Siemens SINAMICS G130 - Page 388

Functions, monitoring, and protective functions
9.2 Drive functions
Inverter chassis units
388 Operating Instructions, 07/2016, A5E00331449A
Properties
● Vdc control
– Comprises Vdc_max control and Vdc_min control (kinetic buffering), which are
independent of each other.
– Contains a joint PI controller. The dynamic factor is used to set Vdc_min and Vdc_max
control independently of each other.
● Vdc_min control (kinetic buffering)
– The kinetic energy of the motor is used for buffering the DC-link voltage in the event of
a momentary power failure, thereby delaying the drive.
● Vdc_max control
– Control momentary regenerative load without shutdown using "overvoltage in the DC
link".
– Vdc_max control is only recommended for a supply without active closed-loop control
for the DC link and without feedback.
Description of Vdc_min control (kinetic buffering)
Figure 9-4 Switching Vdc_min control on/off (kinetic buffering)