the breaker again.

I've read every post about tripping the breaker and it always involves at startup or filling the tank.

No motor hum no drag. it fills fast and great till cutout.

Why is this one the only one of thousands with this problem?

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Nov 16, 2016
Porter CCPL6025 Trips Breaker
by: Bill

If the pressure switch isn't arcing, then it's got to be a short in the capacitor wiring or the motor I would think.

I don't know if this motor has a centrifugal switch, but that might be it too.

If it's new, take it back and ask for another. Even though they aren't the most reliable of compressors, it should certainly last longer than this.

Nov 15, 2016
Porter Cable CPL6025 trips breaker at 80 psi
by: Lance

I just bought a used Porter Cable CPL6025, plugged directly into the outlet (no extension cord). Pump turns on at 90psi and cuts out at 120psi.

I used the compressor to run an impact wrench for about three hours over two days with no problems. The tank would deplete, the pump would turn on, bring the compressor back to 120psi, and then shut off.

But yesterday it started tripping the 15a breaker after 30-35 seconds of running. There is no other equipment from that circuit. Thinking the breaker might be weak, I tried the compressor on a separate 15a circuit, but it continued to trip the other breaker in the same way. Once it gets up to 80psi, the compressor runs for 30-35 seconds before tripping the breaker on either circuit.

I checked the oil, and it was beneath the recommended minimum level, so I topped it up. I drained the tank to 0psi. Once started, the compressor runs to exactly 80psi before again tripping the breaker.

I drained the tank and removed the check valve for cleaning. It had a bit of gunk on it, but nothing major. Once again, the compressor runs until exactly 80psi, then the breaker pops. At 80psi, once reset, the compressor can only get 30-35 seconds before the 15a breaker goes.

I took the cover off the pressure switch to see if I could observe a spark or bad connection when the breaker trips, but I couldn’t see or find anything out of order there. The unloader valve seems to be working exactly as it should.

Why would this problem only appear after two days of use? Any ideas as to the probable cause?

Oct 03, 2016
Switch did not solve problem
by: Bill

It's best if a clear understanding of how the compressor works is achieved.

If you haven't, I recommend you read the pages on this site about how the tank check valve works, how the unloader valve works, and how they interact with the pressure switch.

That your compressor unloader valve apparently bleeds air until the tank is empty or the pressure switch trips on cut in indicates a tank check valve problem.

If the tank is empty completely, does the compressor start without blowing the breaker?

Oct 01, 2016
Pressure Switch did not solve problem
by: Terry

The air compressor runs fine and builds pressure to 175 pounds and the pressure switch cuts out just as air starts coming out the small tube in the bottom of the switch that goes back to the tank.

I replaced the pressure switch thinking it was defective expensive replacement the problem still exists

when you try to turn the air compressor back on while the switch is bleeding out the air the motor hums and eventually blows the breaker

if you flicked the switch fast and frequent sometimes it trips the motor into working if you leave the switch on too long it will go again trip the breaker air still continues to bleed out until until it is out of air and in fact resets itself any help in this problem would be appreciated

May 12, 2015
CPL6025 Trips Breaker at cutoff
by: Bill

Nah, you aren't alone, Dan. Lots of compressors have had this problem.

Diagnosing the cause is a bit problematical, depending on your skills.

It could be caused by the pressure switch shorting out when the pressure level in the tank reaches that point. To check - if you can - pull the cover of the pressure switch, empty the tank, and watch inside the switch (careful - live wires) to see what you see when the tank pressure reaches 120. A spark or obvious short would indicate that it's time to replace the pressure switch.

More difficult to diagnose is if there's a short in the windings of the motor, or of another motor component. This type of thing is not usually pressure related... but you never know.

At this point, if this were my compressor and I could get a new pressure switch inexpensively (see the video on this site about my $10 air compressor for tips on that) then I'd start by replacing that and monitor the results.

Bill

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