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3.0 DOOR Open Problem
A DOOR OPEN message is generated by either the heater, the LOAD doors, or UNLOAD doors. The
following information will address the LOAD doors and the UNLOAD doors signals, since they are associated
with the tumbler (basket) junction box.
a. PROBABLE CAUSES;
1) WIRING BACK THE PLC (Programmable Logic Controller)
DS1-B=LOAD DOOR SWITCH
DS2-B=UNLOAD DOOR SWITCH
b. POSSIBLE SOLUTIONS;
1) For quick check of LOAD and UNLOAD signals of the PLC 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 (Programmable Logic Controller) input
indicator #7. It should go ON when the switch is down. Do the associated L.E.D.s (light
emitting diode) come ON when switch is down?
If YES, wiring is okay
Check switch placement and door actuation
If NO, check associated:
Switch and wiring
Check wiring back to the tumbler (basket) junction box
Check wiring back to the rear controls
Check PLC (Programmable Logic Controller)
Refer to the blueprints: Main Electrical Panel Diagram
Tumbler (basket) junction box diagram
Rear panel controls wiring diagram