Re: [CAD_CAM_EDM_DRO] VFD / phase converter

>
> From: Drew Rogge <drew@...>
>
> First I would like to thank everyone for answering my question
> about which wires to connect.
>
> I seem to recall reading in some catalog (J&L I think) that
> the warrenty on a Jet mill with a DRO install would be voided
> if a certain type of phase converter was used. I thing that
> the type they didn't want used was a static converted. I also
> seem to recall that there can be problems with some NC machines
> when used with the wrong type of converter. Has something to
> do with deriving single phase power from the 3 phase to drive
> the electronics. Has anyone ever heard any thing about this?

I don't know about CNC controllers as such, but I do know it was
and maybe still is common for large 3 phase computer eqpt to
only use 2 of the 3 phases, I don't know why.

Marc