Siemens SINAMICS G120 Operating Instructions Manual page 251

DC braking initiated by a control command
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 command during DC braking, the inverter interrupts
DC braking and the motor accelerates to its setpoint.
DC braking when the motor is switched off
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.
Settings for DC braking
Parameter
p0347
p1230
p1231
p1232
p1233
p1234
r1239
Converter with CU230P-2 Control Units
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB
Description
Motor de-excitation time (calculated after the basic commissioning)
The inverter can trip due to an overcurrent during DC braking if the de-excitation time is
too short.
DC braking activation (factory setting: 0)
Signal source to activate DC braking
0 signal: Deactivated
•
1 signal: Active
•
Configuring DC braking (factory setting: 0)
0 No DC braking
4 General release for DC braking
5 DC braking for OFF1/OFF3
14 DC braking below the starting speed
DC braking braking current (factory setting 0 A)
DC braking duration (factory setting 1 s)
DC braking start speed (factory setting 210000 rpm)
DC braking status word
.08 DC braking active
.10 DC braking ready
.11 DC braking selected
.12 DC braking selection internally locked
.13 DC braking for OFF1/OFF3
Advanced commissioning
6.7 Application-specific functions
251