Chapter 3 Electrical Wiring｜VP3000
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3-5 Safe Torque Off
3-5-1 Basic Function
The VP3000 series provide a Safe Torque Off (STO) function, through the dual-channel STO_1 and
STO_2 signal input to turn off the IGBT switching, prevent the motor from generating torque, so as to
achieve the purpose of safe stop. Refer to Figure 3-43 for STO circuit diagram.
VP3000 STO function comply with the following regulations:
⚫ ISO 13849-1:2015 Category 3 PL e
⚫ IEC 61508 SIL3
⚫ EN 62061 SIL CL 3
⚫ EN 60204-1 Category 0
Figure 3-43
3-5-2 STO Failure Rate
Refer to the table below for the safe parameters of STO function:
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