Chapter 14 Fault Codes and Descriptions
ME300
No. Display on LED Keypad Fault Name Fault Descriptions
76
STO
(STO)
Safe Torque Off function activates.
Action and Reset
Action condition Hardware detection
Action time Immediately act
Fault treatment parameter N/A
Reset method
Auto
When Pr.06-44＝1 and after STO error is cleared, it automatically
resets.
Manual
When Pr.06-44＝0 and after STO error is cleared, reset it manually.
Reset condition Reset only after STO error is cleared.
Record Yes
Cause Corrective Actions
The switch action of S1/+24V and
S2/+24V
Check the wiring of the S1 and S2 terminals.
External STO card is installed
incorrectly or pin fractures.
Check if STO card is correctly installed.
False trigger Reset the emergency switch (ON: activated) and cycle the power.
Insufficient external input voltage Check that the input voltage maintains at least 11V.
Hardware failure
After you make sure all the wiring is correct, if STO fault still exists after cycling
the power, please contact Delta.
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