Siemens SINAMICS S120 Function Manual page 296

Basic functions
6.11 Armature short-circuit braking, DC braking
Example of external armature short-circuit braking
Before parameterizing external armature short-circuit braking, you have to create a new
project with a Motor Module and a motor. The following conditions must be fulfilled:
● A short-circuit contactor with an additional feedback signal contact is used (p1231 = 1).
● DI 14 is defined as the input for the feedback signal of the short-circuit contactor. In the
● DO 15 is used as switching output for the short-circuit contactor. In the event of power
Figure 6-4 Example of external armature short-circuit braking
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event of power failure or wire break, the motor should be operated in a safe state. The
feedback signal of DI 14 is inverted via p0723.14 for this purpose. Digital input DI 14 is
connected to terminal 12 of terminal strip X132.
failure or wire break, the motor should be operated in a safe state. To achieve this,
switching signal DO 15 is inverted. Digital output DO 15 is connected to terminal 13 of
terminal strip X132. Parameter r1239.0 indicates the status of the braking and issues the
signal for the contactor.
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions