1. It is necessary to confirm that the inverter has been powered off and disconnected from the power supply. Ensure safe operation.

2. Find the screw on the inverter housing and loosen it with a suitable screwdriver.

3. There will be a cover plate on the shell of some inverters, and it is necessary to remove the cover plate to see the internal structure of the inverter.

4. Carefully pull the shell outward to avoid damaging internal circuits and components.

5. If you need to check or repair the frequency converter further, you can use multimeter and other testing tools for measurement and diagnosis.