Siemens SINAMICS G120C Operating Instructions Manual page 331

The following occurs after an OFF1 or OFF3 command:
1. The motor brakes along the OFF1 or OFF3 deceleration ramp to starting speed p1234.
2. The converter de-energizes the motor for the motor de-excitation time p0347 in order to
demagnetize the motor.
3. The converter activates the DC braking.
4. After "DC braking duration" p1233 expires, the converter de-energizes the motor.
If the OFF1 command is deactivated before "DC braking duration" p1233 expires, the
converter terminates the DC braking and switches to normal operation.
DC braking as reaction to a fault
Figure 8-64
Set p2101[x] = 6 and p2100[x] to the corresponding fault code.
If you have defined the DC braking as a reaction to a fault, then the following will occur:
1. The converter brakes the motor with OFF1.
2. The converter de-energizes the motor for the motor de-excitation time p0347 in order to
demagnetize the motor.
3. The converter activates the DC braking.
4. After "DC braking duration" p1233 expires, the converter de-energizes the motor.
Parameter
Settings for DC braking
Parameter
p0347[M]
p1230[C]
p1231[M]
p1232[M]
p1233[M]
p1234[M]
r1239[8...13]
SINAMICS G120C Converters
Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
DC braking as a fault reaction
Description
Motor de-excitation time
BI: DC braking activation
Configuring DC braking
DC braking, braking current
DC braking duration
Speed at the start of DC braking
CO/BO: DC braking status word
Advanced commissioning
8.21 Electrically braking the motor
Factory setting
0 s
0
0
0 Arms
1 s
210000 rpm
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