Solenoid Drive Board; Computer Assembly - Wayne Vista Series Service

3.2. LIGHTED CASH/CREDIT INTERFACE BOARD (LIGHTED SELECT BUTTONS), continued
This board contains a four position DIP switch which must be set correctly in order for
the display to operate; the settings are as follows:
Position 1
Position 2
Position 3
Position 4
3.3.

SOLENOID DRIVE BOARD

The solenoid drive board primarily serves as an AC switching board. By utilizing solid
state relays it can control AC power to the pump motor relays and two stage actuator
valves. Also, the solenoid drive board enables the correct pulser assembly by switching
the pulser select (0 volt) lines. In addition, blender solenoid drive boards provide DC
power to side 1 and side 2 blend motors.
Located on the solenoid drive board is a fuse labeled F1; this fuse controls all AC voltage
supplied to the solenoid drive board. If the F1 fuse opens the dispenser will reset, but no
valves or relays will be energized.
3.4. COMPUTER ASSEMBLY (see Figure 3-1)
The computer is a complete self-contained unit with a built in power supply and memory
retention device. It is responsible for performing the following functions:
• Provides 5 VDC to, and monitors the return from, the handle switches.
• Monitors the two output lines from each pulser.
• Converts the data received from the pulsers into a volume amount.
• Calculates the sale dollar amount based on the selected unit price.
• Controls the solenoid drive board to switch on the correct submersible pump relays
and solenoid valves. It also switches the pulser select lines to enable the correct
pulser(s) by controlling the solenoid drive board.
• Maintains electronic hose totals.
• Sends sale and hose totals data to the control system via a two wire data loop.
• Monitors all dispenser functions and, when a problem is found, generates and stores
error codes.
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Part No. 917543 Rev. A
Open or off
Closed or on
Open or off
Closed or off
November 1992