Safety Integrated Basic Functions; Safe Torque Off (Sto) - Siemens SINAMICS S120 Function Manual

Safety Integrated Basic Functions

Note
The Basic Functions are also described in the following manual:
Reference: /FH1/ SINAMICS S120 Function Manual Drive Functions.
4.1

Safe Torque Off (STO)

In conjunction with a machine function or in the event of a fault, the "Safe Torque Off" (STO)
function is used to safely disconnect the torque-generating energy feed to the motor.
When the function is selected, the drive unit is in a "safe status". The switching on inhibited
function prevents the drive unit from being restarted.
The two-channel pulse suppression function integrated in the Motor Modules / Power
Modules is a basis for this function.
Functional features of "Safe Torque Off"
● This function is integrated in the drive; this means that a higher-level controller is not
● The function is drive-specific, i.e. it is available for each drive and must be individually
● The function must be enabled using parameters.
● When the "Safe Torque Off" function is selected, the following applies:
● By selecting/deselecting STO, if p9307.0/p9507.0 are set to 1, in addition to the fault
● A debounce function can be applied to the terminals of the Control Unit and the Motor
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
required.
commissioned.
– The motor cannot be started accidentally.
– The pulse suppression safely disconnects the torque-generating energy feed to the
motor.
– The power unit and motor are not electrically isolated.
messages, the safety messages are also automatically withdrawn.
Module in order to prevent incorrect trips due to signal disturbances. The filter times are
set using parameters p9651 and p9851.
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