Siemens SINAMICS S120 - External Armature Short-Circuit Braking

Basic functions
7.12 Armature short-circuit, DC braking
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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Deactivation
The function is deactivated if the signal source of p1230 is set to a "0". When triggered by a
fault, the fault must have been removed and acknowledged.
7.12.1.2
External armature short-circuit braking
This function controls an external contactor via output terminals that then short-circuits the
motor windings through resistors.
Requirement
● Short-circuit-proof motors (p0320 < p0323):
Use only short-circuit proof motors, or use suitable resistors to short-circuit the motor.
● One of the following motor types is used:
– rotating permanent-magnet synchronous motor (p0300 = 2xx)
– linear permanent-magnet synchronous motor (p0300 = 4xx)
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 7-3 Pulse enable - signal characteristic of external armature short-circuit without contactor
feedback signal