"JimInsolo" wrote in message
link.net...
I have a 1 HP induction motor with capacitor start and capacitor run. As
I
understand the function, the start capacitor circuit is engaged at start
up
and then dis-engages when the motor reaches full speed. The motor works
fine most of the time, but every so often it will make a terrible sort of
vibrating racket and blow the breaker. Sometimes if I just wait a minute
or
so it will start and run fine again. Any ideas on what could cause this?



I have only had this problem with import electric motors that are new and
only when the room temperature was near freezing. I get the impression that
the starter circuit is not disengaging because it got stuck because of low
temperatures. If I tried to start the motor and it acted up, then I would
turn it off and try it again after a few moments. I had to do this several
times until the internal heat of the motor warmed up the starting circuit.
Once it got warmed up it would work fine. When I heated the shop I never had
the problem again.