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What is OHF in the ATV18?

Issue:
What is OHF in the ATV18?

Environment:
Applies to ATV18

Product Line:
Variable frequency drive

Cause:
Customer getting OHF fault on the ATV18 display, what is this fault saying and how to fix it?

Resolution:
OHF is speed controller overload or a Drive Overtemperature Fault.

Probable cause:
  • I2t too high
  • Speed controller temperature too hight
Remedies:
  • Check the motor load
  • Check the speed controller ventilation and the environment
  • Wait for it to cool before restarting



 
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