Vdc Control - Siemens SINAMICS G150 Operating Instructions Manual

Functions, Monitoring, and Protective Functions
9.2 Drive Functions
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
● Undervoltage in the DC link
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– Typical cause:
The drive is operating in regenerative mode and is supplying too much energy to the
DC link.
– Remedy:
Reduce the regenerative torque to maintain the DC link voltage within permissible
limits.
Note
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".
– 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 This process is known as kinetic
buffering.
Kinetic buffering is only possible as long as energy is generated by the movement of
the drive.
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A