Siemens SINAMICS G120C Operating Instructions Manual page 353

Function description
When the line supply dips or is interrupted, the DC-link voltage in the converter decreases. The
kinetic buffering (V
the load to go into slightly regenerative operation. As a consequence, the converter covers its
power loss and the losses in the motor with the kinetic energy of the load. The load speed
decreases, but the DC-link voltage remains constant during the kinetic buffering. After the line
supply returns, the converter immediately resumes normal operation.
Figure 8-74
Parameter
Parameter
r0056[0...15]
p0210
p1240[D]
p1245[D]
r1246
p1247[D]
p1255[D]
p1257[D]
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
control) intervenes at an adjustable threshold. The V
DC min
Principle mode of operation of kinetic buffering
Description
CO/BO: Status word, closed-loop control
Device supply voltage
Vdc controller configuration (vector control)
Vdc_min controller switch-in level (kinetic buffering)
Vdc_min controller switch-in level (kinetic buffering)
Vdc_min controller dynamic factor (kinetic buffering)
Vdc_min controller, time threshold
Vdc_min controller, speed threshold
Advanced commissioning
8.30 Kinetic buffering (Vdc min control)
DC min
Factory setting
-
400 V
1
73% ... 76%
- V
300%
0 s
50 rpm
control forces
351