Control System Anomaly

[twiggzee]

We have a simple robot with nothing other than a 4 motor direct drive mecanum wheels system on it. a couple of strange things are happening.

1) it drives faster backwards than it does forward. i doubt it is a code issue and all the wiring seems sound. we can't figure out why this is happening? these are jaguars that we got 2 years ago, perhaps they need to be calibrated if that's even possible? if so, how do we do that?

2) when we are driving at a fast speed (anything more than 30 or 40% power) forward and then suddenly switch to backwards, the robot dies. Meaning, we lose all control through the drivers station, the robot just stops moving. We don't lose connection or anything. When we disable and re-enable it works again.

There is no other programming than the simple mecanum drive code. Any ideas on where else we can troubleshoot?

Thanks!
Wendy
3502