Siemens SINAMICS G120C Operating Instructions Manual page 335
Low voltage converters
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Also See for SINAMICS G120C:
- Operating instructions manual (470 pages) ,
- Compact operating instructions (92 pages) ,
- Getting started (68 pages)
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Function description
Figure 8-66
The motor supplies regenerative power to the converter when braking. The regenerative
power means that the DC-link voltage in the converter increases. Above the activation
threshold for the braking module, the converter forwards the regenerative power to the
braking resistor. The braking resistor converts the regenerative power into heat, thereby
preventing converter faults due to excessive DC-link voltage.
Factory setting for the activation threshold for the braking module: 760 V
NOTICE
Overload of motor insulation during braking
When the motor brakes, the DC-link voltage, and thus also the voltage load of the motor,
increases. Under unfavorable circumstances, the converter can overload the motor insulation
and damage the motor.
• Reduce the activation threshold for the braking module
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
Flow direction of power
Simplified representation of dynamic braking with respect to time
Advanced commissioning
8.21 Electrically braking the motor
333
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