Siemens SINAMICS G120 Function Manual page 174

Operation
6.4 Safe Brake Control (SBC)
Selecting SS1 when the motor is rotating
Function
1. The higher-level control selects the SS1 function
2. The inverter brakes the motor with the OFF3 ramp-down time.
3. The inverter closes the motor holding brake once the motor is at a standstill.
4. If the standstill monitoring is undershot, or once the delay time has expired, the inverter
activates the STO function and controls the brake with the SBC function.
Figure 6-11
Before you can switch on the motor again, you must deselect the SS1 function.
174
When selecting SS1, the motor holding brake closes at standstill
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 04/2014, FW V4.7, A5E34261271B AA