What is ISL( E34) fault on Altivar AFE (Active Front End).

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Communication fault on the internal serial link.
Cause: A failure of the internal electronics occurred, e.g. based on external interferences.
Remedy: Shut down mains supply, wait for complete discharge of DC link (LED 1) and switch on again.
Check whether there is a source of interferences nearby.
If the fault is still present, the control block has to be exchanged.