Outline Description Of Safe Torque Off (Sto) - Panasonic MINAS-A5B Series Technical Reference

Standard specification parts (having part numbers ended with "A1") can't be used due to no safety function incorporated.
This chapter deals with special specification parts (having part numbers ended with 2 numeric characters) with safety
functions.

8-1 Outline description of safe torque off (STO)

The safe torque off (STO) function is a safety function that shuts the motor current and turns off motor output torque
by forcibly turning off the driving signal of the servo driver internal power transistor. For this purpose, the STO uses
safety input signal and hardware (circuit).
When STO function operates, the servo driver turns off the servo ready output signal (S-RDY) and enters safety state.
This is an alarm condition and the 7-seg LED on the front panel displays the error code number.
• PFH value of the safety function: 2.30 × 10
R1.05
24V
Safety
switch
Servo driver
Contact
SF1+
output
Safety input
SF1-
SF2+
Safety input
SF2-
0V
EDM+
EDM
EDM-
output
-8
Motor Business Division, Appliances Company, Panasonic Corporation
No. SX-DSV02472 -
122-
M