That sounds like the centrifugal start switch is not staying open and it is
connecting start cap(s) back into the start configuration. First look at
the start push button and make sure it is not trying to restart. Then open
the motor and take a close look at the centrifugal switch. Either switch
may be involved.

Bob Swinney
"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?