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    What is OHF in the ATV18?

    What is OHF in the ATV18?

    Applies to ATV18

    Product Line:
    Variable frequency drive

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

    OHF is speed controller overload or a Drive Overtemperature Fault.

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

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