Delta VFD25AMS23ANSAA

Chapter 17 Safe Torque Off FunctionMS300
768
17-1 Basic Function Description
The MS300 series provides a Safe Torque Off (STO) function. The MS300 series uses dual-channel S1
and S2 signal inputs to turn off IGBT switching, further preventing the generation of motor torque in order
to achieve a safe stop. Refer to Figure 17-1 for the Safe Torque Off function circuit diagram.
The MS300 Safe Torque Off function meets the following international standards:
 ISO 13849-1: 2015 Category 3 PL d
 IEC 61508 SIL2
 EN 62061 SIL CL 2
 EN 60204-1 Category 0
Figure 17-1: The circuit diagram for the Safe Torque Off function