Activation Via Fault Response; Activation Via Off Fault Responses - Siemens SINAMICS S120 Function Manual

6.11.2.2

Activation via fault response

If DC braking is activated as fault response, then the following responses are executed:
1. The motor is braked along the braking ramp up to the threshold in p1234. The gradient of
2. The pulses are inhibited for the duration of the motor demagnetization time (p0347) until
3. After p0347 has expired, DC braking starts for the period of time according to p1233.
Note
For encoderless servo control, it is possible that operation cannot be continued after DC
braking has been completed. An OFF2 fault response is then output.
6.11.2.3

Activation via OFF fault responses

Setting as a response to OFF fault signals
With p1231 = 5, DC braking is set as a response to OFF1 or OFF3. Parameter p1230 has no
influence on the response for OFF1/OFF3. The speed threshold is set with p1234, under
which DC braking is activated.
Activation using OFF1/OFF3
DC braking is activated with OFF1 or OFF3.
● If the motor speed ≥ p1234, the motor is braked down to p1234. As soon as the motor
● If the motor speed at OFF1/OFF3 is already < p1234, the pulses are immediately
DC braking is then activated for the duration p1233 and is then switched off.
When OFF1/OFF3 is prematurely canceled, then normal operation is resumed.
DC braking as emergency braking of a fault response remains active.
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
the braking ramp corresponds to the gradient of the down ramp (can be set using p1121).
the magnetic field in the motor has decayed.
If an encoder is being used, the braking operation lasts until the speed falls below the
zero speed threshold set in p1226. If an encoder is not being used, braking lasts until the
time set in p1233 has expired.
speed is < p1234, the pulses are disabled and the motor is demagnetized.
inhibited and the motor is demagnetized.
6.11 Armature short-circuit braking, DC braking
Basic functions
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