Yes, heat is an issure.. the whole thing is used in a hot environment in an already hot climate.. Southern Cal.. you know.
My gut instinct jumped to isolation transformer, but I need to back this up with some reason and logic before spending
the money on an ultimate solution. L-G leakage is a possibility, but I'll have to chase it down. There was nothing wrong
with the setup that was visually apparent. The things in pretty good shape. My mind went to N-G problems first. None of the
taps in the autotransformer is directly grounded. That would be crazy in a cord-connected device. I already see some cords
around the place with the ground pins snipped off (for whatever reason..). I'll look into the VFD as the culprit.. that didn't
occur to me, the focus of my thinking was always on the autotransformer. Guess I needed to take a few steps back from the
problem, which was why I posted in the first place.
