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How do I fix an F71 System Fault code for a DG1 drive?

The system fault is due to an issue in the parameters signals in the digital signal processing chip that was received from the main processor board. For example this could be the basic motor parameters if they would come back as 0 or any other data would be seen as in adequate the fault would occur. When this fault occurs go in and verify parameter settings in the basic settings group if things look okay, perform a factory reset and reprogram the drive. If fault continues to return replace control board.