Air Compressor not turning off.

[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.

[dumbuya]

Originally Posted by 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.

It could be the firmware. Is the working firmware the 1.6 version? How would get to a previous version?

[Christopher149]

Originally Posted by dumbuya

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

We plan to be, but we probably won't have the system in a testable state for about a week.

[MrBasse]

Do you have a gauge to check the pressure? If it is over 120 something is wrong. If you have a leak it might never get to 120. Or if you have a rediculous amount of storage it would take a while to reach full pressure.

Ours ran, filled up, and shut off just as it should

Edit: try another pressure switch or double check the connections on the pressure switch. If wires are shorted it will continue running. Look for loose strands at the PCM connections.

[dumbuya]

Originally Posted by MrBasse

Do you have a gauge to check the pressure? If it is over 120 something is wrong. If you have a leak it might never get to 120. Or if you have a rediculous amount of storage it would take a while to reach full pressure.

Ours ran, filled up, and shut off just as it should

Edit: try another pressure switch or double check the connections on the pressure switch. If wires are shorted it will continue running. Look for loose strands at the PCM connections.

Yes we did and it is over 120 psi. We have one tank onboard.

[orangemoore]

Originally Posted by dumbuya

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

We haven't decided yet. We were about to get pneumatics working today but we couldn't connect to the robot to test.

[dumbuya]

Originally Posted by orangemoore

We haven't decided yet. We were about to get pneumatics working today but we couldn't connect to the robot to test.

Sorry to hear that. What seems to be the issue?

[orangemoore]

Originally Posted by dumbuya

Sorry to hear that. What seems to be the issue?

Were not entirely sure. I haven't had a ton of time to dive into all of the documentation so I have been going off prior knowledge.

We have set up our control system and router correctly (we think). But when we try to connect to the D-link the computer says it is connected to the network but the driver station says it isn't.

I have a feeling if I look at the documentation I may figure out what I'm missing.