Robb B
Lifetime Supporting Member
From experience, I had a Siemens G20 VFD running an older 7.5 HP non-inverter rated motor. We got random F2 (Overvoltage) faults, to such an annoying degree that we created a 2x fault reset routine. A few months in, the motor packed it in. I'm betting that our motor was weak, and that the stresses of the VFD (High DC Bus spikes on the windings) caused it to fault the drive occasionally, why it registered as over voltage I'm not sure, but it definitely only happened when the drive was stopping. We put a new motor on there, and haven't had a single fault since.