More information
EN 60204‑1 defines "EMERGENCY SWITCHING OFF" and "EMERGENCY STOP" as actions
taken in an emergency. Further, it defines various stop categories for EMERGENCY STOP.
"EMERGENCY SWITCHING OFF" and "EMERGENCY STOP" minimize different risks in the
system or machine.
Table 6-77
The distinction between EMERGENCY OFF and EMERGENCY STOP
Action:
EMERGENCY SWITCHING OFF
EMERGENCY STOP
Stop Category 0 according to
EN 60204‑1
Risk:
Electric shock
Unexpected movement
Measure to minimize
risk:
Switch off
Either completely or partially switch off
hazardous voltages.
Prevent movement
Prevent hazardous movement.
Classic solution:
0
Switch off the drive power supply
Solution with the STO
safety function inte‐
grated in the drive:
Not possible.
STO is not suitable for switching off a
voltage.
Select STO
It is not necessary to switch off the
voltage to minimize risk.
6.3.11.2
Setting the feedback signal for Safe Torque Off
Overview
The converter signals that the STO safety function is controlled to the higher-level control
system using two digital outputs.
Advanced commissioning
6.3 Drive control
SINAMICS G120X converter
298
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC