Siemens Sinamics G120P Operating Instructions Manual page 382

Functions
7.7 Application-specific functions
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 controller 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 controller switches the motor off (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
382
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: DC braking deactivated
•
1 signal: DC braking activated
•
DC braking configuration (factory setting: 0)
0 No function
4 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 1 = DC braking active
.10 1 = DC braking ready
.11 1 = DC braking selected
.12 1 = DC braking selection internally locked
.13 1 = DC braking for OFF1/OFF3
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A