Siemens SINAMICS G110M - 8.21 Overcurrent protection

Function description
The DC link voltage increases as soon as the motor supplies regenerative power to the converter
when braking. The regenerative power means that the DC link voltage in the converter
increases. Depending on the DC link voltage, the converter outputs the regenerative power to
the braking resistor through the braking chopper. The braking resistor converts the regenerative
power into heat, therefore preventing DC link voltages > Vdc_max.
%UDNLQJUHVLVWRUEUDNLQJSRZHU
%UDNLQJUHVLVWRU
/RDGDFFHOHUDWLQJ0RWRUL]HGRSHUDWLRQ
/RDGEUDNLQJ*HQHUDWLQJRSHUDWLRQ
6SHHG
'&OLQNYROWDJHU
0D[LPXP'&OLQNYROWDJHU
$FWLYDWLRQWKUHVKROGIRUWKHEUDNLQJ
PRGXOH
U
W
W
W
Figure 8-69 Simpli󹪝ed representation of dynamic braking with respect to time
Using p0219, you de󹪝ne the maximum braking power that the braking resistor must absorb.
Braking resistor braking power
For p0219 > 0, the converter deactivates the VDC_max controller.
For vector control, p0219 de󹪝nes the regenerative power limit p1531.
3
PD[
3
W
S
The converter extends the ramp-down time of the motor when the braking power is too low.
The SIZER PC tool supports you when calculating the braking power.
Con󹪝guring support (Page 416)
Advanced commissioning
8.20 Electrically braking the motor
Distributed converter for SIMOGEAR geared motors
Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL 317