On 3/4/23 14:08, gene heskett wrote:
Yup, I agree with Gene, if the motor was not spinning AT
ALL, but the VFD or motor was making a whining sound, it may
mean the VFD was only powering one phase winding.
That would indicate a VFD failure. Did you unplug anything
while waiting for it to cool? Maybe there was a bad
connection. Anyway, either a failed winding or a failed VFD
would be fairly unlikely to just recover on its own, so
that is odd. I did have some brushless servo drives on my
pick and place machine give crazy failures but then start
working OK after a power cycle. Eventually, they failed
outright. My guessed diagnosis was the firmware ROM was
going out, and eventually it caused a power on self test
lockout.
Jon
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