07610-002-41-09-F
19
GENERAL
DESCRIPTION
GENERAL DESCRIPTION: The timer is a self-contained (frame mounted) timer of the
repeating cycle type. It is mounted on the control panel of the control box to control
the automatic functions of the machine. It consists of a clock motor which operates on
60 cycle AC, 220 VAC. In addition to the clock motor, the timer contains a driven cam
arrangement which operates three microswitches.
The timer controls various operations of the dishmachine as per the wiring diagrams
for each machine. However, the timing cycle and the microswitches are the same for
each model. The time for one complete revolution of the cam shaft is approximately
150 seconds, allowing two wash and two rinse operations for each complete revolu-
tion of the cam shaft. The microswitch nearest the timer motor is the hold circuit and
uses both the NO and NC contacts. The middle microswitch controls the wash and
uses the NO contact. The switch farthest away from the timer motor controls the rinse
and uses just the NC contact.
Timer operation can be observed after removing the control panel from the control
box by loosening the four screws holding it. Hang the control panel using the two
right-hand screws with the back side of the panel outward.
If it is determined that the timer is defective, it is recommended that a new timer be in-
stalled. However, limited
fi
eld maintenance can be accomplished as follows: a frozen
contact on a microswitch will be indicated by one function being executed all the time
or the absence of a click when the switch arm is actuated. To replace microswitch:
1. Remove all wires from the timer and properly tag them to assure proper
replacement.
2. Remove the two screws which hold the timer to the control panel.
3. One screw holds the microswitches, cams, and actuating arms in the frame.
The screw is seen on the side opposite the motor. Remove this screw.
NOTE: Be sure to note which cam goes with which microswitch. The cam
nearest timer motor has 1/2 raised, cam center, and largest depressed
areas, and the cam farthest from timer motor has the smallest depressed
areas.
4. The unit can now be taken apart and the defective microswitch replaced.
5. Reassemble. NOTE: The
fl
anges on the cams are such that they only mesh in
one direction. The shorter
fl
ange on the cams always points toward the drive
motor.
The timer’s cam drive system is equipped with a clutch to enable user to view the
operations of the cams and microswitches. Remove power to the machine BEFORE
touching the timer. Rotate the cams by turning with
fi
ngers; cam will turn in one di-
rection only. Do not force them. As cams actuate switches, listen for the click of the
switch or test the switches with an ohm-meter. A defective motor is indicated by the
fact that the cams do not rotate or the machine does not perform the automatic...
PRINCIPLE OF
OPERATION
SERVICE
INSTRUCTIONS
CAUTION:
Always remove the power
to the machine before
working on the control
panel or while servicing
the components on the
switch panel. All electrical
checks should be made by
quali
fi
ed personnel.
TIMER FOR 10 SERIES DISHMACHINES
SERVICE
PROCEDURES