Siemens SINAMICS G120 Operating Instructions Manual page 220

Functions
8.9 Application-specific functions
Principle of operation after OFF2 or STO command
For the following signals, the brake closing time is not taken into account:
● OFF2 command
● For fail-safe applications, in addition, after "Safe Torque Off" (STO)
After these control commands, the signal to close the motor holding brake is immediately
output independent of the motor speed. The inverter does not monitor the motor speed until
the brake closes.
Figure 8-18
218
Controlling the motor holding brake after an OFF2 command or STO
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
SINAMICS G120C Inverter