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Tool Talk Discussion Board

Re: Baldor Capacitor size

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Posted by missouri massey man on February 13, 2013 at 07:36:31 from (

In Reply to: Re: Baldor Capacitor size posted by GUIDO on February 05, 2013 at 15:48:20:

I thought start capacitors could be varied by ten percent and only run capacitors could be varied by twenty percent. Start caps typically being high in mfd whereas run capacitors are typically low in mfd. Memory may be a bit fuzzy though. I was thinking this motor is a motor with dual start capacitors, and capacitance being additive in parallel the total capacitance can be varied by ten percent. Let me know if I'm wrong, I don't want to be spreading incorrect info. The voltage induced in the start windings is typically much higher than the applied voltage, which is why you need 370v rating on a 240v motor. Too high on the start winding capacitance will eventually damage the start winding is what I was taught back in the day.

Are the capacitors bad, or do they just look bad. Many digital volt ohmeters have a capacitance scale that can be used to read the mfd ratings on a good capacitor. If one is good and you have the meter to read it, both will be the same size on a dual capacitor start motor.

Hope this helps you and want to be corrected if my memory is wrong.


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