Motor start capacitor

Motor start capacitor

This topic has 6 replies, 5 voices, and was last updated 1 September 2024 at 08:27 by john halfpenny.

Viewing 7 posts - 1 through 7 (of 7 total)

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31 August 2024 at 17:32 #750404
john halfpenny
Participant
@johnhalfpenny52803
I have to change a 9.5 microfarad cap, but can only find 9 or 10 readily available. Which is preferable?
Advert

31 August 2024 at 17:38 #750405
not done it yet
Participant
@notdoneityet
Check the tolerance of those capacitors. They likely overlap.
31 August 2024 at 19:32 #750421
SillyOldDuffer
Moderator
@sillyoldduffer
either will do. That size are often ±20%, and motors ain’t that fussy, The important thing is that the replacement is a motor start capacitor.

Dave
31 August 2024 at 19:39 #750422
john halfpenny
Participant
@johnhalfpenny52803
Thanks. I had checked tolerance (5%), but that doesn’t help me resolve whether to go high or low; it seems not too critical as a temporary fix of a 6 has the motor working again.
31 August 2024 at 22:04 #750449
noel shelley
Participant
@noelshelley55608
Go High but more important is the Voltage look for 400+ and 500V is good. Good luck . Noel
1 September 2024 at 07:07 #750473
John Haine
Participant
@johnhaine32865
+/- 5% will make sod all difference to the phase or magnitude of the winding current, use either. Or stick with 6! Is this a cap start and run or just start, with a centrifugal switch? If so and 6 works then stick with it.
1 September 2024 at 08:27 #750483
john halfpenny
Participant
@johnhalfpenny52803
It’s a pipe motor for a roller garage door. Very instructive to dismantle, but I can do it very quickly now. I’ll get a 10 as back up. Thank you all.
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