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Wiring
4.2 Control interfaces
4.2.8
"Safe Torque Off" safety function
Overview
The "Safe Torque Off" (STO) safety function can be implemented using a failsafe digital input
of the converter.
Requirements
● Both switches on the converter for enabling/disabling STO are in the ON position.
● The higher-level control system monitors the selection of STO and the feedback from the
converter.
Function description
Use an SELV or PELV power supply with 24 V DC (20.4 V ... 28.8 V, maximum 60 V briefly).
Use a shielded cable with the following properties:
● Cable length ≤ 30 m
● Cross section 0.5 mm
● Insulated for 600 V
● Conductor end sleeves, stripping length 7 mm
Tightening torque: 0.2 Nm (2 lbf in)
128
Application examples for "Safe Torque Off" (Page 132)
... + 1.5 mm
2
(20 ... 16 AWG)
2
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
SINAMICS G120X converter
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