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What are the possible causes of INF 7 fault on Altivar 71 drive.

The INF7(Internal Hardware Initialisation) fault is a problem with the initialization of ASIC on the power board. The initialization is done by the micro-controller of motor control board. So, the problem can come from a bad connection of ribbon cable between power board and motor control board, or a problem with the ASIC of power board, or a problem with the motor control board. 
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