Siemens Micromaster 440 or MM440 Drive
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Jun 12, 2022 10:25 am
How can resolve problem A0912 alarm in siemens micromaster 440 or MM440 drive ?
1 Reply
Jun 12, 2022 10:26 am
Cause : Vdc-min controller active
- Vdc min controller will be activated if DC-link voltage (r0026) falls below minimum level (refer to r0026
and P1240).
- The kinetic energy of the motor is used to buffer the DC-link voltage, thus causing deceleration of the
drive!
- So short mains failures do not necessarily lead to an undervoltage trip.
