External Armature Short-Circuit Braking - Siemens SINAMICS S120 Function Manual
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Basic functions
6.11 Armature short-circuit braking, DC braking
6.11.1.2
External armature short-circuit braking
This function controls an external contactor via output terminals that then short-circuits the
motor windings through resistors.
Setting
The external armature short-circuit braking is activated via p1231 = 1 with contactor
feedback signal or via p1231 = 2 without contactor feedback signal.
Activation
The function is activated as follows:
● The signal source is set to a "1" signal by p1230
● The pulse inhibit is set
Pulse cancellation is first activated, then the external armature short-circuit braking initiated.
If the function has been triggered, r0046.4 indicates a "1".
Figure 6-3
Example of an activation:
1. The signal source of p1230 is set to a "1" signal
2. As a consequence, the display parameters of drive object Motor Module r1239.0 and
3. Pulse enable is deleted, and the contactor for the external braking is switched.
4. Braking starts as a result of the short-circuited armature
5. Braking is terminated by setting the signal source of p1230 to a "0" (as a consequence,
6. When the wait time p1237 expires, the pulses are enabled.
292
Pulse enable - signal characteristic of external armature short-circuit without contactor
feedback signal
r0046.4 also indicate a "1".
r1239.0 also indicates a "0" signal).
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
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