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A912 alarm in siemens V20 Drive

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Cause : Vdc_min controller active comes when the Vdc_min controller will be activated if the DC-link voltage (r0026) falls below the level specified in r1246.

  • The kinetic energy of the motor is used to buffer the DC-link voltage, thus causing deceleration of the inverter! So short mains failures do not necessarily lead to an undervoltage trip.
  • Note that this warning may also occur on fast ramp-ups.

 

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