Siemens Micromaster 420 or MM420 Drive
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Jun 09, 2022 5:23 am
F0450 fault in siemens micromaster 420 or MM420 drive - comes when self-test routine unsuccessful or failure of the internal RAM at the switch-on test.
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Jun 09, 2022 5:24 am
Cause : Failure BIST tests.
Self-test routine unsuccessful (refer to fault value r0949):
- r0949 = 1: Self-test routine for power module components unsuccessful
- r0949 = 2: Self-test routine for closed-loop control module components unsuccessful
- r0949 = 4: Several function tests were unsuccessful
- r0949 = 8: Several tests carried-out at the I/O module were unsuccessful (only MICROMASTER 420)
- r0949 = 16: Failure of the internal RAM at the switch-on test
Diagnosis & Remedy
- the drive is functional, but several functions are not correctly executed.
- replace the drive
