Advanced commissioning
6.11 Safe Torque Off (STO) safety function
Converter with the control units CU240D-2
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF
151
The STO function is suitable for achieving an emergency stop but not an emergency off.
Risk:
Risk of electric shock:
Risk of unexpected motion:
Measure to minimize
risk:
Safe switch off
Switching off the electric power sup-
ply for the installation, either com-
pletely or partially.
Safely stop and safely prevent re-
starting
Stopping or preventing the dangerous
movement
Command:
Emergency Off
Emergency Stop
Classic solution:
Switch of the power supply:
Switch-of the drive power supply:
Solution with the STO
safety function inte-
grated in the drive:
STO is not suitable for safely switch-
ing of an electric voltage.
Select STO:
It is permissible that you switch of the
inverter supply voltage as well. How-
ever, switching off the voltage is not
required as a risk-reduction meas-
urement.