Bennett CNG Series User manual

125870 Rev A 8-12-14
Bennett CNG Series
CNG Series Remote Dispensers
Electronic Service Manual
Only Trained Personnel May Work on This Equipment
READ THIS BOOK This book has important
information for safely servicing of this equipment.
Read and understand this book before attempting
troubleshooting. Keep this book and tell all service
personnel to read this book. If instructions are not
followed then bodily injury, death or damage to the
equipment may occur.
For new books, FAX to:
BENNETT MARKETING SERVICES
[phone]
Or visit our web page at:
http://www.BennettPump.com
Bennett 1218 E. Pontaluna Road, Spring Lake, MI 49456
USA 800-235-7618 ~ Outside USA 231-798-1310
[e-mail] ~ www.bennettpump.com

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125870 Rev A 8-12-14
Table of Contents
Introduction............................................................................................................................................. 4
Safety Instructions ................................................................................................................................. 5
Overview of 708 Electronic Components ............................................................................................ 6
Basic Electrical Theory of Operation ................................................................................................. 6
Basic Hydraulic Theory of Operation ................................................................................................. 9
Filter Changing Instructions…………………………………………………………………………………
Power Distribution Board ...................................................................................................................... 15
Board Functions................................................................................................................................. 15
Theory of Operation ........................................................................................................................... 16
Battery Backup................................................................................................................................... 17
Description of Power Control ............................................................................................................. 17
Switch 3 ............................................................................................................................................. 17
PAD Jumpers..................................................................................................................................... 18
Fuses ................................................................................................................................................. 18
LEDs .................................................................................................................................................. 18
System Battery................................................................................................................................... 18
Power Cycling .................................................................................................................................... 18
Connectors......................................................................................................................................... 19
Power Supply.......................................................................................................................................... 22
Board Functions................................................................................................................................. 22
Theory of Operation ........................................................................................................................... 22
Fuses ................................................................................................................................................. 22
CPU Board............................................................................................................................................... 25
Board Functions................................................................................................................................. 25
Theory of Operation ........................................................................................................................... 26
Communication with POS.................................................................................................................. 26
Communication with SPM.................................................................................................................. 28
Handle Switch .................................................................................................................................... 28
Meter.................................................................................................................................................. 28
System Software................................................................................................................................ 28
System Memory (RAM) ..................................................................................................................... 28
Ni-CAD Battery .................................................................................................................................. 29
Product Select Pads .......................................................................................................................... 29
Power Fail .......................................................................................................................................... 29
Power On Safe Test........................................................................................................................... 29
LEDs .................................................................................................................................................. 29
Test Points ......................................................................................................................................... 29
RAM Clear ......................................................................................................................................... 31
Connectors......................................................................................................................................... 33
Jumpers ............................................................................................................................................. 34
Valves ...................................................................................................................................................... 35
Calibration............................................................................................................................................... 36
Product Select / Auxiliary Display Board............................................................................................. 38
Theory of Operation ........................................................................................................................... 38
Preparation for Programming ............................................................................................................ 40
Totalizer Assembly............................................................................................................................. 40
Main Display Board ................................................................................................................................ 42
Theory of Operation ........................................................................................................................... 42
LEDs .................................................................................................................................................. 43
Connectors......................................................................................................................................... 43
Auxiliary Display Board ......................................................................................................................... 43
Theory of Operation ........................................................................................................................... 43
Backlight Board ...................................................................................................................................... 45
Theory of Operation ........................................................................................................................... 45
LEDs .................................................................................................................................................. 45

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Table of Contents
Connectors......................................................................................................................................... 45
Intrinsically Safe Barrier Board............................................................................................................. 47
Theory of Operation ........................................................................................................................... 48
Connectors......................................................................................................................................... 48
Fuses.................................................................................................................................................. 48
Handle Switch Board.............................................................................................................................. 49
Theory of Operation ........................................................................................................................... 49
Test Point ........................................................................................................................................... 50
Connector........................................................................................................................................... 50
LEDs................................................................................................................................................... 50
Communication Hub Board ................................................................................................................... 52
Theory of Operation ........................................................................................................................... 52
Dispenser Peripherals Interface......................................................................................................... 53
Connectors......................................................................................................................................... 53
LEDs................................................................................................................................................... 55
Jumper ............................................................................................................................................... 55
Software ............................................................................................................................................. 55
Purging System ...................................................................................................................................... 57
Dispenser Error Codes .......................................................................................................................... 59
Clearing Error Messages ................................................................................................................... 59
Diagnostics ............................................................................................................................................. 62
Menu Code 0...................................................................................................................................... 63
Menu Code 1...................................................................................................................................... 64
Menu Code 2...................................................................................................................................... 64
Menu Code 3...................................................................................................................................... 65
Menu Code 4...................................................................................................................................... 65
Menu Code 5...................................................................................................................................... 66
Menu Code 6...................................................................................................................................... 67
Menu Code 7...................................................................................................................................... 69
Menu Code 8...................................................................................................................................... 69
Menu Code 9………………………………………………………………………………………………….70
Maintenance ............................................................................................................................................ 73
Literature ................................................................................................................................................. 74

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125870 Rev A 8-12-14
This manual covers service information for the electronic components of Bennett pumps. It covers the
LNG Series with 708 electronics. Information is correct at time of publication. For more information,
please contact the Bennett Customer Response Department at Bennett Pump in Spring Lake, Michigan.
UNAUTHORIZED ALTERATION OF BENNETT PRODUCTS
Bennett Pump Company products are designed to meet or exceed the standards of UL, FCC and the
National Institute of Standards and Technology. These standards protect the operator and the
consumer from personal injury and ensure an accurate delivery of product. Any deviation from the use
of authorized replacement parts or alteration of a designed product configuration may cause personal
injury, death or the revocation of one or all of the above approvals.
The most frequently abused design alteration of Bennett products is the conversion of a self-contained
model (pumping unit in the dispenser cabinet) to a remote dispenser (submerged pump in the storage
tank). This field practice has mainly occurred in an effort to overcome the problem of vapor lock.
Bennett Pump Company does not condone nor offer a kit or instructions for this type of conversion.
Bennett Pump Company strongly opposes this type of conversion. Safety standards required by the
agencies above are violated when unauthorized conversions are performed.
Bennett Pump Company will not assume responsibility or liability for any consequential injury or damage
caused by the unauthorized alteration of its products.
NOTE: Before performing any type of service to the dispensers, be sure to shut off all
electrical supplies and secure them in the OFF position. Close all valves in incoming
piping. Maintenance must be performed by trained personnel ONLY.
BEFORE SERVICING A BENNETT DISPENSER, CHECK THE FOLLOWING:
1. Make sure all dispensers are correctly grounded with 12 gauge wire.
2. Make sure input voltages are within operating level: 120VAC (96 to 135VAC).
3. There are no more than two units operating on a clean and dedicated 120VAC voltage
source.
IF ANY DEVIATION FROM THE ABOVE IS FOUND,
CORRECT THE PROBLEM BEFORE PROCEEDING.
Introduction
FOR CNG INSTALLATIONS:
Note: It is REQUIRED that a pressure regulator is installed at the dispenser if there is no other
device to limit pressure at the dispenser.
Note: Pressure at the dispenser must not exceed 4250PSI.

125870 Rev A 8-12-14
5
NOTICE:
This device complies with part 15 of the FCC rules. Operation is subject to the following 2 conditions:
(1) This device may not cause harmful interference and (2) this device must accept interference received,
including interference that may cause undesired operation.
Safety Instructions
READ AND UNDERSTAND ALL WARNING LABELS ATTACHED TO THE DISPENSE
DANGER: Fire, explosion, injury or
death will occur if filters are changed by
untrained personnel. Make sure only trained
personnel change filters.
WARNING: When anchoring the
dispenser, always level the dispenser with shims
before bolting to the island. DO NOT shim just
the middle of the dispenser and bolt down.
WARNING: Make sure this equipment is
correctly grounded. Failure to do will cause
injury or damage equipment or improper
operation. Improper grounding voids the
warranty.
WARNING: Training is needed in the
operation and programming of this dispenser
before using it. READ THE OPERATORS
MANUAL.
WARNING: The shut-off ball valve for the
incoming CNG Line must be closed when
service or maintenance is performed on this
equipment.
WARNING: Electronic components are
static sensitive. Use proper static precautions
(static straps) before working on the equipment.
WARNING: To prevent electric shock,
keep the electrical parts of the dispenser dry.
WARNING: Training is needed in the
installation, service or maintenance of this
equipment (dispenser, pump, console, control
box) before working on it. Maintenance repairs
must be done by authorized personnel only.
DANGER: Disconnect all power and
relieve pressure to this equipment and
associated pump during installation, service or
any maintenance, i.e., changing filters.
DANGER: CNG is flammable.
NO SMOKING OR OPEN FLAME.
DANGER: To prevent injury from
vehicles and onlookers, always place a barrier
around this equipment before performing service
or maintenance.
WARNING ADVERTISSEMENT ADVERTENCIA
For the safe installation of this equipment, read and understand all warning and cautions. Look for these
warnings:
“DANGER” means: If instructions are not followed, severe injury or death will occur.
“WARNING” means: If instructions are not followed, severe injury or death can occur.
“CAUTION” means: If instructions are not followed, damage can occur to the equipment.
WARNING: Vehicle engine must be turned
off while dispensing product.
WARNING: No ignition source can be
within 10 feet of the dispenser.
WARNING: A portable fire extinguisher with
a rating of no less than 20-B:C must be provided
in the dispensing area.
WARNING: If the breakaway is not
provided then one must be installed that will
disengage at 150lbs.
WARNING: There must be a message near
the dispensers that says, “Natural Gas Vehicle
Fuel Cylinders shall be periodically inspected
(normally every 3 years) to ensure safe
operation of the vehicle. Contact vehicle or
cylinder manufacture.”
CAUTION: Do not drill holes in
dispensers. Holes can cause failure of the
electronic equipment. The warranty will become
void. Use only adhesive backed sign mounting

