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Run Capacitor Value #69946
09/25/06 03:37 PM
09/25/06 03:37 PM
W
wendel  Offline OP
Member
Joined: Aug 2004
Posts: 55
I was servicing a generic pool pump motor. It's a Century Electric (Magnetek) 1 hp, 3450 rpm, 230/115 volt, 56J frame, part #B828.

I noticed the capacitor was badly rusting. I couldn't clearly read the capacitor's label. It appears to be 20 mfd but I need to verify that value. Possiby some of you have serviced pool motors. Does 20 mfd seem to be a reasonable value for the above described motor? I've tried to locate data on it but without success. Any help greatly appreciated... I may need a new capacitor soon.

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Re: Run Capacitor Value #69947
09/25/06 08:21 PM
09/25/06 08:21 PM
C
Crowbar  Offline
Member
Joined: Jan 2003
Posts: 33
Pittsburgh, PA,USA
Century has been bought out by A.O. Smith, 20 mfd sounds reasonable to me, here is link that may provide more information. http://www.aosmithmotors.com/concertox/script.exe/aosepc/crm/ddl/serviceShopLoc.html

Re: Run Capacitor Value #69948
09/26/06 03:53 AM
09/26/06 03:53 AM
R
RODALCO  Offline
Member
Joined: Dec 2005
Posts: 856
Titirangi, Akld, New Zealand
20 µF is a reasonable value for a 1 HP motor.
These pump motors start usually under lightly loaded conditions.

Normally 55 µF per kW for medium loaded motors I go by so the 20 µF should work fine.


The product of rotation, excitation and flux produces electricty.
Re: Run Capacitor Value #69949
09/27/06 04:02 AM
09/27/06 04:02 AM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
From Alan Belson:

Quote
I'd go for about 20uF per horsepower, if you can't read the OE label, but I'm told by my friendly Scot neighbor "dinna gae any higher".

And I second the comments about frequent starts - Pic, "balloon capacitor", is what happened when I pushed a 3hp motor too hard.
BTW the motor still just about started, [after a struggle], which reason led to the discovery of the problem.

Rod, 55uF per kW?


[Linked Image]



[This message has been edited by pauluk (edited 09-27-2006).]


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