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What can cause an InF0 or internal error 0 fault on the ATV630 and ATV930 Process drives?

Issue:
InF0 or internal error 0 fault on the ATV630 and ATV930 Process drives.

Product Line:
ATV630 and ATV930 Process drives

Environment:
All

Cause:
Internal control block CPU error.

Resolution:
Internal CPU error
Principle:
Internal control block CPU error.
Remedies:
- restart the drive (switch the drive OFF / ON)
- change the control block.