Siemens SINAMICS G120 Function Manual page 220

Operation
6.8 Safe Direction (SDI)
The feedback signal "SDI active" for pulse inhibit remains active
Procedure
To switch the motor on, proceed as follows:
1. Select STO (or SS1).
2. Deselect STO (or SS1) again.
3. After deselecting STO, wait until the inverter is "ready to switch on".
Alternatively: After deselecting STO, wait a certain time before switching on. We
recommend a wait time of 200 ms.
4. Switch on motor within 5 s after deselecting STO (ON command).
Figure 6-43
You have switched on the motor again.
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.
220
Switching the motor off and on when SDI is active
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 04/2014, FW V4.7, A5E34261271B AA