Siemens Micromaster 420 or MM420 Drive
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Jul 01, 2024 6:55 am
Cause : BIST Tests Failure comes when an internal issue with the drive's hardware or software during its power-on self-checking routine.
The fault code F0450 on a Siemens Micromaster 420 (MM420) indicates a Built-In Self-Test (BIST) failure. This fault occurs when the drive's internal self-diagnostic tests detect an issue during startup or operation.
- Inverter may run but certain actions will not function correctly.
- Replace inverter.
