Delta MH300 Series - 17-2 Safe Torque Off Terminal Function Description

Chapter 17 Safe Torque Off FunctionMH300
17-3
17-2 Safe Torque Off Terminal Function Description
STO (Safe Torque Off) related terminal functions are shown as Table 17-1.
Terminals Terminal Function Description
+24 V
When the STO function is
not used, you can disable
the STO function by
shorting S1 and S2 with +
24 V.
Output voltage range: +24 V ±10%
Output voltage capacity: 100 mA
S1
Signal input for STO
function channel 1
S1–DCM / S2–DCM
Rated input voltage: +24 V
DC
±10%; maximum input voltage:
+30 V
DC
±10%
Rated input current: 6.67 mA ±10%
STO activation mode
Input voltage level: 0 V
DC
< S1-DCM < 5 V
DC
or 0 V
DC
< S2-DCM < 5 V
DC
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
DC
< S1-DCM < 30 V
DC
and 11 V
DC
< S2-DCM < 30 V
DC
S2
Signal input for STO
function channel 2
DCM
Reference ground for S1
and S2 signal
Table 17-1 STO terminal function description
The ac
tion logic and keypad display after the S1 / S2 signal input are shown as Table 17-2.
Signal Status
S1–DCM ON ON OFF OFF
S2–DCM ON OFF ON OFF
Drive output Ready to output
STL2 mode
(torque output off)
STL1 mode
(torque output off)
STO mode
(torque output off)
Error displays on
keypad
No error displays STL2 STL1 STO
Table 17-2 Action logic and keypad display description
 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 channel 1 or channel 2.
 S1
–DCM / S2–DCM ON: means S1–DCM / S2–DCM inputs a power supply > 11 V
DC
.
 S1–DCM / S2–DCM OFF: means S1–DCM / S2–DCM inputs a power supply < 5 V
DC
.