Compressor Issue

[midway78224]

Sorry i could not answer sooner.

We have the spike on a 20 amp fuse on the PDB.

We also done the short out test to the pressure switch with a screwdriver and it works but does the same thing as if it was shorted out. The spike goes green then orange over and over til it hits 120 psi and then stops. We are going to try adjusting or replacing the relieve valve as soon people i have spoken to have sugguested that this may be the issue. We are going to try this on Sat. at our meeting. I will update if this doesnt work.

[kevin.li.rit]

What compressor are you using?

[midway78224]

the newer small compressor

[DonRotolo]

Originally Posted by midway78224

The light on the spike goes green then orange green then orange all the way up to 120 psi. Same thing on digital sidecar

Originally Posted by midway78224

We also done the short out test to the pressure switch with a screwdriver and it works but does the same thing as if it was shorted out.

The sidecar light says the code is turning the compressor on and off. It is not a problem between the cRio and compressor.
The shorted switch test shows that the switch is not "bouncing" as suggested by Vikingtech2054. Verify wiring is OK by shorting the pins at the Digital Sidecar. If you get the same behavior, the problem is not between the switch and the digital sidecar.

Check (replace) the 37-pin cable between sidecar and cRio. If this is OK, then the issue must be in the cRio

This would mean, 99.999%, that it is your code that is turning the compressor on and off until it reaches 120, which then shuts it off properly.

Try the sample code Jon Stratis suggested, or write your own, but your code is the issue.

It is much less than 0.001% chance, but the cRio or digital module can be bad, but this is extraordinarily rare.

That covers 100% of the possible failure scenarios.

[midway78224]

Originally Posted by DonRotolo

The sidecar light says the code is turning the compressor on and off. It is not a problem between the cRio and compressor.
The shorted switch test shows that the switch is not "bouncing" as suggested by Vikingtech2054. Verify wiring is OK by shorting the pins at the Digital Sidecar. If you get the same behavior, the problem is not between the switch and the digital sidecar.

Check (replace) the 37-pin cable between sidecar and cRio. If this is OK, then the issue must be in the cRio

This would mean, 99.999%, that it is your code that is turning the compressor on and off until it reaches 120, which then shuts it off properly.

Try the sample code Jon Stratis suggested, or write your own, but your code is the issue.

It is much less than 0.001% chance, but the cRio or digital module can be bad, but this is extraordinarily rare.

That covers 100% of the possible failure scenarios.

We will try out all this tomorrow at our next meeting. Thanks for all the help.

[Jon Stratis]

Don't try my code above - that was an example of what could be causing your problem. Instead, you should have code like this:

If (pressureSwitch)
{
    Relay.set(kForward);
}
Else
{
    Relay.set(kOff);
}

Note the difference between this and the code I posted above - above, the code would stop it, then start it every single time we read the value of the pressure switch. With this code, it will either star it or stop it, but can never do both at once.

[midway78224]

I will give this code to our programmer and try it with the other sugguestion. I will post result tommrrow