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Posted by bud-- on September 18, 2007, 12:10 pm
oldman960@hotmail.com wrote:
> I was reading an old thread in which the op posted some voltage
> reading. With the pump running, he had b-y 220v, r-y 220v, b-r 330v.
> This was 230v system with motor control.
>
> b-y is the run circut and r-y is the start circut. I know that the
> 220v will stay on the start circut to manitain the coil and keep the
> start capacitor out of the circut. What I was wondering about is the
> 330v on the b-r. Can anyone please explain this? I've asked around and
> no one seems to know. Most said they've never checked this combination
> when testing a pump, just the run circut.
>
> tia
>
The start winding is not in phase with the run winding so there is a
voltage between them. (Same idea as 3 phase power.)
--
bud--
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