A0912 alarm in siemens micromaster 430 or MM430 drive
How can resolve problem A0912 alarm in siemens micromaster 430 or MM430 drive ?
Cause : Vdc-min controller active. Vdc min controller will be activated if DC-link voltage (r0026) falls below minimum level (P2172). 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.