Chapter 14 Fault Codes and DescriptionsC2000 Plus
ID* Display on LCD Keypad Fault Name Fault Descriptions
77
STO Loss 2 (STL2) STO2–SCM2 internal loop detection fault
Action and Reset
Action condition Hardware detection
Action time Act immediately
Fault treatment parameter N/A
Reset method Hardware failure, and cannot reset. Cycle the power.
Reset condition N/A
Record Yes
Cause Corrective Actions
STO2 and SCM2 short circuit lines
are not connected
Connect the short circuit lines
Hardware failure
After you make sure all the wiring is correct, if STL2 fault still occurs after cycling
the power, please return to the factory for repair.
Poor connection of the IO card
Check if the PIN of IO card is broken.
Check if the IO card connects to the control board correctly, and if the screws are
tightened well.
The IO card does not match the
version of the control board
Contact local agent or Delta
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