Hey guys, I’m having an intermittent drive issue with a Tac 50-04 I would like some guidance with. So what’s happening is, intermittently this drive will fault out with a 651 fault and won’t run until the drive is reset. The fault description reads as such:
Car fault: 651. VVVF current Regulator Hardware Error- illegal fault bit combination. Drops safety string via WDPF. Will not close safety string until given a manual reset request from the CPU or a DSP board reset. Red LED on DSP card will be on solid.
Sometimes it will run for a day, sometimes it won’t run at all before it will fault out. We have changed the current regulator board thinking that would fix the issue and it ran for about 8 hours then faulted out again, same thing. We have replaced the auxiliaries on the MC1 contactor, checked tightness on all the terminals. It’s got a VVVF regen drive 460VAC 60 HP drive installed currently. Any help would be appreciated.
