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Functions
14.12 Safety Integrated
Description of function
IEC 60204‑1 defines EMERGENCY OFF and EMERGENCY STOP:
• EMERGENCY OFF and EMERGENCY STOP are actions taken in an emergency.
• EMERGENCY OFF and EMERGENCY STOP reduce different risks in a system or machine:
– EMERGENCY OFF reduces the risk of electric shock.
– EMERGENCY STOP reduces the risk of unexpected movement.
Table 14-89
The distinction between EMERGENCY OFF and EMERGENCY STOP
Action:
EMERGENCY OFF
Risk:
Measure to mini‐
Switch off voltage
mize risk:
Switch off hazardous voltages
completely or in part
Classic solution:
Switch off the voltage:
Solution with the
STO and SS1 are not suitable
STO or SS1 Safety In‐
for switching off an electric
tegrated Function
voltage.
integrated in the
drive:
658
EMERGENCY STOP
Stop category 0 according to
IEC 60204‑1
Electric shock
Prevent movement
Prevent any hazardous movement
Switch off the power supply of the
drive:
Select STO:
It is permissible that you switch off the converter power supply as well.
However, switching off the voltage is not required as a risk-reduction
measurement.
Unexpected motion
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
EMERGENCY STOP
Stop category 1 according to IEC
60204‑1
Motion
Stop movement
Stop hazardous movement and
prevent any restart.
Brake the motor and switch off the
drive power supply
Select SS1:
SINAMICS G220 converter
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