Siemens SINAMICS G120 Operating Instructions Manual page 250

Advanced commissioning
6.7 Application-specific functions
With DC braking, the inverter outputs an internal OFF2 command for the time that it takes to
de-energize the motor p0347 - and then impresses the braking current for the duration of the
DC braking.
The DC-braking function is possible only for induction motors.
DC braking when falling below a start speed
DC braking initiated using a control command
Precondition: p1231 = 4 and p1230 = control
command, e.g. p1230 = 722.3 (control command
DC braking when falling below a starting speed
1. The motor speed has exceeded the starting speed.
2. The inverter activates the DC braking as soon as the motor speed falls below the starting
speed.
DC braking when a fault occurs
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.
250
Precondition: p1230 = 1 and p1231 = 14
via DI 3)
DC braking when a fault occurs
Precondition: Fault number and fault response
are assigned using p2100 and p2101
DC braking when switching off the motor
Precondition: p1231 = 5 or p1230 = 1 and p1231
Converter with CU230P-2 Control Units
Operating Instructions, 04/2015, FW V4.7 SP3, A5E34257946B AB
= 14