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Originally Posted by MikeDubreuil
Now that we know they were shorted. Kris Verdeyen mentioned a closed FET as a sign of static electicity. Is it possible your wheels are generating static electicity, and the high voltage made it's way to the wheel's speed controller's FETs? Also, what were the speed controlers connected to when they failed? Just the wheels or an arm or roller?
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Could be. I never heard reports of static discharge from the drive teams until Nationals (when we didn't have problems), but I'll ask them. I never encountered static when the robot was driven on the carpet before shipping though. This is a theory that could easily be tested at home when the robot gets back.
The controllers that blew were on both the drive and winch motors, I don't believe the arm (van door) controller was one of the victims.