How can I troubleshoot an Altivar Machine Drive with an Output Phase Fault?

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Issue:
Troubleshooting an Altivar Machine Drive with an Output Phase Fault, OPF1 or OPF2.

Product Line:
Altivar Machine Drive ATV12, ATV320, ATV340

Environment:
All serial numbers for Altivar Machine Drive

Cause:
N/A

Resolution:
[Single Output Phase Loss] OPF1
Principle:

This fault appears when one motor phase is lost at the output of the inverter

Probable cause:

Loss of a phase at the output of the inverter
Current is too low while running. Especially when starting and stopping where the frequency is lower.

Remedies:

Check the connections between the inverter and the motor
Check output current for an imbalance in one phase

[Output Phase Loss] OPF2
Principle:

This fault appears when 3 motor phases are lost at the output of the inverter.

Probable cause:

Motor not connected or motor output power is too low.
Motor or drive output contactor is open.
Unstable motor currents.

Remedies:

Check the connections between the inverter and motor.
If using a motor contactor set parameter OPL (motor phase loss) to OAC or turn off OPL and use separate motor overloads
- To turn off OPL: [Complete settings] [Error/Warning handling] [OutPhase loss Assign]
Test drive with no motor. Turn off OPL and run drive open circuit and test voltage on output for balancing
Check motor parameters and try to apply autotuning if possible:
- Verify and optimize the following parameters: [IR compensation] UFr, [Nom Motor Voltage] UnS and [Rated mot. current] nCr and perform [Autotuning] tUn.
Check or extend Output Phase Loss Time Detect [OutPhaseLoss Delay] Odt
If intermittent or able to run at times without faulting then check motor currents.