Re: VFD question

Guys,
The VFD I have feeding power to my Enco mill, is wired directly
into the original switch, which has 2-speeds forward, and 2-speeds in
reverse. I hardly ever touch the speed controller on the VFD, and
this setup has been running like that for about 1 1/2 years.

Marv Frankel
Los Angeles

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
> metlmunchr wrote:
>
> >Obviously if you're feeding in single phase power, the reversing
> >starter would have to be on the leaving side of the VFD. Where
> >should it be if you're feeding the VFD with 3 phase power?
> >
> >
> No, you don't need any reversing starter, and the VFD makers
strongly
> discourage using one. Any VFD can generate the 3-phases in forward
> or reverse sequence, thereby reversing the motor electronically.
>
> Most modern VFD's under 100 Hp don't care about the phase sequence
> of the input power. They just turn it to DC, and then create the 3-
phase
> output from that.
>
> Jon