Dynamic Braking - Siemens SINAMICS G120 Operating Instructions Manual

Low voltage inverters built-in units with cu250s-2 control units and encoder evaluation

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Table of Contents

Dynamic braking

Typical applications for dynamic braking require continuous braking and acceleration

operations or frequent changes of the motor direction of rotation:

● Horizontal conveyors

● Vertical and inclined conveyors

● Hoisting gear

Principle of operation

The DC link voltage increases as soon as the motor supplies regenerative power to the inverter

when braking. The regenerative power means that the DC link voltage in the inverter increases.

Depending on the DC link voltage, the inverter 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.

Converter with the CU250S-2 Control Units

Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG

Simplified representation of dynamic braking with respect to time

Advanced commissioning

6.22 Electrically braking the motor