Siemens SINAMICS S120 Function Manual page 577

Danger through brief momentary movements
If two power transistors simultaneously fail in the power unit (one in the upper and one in
the lower bridge), then this can cause brief momentary movement.
The maximum movement can be:
• Synchronous rotary motors: Max. movement = 180 ° / No. of pole pairs
• Synchronous linear motors: Max. movement = pole width
● The status of the "Safe Torque Off" function is displayed using parameters (r9772, r9872,
Enabling the "Safe Torque Off" function
The "Safe Torque Off" function is enabled via the following parameters:
● STO via terminals:
● STO via PROFIsafe:
● STO via PROFIsafe and terminals:
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
WARNING
r9773 and r9774).
p9601.0 = 1, p9801.0 = 1
– p9601.0 = 0, p9801.0 = 0
– p9601.2 = 0, p9801.2 = 0
– p9601.3 = 1, p9801.3 = 1
– p9601.0 = 1, p9801.0 = 1
– p9601.2 = 0, p9801.2 = 0
– p9601.3 = 1, p9801.3 = 1
Safety Integrated basic functions
9.4 Safe Torque Off (STO)
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