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What can cause an InF3 or internal error 3 on the ATV630 and ATV930 Process drives?

Issue:
InF3 error on the ATV630 and ATV930 Process drives?

Product Line:
ATV630, ATV930, ATV660, ATV960 etc

Environment:
All 

Cause:
 ISL communication time out error between Application and power board

Resolution:
• Check the internal connections (44 pin ribbon cable between control block and power board).
• Replace the control block
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