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From: Alan Douglas on 10 Aug 2010 12:35
>> Hi all I have a pump with a 2HP 125 V AC motor. All of a sudden the
>> motor wont start anymore. If I switch it on it just does a humming sound
>> and then thermal protection kicks in.

The motor probably has a starting winding, capacitor, and centrifugal
switch in series across the AC line. As noted, the most likely
problem is the capacitor, but the switch could also be open, possibly
by a bit of dirt between the contacts.

Without the starting winding, yes, the motor will run equally well in
either direction.
From: Paul Hovnanian P.E. on 13 Aug 2010 14:07
a453 wrote:

> a453 wrote:
>
>
> Hi thanks to you all for the replies.
>
> I opened the motor.... there is a very rusty capacitor inside it.... the
> markings are unreadable.
>
> I disconnected the capacitor and tried to test if the capacitor still
> works by using a tester with different ohm settings... I always got no
> readings.... I guest that means that the capacitor is broken?

It may be, given your symptoms. But a DC continuity check isn't a good
indication of whether a cap is good or not.

> If so, now the problem i getting a new capacitor with the right size...
>
> The motor data is:
>
> dual voltage 125/250 V
>
> Amps 21.0/10.5
>
> 2.0 HP (SF 1.10 SF)
>
> This is a single phase Magnetek Centurion SE motor powered at normal 125
> Volt housedold power.
>
> My understandi is that i should look for an unpolarized motor star
> capacitor rated at 270-324 microFarad at 250 Volt
>
> Is this correct? Thanks so much for your help!!

Contact the manufacturer of the appliance that contains the motor. They
should know what size you'll need.

--
Paul Hovnanian paul(a)hovnanian.com
----------------------------------------------------------------------
Have gnu, will travel.
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