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Sam Goldwasser Sam Goldwasser is offline
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Default 120VAC 15A motor won't spin up to speed

"Michael Kennedy" writes:

How do you determine what value cap you need by checking the windings with a
meter?

Upon closer inspection there is one 330mfd and one rusty cap that I can't
read.


Remove all load from the motor shaft.

Disconnect everything but the run winding. Spin the rotor by hand and
power up the motor. It should come up to speed instantly and run cool.

If this works, the rotor and windings are probably OK.

If it cannot be spun up, buzzes, still catches fire , one of the windings
may be shorted. Another alternative is that the bearings are so shot
that it's binding on the stator.

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