Activation Via Fault Response - Siemens SINAMICS S120 Function Manual

The following applies:
● For servo control (with encoder):
The drive returns to close-loop control after the demagnetization time has elapsed (p0347
can also be set to 0).
● For vector control (with and without encoder):
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.
● For V/f control:
When the "flying restart" function is activated, the Motor Module is synchronized with the
motor frequency. The drive is then switched back to V/f control. 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.
7.12.2.2

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
the braking ramp corresponds to the gradient of the down ramp (can be set using p1121).
2. The pulses are inhibited for the duration of the motor demagnetization time (p0347) until
the magnetic field in the motor has decayed.
3. After p0347 has expired, DC braking starts for the period of time according to p1233.
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.
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.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
7.12 Armature short-circuit, DC braking
Basic functions
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