(1) Check the fault phenomena and indications of the inverter, as well as the changes of the external environment when the fault occurs.

② Analyze the causes of failure.

(3) Open the equipment to check the damaged place and analyze the feasibility of maintenance and recovery.

④ Analyze the working principle of the circuit from the working position of the damaged device, and find out the cause of the device damage.

⑤ Find relevant equipment to replace.

⑥ Under the condition of eliminating all the causes and causes of faults, power on to carry out experiments. When doing this step, all external conditions are necessary, and the fault will not be amplified.

When VFD fails, it will face the pressure of restarting. Don't let this pressure delay your time to solve the problem. Instead, remember troubleshooting checkpoints: check the basics (controller display, connection and temperature), check the motor, check the inverter-and then check it carefully.

Check the controller display. Most controllers include an interface for setting the operation of the inverter and displaying its operation information after the inverter is operated. Although the information displayed is different, most controllers will tell you about heavy current (usually including blown fuse and overload trip), high and low voltage of input and output, high temperature, internal fault, and even provide advanced power supply diagnosis.