Siemens SINAMICS G120 Function Manual page 198

Alarms, faults and system messages
6.2 Reaction of the safety functions to faults
Discrepancy during Extended Safety (activation via F-DI)
If you have selected activation both via F-DI and via PROFIsafe for Extended Safety , this
section does not apply, but instead the section above.
Figure 6-4
After the tolerance time has expired, the inverter signals the discrepancy with alarm C01770
or C30770.
To switch the motor on again, you must proceed as follows:
1. Rectify the discrepancy.
2. Acknowledge the active messages (see Section Acknowledging with a fail-safe signal or
3. Issue an OFF1 command.
4. Switch the motor on again (ON command).
196
Response of safety function STO in the event of a discrepancy
with a power on reset (Page 191)).
Note: In this case, it is not possible to acknowledge by selecting and deselecting STO.
Safety Integrated Function Manual, SINAMICS G120 and G120C
Function Manual, 01/2011, FW 4.4, A5E03052391B AB