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125870 Rev A 8-12-14
Basic Electrical Theory of Operation:
110VAC 60 cycle power comes into the dispenser through the field wiring conduit, into the Junction Box
and to the bottom of the Power Distribution Board terminal strip (TS1). Power then passes through a 3
amp fuse and then is filtered for noise. Any electrical noise is dampened out by this filter FIL1. The
power is then passed from the Power Distribution Board to the Power Supply (through connector J5) for
Direct Current (DC) conversion. There is only one Power Distribution Board and one Power Supply for
the dispenser.
Power Supply - Power comes into the Power Supply assembly on connector J1. This power
supply creates various DC Voltages for use throughout the system. Specifically, the power supply takes
the 110VAC input to create the following voltages:
1) 24 VDC (+/- 5%)
2) 12 VDC (+/- 5%)
3) 5 VDC (+/- 5%)
The DC voltages are fed back to the Power Distribution Board connector J4 through a multi-pin
conductor connected to J2 of the Power Supply. There is fuse protection on the Power Distribution
Board for both power coming into the system and also fuse protection for power traveling internally to
the system. From there the DC voltages are sent over to the CPU Board through another multi-pin
conductor from connector J1 of the Power Distribution Board to connector J7 on the CPU Board. From
this point the voltages are distributed to all other parts of the system.
Battery Backup - A separate rechargeable 12 volt battery is connected to the Power Distribution
Board. When the dispenser is in normal operation the battery is not used and is charged by the 14 VDC
battery charging circuit located on the Power Distribution Board. When main incoming power is removed
from the system or when the system incoming AC voltage drops below 74 VAC, the CPU Board detects
this and the dispenser goes into “Power Fail” condition. At this point the battery supplies 12 VDC for 30
seconds to the system, or unless the momentary “battery kill” switch is used. This battery kill switch
allows the technician to eliminate the 30 second wait if he has to service the equipment. The battery
itself is connected at the factory but requires several hours to charge. This battery has nothing to do with
maintaining system programming in the event of a power outage.
Power Distribution Board - The Power Distribution Board has other functions as well. Current
Loop communication with a Point of Sale and Card Reader communication is routed through the Power
Distribution Board. Dispenser communication comes in from the model 515 box to the Power
Distribution Board terminal strip TS5. This is the current loop communication signal that passes through
the Power Distribution Board on connector J3 through a ribbon cable to the CPU Board connector J8.
Card reader communication is also routed through the Power Distribution Board. Card reader
information comes from the IC Box through twisted pair wiring (3 wires) and connects to terminal strip
TS4 (Card readers communicate via RS485 Protocol). This information follows the same path through
the Power Distribution Board as the dispenser communication, that is, it exits the Power Distribution
Board through the same ribbon cable over to the CPU Board on connector J8.
Note: There is a timer board inside the Junction Box that will prevent power from reaching the
upper cabinet if pressure is below .15 inches water column. If pressure raises above .15 inches
water column for over 3 minutes and 30 seconds power will be restored to the upper cabinet
(power distribution board).
Overview of 708 Electronic Components

