Siemens SINAMICS G120 CU230P-2, Operating Instructions Manual, Page: 231 / 346

Functions
7.9 Application-specific functions
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
229
The following operating modes are available for DC braking.
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DC braking when the start speed for DC braking is fallen below
DC braking is automatically activated as soon as the motor speed falls below the start speed
for DC braking. However, the motor speed must have first exceeded the start speed for DC
braking. Once the DC braking time is complete, the inverter switches to normal operation. If
p1230 is set to 0, DC braking can also be canceled before the time defined in p1233.
DC braking when a fault occurs
If a fault occurs, where the configured response is DC braking, then the inverter first brakes
the motor along the down ramp until the start speed for DC braking is reached, and then
starts DC braking.