No. SX-DSV02472 -
122-
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).
Safety input
EDM
output
Servo driver
Contact
output
0V
24V
SF1+
SF2+
SF2-
EDM+
EDM-
Safety
switch
M
SF1-
Safety input
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
-8
R1.05
Motor Business Division, Appliances Company, Panasonic Corporation