Issue:
OL1 fault on ATV21/ATV212 drives.

Product line:
Altivar ATV212, ATV21

Resolution:

OL1 is an overload fault.
tHr parameter under main menu AUF is what determines the overload settings for a motor.  It is normally programmed to match motor FLA.
Confirm that the motor settings including uL, F415 and F417 match your motor name plate.
Check ACC time and make sure it is not too short a ramp up time.
Set AU1 to 0.
Measure current draw by motor, if possible, at the output to the motor.  If the current draw surpasses tHr value, then it will eventually fault out on OL1, given enough time has passed.
Check for power drop in the line side of the drive.
Can also try setting PT to 0.

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