Siemens SINAMICS S120 Function Manual page 343

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
event of power failure or wire break, the motor should be operated in a safe state. The
feedback signal of DI 14 is inverted for this purpose. Digital input DI 14 is connected to
terminal 12 of terminal strip X132.
● DO 15 is used as switching output for the short-circuit contactor. 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.
Figure 7-4 Example of external armature short-circuit braking
Parameterization of the example:
1. Set p1231 = 1.
2. Define DI 14 as input with p0728.14 = 0.
3. Connect the feedback signal of the external armature short-circuit contactor with terminal
12 of terminal strip X132 (DI 14).
4. Interconnect p1235 with r0722.14.
5. Define DO 15 as output with p0728.15 = 1.
6. Connect the control signal for the external armature short-circuit contactor with terminal
13 of terminal strip X132 (DO 15).
7. Interconnect p0745 with r1239.0.
The parameterization of external armature short-circuit braking has now been completed.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
7.12 Armature short-circuit, DC braking
Basic functions
343