Re: Power Factor Capacitor -- Was -- RE: schematics...Adam Smith's

• To: tesla-at-pupman-dot-com
• Subject: Re: Power Factor Capacitor -- Was -- RE: schematics...Adam Smith's
• From: "Mark Broker" <broker-at-uwplatt.edu> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sat, 26 Feb 2000 01:20:45 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List wrote:

> Original Poster: "Bunnykiller" <bigfoo39-at-idt-dot-net>
>
> Tesla List wrote:
> >
> > Original Poster: "William Parn" <parn-at-fgm-dot-com>
> > >
> >
> > What is a power factor capacitor, and where does it go?
>
> Hi William..
>
> a PFC cap is a capacitor that is normally used before the load ( NST
> etc) it is wired in paralell with the 120V system  altho most PFC caps
> are of low values ( uF wise)  you end up having to parallel several
> together to get a hi enuf value to be effective
>
> if you are looking for PFC caps   be sure to look for "Motor Run"  caps
> ...  the "motor start" caps are cheaper for the amount of uF but...
> they dont hold up well in extended usage ( motor start caps are used for
> a brief moment when the motor starts, then they switch off)(( they just
> offer a surge to help out starting torque))
>
> most motor run caps are  oval shaped and about 2 times taller than they
> are wide  usually they are in a metal case too ...
>
> Scot D

Actually, I've been told that Aluminum Electrolytic will work for a 120VAC
PFC cap.  These are inexpensive and very common.  And to head off criticism
that Aluminum electrolytic caps shouldn't be used in an AC circuit, I was
told by an Electrical Engineer (Technician?) who runs all the electrical
labs here at school.  He said that electrolytics can take the AC, just not a
constant negative DC bias.

Mark

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