Delta VFD25AMS43ANSAA - 17-8 Test and Fault Confirmation

Chapter 17 Safe Torque Off FunctionMS300
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17-2 Safe Torque Off Terminal Function Description
Table 17-1 describes the STO (Safe Torque Off) related terminal functions.
Terminals
Terminal Function
Descriptions
+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
Table 17-2 describes the action logic and keypad display after the S1 / S2 signal input.
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 displayed on
the keypad
No error displayed
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 the 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
.