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Advanced commissioning
6.3 Drive control
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
Action:
Risk:
Measure to minimize
risk:
Classic solution:
Solution with the STO
safety function inte‐
grated in the drive:
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.
298
The distinction between EMERGENCY OFF and EMERGENCY STOP
EMERGENCY SWITCHING OFF
Electric shock
Switch off
Either completely or partially switch off
hazardous voltages.
Not possible.
STO is not suitable for switching off a
voltage.
EMERGENCY STOP
Stop Category 0 according to
EN 60204‑1
Unexpected movement
Prevent movement
Prevent hazardous movement.
Switch off the drive power supply
It is not necessary to switch off the
voltage to minimize risk.
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
Select STO
SINAMICS G120X converter
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