Re: [CAD_CAM_EDM_DRO] Rotary vs. Static Phase Converters

In a message dated 4/6/01 10:50:56 PM Eastern Daylight Time, JanRwl@...
writes:

> > Can I run the turning centers
> > (10 hp motors) with a static converter or do I have to use a rotary
> > converter.
> >
> >
>
> Scott: I have read, and BELIEVE it, that you can use a static converter
> ONLY
> for whatever size load for which it is designed. That is, not two or more
> motors, where one or more might be switched on/off while others run, etc.
> Most static converters do not really give you "real" 3-phase (not al-three
> phases exactly 120° out of phase with one-another), but "rotary converters"
> DO. The rotary converter has only to be sized big enough for the MAX. load
> you will ever apply to it, all-three machines ON at the same time. A
> proper
> rotary c. will give you "true" 3-phase lektricity. Best yet: Talk the
> local
> electrical utility into stringing you 3-phase to the garage, like I did!
> (Oh, I had to PAY 'em to add the "high leg" transformer, but it was worth
> it,
> as I now have "100% real, all the time, 200-amp/leg 3-phase" for less than
> a
> good rotary would have cost for 20 amps! (Were I facile with graft, I
> mighta
> got it for free!).
>
> Lotsa luck! Jan Rowland, Troll
>
>
> [Non-text portions of this message have been removed]
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
> discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
>

Scott:

OOPS!!! I just noticed when reading this post that you indicated multiple
motors. Don't even try using a static converter in that situation. Jan is
correct regarding the static converters and multiple motors. Only a rotary
will give you the true 3 phase you will need for that application. Also, one
more little piece of advice, always start your largest motor FIRST then the
smaller ones.

Regards,

Randy Abernathy
Woodworking Machine Specialist
4626 Old Stilesboro Road NW
Acworth, GA 30101-4066
Phone/Fax: 770-974-5295
E-mail: cnc002@...


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