Siemens SINAMICS G120 Operating Instructions Manual page 321

DC braking when a fault occurs
DC braking initiated by a control command
DC braking when the motor is switched off
Converter with the CU250S-2 Control Units
Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG
Advanced commissioning
6.22 Electrically braking the motor
Requirement:
Fault number and fault response are assigned
via p2100 and p2101.
Function:
1. A fault occurs, which initiates DC braking as
response.
2. The motor brakes along the down ramp to
the speed for the start of DC braking.
3. DC braking starts.
Requirement:
p1231 = 4 and p1230 = control command, e.g.
p1230 = 722.3 (control command via DI 3)
Function:
1. The higher-level control issues the
command for DC braking, e.g. using DI3:
p1230 = 722.3.
2. DC braking starts.
If the higher-level control withdraws the com‐
mand during DC braking, the inverter interrupts
DC braking and the motor accelerates to its
setpoint.
Requirement:
p1231 = 5 or p1230 = 1 and p1231 = 14
Function:
1. The higher-level control switches off the
motor (OFF1 or OFF3).
2. The motor brakes along the down ramp to
the speed for the start of DC braking.
3. DC braking starts.
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