Siemens SINAMICS G115D Operating Instructions Manual page 328

Advanced commissioning
7.26 Motor and converter protection by limiting the voltage
Protecting the motor and converter against overvoltage
The Vdc_max control extends the motor ramp-down time when braking. The motor then only
feeds so much energy into the converter to cover the losses in the converter. The DC link
voltage remains in the permissible range.
The Vdc_max control is not suitable for applications where the motor is in continuous
regenerative operation, e.g. as is the case for cranes and centrifuges.
Parameters for Vdc_max control
The parameters differ depending on the motor control mode.
Parameter for
U/f control
p1280 = 1
r1282
p1283
326
Electrically braking the motor (Page 309)
Parameter for
vector control
p1240 = 1
r1242
p1243
Description
VDC controller configu‐
ration
Vdc_max control switch-
on level [V]
Vdc_max control dy‐
namic factor [%]
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA
Setting
0: VDC controller is disabled (factory set‐
ting)
1: VDC controller is enabled
DC-link voltage value above which the
Vdc_max control is activated.
Scaling closed-loop control parameters
p1290, p1291 and p1292.
Factory setting: 100