Schindler Miconic A with VFAC Drive. KSD Drive fault (DS1), and Overcurrent fault (DS4) on VEC board. Attached to the VEC board are 2 LEM current modules, a ground fault detector and the device overcurrent circuit which goes to the V2V board and then presumably the drive. VEC faults out immediately when trying to run the car in either direction, before the brake picks. LED on the TWR board goes out on one of the drive boards. After about 20 seconds the fault resets and M1 contactor energizes. Does this indicate a bad drive board? How do I test the over current devices to ensure they are working correctly?

I recently had a miconic ssdc that was dropping the kinvon signal intermittently because of a bad drive pcb. Real pain to track down. Got parts from another office doing a mod.