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What causes an ILF code on an ATV61 or ATV71?

Issue:
 Fault code ILF: Internal Link Fault

Product Line:
 Altivar 61/71

Environment:
 All models and serial numbers

Cause:
 This fault appears when the communication between the option board and drive is interrupted

Resolution:
 Check the +24v dc on control terminal board
 Check the environment (electromagnetic compatability).
 Check the connections.
 Replace the installed option board.
 Change the control terminal pod
 Change the Main control board.
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