Fail-Safe Function Safe Torque Off (Sto); Functional Description - Siemens SINAMICS G120 Operating Instructions Manual

Functions

9.10 Fail-safe function Safe Torque Off (STO)

9.10 Fail-safe function Safe Torque Off (STO)
These operating instructions describe the commissioning of the STO safety function when it
is controlled via a fail-safe digital input.
You will find a detailed description of all safety functions and control using PROFIsafe in the
Safety Integrated Function Manual, see Section Further information on your inverter
(Page 340).
9.10.1

Functional description

Definition according to EN 61800-5-2:
"The STO function prevents energy from being
supplied to the motor, which can generate a
torque."
Examples of how the function can be used
Example
When the Emergency Stop button is pressed, it is
not permissible that a stationary motor undesirably
starts.
A central Emergency Stop button ensures that
several drives cannot unintentionally start.
228
STO
Solution option
Wire the Emergency Stop button with a fail-

safe input.
Select STO via the fail-safe input.

Evaluating an Emergency Stop pushbutton

in a central control.
Select STO via PROFIsafe.

SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB