Siemens A912 fault code meaning
Siemens / A912
Series: V20
Vdc_min controller active
converter
Meaning: If the DC bus voltage (r0026) falls below the threshold defined in r1246, the Vdc_min controller is activated. The motor's kinetic energy is then used to support the DC bus voltage, causing the converter to decelerate. A short circuit fault therefore does not necessarily cause an undervoltage trip.
Possible causes
Source: SINAMICS V20 Converter P420