Siemens SINAMICS G110M - 8.15 Safe Torque Off (STO) safety function

8.15 Safe Torque O󹪜 (STO) safety function
Overview
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An active STO function prevents energy from being fed to the motor. The motor can no longer
generate torque on the motor shaft.
Consequently, the STO function prevents the starting of an electrically-driven machine
component.
Requirement
The machine manufacturer has already performed a risk assessment, e.g. in compliance with
EN ISO 1050, "Safety of machinery - Principles of risk assessment". The risk assessment must
con󹪝rm that it is permissible to use the STO safety function.
Function description
Table 8-46 Principle of operation of STO
Safe Torque O󹪜 (STO) Standard converter functions linked with STO
1. The converter recognizes the selection of STO via
a safety-relevant input or via the PROFIsafe safe
communication.
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2. The converter interrupts the energy supply to the
motor.
If you use a motor holding brake, the converter
closes the brake.
3. The converter signals that "STO is active" via a
safety-relevant output or via the PROFIsafe safe
communication.
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Advanced commissioning
8.15 Safe Torque O󹪜 (STO) safety function
Distributed converter for SIMOGEAR geared motors
242 Operating Instructions, 10/2020, FW V4.7 SP13, A5E31298649B AL