Siemens SINAMICS G150 Operating Instructions Manual page 433

Characteristics
● Vdc control
● Vdc_min control (kinetic buffering)
● Vdc_max control
Description of Vdc_min control (kinetic buffering)
Figure 9-4 Switching Vdc_min control on/off (kinetic buffering)
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A
– This comprises Vdc_max control and Vdc_min control (kinetic buffering), which are
independent of each other.
– It contains a joint PI controller. The dynamic factor is used to set Vdc_min and
Vdc_max control independently of each other.
– With this function, 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.
– This function can be used to 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.
Functions, Monitoring, and Protective Functions
9.2 Drive Functions
431