Re: [CAD_CAM_EDM_DRO] VFDs and rotary phase converter

Unterhausen Umberto wrote:

> Carlos and Fitch were discussing VFDs and rotary phase
> converters.
>
> VFDs have trouble using single phase because of two
> factors: the size of the input diodes and the ripple
> voltage. However, if they have implemented some sort
> of phase checking for current draw, then you are out
> of luck with either the rotary converter or direct
> connect because you will get a phase fault.

Most modern (ie. 1990 or newer) VFDs will run fine on single
phase, at least up to 10 or 25 Hp. Larger (50 HP and up)
may have more sophisticated protection circuits.

Jon