Motor Start Problem - Electrical - Contractor Talk

Motor Start Problem

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Old 11-26-2018, 01:28 PM   #1
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Motor Start Problem

Motor is 1/2 HP, 120V.

There is a start capacitor, rated at 145-175 mF.

The capacitor failed, so I replaced it. Exact same specs. Now, the motor starts as it should, except, that if there is even the smallest amount of product is the machine, the motor won't start.

It used to start fine, no matter how much load was on it.

The manufacturer said that he has started putting a different motor into these machines, "due to problems with the motor".

Could this be a separate problem, or still a capacitor problem?
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Old 11-26-2018, 04:36 PM   #2
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Re: Motor Start Problem

Belt/chain too tight? Bad bearing on armature?

Bad centripetal?(closed at stop, opens @ % of top RPMs) starter switch bad? If its a little dirt/spider, a gentle tapping might fix it near the switch...

Usually the starter switch will make a very audible 'Click'.

remove capacitor from wiring, Ohm out the starter wire, unplugging the motor first of course. It is possible the starter winding has failed open....

Over greasing or water exposure ruins most Starter switches....

Have the "new" cap tested... Some come bad like light bulbs... Test the next one at the store....

More hours run on invertor power supplies = more likely to have winding shorted by dirty sine waves...


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Old 11-26-2018, 04:39 PM   #3
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Re: Motor Start Problem

Originally Posted by Fouthgeneration View Post
Have the "new" cap tested... Some come bad like light bulbs... Test the next one at the store....
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