Re: PFCs

Thanks to all who replied to my PFC question, so now I know two things:
That motor start caps and run caps are very different things, and, more
importantly, that the caps I have ARE motor RUN caps, not start caps. ;)

Might MW oven caps also work? I've heard that they have an  internal
resistor, so would this have a negative effect?

Grayson Dietrich

On Fri, 22 Oct 1999 16:31:53 -0600 Tesla List <tesla-at-pupman-dot-com> writes:
> Original Poster: "Lau, Gary" <Gary.Lau-at-compaq-dot-com> 
> For kicks, I once tried using motor starting caps for PFC's.  The 
> case
> became quite warm within less than a minute of run time.  Useless.
> Start caps are only designed for brief, intermittent operation, when 
> a motor
> is just spinning up.  Motor Run caps are designed for continuous 
> operation.
> You want to use motor RUN caps for PFC's, not motor START caps.  Too 
> bad,
> the START caps are so much cheaper!
> Regards, Gary Lau
> Waltham, MA USA
> >Original Poster: Grayson B Dietrich <electrofire-at-juno-dot-com> 
> >
> >Hello All,
> >
> >I was wondering,
> >
> >Would a bank of paralleled motor-start caps be suitable as a power 
> factor
> >correction cap? I I calculated, if memory serves, something like 
> 80uF or
> >90uF for my 12kV 60mA NST. When powering my TC, it blows a 10 amp 
> fuse no
> >problem...   ...and I really wish it wouldn't. Since then I could 
> safely
> >fuse my variac with the fuse holder built into it.

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