OH4
Motor Overheat Fault (Level 4)
Yaskawa · F7 Drive Programming
What does OH4 mean?
The OH4 fault indicates a critical over-temperature condition in the motor, detected when the motor temperature analog input (H3-09=E) surpasses the 2.34V fault level. Upon activation, the drive will immediately stop the motor using a configured method to prevent damage. Operating a motor under this severe overheat condition risks immediate insulation breakdown, permanent motor failure, and safety issues.