Siemens Sinamics S110 Function Manual page 180

Drive functions
7.2 Basic functions
External armature short-circuit braking
The external armature short-circuit is activated by setting p1231 = 1 (with contactor feedback
signal) or p1231 = 2 (without contactor feedback signal). It can be triggered via an input
signal p1230 (signal = 1) or a fault response. Triggering takes place once the pulses have
been suppressed or the circuit breaker has been inhibited.
This function uses output terminals to control an external contactor, which can short-circuit
the motor terminals via external resistors, for example. An armature short-circuit brake has
the advantage of a higher braking effect than a mechanical brake at the start of braking (at a
high speed). However, since the braking effect fades away as the speed drops, we
recommend a combination of armature and mechanical braking.
For the function with contactor feedback signal, the feedback inputs of both command data
sets (CDS = 2) p1235[0..1] have to be wired.
The external armature short-circuit is only supported for rotary-type permanent-magnet
synchronous motors (p0300 = 2xx).
r0046.4
p1230
(0)
(r0046.19 = 1)
r0046.20
Figure 7-28 External armature short-circuit braking with/without contactor feedback signal
180
p1231 = 1
1
p1235
r0002 = 19
≥1
r1239.0
p1236 =
T
=1
p1237 = 200
0
1
DI
DO
200 ms
0
&
&
ms
T
+24 V
M
~
3
F07905
A07904
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
2000 µs
p1231 = 1
p1231 = 2
Drive functions