Delta VP3000 Series - Page 556

Chapter 8 Troubleshooting｜VP3000
547
ID No.
Fault Name
Descriptions
77
STO Loss 2
(STL2)
STO2–SCM2 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
STO2 and SCM2 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 STL2 still exists,
return to the factory for repair.