7.4.0 CONTROL SYSTEM
(See Figure 7.4)
The timer (1) consists of a drive motor and seven cams. These cams open and close seven
switches which control most functions of the machine.
Switch #1 (LS1) controls the timer motor. When the machine is off and the timer is in its neutral
position, no power is supplied to the timer motor. When the machine cycle starts, Switch #1 is
activated and the timer motor drives the cams through their cycle.
Switch #2 (LS2) supplies power to the MOTOR RELAY which powers the main motor windings.
Switch #3 (LS3) activates either the forward or reverse motor start windings through the MOTOR
START RELAY.
Switch #4 (LS4) controls the Solenoid Valve which supplies fresh water to the machine. Its cam
is adjustable in order to control the starting point of the purge cycle and the water level.
Switches #5 (LS5), #6 (LS6), and #7 (LS7) control the detergent (RED), sanitizer (GREEN) and
rinse-aid (BLUE) metering pumps respectively. The cams which operate these switches are also
adjustable.
R1, the Instant Start Relay (2) supplies power to the timer and pump motors for approximately
one second after the cycle start button is depressed. This allows time for Cam #1 to actuate.
R2, the Cycle Resume Relay (3) restarts the timer motor when the water level is near its proper
point. Water continues to flow for several seconds and this time is adjustable to provide the exact
water level required.
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