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CRF2 fault on an ATV61 or ATV71 drive.
Altivar ATV61 and ATV71
Thyristor is not ramping DC bus voltage up, Main control board or soft charge board.
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.