Chapter 14 Fault Codes and Descriptions
ME300
No. Display on LED Keypad Fault Name Fault Descriptions
77
S2 internal loop
detection error (STL2)
S2–DCM internal loop detection error
Action and Reset
Action condition Hardware detection
Action time Immediately act
Fault treatment parameter N/A
Reset method Hardware failure, and cannot reset. Cycle the power.
Reset condition N/A
Record Yes
Cause Corrective Actions
STO jumper cap is not installed or
is off.
Install the jumper cap.
External STO card S1 and +24V
short circuit line are not connected.
Check the wiring of the S1 and +24V terminals.
External STO card is installed
incorrectly or pin fractures.
Check if STO card is correctly installed.
Insufficient external input voltage Check that the input voltage maintains at least 11V.
False trigger Reset the emergency switch (ON: activated) and cycle the power.
Hardware failure
After you make sure all the wiring is correct, if STL2 fault still exists after cycling
the power, please contact Delta.
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