It's a feature of the inverter
Dominic Greco in Richboro PA
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You wrote:
"It finally restarted. It took a long time. Could that suggest a problem with the inverter?
Is it all right to punch the reset or start buttons on the inverter? The tech didn't seem to know."
That long time between starts is a feature of the inverter. Would you rather that the lathe try to start back up when in a jammed condition and blow out the motor?
From your description of the scenario that resulted in the jam, it sounds as if you might be taking too big of a "bite" with the gouge. Or it may have something to do with the cutting edge. Have you checked to see if he gouge you're using is sharp? One of the most dangerous tools in any woodworker's arsenal is a dull one.
As others have suggested, I would most heartily recommend reading the manual that came with the lathe, as well as the manual for the inverter. Having such a source at hand will help you to speedily resolve problems such as the one you encountered without having to resort to waiting for an answer here.
I'm sort of amazed that Powermatic didn't include a manual for the inverter along with the lathe. Jet supplied a thick manual for the inverter that came with my Jet JWL-1642.