Connecting Field Wires To The Mechanical Interface Board - Bennett 3700 Series Installation Manual

Connecting the Field Wires to the
Mechanical Interface Board
Mechanical Mode - Mechanical Mode allows the 3000 series to imitate a mechanical dispenser and
interface to a mechanical pump console or control device. It also allows pulse output communication
with a tank gauge.
A separate mechanical (pulse output) interface board is required for the dispenser. There will be one
Pulse Output board for a single product (single hose or twin) dispenser. The board can output two
channels (Side 1 and Side 2) of pulse information for a console and also for a tank gauge, handle switch
output for pump "in use" signal, and an input for an "authorization" signal for each side of the dispenser
for a product. The mechanical interface board is mounted on the deck inside the electronics enclosure.
This mechanical interface board also communicates with the CPU/s boards.
Pulse Output - The pulse output allows the 3000 mechanical interface to send pulse information
to the console and the Tank Gauge. The system can be programmed to output pulse ratios from 1:1,
10:1, 100:1, and 1000:1. The control system connected to the dispenser must provide 5 - 12 volts DC for
the pulse output channel.
Refer to the Pulse Output Wiring Diagram in the back of this manual and the table on the next page to
see how to wire to the Pulse Output Board. The drawing shows how to wire directly to the pulse output
board OR, if there is an optional junction box installed, the correct wiring to the junction box. Also, the
table lists correct wiring to the Pulse Output Board OR to the optional junction box.
Handle Switch Signal— The handle switch signal can be used to signal the console that the pump is
"in use". Some consoles require this signal and some do not. Refer to the Pulse Output Wiring Diagram
in the back of this manual and the table on the next page to see how to wire the handle switch signals.
Authorization Signal - A console or card/key system can send "authorization" to a fueling point (in the
form of a 110 volt signal) which allows the fueling point to reset at the beginning of the sale. Without this
signal, the dispenser will not reset when in the "Mechanical" mode. Refer to the Pulse Output Wiring
Diagram in the back of this manual and the table on the next page to see how to wire the Authorization
signals.
Tank Gauge Pulse Output Signals - The dispenser electronics Pulse Output Board can send pulse
information to the electronic Tank Gauge system so that it may reconcile dispensed product. The system
can be programmed to output pulse ratios from 1:1, 10:1, 100:1, and 1000:1. The Tank Gauge system
connected to the dispenser must provide 5 - 12 volts DC for the pulse output channel. Refer to the Pulse
Output Wiring Diagram in the back of this manual and the table on the next page to see how to wire the
Tank Gauge signals.
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