Safety Integrated Basic Functions; Safe Torque Off (Sto) - Siemens SINAMICS G130 Manual

Safety Integrated Basic Functions

5.1

Safe Torque Off (STO)

General description
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 integrated in the Motor/Power Modules is the 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:
● Extended acknowledgment:
● A debounce function can be applied to the terminals of the Control Unit and the
Appropriate measures must be taken to ensure that the motor does not undesirably move
once the energy feed has been disconnected, e.g. against coasting down or for a
hanging/suspended axis, the "Safe Brake Control" (SBC) function should be enabled, also
refer to Chapter "Safe Brake Control".
Safety Integrated
Function Manual, 05/2010, A5E03264275A
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.
If STO is selected/deselected (and p9307.0/p9507.0 = 1 are set), safety messages, in
addition to fault messages, are also canceled automatically.
Motor/Power Module in order to prevent incorrect trips due to signal disturbances. The
filter times are set using parameters p9651 and p9851.
WARNING
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