American Dryer Corp. ADS-464 II - Manual (Page 63)

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3a) The L.E.D.’s illuminating on the PLC (Programmable Logic Controller) indicate that the wiring to
the PLC is correct.
• Check that the respective outputs of the PLC are also illuminating when the FORWARD and
REVERSE buttons are being pressed.
PLC OUT PIN 1 = DRUM REVERSE
PLC OUT PIN 2 = DRUM FORWARD
• If output indicators are functional, however the tumbler (basket) doesn’t respond: Check wiring
on the MAIN ENCLOSURE PANEL (Refer to the ADS-464 MAIN PANEL WIRING
DIAGRAM)
3b) L.E.D.s (light emitting diodes) are not illuminating correctly on the PLC (Programmable Logic
Controller) indicate that the signal(s) to the PLC inputs are missing.
• Check FUSE 2 on the main electrical panel
• Check wiring back to the tumbler (basket) junction box
• Check wiring back to the rear controls
• Refer to the blueprints:
• Main electrical panel diagram
• Tumbler junction box wiring diagram
• Rear panel controls wiring diagram
• Retest
0 UNLOAD 1 Selection
e. PROBABLE CAUSES;
1) Rear panel disconnect plug
2) Defective switch
3) Wiring back to main electrical enclosure
f. POSSIBLE SOLUTIONS;
1) If the “O UNLOAD 1” switch doesn’t respond when selected:
• Verify that the rear panel controls disconnect plug is indeed connected. This disconnect plug
allows for the removal of the rear control panel for dryer servicing
2) Defective “O UNLOAD 1” Selector Switch