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What can cause an SLF fault on the ATV312 drive?
Altivar ATV31 and ATV312
Serial link fault or missing HMI with drive programmed for HMI or LCC control set to yes.
Make sure parameter LCC in the CTL menu is set to no if you are not using a remote HMI.
Make sure you don't have a interruption on your modbus connection.
Review this process in the provided video below: