Good day everyone,
Single phase motor,3/4 Hp, capacitor start, dual voltage wired for 115VAC with Allen Bradley reversing contactors and 10 amp circuit breaker. It runs a machine via V-belt and very simple mechanics.
It intermittently(could be weeks) trips the breaker and after resetting the breaker everything works fine for days and often weeks.
I have two such cases on two different sites and one customer provided specific information regarding their motor (the machine is two months old/new) that it tripped after having moved for a 7-8 seconds. Not on start-up. And I can eliminated the possibility of mechanical cause.
I've had similar problems over the years and always were resolved after a few trips by replacing the motors but would love a more knowledgeable approach to troubleshooting.
Single phase motor,3/4 Hp, capacitor start, dual voltage wired for 115VAC with Allen Bradley reversing contactors and 10 amp circuit breaker. It runs a machine via V-belt and very simple mechanics.
It intermittently(could be weeks) trips the breaker and after resetting the breaker everything works fine for days and often weeks.
I have two such cases on two different sites and one customer provided specific information regarding their motor (the machine is two months old/new) that it tripped after having moved for a 7-8 seconds. Not on start-up. And I can eliminated the possibility of mechanical cause.
I've had similar problems over the years and always were resolved after a few trips by replacing the motors but would love a more knowledgeable approach to troubleshooting.
- What tests can I perform on the motor?
- If the centrifugal switch does not open after the motor reaches the required speed what happens, how is the motor, capacitor, winding etc. affected?
- I removed the capacitor cover and the capacitor looked quite good but there was a very thin layer of red dust sort of like rust that was inside the cover and also on the part of the motor that was covered by the capacitor cover. Could this have come from inside the motor though the 1/2" hole the capacitor wire go through? If yes what would it be?