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How do I fix an F55 RTC Faultcode for a DG1 drive?

The RTC fault is the real time clock fault, this would occur if an error occurs in the real time clock chip or the time power was low going to the chip. This is a user settable fault, if the fault occurs verify the settings in the protection group of the fault action. If set to fault and setting it to no action it should allow for bypassing the fault. There could be a potential issue with the control board that holds the real time clock chip, replace the control board.