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The ATV312 gives me the error " OLF " every time I try to run it.

This error is due to an overload on the motor. The motor is  using excessive current.
To solve this issue, please follow the following steps :

First : Make sure the load is suitable for the motor.
Second : Check the setting of the motor thermal current in the parameter " Ith " in the settings ( Set- ) menu. This has a factory setting equal to the drive nominal rated current. It should be adjusted to the current rating on the motor nameplate.
Third: Re-measure the cold stator resistor value ( rSC ) in the ( dRC- ) menu.
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