Re: [CAD_CAM_EDM_DRO] VFD / phase converter

The problems with phase converters result from them not being properly
balanced with capacitors which causes the generated leg voltage not only
being too high, but it will also drop very low when a sudden load is
applied.
Most problems can be avoided if the electronics on the machine are powered
by the 220 volt line and the third phase is only on the motor that is on the
machine.
Darrell

----- Original Message -----
From: Drew Rogge <drew@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Friday, March 10, 2000 9:27 AM
Subject: 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?
>
> Drew
>
> > From: Charles VanLeeuwen [mailto:cavlon@...]
> > Sent: Friday, March 10, 2000 10:45 AM
> > To: CAD_CAM_EDM_DRO@onelist.com
> > Subject: Re: [CAD_CAM_EDM_DRO] phase converter
> >
> >
> > From: "Charles VanLeeuwen" <cavlon@...>
> >
> > My personal experience with solid state variable frequency inverter
drives
> > used as phase converters is that they are less expensive, less noisy,
and
> > more efficient than at least some commercial rotary phase converters.
> >
> > CVL
>
> --
> Drew Rogge
> drew@...
>
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