Siemens SINAMICS G220 - Safe Stop 1 (SS1) - Overview

r9720.0...15 SI control word 
r9722.0...15 SI status signals 
c10022 SI STO input terminal 
r10352.0...17 SI STO select cause 
14.12.4.2 Safe Stop 1 (SS1) - overview
Overview
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Figure14-226 Overview SS1
Safe Stop 1 (SS1) stops a dangerous movement of a machine component.
Note
SS1 cannot be interrupted
• If SS1 is deselected again during this time, the STO function is selected and deselected again
by the drive immediately after the delay time has elapsed or the speed has dropped below the
shutdown speed. This terminates the SS1 function normally. It cannot be interrupted.
• During the delay time, SS1 cannot be deselected by withdrawing the control command,
therefore ful󹪝lling the requirements of EN 60204‑1 relating to an EMERGENCY STOP function
in stop Category 1.
Requirement
SS1 is enabled in the function selection.
WARNING
Unexpected motor movement through active Safe Torque O󹪜
There may be unexpected motor movements if the Safe Torque O󹪜 (STO) function is active. For
instance, the motor can coast down to a standstill or a hanging load may accelerate the motor.
Unexpected movements can lead to damage to property, risk to persons, severe injury and
death.
• Consider the functionality of the SS1 function in the risk assessment of the machine or plant.
• Prevent movements of the motor, for example, by using a holding brake.
Functions
14.12Safety Integrated
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 661