On Tue, Jan 4, 2022 at 12:00 PM Adrian Stoness via cctalk < cctalk@classiccmp.org> wrote:
> you can use a vfd drives to get 3phase power from single u just gotta size > them bigger then the load u would normally need > > Yes, in principle this is true. In the simplest case, the VFD input is just a 6 diode full wave rectifier into a capacitor. BUT things like power factor correction on modern drives means the input circuit is a lot more complex. Usually the small VFD will be designed for single phase power or 3phase power and the derating is done for you. Using a 3phase drive on single phase typically won't work because the drive will detect a phase loss and shut down. I know for one Rockwell drive there was an internal hack that allowed it to work on single phase so the sales people could plug into a 120vac outlet. Chuck D.
