Pneumatic Help

[Avii]

We have done all of these steps based off of other post but it still doesn't work. We have check the wiring and it seems to be correct.

[Mark McLeod]

Does it always occur with the same solenoid?
Do you have other solenoids on the robot where it doesn't happen?
Do you have a different solenoid that you could try in case it's just the solenoid?

[Avii]

Originally Posted by Mark McLeod

Does it always occur with the same solenoid?
Do you have other solenoids on the robot where it doesn't happen?
Do you have a different solenoid that you could try in case it's just the solenoid?

We are using 6 solenoids on 1 pcm.

It does not happen on the same solenoids. It randomly switches to the ones that work and don't.

We have some spares we can try if it is the solenoids

[Mark McLeod]

Possibly, it could be exceeding the total solenoid sum of all channels draw of 500mA that makes it appear as if the fault is moving around to different solenoids.
One or more solenoids pulling more than 90ma could cause the trip I suppose.
Although I assume you are only ever firing 3 of the PCM solenoid outputs at the same time.

[Avii]

Originally Posted by Mark McLeod

Possibly, it could be exceeding the total solenoid sum of all channels draw of 500mA that makes it appear as if the fault is moving around to different solenoids.
One or more solenoids pulling more than 90ma could cause the trip I suppose.
Although I assume you are only ever firing 3 of the PCM solenoid outputs at the same time.

http://www.humphrey-products.com/pro...d-valve-series

This is what were are using is their a possible fix to this

[Mark McLeod]

That appears to be the problem.
If they are all on then those single solenoids will pull:
12v model = 333ma * 6=2000 ma
24v model = 167ma *6=1000 ma

Some possible solutions:
- Don't allow more than three or so solenoids to be energized at the same time in the code (might be accomplished by reversing some of the tubing directions, so that some go off as others get turned on)
- Add a second PCM to spread out the load
- Shop for or borrow solenoids that don't require so much energy.