Vdc Control - Siemens SINAMICS G150 Operating Instructions Manual

9.2.4

Vdc control

Description
The "Vdc control" function can be activated using the appropriate measures if an overvoltage
or undervoltage is present in the DC link.
● Overvoltage in the DC link
– Typical cause:
– Remedy:
● Undervoltage in the DC link
– Typical cause:
– Remedy:
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
The drive operates in regenerative mode and is supplying too much energy to the DC
link.
By reducing the regenerative torque, the DC-link voltage is maintained within
permissible limits.
Note
Fault F30002 "DC-link overvoltage"
When switching off or during rapid load changes, if failure often arises and fault
F30002 "DC-link overvoltage" is reported, you may be able to improve the situation by
increasing the gain factor for the Vdc controller p1250 (p1290), e.g. from "1.00" to
"2.00".
Failure of the supply voltage or infeed for the DC link.
Specify a regenerative torque for the rotating drive to compensate the existing losses,
thereby stabilizing the voltage in the DC link. This process is known as kinetic
buffering.
Kinetic buffering is only possible as long as energy is generated by the movement of
the drive.
Functions, monitoring, and protective functions
9.2 Drive functions
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