Delta VP3000 Series - Page 554

Chapter 8 Troubleshooting｜VP3000
545
ID No.
Fault Name
Descriptions
72
STO Loss 1
(STL1)
STO1–SCM1 internal loop detection error
Action and Reset
Action Condition
Hardware detection
Action Time
Immediately act
Fault Treatment Parameter
No
Reset Method
Hardware failure and cannot be reset. Cycle the power.
Reset Condition
No
Record
Yes
Cause
Corrective Actions
STO1 and SCM1 short circuit lines
are not connected
Connect the short circuit line.
Hardware failure
Make sure all the wiring is correct and cycle the power. If the STL1 still exists,
return to the factory for repair.