Compound 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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Also See for SINAMICS G120:
- List manual (1256 pages) ,
- Manual (732 pages) ,
- Operating instructions manual (550 pages)
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6.22.2
Compound braking
Compound braking is suitable for applications in which the motor is normally operated at a
constant speed and is only braked down to standstill in longer time intervals.
Typically, the following applications are suitable for compound braking:
● Centrifuges
● Saws
● Grinding machines
● Horizontal conveyors
Compound braking is not permissible for applications with suspended loads, e.g. lifting
equipment/cranes all vertical conveyors.
Principle of operation
Figure 6-63
Compound braking prevents the DC-link voltage increasing above a critical value. The inverter
activates compound braking depending on the DC-link voltage. Above a DC-link voltage
threshold (r1282), the inverter adds a DC current to the motor current. The DC current brakes
the motor and prevents an excessive increase in the DC-link voltage.
Note
Compound braking is possible only with the U/f control.
Compound braking does not operate in the following cases:
● The "flying restart" function is active
● DC braking is active
● Vector control is selected
Converter with the CU250S-2 Control Units
Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG
Motor brakes with and without active compound braking
Advanced commissioning
6.22 Electrically braking the motor
321
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