Maintainance- inverter E0 of cutter machine , how to solve ?

Inverter brand: Yatai

Press the red button to see if the frequency can be restored to normal, if the restoration of normal to the motor of the three lines removed, and then start to see if the situation will happen again, if not the motor is broken, if still have this error, means the inverter is broken

按红色键看变频能不能恢复正常，若恢复正常把电机的三根线拆掉，再启动看会不会再出现这种情况，若不出现就是电机坏了，还出现这种保护就是变频坏了