23 January 2021
Shunt trip breaker is tripping
ATS22 Soft Start
Motor Control Centers using an ATS22 Soft Start with a shunt trip breaker
Time delay relay is set to the wrong time.
Increase the time on the time delay relay. This relay is used to delay the energization of the shunt trip coil when the bucket is powered ON. The shunt trip coil must not be allowed to energize until the normally closed trip relay on the soft start has time to open. Also, if the ATS22 goes to a faulted state, the shunt trip will trip the breaker.