Problem with Jags stopping unexpectedly

[Nuttle89]

Originally Posted by Electronica1

We are running 4 VexPro jags, and we tried to switch to a brand new jag fresh out of the box and the problem persisted.

IIRC, even brand new Black Jags ship with the old firmware. I think we had a student flash all of ours with v107 when they first arrived. While updating the firmware might treat your symptom and allow the Jag to function normally, it sounds like you may have some mechanical fault in that module.

I'd recommend swapping the motor leads (post-Jag) and see if the problem stays with the physical motor to diagnose this.


OP, with #3, are you saying you took a PWM line going into the Jag, put it in a different Jag connected to a different mechanism, and that new Jag had the same problem? In that case my best guess would be that you're doing something odd in code like rapidly reversing the motor - this could cause Jags to current fault or otherwise misbehave.

If you do go to the trouble of updating the firmware, the good news is that you can read diagnostic info from the Jag via the BDC-Comm utility. You can manually drive the motor at varying voltage and watch for temperature or current spikes. If you have the cables lying around or can make them, having access to this can be helpful for diagnosing stubborn Jags.