Air Compressor not turning off.

[dumbuya]

Maybe some of you experience team out there has this issue.

We have a pneumatic setup everything work except that the
compressor is not turning off. The manual indicate somewhere that this year we do not need to include compressor control in the programming, the PCM should handle that.

Veteran teams out using pneumatics, what do you find to be true?
Is our problem a programming issue?

[MrBasse]

Do you have a pressure switch wired in?

[Christopher149]

Did you plumb and wire the pressure switch correctly? Does the compressor continue to run after the pressure significantly exceeds 120 psi (ie 130+ psi?). Is the compressor and pressure switch wired to the PCM?

[Jefferson]

It's almost certainly not a programming issue. Something may be wrong with the pressure switch. Have you verified it's functioning properly.

[orangemoore]

Can we get a picture of the setup of the wiring and everything else. We may be able to spot issues.

[dumbuya]

Originally Posted by orangemoore

Can we get a picture of the setup of the wiring and everything else. We may be able to spot issues.

This is a picture of our test. Hopefully you can make out the controls.
We might try swapping the pcm and see what happens

[dumbuya]

Originally Posted by Jefferson

It's almost certainly not a programming issue. Something may be wrong with the pressure switch. Have you verified it's functioning properly.

We swapped the pressure switch and found the same issue. We will try to
swap the pcm now and see what happens.

I will let you know tomorrow.

[dumbuya]

We ran the sample code and tested the cylinder and work fine. But we noticed the compressor is not turning off. The pressure switch and compressor are both wired in PCM.

How do we wire the pressure switch correctly? I understand that it is not polarized.

I will try to get in a pic for you. Any of you using pneumatics this year?

[dumbuya]

Yeah it was about 135 psi and didnt turn off.

[Gregor]

I second the request for wiring pictures. Did you try a difference pressure switch?

Originally Posted by dumbuya

Yeah it was about 135 psi and didnt turn off.

Your system should never allow you to get that high. Where was your emergency relief valve?

[Fletch1373]

Originally Posted by Gregor

Your system should never allow you to get that high. Where was your emergency relief valve?

The relief valve commonly doesn't bleed air until 130-135 anyway.

[cgmv123]

Originally Posted by Fletch1373

The relief valve commonly doesn't bleed air until 130-135 anyway.

It's required by the rules to bleed at 125 psi. If yours doesn't, you need to adjust it.

[ToddF]

We had this same problem today. We discovered that the newest version of the firmware causes this problem. We reflashed back to the previous version and the pressure shutoff switch now works properly again.

To troubleshoot, completely disconnect the pressure switch from the pneumatics module. This should cause the compressor to shut off. (Fail safe) If it keeps running, it's not the switch, it's the firmware.

[Ben Wolsieffer]

Ours is updated but we haven't tested it yet; I'll hook a compressor up it tomorrow and see what happens.

Also, has anyone from FIRST seen this thread, it looks like this might be a major problem.

[dumbuya]

Thank you to all for sharing your experiences with the PCM.

We swapped the PCM with a new one and it worked as expected.