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C. TUMBLER (Basket) SECTION ELECTRICAL MALFUNCTIONS
Introduction
There are a number of electrical components associated with the tumbler (basket) section. These components
are ALL interfaced to the tumbler junction box, and connected to the main electrical enclosure through a
disconnectable cable.
The “tumbler junction box” is located on the left side of the tumbler (basket) section, in the same area as the left
drum motor. The title of the wiring diagram for the tumbler (basket) section is “Tumbler Electrical Junction Box
Wiring Diagram.”
The tumbler (basket) section electrical components provide:
•FRONT and REAR DOOR INFORMATION
•DRUM ROTATION INFORMATION
•REAR PANEL CONTROLS FOR UNLOADING
•EMERGENCY STOP (E-Stop)
The following information will provide a means to respond to fault messages associated with the tumbler (basket)
section, and verify ALL the electrical signals associated with it.
1. Tumbler (Basket) Section Electrical Components
a) Load Door Switch - DS1
The load door switch is located on the left side of the dryer’s front doors and is comprised of four (4)
parts; head, arm, body, and cord grip device. The head is a rotating type, with a spring arm attached for
switch actuation. The body contains a double-pole-double-throw (DPDT), normally open switch. DS1 -
has two (2) electrical functions, “A” and “B.”
b) Unload Door Switch - DS2
The unload door switch is located on the right side of the dryer’s rear doors and is comprised of four (4)
parts; head, arm, body, and cord grip device. The head is a rotating type, with a spring arm attached for
switch actuation. The body contains a double-pole-double-throw (DPDT), normally open switch. DS1 -
has two (2) electrical functions, “A” and “B.”
“A” provides rear door position signal to the PLC (Programmable Logic Controller).
“B” is a rear interlock to the burner controller circuit.
c) Drum Rotation Sensor – PRS1
The drum rotation sensor is an inductive pick up device located on the left wrapper of the tumbler (basket)
section. Its function is to sense a metal “target” attached to the “basket” as it rotates. The mechanical
adjustment of this device, (distance from the target) is crucial (3/16” maximum from target).
CAUTION: DO NOT MECHANICALLY ADJUST THE ROTATIONAL SENSOR SO FAR IN
TO BE HIT BY THE ROTATING TARGET, PERMANENT DAMAGE OF THE
SENSOR WILL OCCUR.