100MFD 55V

From: vrs <vrs_at_msn.com>
Date: Thu Dec 4 06:59:42 2003

> These are oilfilled AC capacitors. Not an electrolytic capacitor. They are
> usually used together with the motor. Phase-shift capacitor for example to
> generate a second phase on a single phase system.
>
> Do no replace with an electrolytic capacitor. Electrolytic capacitors are
DC
> only.
>
> Old DEC equipment contain a lot of them. It is not uncommon to find such
> capacitors with PCB (Polyclorinathed Bifenyles, if my speeling is correct)
> in them. Take care if one of these goes into smoke. Burnt PCB produces
> really lethal dioxines.

Hmm...Doesn't look oil-filled to me; more like a cream-colored paste. Looks
just like an electrolytic which has blown crud out through the safety vent,
which has then hardened over the years into a crust. Under the crust is a
cream-colored substance with a texture like hardened toothpaste.

I do know that motor start and motor run are different and incompatible.

This one is connected to the coils driven by a G848, if I understand the
TU56 drawings correctly. The G848 drawing shows it being driven
bi-directionally to "motor supply", so you could be right about it not being
polarized, though I also thought I read a faint "-" next to one of the
solder tabs.

How would I tell the difference between a motor-run and a motor-start cap by
looking?

Thanks!

    Vince
Received on Thu Dec 04 2003 - 06:59:42 GMT

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