125870 Rev A 8-12-14
7
The CPU Board - The CPU Board is the heart of the system. It runs the software, has the memory,
communicates with Point of Sale, sends display signals to the display boards, communicates with the
product select touch panel, interfaces with the handles, controls the control valves through a wiring
harness. It stores historical data for sales and diagnostics. It receives power from the Power Distribution
Board. It also routes power to the card reader system. The RS485 fuel communication (if used) routes
directly to the CPU Board.
There is one CPU Board per dispenser and it can be accessed easily by opening the electronics
enclosure door. The CPU Board is mounted vertically and has various cables and harnesses connected
to it.
The CPU Board receives DC Voltages from the Power Distribution Board on connector J7. The wiring
harness is color coded and uses the following color scheme:
1) Orange - 24 VDC Valve, Printer, Coriolis Meter, Gas Detector, display and Backlighting
2) Yellow - 14 VDC Battery charging circuit
3) Red - 12 VDC Product Select, Card Reader, and Handles
4) Black - DC Ground Reference for all DC voltages
5) Violet - 5 VDC System logic voltage used by the CPU Board
The CPU Board is physically mounted to the Intrinsically safe barrier modules.
Intrinsically Safe Barrier Board - The Intrinsically safe Barrier Board provides protection to the handle
circuit located in the lower half of the dispenser in the hydraulic area. These circuits are designed with
fuses and zener diodes to prevent any potential energy from entering the hydraulic area so that under
no condition will there be enough energy to create an electrical “spark”. This way, there can be no
explosion if there are vapors. The fuses on this board cannot be replaced in the field as a UL
requirement. This board is covered with a metal cover to protect the circuits from an inadvertent short
and the covers should always be in place when the dispenser is in operation. The board does not have
any discrete or “smart” components.
Nozzle Boot - The handle switch allows the system to know that the handle is lifted and signals the
CPU Board to begin a transaction. The handle switch uses a magnetic proximity switch to signal when
the nozzle has been removed from the boot. On the nozzle boot there is a spring loaded flapper.
Attached to the flapper is a magnet. When the nozzle is removed from the nozzle boot and the flapper
lowers it moves the magnet away from the proximity switch on the handle circuit board. When this
happens, the switch is opened and sends a signal to the CPU Board. When the nozzle is returned to
the nozzle boot this signals the sale is complete and the CPU Board sends this information to the Point
of Sale device (if there is one).
Solenoid Valves - The CPU Board also controls the solenoid valves. The valves are there to control
the flow of CNG through the dispenser’s hydraulics. These valves operate on 24 VDC. The CPU Board
sends the voltage to the valves. When the valves are energized the open to allow CNG to pass through
the meter and eventually out through the nozzle.
System Memory - A 3.3 VDC battery is provided on the CPU Board. It is used for maintaining system
programming in the Random Access Memory (RAM) during a power outage, or anytime the system is
turned off. This battery is not field replaceable.
System software - The dispenser “operating program” is provided by use of two 32 pin EPROMS.
These EPROMS determine the functions that are available on the dispenser.
Overview of 708 Electronic Components

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125870 Rev A 8-12-14
Main Display Board - The Main Display Board is used for the customer to view the currency and mass
amount of the sale. The display gets its information from the CPU Board through the Product Select
Board.
Electromechanical Totalizer Board - The dispenser is equipped with an Electro -mechanical
totalizer for each hose which records the mass dispensed for each sale. The mass recorded is an
accumulative total that cannot be reset. The total is cumulative and reads in whole mass increments.
Main Display Backlighting Board - The dispenser does not use standard lights or ballasts. To light the
display, it uses a Backlight Board using a series of 1.5 volt Light Emitting Diodes (LEDs). By using this
type of lighting it eliminates the need to replace burnt out light bulbs and ballasts. The LEDs are
powered from 24 Volts DC received from the Main Display Board.
Communication Hub Board - The dispenser has one Communication Hub Board installed Per
Side. The board mounted on the Circuit Board Cage (where the other circuit boards are mounted) is
used to control the Instruction Prompts on the SPM or Card Reader Display. This is also the board that
communicates with the intelligent meter. It also monitors product pressure and ambient temperature in
and around the cabinet.
Purging Components - For the Electronics Head to be used in a Class 1, Division 2, Group D area
there must be a continual pressure differential. The minimum pressure differential must be 0.15 inches
of water column at all times. This is controlled by a blower attached to the electronics' enclosure and the
Purging Components. These components measure the amount of pressure differential at all times. If
this drops below the minimum amount then power will be removed from the dispenser.
Normal fueling transaction at the dispenser - Once the nozzle is connected to the vehicle the
customer lifts the nozzle boot handle to begin the transaction. If the fueling point is authorized the
display will reset and will perform a segment check. The dispenser will automatically cycle through all
available valve banks to fill the vehicle’s tank. Once the tank is full the dispenser will indicate that the fill
process is complete. At this point the customer may disconnect and hang up the nozzle to end the
transaction.
Overview of 708 Electronic Components

