Common Fault Diagnosis and Solutions for Heat Dissipation

Code No.:  E120

Overheating Error
- Check the internal and external temperature.
- Verify the condition of the VFD's cooling fan.
- Confirm the load current, assess whether the over-temperature setting values are reasonable.
- Improve the air circulation inside the control cabinet, and check that the cabinet's heat dissipation is functioning properly. If there are any heat-emitting objects nearby, remove them.  Check that the ambient temperature is not too high and that the air conditioner is working correctly.
- For those with a fan power board, check that the board is not damaged. 
- Determine whether excessive heat generation is due to a heavy load, and check that the output current is normal.
- Check that the fan has not reached the end of its service life or is not malfunctioning, and replace the fan if necessary.

Code No.:  E137

Fan Stalling Error
- Confirm whether the auxiliary channel fan on top of the VFD is functioning properly. If the fan can rotate normally but occasionally experiences stuttering, enter the second-level permission by following the steps: operation panel menu - security settings - change the password from 111 to 000 and press ENTER, and then modify parameter P1.19 in the P1 parameter group to 0 (to disable it).
- If the fan does not work or frequently gets stuck, the fan needs to be replaced.

Code No.:  E138

Temperature Sample Error
- Verify whether the temperature sampling connection cables and related components are functioning properly. If the mainboard has been replaced, confirm whether the initialized power of the mainboard is correct.

Code No.:  E121

Overheating Error
- The fan will operate when the VFD is running. Check whether the fan is functioning well, and if it is, inspect whether the temperature is within the normal range.