Activation Via Fault Response - Siemens Sinamics S120 Function Manual

Basic functions
6.10 Armature short-circuit braking, DC braking
Deactivation
If DC braking is deactivated by setting the signal source of p1230 to "0" and the ON
command is still active, then the drive returns to its selected operating mode.
The following is applicable:
● for servo control (with encoder):
● for vector control (with and without encoder):
● for U/f operation:
6.10.2.2

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 de-magnetization time (p0347) until
3. After p0347 has expired, DC braking starts for the period of time according to p1233.
6.10.2.3 Activation via OFF command
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.
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The drive returns to close-loop control after the demagnetization time has elapsed (p0347
can also be set to 0).
When the "flying restart" function is activated, the Motor Module is synchronized with the
motor frequency. The drive is then switched back into closed-loop controlled operation. If
the "flying restart" function is not activated, the drive can only be restarted from standstill.
In this case, for a new start you must wait until the drive has come to a standstill.
When the "flying restart" function is activated, the Motor Module is synchronized with the
motor frequency. The drive is then switched back to U/f operation. If the "flying restart"
function is not available, the drive can only be restarted from standstill. In this case, for a
new start you must wait until the drive has come to a standstill.
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.
NOTICE
For encoderless servo control, it is possible that operation cannot be continued after DC
braking has been completed. An OFF2 fault message is then output.
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions