Dynamic Braking - Siemens SINAMICS G120 Operating Instructions Manual

Setting functions
8.7 Application-specific functions
8.7.3.4

Dynamic braking

Typical applications for dynamic braking include:
● Horizontal conveyors
● Vertical and inclined conveyors
● Hoisting gear
For these applications, dynamic motor behavior with different speeds or continuous change
of direction is required.
Principle of operation
Burns when touching a hot braking resistor
A braking resistor reaches high temperatures during operation. Touching the braking
resistor may result in burns.
• Do not touch a braking resistor during 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
prevents the DC-link voltage from increasing above the limit value U
Figure 8-24
274
CAUTION
Simplified representation of dynamic braking with respect to time
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
.
DC link, max