Thermal overload shuts compressor off when used heavily

by Jim Smith
(Raleigh, NC)

IR 2340 compressor

IR 2340 compressor

IR 2340 compressor
IR 2340 compressor tank info
IR 2340 compressor motor plate

I have a IR 2340 compressor with 60 gal tank and 5 HP 230 V motor.


When I use it heavily, the thermal protection on the motor trips and it takes a long time to cool down enough to use again.

IR said that the duty cycle is 6-7 starts per hour.

A friend said that the most heat comes from the starting and that putting an unloader on would allow the motor to run continuously, avoiding the problem.

First question, is this correct?

Second, if so, what parts do I need?

Third, would it make more sense to add a second tank to reduce number of starts?

Comments for Thermal overload shuts compressor off when used heavily

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May 19, 2018
overload
by: Doug in s.d.ca

"It trips out after 7-10 starts in say 45 minutes to an hour."

So, according to what IR said, you do overload it. Running the motor continuously might have enough cooling effect to keep it from tripping.
A separate box fan might have the same effect. Possibly a secondary tank would work, although that means longer run times between starts.

I think it's worthwhile to check the capacitors, still. Then maybe try one or another or some combo of the things mentioned. Continuous run being the last thing, IMO.

Good luck, keep us posted please.

May 19, 2018
Check compressor caps
by: Bill

https://www.about-air-compressors.com/testing-capacitors.html

May 18, 2018
Overload shuts compressor off
by: Jim

How do I check capacitors?

It’s about 12 years old, I’ve had it about a year.

It trips out after 7-10 starts in say 45 minutes to an hour.

May 15, 2018
Compressor thermal overload
by: Doug in s.d.ca

Have you checked the capacitors on the motor?

I'd verify those before anything else.

Is this new, or older but new to you?

How many starts is it doing under the overload condition?

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