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oH4 fault code in yaskawa GA500 drive

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Cause : Motor Overheat Fault (PTC Input) comes when the motor has overheated or the temperature of the motor has exceeded the safe operating limit.

  1. Check the load level, acceleration/deceleration time, and motor start/stop frequency (cycle time). 
  2. Decrease the load.
  3. Increase the values set in C1-01 to C1-08 [Acceleration/ Deceleration Times].
  4. Set E2-01 [Motor Rated Current (FLA)] correctly to the value specified by the motor nameplate. 
  5. Make sure that the motor cooling system is operating correctly, and repair or replace it if it is damaged. 
  6. Adjust E1-04 to E1-10 [V/f Pattern Parameter
  7. Adjust E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2, adjust E3-04 to E3-10.
  8. Decrease the values set in E1-08 [Mid Point A Voltage] and E1-10 [Minimum Output Voltage].
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