1. Check the power supply: first, make sure that the inverter has been connected to the correct power supply and that the voltage and current are within the specified range.
2. Check the circuit board: Check the inverter circuit board for moisture or other physical damage. If there is a problem, the circuit board needs to be replaced.
3. Check the motor: Check the motor for abnormal sounds or high temperature. If there is a problem, the motor needs to be replaced.
4. Check the sensors: Check the sensors for damage or incorrect settings. If there is a problem, the sensor needs to be replaced.
5. Check the controller: check whether the controller is faulty or the parameters are set incorrectly. If there is a problem, you need to replace the controller or reset the parameters.
6. Stop the machine for maintenance: if the above steps can not solve the problem, you need to stop the machine for maintenance. Before repair, you need to disconnect the inverter and motor connection, and ensure that the inverter completely stop running.