Dynamic Braking - Siemens SINAMICS G120 Operating Instructions Manual

Functions
8.9 Application-specific functions
8.9.2.4

Dynamic braking

Dynamic braking is typically used in applications in which dynamic motor behavior is
required at different speeds or continuous direction changes, e.g.:
● Horizontal conveyors
● Vertical and inclined conveyors
● Hoisting gear
Principle of operation
The inverter controls the braking chopper depending on its DC link voltage. The DC link
voltage increases as soon as the inverter absorbs the regenerative power when braking the
motor. The braking chopper converts this power into heat in the braking resistor. This
therefore prevents the DC link voltage increasing above the limit value V
Figure 8-13
Mounting the braking resistor
Figure 8-14
210
DC
DC, max
Simplified representation of dynamic braking with respect to time
Permissible mounting orientation of the braking resistor
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
.
DC link, max
SINAMICS G120C Inverter