125870 Rev A 8-12-14
9
Basic Hydraulic Theory of Operation:
Refer to figure 1.1 (next page) and figure 1.2 (page 11) for flow direction and component placement.
Prior to this procedure the customer will have already attached the nozzle onto the vehicle tank. Once
that is completed and the customer starts the dispenser the following procedure occurs in the Hydraulics
portion of the dispenser:
CNG enters the dispenser inlet traveling up through the shut off valve and up to the solenoid valve. The
solenoid valve controls the flow of CNG through the meter and out through the nozzle into the tank.
Once the dispenser is authorized and resets the solenoid valve opens, allowing the flow of CNG. The
meter measures the mass of CNG that flows through it on its’ way out through the nozzle and into the
tank. While the tank is filling the display on the SPM should show a tank with a portion that is blue. Once
the tank shows that it is entirely green on the display the tank on the vehicle should be full and the sale
will end. The end of the sale is determined by the flow rate near the end of the sale. As long as the flow
rate is above what was programmed as the end flow rate in mode 10 the dispenser will continue to fill.
Once all tanks are full the customer will hang up the nozzle, ending the transaction.
Overview of Hydraulic Components
Side two of dispenser
Side one of dispenser
Needle Valve
Solenoid
Valve
Shut Off
Valve
Mass Flow
Meter
Filter

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125870 Rev A 8-12-14
Overview of Hydraulic Components 3 Bank
Figure 1.1 - Hydraulics Schematic
Bank 3 Shut Off Valve
Bank 2 Shut Off Valve
Bank 1 Shut Off Valve Solenoid Valve
Solenoid Valve
Solenoid Valve
Solenoid Valve
Solenoid Valve
Solenoid Valve
Mass Flow Meter
Mass Flow Meter
Breakaway
Breakaway
Breakaway
Breakaway
Check Valve
Check Valve
Check Valve
Check Valve
Needle Valve
Pressure Transmitter
Pressure Transmitter
Pressure Gauge
Pressure Gauge
Gas
Detector
Grade Select
Nozzle Lever
Thermocouple
Pressure Switch

125870 Rev A 8-12-14
11
Overview of Hydraulic Components Single Bank
Figure 1.1 - Hydraulics Schematic

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125870 Rev A 8-12-14
Overview of Hydraulic Components
Refer to figure 1.1 (Previous Page) and figure 1.2 for flow direction and component placement.
Shut off Valve (A)- There is one shut off valve for each CNG bank located at the inlet of the dis-
penser. The shut off valve is used to remove or restore the flow of CNG into the dispenser for mainte-
nance.
Solenoid Valve (B)- This component is used to control the flow of CNG to start and end each
sale. The CPU controls each solenoid valve.
Mass Flow Meter (C)- There is one part to the Coriolis Meter. The Coriolis meter is located in the
hydraulic section of the dispenser. This is the section that holds the product and it contains the parts
used to measure the product flow. The CNG Coriolis Meter is one package that contains the flow sensor
and the core.
Pressure Transmitter (D) - The Pressure Transmitter is used to measure the pressure in the
product line. The pressure sensor is located after the meter.
Thermocouple - This component is used to measure the air temperature in and around the cabi-
net. The Thermocouple is located in the electronics cabinet of the dispenser.
Check Valves (E)- There are two Check Valves per side on a CNG Dispenser. One Check Valve
is located right after the vent hose. This check valve is used to restrict CNG from entering the vehicle
tank via the vent hose. The other Check Valve is located between the fill and vent line (Before the nee-
dle valve) to keep CNG from entering the fill line from the vent line.
Needle Valve (G)- This component is used to relieve pressure from the system for maintenance.

