Delta MS300 Series User Manual page 778

17-2 Safe Torque Off Terminal Function Description
Table 17-1 describes the STO (Safe Torque Off) related terminal functions.
Terminals Terminal Function
When the STO function is not
used, you can disable the
+24 V
STO function by shorting S1
and S2 with + 24 V.
Signal input for STO function
S1
channel 1
Signal input for STO function
S2
channel 2
Reference ground for S1 and
DCM
S2 signal
Table 17-2 describes the action logic and keypad display after the S1 / S2 signal input.
Signal
S1–DCM
S2–DCM
Drive output
Error displayed on
the keypad
 STO means channel 1 and 2 operate simultaneously and enter Safe Torque Off.
 STL1 means channel 1 operates.
 STL2 means channel 2 operates.
STL3 means there is an error detected in the internal loop of the channel 1 or channel 2.

 S1–DCM / S2–DCM ON: means S1–DCM / S2–DCM inputs a power supply > 11 V
S1–DCM / S2–DCM OFF: means S1–DCM / S2–DCM inputs a power supply < 5 V

Output voltage range: +24 V ± 10%
Output voltage capacity: 100 mA
S1–DCM / S2–DCM
Rated input voltage: +24 V
maximum input voltage: +30 V
Rated input current: 6.67 mA ± 10%
STO activation mode
Input voltage level:
0 V
STO response time: ≤ 20 ms (time required for S1 / S2 to operate
until the drive stops outputting)
STO cut-off mode
Input voltage level:
11 V
Table 17-1: STO terminal function description
ON
ON
Ready to output
(Torque output off)
No error displayed
Table 17-2: Action logic and keypad display description
Chapter 17 Safe Torque Off FunctionMS300
Descriptions
DC
< S1–DCM < 5 V or 0 V
DC DC
< S1–DCM < 30 V
DC DC
Status
ON
OFF
STL2 mode
(Torque output off)
STL2
769
± 10%;
± 10%
DC
< S2–DCM < 5 V
DC
and 11 V < S2–DCM < 30 V
DC
OFF
ON
STL1 mode STO mode
(Torque output off)
STL1
.
DC
.
DC
DC
DC
OFF
OFF
STO