Compound Braking - Siemens SINAMICS G120C Operating Instructions Manual
Low voltage inverter
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Also See for SINAMICS G120C:
- Operating instructions manual (478 pages) ,
- Compact operating instructions (92 pages) ,
- Getting started (68 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
Figure 6-40
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
234
Motor brakes with and without active compound braking
Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
SINAMICS G120C converter
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