Gunner Asch wrote:
Fortunately..most of my gear runs fine on this, with the exception of
the VFD on my Gorton mill. At times, it shows an over voltage alarm and
refuses to run until the voltage drops back down to under 246.

Ive called this to the attention of the local PG&E wanks..and they
simply shrug, send someone out to measure the voltage, confirm that
indeed its 252, blither a bit and then leave.

Before there were UPS's there were constant voltage transformers, the most
popular made by Sola. UPS's put out really crap AC, and are designed to
work with a switching power supply as a load.

Sola transformers were used with all sorts of things, there may be one that
fits your needs. I used them with computers that had linear power supplies,
but I think they will work with motors, it's worth checking out.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM