Chapter 16 Safe Torque Off Function | VFD-ED
16-6 Fault Codes Related to STO
Second Most Recent Fault Record
Third Most Recent Fault Record
Fourth Recent Fault Record
Fifth Most Recent Fault Record
Sixth Most Recent Fault Record
Control Mode
VF VFPG SVC FOCPG FOCPM Default: 0
Settings 72: Safe torque loss (STL1)
76: Safe torque output stops (STO)
77: Safe torque loss 2 (STL2)
78: Safe torque loss 3 (STL3)
Fault Code Reading Description
72 (STL1) Safe torque loss (STL1) STO1–SCM1 internal circuit error.
76 (STO) Safe torque output stops (STO)
Safe Torque Off function is enabled while Pr.06-
49 is set to 0000h or 0002h.
77 (STL2) Safe torque loss 2 (STL2) STO2–SCM2 internal circuit error.
78 (STL3) Safe torque loss 3 (STL3)
STO1–SCM1 and STO2–SCM2 internal circuit
error.