Further information
In order to prevent inadvertent inhibition of the "STO" function in the FSA ... FSC converter, we
recommend protecting the associated switch with a cable tie.
Figure 4-26 Protection against inadvertent inhibition of the "STO" function, FSA … FSC
4.2.9 Application examples for "Safe Torque Off"
Overview
A higher-level control system is required to select the STO safety function.
Preconditions
Basic prerequisites
● The digital outputs for the feedback of STO are correctly parameterized.
Setting the feedback signal for Safe Torque Off (Page 298)
● The higher-level control system monitors the selection of the STO safety function and the
feedback from the converter.
● Forced checking procedure (test stop):
The higher-level control system regularly selects the STO safety function and evaluates the
converter feedback signal.
We recommend that you implement a time monitoring function in the higher-level control
system, which issues an alarm if a test stop is overdue.
Wiring
4.2 Control interfaces
SINAMICS G120X converter
132 Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
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