So my 3-phase Komo spindle was powering through a heavy cut when I heard it falter and then stop. Attempting to restart it failed - it fires up for a second and then quits with this "low voltage on bus" error. Evidently something died; but was it the spindle or the VFD? Without having a spare of either one, how can I tell? Or is there some simple fix? Could this be caused by voltage fluctuations in the supplied power? I tried Googling for solutions, but nothing I read said much more than the obvious ("this is caused by a low voltage condition...")