It's mainly a problem with the voltage regulator. The electromotive force of AC power supply is related to frequency, and the frequency is not normal, and the voltage can not be normal. It is recommended to adjust the voltage regulator when the speed is 1500RPM and no load. As for tripping, the circuit breaker Settings can be detected. The circuit breaker time is long or the number of breaks is too many, the contact may be oxidized, there may be a problem. But the trip is mainly the problem of the circuit breaker setting value. Unless the circuit breaker is controlled by the controller trip, such as high voltage protection trip, high and low frequency protection.