sparky*62,
In addition to the good advice already posted:
Check for possible ground faults with connected devices: motor, speed pot/input, switches or remote displays, etc.
Having said that, this sounds like an overvoltage problem on the DC bus. If you have a large overrunning load, (flywheel, large fan, etc) or anything driven with enough mass to pump too much emf back into the DC bus during decel this could be a problem. Most drives should be able to automatically handle this, by switching into a coast mode---the drive disconnects electrically from the motor and waits for the DC bus voltage level to drop before continuing the decel mode---or the drive should trip on a DC bus overvoltage. You might try changing the stop parameter to "coast to stop" if practical to see if the problem is linked to this.
Is this a fairly new "name brand" drive? I have had similar problems with some of the cheaper entries into the small hp drive market.
Len
