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What can cause an OLF1 fault on the Altiivar 12 drive?

Issue: 
What can cause an OLF1  fault on the Altiivar 12 drive?  

Product Line:
ATV12

Environment:
All serial numbers 

Cause:
Drive shuts down

Resolution:
• Check the drive settings. (nCr, ITh, CLI)
OPF1 1 output phase loss
• Loss of one phase at drive output
• Check the connections from the drive to the motor
• In case of using downstream contactor, check the connections, cable and contactor, continuity on the contactor
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