Posted By: Jaymmorris
Tac 50 04 acvf drive problem - 12/22/15 10:37 PM
Fairly inexperienced on these units. I intermittently get a 643 fault- drive bus undervoltage. It will run about a week or two then shutdown. Bus rectifiers, igbt s, qss interface, current regulator are good. That's about all I've done at this point. Any tips would be greatly appreciated