•Shut power off at the main breaker and remove the rear panel and check switches using an OHM meter; replace if defective
3)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 PLC (Programmable Logic Controller) IN PIN 19 = UNLOAD, REAR PANEL light?
•If “YES,” refer to section 3a
•If “NO,” refer to section 3b
3a) 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 of FRONT UP commands are not executed correctly:
•Check wiring on the MAIN ENCLOSURE PANEL (Refer to the
•Check wiring associated with Solenoid Junction Box.
•Refer to troubleshooting procedures associated with the Solenoid Junction Box.
3b) Input 19 L.E.D. (light emitting diode) 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 (basket) junction box
•Check wiring back to the rear controls
•Check PLC
•Refer to the blueprints
•Main electrical panel diagram
•Tumbler junction box wiring PLC (Programmable Logic Controller) diagram
•Rear panel controls wiring diagram
•Retest; verify that the signal is operational
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