Applicable Systems
Modicon M221
Modicon M241
Modicon M251
Modicon M340
Modicon M580
Altivar
Symptoms
Internal CPU fault detected.
Possible Causes
CPU watchdog timeout or processing fault.
Troubleshooting Steps
Power cycle. If persists, replace control board.
How to Reset
Power cycle or replace control board
Common Replacement Parts
- Control board
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Source: Schneider ATV630 fault manual
Category: Electrical
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