What can cause a CRF2 (Thyr. Soft charge) fault on the ATV61 or ATV71 drive?

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Issue:
CRF2 fault on an ATV61 or ATV71 drive.

Product Line:
Altivar ATV61 and ATV71

Environment:
All

Cause:
Thyristor is not ramping DC bus voltage up, Main control board or soft charge board.

Resolution:
Run the thyristor test in menu 1.10 under (Test Procedures).
Replace the Thyristors and/or soft charge board (based on frame sizes).
Replace the power board.
Replace the main control board.