American Dryer Corp. MLS-460 - Manual (Page 73)

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• Release the REVERSE Push-button
• Does PLC (Programmable Logic Controller) input L.E.D. #18 go “OFF”?
• If the answers to these questions are “YES,” wiring to the PLC is correct.
• If any answer to these questions is “NO,” refer to Probable Causes below
• Tumbler Forward Switch --- PB1
For quick check of the wiring of PB1 to the PLC (Programmable Logic Controller) perform the following
test with the control voltage “ON” (“green” button).
• Press the FORWARD Push-button.
• Does PLC (Programmable Logic Controller) input L.E.D. #17 light?
• Release the REVERSE Push-button.
• Does PLC (Programmable Logic Controller) input L.E.D. #17 go “OFF”?
• If the answer to these questions are “YES,” wiring to the PLC (Programmable Logic Controller) is
correct.
• If the answer to these questions are “NO,” refer to Probable Causes below
a. PROBABLE CAUSES;
1) FUSE 4 ON MAIN ELECTRICAL PANEL
2) FAULTY SWITCHES
3) WIRING BACK TO PLC (Programmable Logic Controller)
b. POSSIBLE SOLUTIONS;
1) Check fuse blown indicator on fuse 4; replace fuse, if necessary and retest.
2) Check switches using an OHM meter; replace if necessary, and retest.
3) Refer to MLS-460 Pendant associated wiring diagrams for detailed assembly and wiring information.
Check ALL circuits back to PLC (Programmable Logic Controller).
• MLS-460 PENDANT ASSEMBLY DIAGRAM
• MLS-460 ANNUNCIATOR, PENDANT, and UPPER RTD’S (Resistive Temperature Device)
WIRING DIAGRAM
• “EMERGENCY STOP” (E-Stop) SWITCH --- PB6
If the “EMERGENCY STOP” (E-Stop) switch (pendant) does not respond: