DrWhoF
Advanced Member level 1
We have a lathe with a 3-phase motor.
There are two big contactors to turn the lathe on and off and to change direction.
Also, there are another two big contactors to start the motor in the following sequence: star-to-delta.
When the mpotor is turned on the star contactor comes on and after a while the delta contactor is activated but at that moment from time to time the main circuit breaker trips.
I have no idea why, do you have any clues?
There are two big contactors to turn the lathe on and off and to change direction.
Also, there are another two big contactors to start the motor in the following sequence: star-to-delta.
When the mpotor is turned on the star contactor comes on and after a while the delta contactor is activated but at that moment from time to time the main circuit breaker trips.
I have no idea why, do you have any clues?