Vdc Control - Siemens SINAMICS S120 Function Manual

U/f control (vector control)

7.5 Vdc control

7.5 Vdc control
Function description
The "Vdc control" function can be activated using the appropriate measures if an overvoltage
or undervoltage is present in the DC link.
Figure 7-3 V U/f
dc control
Undervoltage in the DC link
● Typical cause:
Failure of the supply voltage or supply for the DC link.
● Remedy:
Specify a regenerative torque for the rotating drive to compensate the existing losses,
thereby stabilizing the voltage in the DC link (kinetic buffering).
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Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive functions