Siemens Sinamics G120 Function Manual page 287

You have not switched on the motor within 5 seconds
If you do not switch on the motor within 5 seconds after deselecting STO, the following happens:
● The inverter goes back into the STO state.
● The inverter no longer responds to the ON command.
● The inverter outputs Alarm A01795.
To switch on the motor you must repeat the procedure described above.
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 01/2017, FW V4.7 SP6, A5E34261271B AD
Operation
6.8 Safe Direction (SDI)
287