Re: [CAD_CAM_EDM_DRO] Phase converter circuit

While we are talking about it, I would suggest building a rotary converter -
if you find the parts used, it can be really cheap. I made one out of a 15hp
motor from an old elevator. The whole thing probably cost me $150, including
the 3-phase 220-to-440 transformer that is mounted on the side of it to run
VFD's. With the rotary converter, I get full output from the drives.

It works great... except...

Every time I turn it on, the high-pressure sodium and mercury vapor lights
in my shop go out, then come on a few minutes later. Does anybody know how
to reduce the starting current on one of these things? I built it so that it
starts itself, using a small timer to cut the start capacitors out when the
rotor come up to speed. Would it help to put a pony motor on it to bring it
up to speed first?

By the way, I got the capacitors for the converter from Hoffman Industries -
http://www.hoffind.com/. Mr. Hoffman has quite a selection of motor run
capacitors cheap.

Thanks -

Mark Ehle
Dowling, MI

----- Original Message -----
From: "Tim" <timg@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, October 17, 2001 3:55 PM
Subject: RE: [CAD_CAM_EDM_DRO] Phase converter circuit


> Just as a suggestion, a VFD is really the way to go. Will not cost all
> that much more than a motor for a rotary converter along with the
> magnetic switch, potential relay, power relay, caps, and case. More
> money than a static converter, but you get full power.
>
> Tim
> [Denver, CO]
>
> > -----Original Message-----
> >
> >
> > Hello All,
> >
> > Would anyone have a schematic or circuit diagram for a single
> > to 3 phase converter, using a voltage or current relay to
> > switch in the start capacitors. I know this is slightly off
> > topic for the group, but I know that there is a wealth of
> > this type of knowledge here.
> >
> > Many thanks.
> > Tom Csibor.
> > tcsibor@...
> >
> >
> > Addresses:
> > FAQ: http://www.ktmarketing.com/faq.html
> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
>
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