Protecting the motor and converter against overvoltage
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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.
Electrically braking the motor (Page309)
Parameters for Vdc_max control
The parameters dier depending on the motor control mode.
Parameter for
U/f control
Parameter for
vector control
Description Setting
p1280 = 1 p1240 = 1 VDC controller congu‐
ration
0: VDC controller is disabled (factory set‐
ting)
1: VDC controller is enabled
r1282 r1242 Vdc_max control switch-
on level [V]
DC-link voltage value above which the
Vdc_max control is activated.
p1283 p1243 Vdc_max control dy‐
namic factor [%]
Scaling closed-loop control parameters
p1290, p1291 and p1292.
Factory setting: 100
Advanced commissioning
7.26Motor and converter protection by limiting the voltage
SINAMICS G115D Wall Mounted distributed drive
326 Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA
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