Delta VFD4A8ME21ANNAA User Manual

Chapter 15 Safe Torque Off FunctionME300
15-10
15-7-2 Troubleshooting Instructions
Refer to the following instructions for troubleshooting when STO / STL1 / STL2 / STL3 appears on
the keypad. Refer to Chapter 14 Error Codes.
ID No.
Digital keypad
Display
Descriptions
72
S1–DCM internal loop detection error
Corrective Actions

Check the wiring of the S1 terminal.
 Reset the emergency switch (ON: activated) and cycle the
power.
 Check that the input voltage maintains at least 11 V.
 Check the wiring of the S1 and +24 V terminals.
 After you make sure all the wiring is correct, if STL1 fault still
exists after cycling the power, please contact Delta.
76
Safe Torque Off function active
Corrective Actions

Check the wiring of the S1 and S2 terminals.
 Reset the emergency switch (ON: activated) and cycle the
power.
 Check that the input voltage maintains at least 11 V.
 Check the wiring of the S1 / S2 and +24 V terminals.
 After you make sure all the wiring is correct, if STO fault still
exists after cycling the power, please contact Delta.
77
S2–DCM internal loop detection error
Corrective Actions

Check the wiring of the S2 terminal.
 Reset the emergency switch (ON: activated) and cycle the
power.
 Check that the input voltage maintains at least 11 V.
 Check the wiring of the S2 and +24 V terminals.
 After you make sure all the wiring is correct, if STL2 fault still
exists after cycling the power, please contact Delta.
78
S1–DCM & S2–DCM internal loop detection error
Corrective Actions
 After you make sure all the wiring is correct, if STL3 fault still
exists after cycling the power, please contact Delta.
Table 5: Digital keypad troubleshooting instructions

Delta VFD4A8ME21ANNAA Specifications

General

Brand	Delta
Model	VFD4A8ME21ANNAA
Category	DC Drives
Language	English