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Message: <blockquote data-quote="Mad Professor" data-source="post: 3978865" data-attributes="member: 5316">Yes, by using the VFD simply as a phase converter. But you loose all the functionality that the VFD that makes it so much better.  you might get by with slight frequency changes, but I imagine all of the controls/relays you have now are using a single phase 120/240 coils. So you wouldn’t want to change the frequency more than 10-15% +-.   You could run the controls off the single phase input supply to get around some of that. But once you start rewiring, I’d go all the way.</blockquote>