Determining The Number Of Wires Needed - Bennett 3000 Series Installation Manual

Determine the Number of Wires Needed
The 531 commercial electronics package in the model 3700 unit is a very simple design. The defueler is
ordered as a one hose unit. A 1 hose unit will have one control board. This control board is where the
field wires will connect if the optional junction box is not ordered. The Installer will run power wires to
side 1 product "A" CPU/Control board. Please refer to the Self-Contained Power Wiring Diagram
located in the Wiring Diagram section of this manual:
Determine the wires needed in each step and add the number of wires from each step together to
determine total number of wires required.
Step 1. Dispenser Power - Every model of 3700 requires these wires:
(1) 12ga. Green ground wire
(1) 14ga Black L1 power wire for electronics power.
(1) 14ga. White for 115V neutral or red for 230V L2, for electronics power.
Step 2. Console Communications -If the dispenser is to be connected to a control console, remote
communication wires will be needed. The 3700 model dispenser uses RS485 communication to the
control console.
To side 1 Product "A" (Control Board): (1) 18ga. wire for RS485 communication positive. (Yellow)
Note - Use twisted wires for the communication wiring at 8 twists per foot. Please refer to the
RS485 Communication Wiring Diagram located in the Wiring Section of this manual.
Step 3. Self-Contained (Suction Pump)- a separate circuit and circuit breaker will be required for the
pumping unit motor. Place the pumping unit motor power circuit breaker on the opposite
phase from the dispenser's electronic power or on 230VAC. This will keep the dispenser's
electronic power free from electronic noise. The dispenser will have one motor . The motor
requires two field wires. Please refer to the Self Contained Power Wiring Diagram located in
the wiring section of this manual.
Needed for each Pumping Unit Motor :
(1) Red for L2 14 ga.* Hot & (1) White 14 ga. Neutral on 115V circuits
OR (1) Red for L2 14 ga.* Hot & (1) Black 14 ga. for L1 Hot for 230V circuits.
* Note: "L2" refers to a different phase leg from dispenser power. Runs longer than 50ft. Will require
larger wires. Size wires to minimize voltage loss or run the motors on 230V circuits to minimize the
current in the wires.
Step 4. Mechanical Pulse Output - If the dispenser is to be wired to a mechanical interface card/key
system, the following wires will be needed: Note - You will need a Bennett Pulse Output Board and
field wiring will be connected between this board and the third party interface system. This board will be
mounted on the deck inside the electronics enclosure. One Pulse Output Board can handle two CPU/
Control Boards per Product. There can be a maximum of two Bennett Pulse Output boards per
dispenser. Please refer to the Pulse Output Wiring Diagram located in the Wiring Section of this manual.
A Pulse Output board for a single product/single Control/CPU board would need to have the following
wires: (2) Pulse output wires per CPU/Control Board (+) and (-) 18 ga. *
(2) Pulse output wires per CPU/Control Board for tank gauge interface (+) and (-) 18 ga. *
(2) Handle circuit wires per CPU/Control Board (+) and (-) 18 ga. *
(1) Authorization wires per CPU/Control Board (120 Volt A.C.) 18ga. *
*Note - The Installer should following the recommended color coding for field wires found in the
Pulse Output Wiring Diagram section of this manual.
Note - The installer will not need RS-485 wires if the Mechanical Pulse Output option is chosen.
108670 Rev A
(115 or 230 Volt installations)
(1) 18ga. wire for RS485 communications negative. (Orange)
(1) 18ga. Wire for RS485 communication common. (Brown)
14
08/04