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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:
Internal serial link fault.
Check the +24v dc on control terminal board
Check the environment (electromagnetic compatability).
Check the connections to make sure there is no shorts on terminal side.
Replace the installed option board.
Change the control terminal pod
Change the Main control board.
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