Re: [CAD_CAM_EDM_DRO] VFD / phase converter

They use 2 lines for the computer and 3 lines for the motors.
Darrell
http://www.machinemaster.com

----- Original Message -----
From: D.F.S. <dfs@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Friday, March 10, 2000 10:53 AM
Subject: Re: [CAD_CAM_EDM_DRO] VFD / phase converter


> From: "D.F.S." <dfs@...>
>
> >
> > 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
>
>
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