14 years ago
400-440v inverter. Wired it in to the "real" output of the Transwave
transformer (ie single phase 415volt-ish). Looped the 3rd phase into
this. Runs fine until I try to run the lathe at top speed, at which
point it indicates an over current fault.
The conclusion is that a 5HP inverter wired in this way isn't up to
the job of a fully loaded 3HP motor in a CVA lathe - which is really
what Rob said in the original post.
A 7.5-10HP 3 phase 400-440 volt inverter should do the job - just
need to find one cheaply.