Martin Eastburn fired this volley in
:

Was the motor shorted ? is there a shorted winding and just sat there
in a stall current to long ?

Think of the SYSTEM LLoyd - not just the source. You might buy 2 or 3
VFD's yet.

Now if the VFD is turned on with the motor disconnected, there might be
another issue. And so forth.

All those things were checked, or known as dangers. The motor's not
shorted, not binding, and was not cutting _anything_ when the VFD failed;
wasn't even running.

The VFD was OFF prior to the failure. This failure occurred on power-up
of the system. The spindle motor was never commanded ON before the
internal fault code of the VFD was thrown. No smoke came out, either.

Oh... to the other respondent who suggested testing the VFD's filter caps
"at voltage", instead of a meter voltages -- yeah... did yesterday, just
to confirm. A) none of them look 'leaky' with a good DVM, and they all
were charged on power-up, so the rectifiers are working, too.

I've already got almost 1-1/2 hours trouble-shooting into this. If I
waste any more time on it (except perhaps 'hobby time' down the road),
I'm busting my own billing rate. It doesn't make sense. Seven hours of
f'in with it would cost me more in lost billing than a brand new VFD
costs!

New one gets here day-after-tomorrow.

L

Please...