Safe Torque Off - Siemens Sinamics S110 Function Manual

Safety Integrated Functions
8.5 Safety Integrated Extended Functions
Safety Integrated Extended Functions "without encoder" must not be used if the motor,
after it has been switched off, can still be accelerated by the mechanical elements of the
connected machine component.
Whether or not a mechanical brake is installed is irrelevant here.
Examples:
1. For the hoisting gear of a crane, the suspended load can accelerate the motor as soon as
2. A horizontal conveyor is always braked to a standstill due to friction as soon as the motor
8.5.2

Safe Torque Off

In addition to the control options specified under Safety Integrated Basic Functions, "Safe
Torque Off (STO) under Safety Integrated Extended Functions can also be activated via
PROFIsafe.
Functional features of "Safe Torque Off"
The functionality of "Safe Torque Off (STO)" is described in the section, "Safety Integrated
Basic Functions".
364
CAUTION
the motor is switched off. In this case, the safety functions "without encoder" are not
permitted.
Even if the mechanical brake of the hoisting gear is generally applied after the motor has
been switched off, the use of safety functions "without encoder" in this application is still
prohibited.
is switched off. In this case, the safety functions "without encoder" can be used without
any restriction.
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
Function Manual