Compound Braking - Siemens sinamics G120 Operating Instructions Manual
Low voltage inverters chassis devices 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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Advanced commissioning
6.7 Application-specific functions
6.7.3.2
Compound braking
Typical applications for compound braking include:
● Centrifuges
● Saws
● Grinding machines
● Horizontal conveyors
For these applications, the motor is normally operated with a constant speed, and is only
braked down to standstill after longer periods of time.
Principle of operation
Image 6-49
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
276
Motor brakes with and without active compound braking
Operating Instructions, 01/2016, FW V4.7 SP6, A5E31759476B AE
Converter with CU250S-2 Control Unit
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