Electrical Motor Controls For Integrated Systems 5th Edition Fix Portable -

When a VFD reduces motor speed too quickly, the motor acts as a generator. It pushes energy back into the drive, causing a DC bus overvoltage fault (often displayed as OV or F005 ).

Check 24VDC/120VAC power supply, clean contactor pole faces, or replace the coil. When a VFD reduces motor speed too quickly,