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3.6.12
Safe Torque Off
"Safe Torque Off" is a function that prevents the drive from restarting unexpectedly according
to EN 60204-1, Section 5.4. The safety-related STO function is integrated in the drive, and is
independent of the operating functions of the drive.
In the event of an error or in conjunction with a machine function, this function is used to safely
disconnect the torque-generating motor power supply.
There are 2 independent switch-off signal paths. Both switch-off signal paths are low active.
This ensures that the system is always switched to a safe status if a component fails or in the
event of cable breakage.
When the "Safe Torque Off" function is selected, the following apply:
● The motor cannot be started accidentally.
● The pulse disable safely disconnects the torque-generating motor power supply.
● The Motor Module and the motor are not electrically isolated.
Note
The function is drive-independent. A higher-level controller is not required.
The safety function fulfills the requirements of Safety Integrity Level (SIL) 2 to IEC 61508,
Part 1-4, Category 3 acc. to EN ISO 13849-1, as well as those of the Performance Level (PL)
d according to EN ISO 13849-1. "Safe Torque Off" corresponds to stop Category 1 according
to EN 60204-1. This certification serves as the guidelines for integration of option K80 "Safe
Torque OFF". This certification can only be used if all the specified boundary conditions have
been satisfied in accordance with requirements. In addition to this, we recommend that
acceptance testing of the implemented overall function is performed by an authorized
inspectorate.
3.6.12.1
Safety information regarding the "Safe Torque Off / safe standstill" function
Safety instructions
Unexpected start up of the drive following deactivation of the "Safe Torque Off / Safe
Standstill" function
If the "Safe Torque Off / Safe Standstill" function is deactivated then the drive can start up
unexpectedly.
Death, serious injury, or material damage can result.
● Ensure that the "Safe Torque Off / Safe Standstill" function is clearly deactivated.
● Remove the "Safe Torque Off" mushroom pushbutton and press the "Safe Torque Off"
SINAMICS SM150 6SL3815-7NP41-0AA1
Operating Instructions Rev.201910281301 EXAMPLE
WARNING
button to make clear that the "Safe Torque Off / Safe Standstill" function is deactivated.
Description
3.6 Description of options
49
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