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5b) Input 19 L.E.D. (light emitting diode) is not illuminating correctly on the PLC (Programmable Logic
Controller) indicates that the signal to the PLC input is missing or the PLC is defective.
• Check FUSE 2 on the main electrical panel
• Check wiring back to the tumbler junction box
• Check wiring back to the rear controls
• Check PLC (Programmable Logic Controller)
Refer to wiring diagrams:
• Main Electrical Panel Diagram
• Tumbler Junction Box Wiring Diagram
• Rear Panel Controls Wiring Diagram
• Retest; verify that the signal is operational
5. ”DOOR OPEN” Problem
A “DOOR OPEN” message is generated by either the heater, load, or unload doors. The following in-
formation will address the load and unload doors signals, since they are associated with the tumbler junction
box.
a) PROBABLE CAUSES;
1a) Wiring back to the PLC (Programmable Logic Controller).
DS1-B = LOAD DOOR SWITCH
DS2-B = UNLOAD DOOR SWITCH
b) POSSIBLE SOLUTIONS;
1b) For quick check of LOAD and UNLOAD signals on the PLC (Programmable Logic Controller)
perform the following:
• Remove factory air from the dryer
• With the Control Voltage “ON,” open the LOAD doors and locate the LOAD door switch actuator.
• Cycle the switch by hand and have someone watch PLC input indicator #6. It should go “ON”
when the switch is down.
• Open the UNLOAD doors and locate the UNLOAD doors switch actuator.
• Cycle the switch by hand and have someone watch PLC input indicator #7. It should go “ON”
when the switch is down. Do the associated L.E.D.’s (light emitting diodes) come “ON” when
the switch is down?