Delta MS300 Series User Manual page 786

17-7-2 Troubleshooting Instructions
Refer to the following instructions for troubleshooting in Table 17-5 when STO / STL1 / STL2 / STL3
appear on the keypad (refer to Chapter 14 Fault Codes for details).
KPMS-LE01
ID No.
Keypad Display
72
76
77
78
Table 17-5 KPMS-LE01 Instrucstions for Troubleshooting
S1–DCM internal circuit detection error
Cause and Corrective Actions
S1 and DCM short circuit lines are not connected

 Re-connect the short circuit line.
 Hardware failure
 After you make sure all the wiring is correct, if STL1 fault still exists
after cycling the power, return to the factory for repair.
Safe Torque Off function active
Cause and Corrective Actions
The switch action of S1 / DCM and S2 / DCM (OPEN)

 Reset the switch (ON) and cycle the power.
S2–DCM internal circuit detection error.
Cause and Corrective Actions
 S2 and DCM short circuit lines are not connected
 Re-connect the short circuit line.
 Hardware failure
 After you make sure all the wiring is correct, if STL2 fault still exists
after cycling the power, return to the factory for repair.
Internal circuit detection error.
Cause and Corrective Actions
 S1 and DCM, or S2 and DCM short circuit lines are not connected
 Re-connect the short circuit line.
 Hardware failure
 After you make sure all the wiring is correct, if STL3 fault still exists
after cycling the power, return to the factory for repair.
777
Chapter 17 Safe Torque Off FunctionMS300
Descriptions