Problem with Jags stopping unexpectedly

[Daniel_LaFleur]

Originally Posted by wilsonmw04

Greetings,

I am hoping the CD community can help my team with a pesky problem that popped up at the VA regional.

symptom: A drive motor will stop moving. Jag light will switch from green to solid red. The motor will stay unresponsive until roughly half a second after the drive command has stopped. Then resume normal operation. When put on blocks, all drive motors function normally.

What we have done to try and resolve the issue:

1. Replaced Jag. no change
2. replaced PWM wire. no change
3. Swapped PWM wire to another working drive motor on the robot. Problem went to that new motor.
4. changed PWM port via code. no change.
4. replaced DSC. no change.
5. replaced ribbon cable between DSC and CRIO. no change.
6. uploaded code that was working perfectly Friday morning. no change.
7. replaced joystick. no change.

The we have three things we can check now.
a.Replaced the motor on the drive, but that seems unnecessary because of results of #3 on the list above.

b. Replaced CRIO. This is a shot in the dark. Everything thing else on the robot is working as intended.

c. Bad snap action fuse. This is what I am hoping for.


Does anyone have any insights to this problem? We have one last event this week and would really like to resolve this issue quickly.

Help is Chief Delphi. You are our only hope.

When you changed to a different motor, was that motor on a different gearbox?

It sounds like you are tripping the overcurrent in the Jaguar. To test upload the default drive code (not a previous version of your code as it may also have the bug) and run it.

It's very possible that somewhere in your code you are giving 1 motor (of a multi motor drive) a different speed command.