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4. 0 UNLOAD 1 Selection
a) PROBABLE CAUSES;
1a) Rear Panel Disconnect Plug.
2a) Defective Switch.
3a) Wiring Back to Main Electrical Enclosure.
b) POSSIBLE SOLUTIONS;
1b) If the O UNLOAD 1 Switch does not 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 drying servicing.
2b) Defective O UNLOAD 1 Selector Switch
• Shut power off at the main breaker and remove the rear panel and check switches using an OHM
meter; replace if defective.
3b) Wiring Back to the Main Electrical Enclosure
• With the control voltage “ON” Front Panel Green Button
• Select “1” on the “O UNLOAD” switch located on the rear control panel. Does the PLC
(Programmable Logic Controller) IN PIN 19 = UNLOAD, REAR PANEL light?
• If yes, refer to paragraph 3a on page 76.
• If no, refer to paragraph 4b on page 76.
4b) The L.E.D. (light emitting diode) “ON” on the PLC (Programmable Logic Controller) indicates are
also illuminating when the O UNLOAD 1 selector switch is on “1”.
PLC OUT PIN 7 = UNLOAD DOOR (OPEN)
PLC OUT PIN 10 = FRONT UP
• If output indicators are functional, however the UNLOAD DOORS or FRONT UP commands
are not executed correctly:
• Check wiring on the MAIN ENCLOSURE PANEL (refer to the ML-460 MAIN PANEL
WIRING DIAGRAM)
• Check wiring associated with the Solenoid Junction Box
• Refer to troubleshooting procedures associated with the Solenoid Junction Box