Jackson MSC 10AB-N70, Инструкция по установке и эксплуатации

Страница: 31 / 116

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, 120 VAC. In addition to the clock motor, the timer also contains a driven cam
arrangement which operates three microswitches.
PRINCIPLE OF OPERATION: The timer controls various operations of the dishmachine as per the wiring dia-
grams 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 revolution 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.
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 QUALIFIED PERSONNEL.
Timer operation can be observed after removing the front panel from the remote controller 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 installed. However, limited field
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. The microswitch is replaced by:
Remove all wires from the timer, properly tag them to assure proper replacement.
Remove the two screws which hold the timer to the control panel.
One screw holds the microswitches, cams and actuating arms in the frame. This screw is seen on the side opposite the
motor. Remove this screw. NOTE: Be sure to note which cam goes with which microswitch. Cam nearest timer motor has
1/2 raised, cam cen-ter, larger depressed areas, cam farthest from timer motor, smallest depressed areas.
The unit can now be taken apart and the defective microswitch replaced.
Reassemble. NOTE: The flanges on the cams are such that they only mesh in one direction. The shorter flange on the
cams always points toward the drive motor.
The timers cam drive system is equipped with a clutch to enable one to view the operations of the cams and
microswitches. Remove power to the machine BEFORE touching the timer. Rotate the cams by turning with fingers; cam
will turn in one direction only. Do not force them. As cams actuate switches, listen for the click of the switch or test the
switches with an ohm-meter.
26
Page Created: 09-10-2012
Revised: N/A
Technical Manual (07610-003-97-40)
SERVICE INSTRUCTIONS FOR THE TIMER
Mircoswitch part #
05945-306-02-00
TIMER, 120v part #
05945-003-95-37