125870 Rev A 8-12-14
13
Changing A CNG Filter
CNG Filter Change:
1. Turn off all CNG inlet ball valves to shut off the flow of CNG into the dispenser.
2. Slowly open the needle valve to relieve pressure in the hydraulics.
3. Plug in the manager’s keypad and open the valves in mode 80.
(4-Activates all valves side 1)
(8-Activates all valves side 2).
4. Once the pressure is relieved the gauges should read “0 PSI” on the dispenser.
5. Close the needle valve
6. Slowly vent the drain on the filter housing, if there is pressure close the drain and
repeat steps 2 through 6.
7. After the filter is vented and pressure is relieved the filter may be replaced.
NOTE: Hydraulics are under high pressure do not drain the filter housing with-
out first relieving pressure from the system. Make sure the vent on the bleed
valve is aimed away from yourself as well as onsite personal.

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125870 Rev A 8-12-14
Notes

125870 Rev A 8-12-14
15
Power Distribution Board Assembly - 116449
Board Functions:
 Incoming A.C. Voltage (TS1)
 Incoming A.C. Voltage filter (FIL1).
 Fuse protection for the system (F1, F2, F3, F4 -7)
 D.C. voltage distribution (J1)
 Battery charging circuit (J2)
 Field Wiring connection for card reader, and Current Loop Communication. (TS 4 & 5)
 Provides a switch for the main power (S2)
 Provides a switch for the battery override (S3)
Power Distribution Board
Figure 2.1

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125870 Rev A 8-12-14
Power Distribution Board Theory of Operation -
The Power Distribution Board is located in the center of the
dispenser in the electronics cabinet. This board is covered by a
metal cover to protect anyone working inside the equipment from
receiving an electrical shock. This cover is removed for service. It
must also be replaced when service is complete (see figure 2.2).
WARNING: Always replace the metal cover when
service is completed. Failure to do so poses a potential
for electrical shock.
110VAC 60 cycle power comes into the dispenser through field
wiring to the bottom of the Power Distribution Board terminal strip
TS1 (see figure 2.3). Power then passes through a 3 amp fuse
and then is filtered for noise. Any electrical noise is dampened
out by this filter (FIL1). The power is then passed from the Power
Distribution Board to the Power Supply (through connector J5) for
Direct Current (D.C.) conversion.
Incoming A.C. voltage is also routed through fuse F1 (1 amp). If
this fuse blows troubleshoot incoming power prior to replacing the
fuse.
Power from the Power Distribution Board comes into the Power
Supply assembly on connector J1. This power supply creates
various DC Voltages for use throughout the system. Specifically,
the power supply takes the 110VAC input to create the following
voltages:
1) 24 VDC
2) 12 VDC
3) 5 VDC
These voltages have tolerances of +/- 5%. There are no
adjustments for any of these voltages, but there are test points.
The DC voltages are fed back to the Power Distribution Board
connector J4 through a multi-pin conductor connected to J2 of the
Power Supply (see figure 2.4).
There is fuse protection on the Power Distribution Board for both
power coming into the system and for power traveling internal to
the system. From there the DC voltages are sent over to the CPU
Board through another multi-pin conductor from connector J1 of
the Power Distribution Board to connector J7 on the CPU Board
(see figure 2.5). From this point the voltages are distributed to all
other parts of the system.
Figure 2.2 - Power Distribution Board with the
protective cover on.
Figure 2.3 - Incoming power on terminal TS1
is line voltage. It passes through fuse
protection and a easy “Off/On” switch. Then it
is filtered and sent over to the power supply.
Figure 2.4 - DC voltages returns from the
power supply to the Power Distribution Board
on connector J4.
Power Distribution Board
Figure 2.5 - Pico fuses and standard
replaceable fuses are located in the upper
right of the Power Distribution Board .

125870 Rev A 8-12-14
17
Battery Backup - A separate rechargeable 12 volt battery (see
figure 2.6) is connected to the Power Distribution Board. When
the dispenser is in normal operation the battery is not used. It is
charged by the 14 VDC battery charging circuit located on the
Power Distribution Board. When main incoming power is removed
from the system or when the system incoming AC voltage drops
below 74 volts AC, the CPU Board detects this and the dispenser
goes into a “Power Fail” condition. At this point the battery
supplies 12 VDC for 30 seconds to the system, or unless the
battery override switch is closed. This battery over-ride switch
allows the technician to eliminate the 30 second wait if he has to
service the equipment. The battery itself requires 24 hours to
charge. This battery has nothing to do with maintaining system
programming in the event of a power outage. Make sure the
battery is connected because the battery will eliminate the effect
of momentary power sags thus making the dispenser more
reliable.
Dispenser communication (Current Loop) and Card Reader
communication is also routed through the Power Distribution
Board. Dispenser communication comes in from the model 515
box to the Power Distribution Board terminal strip TS5 (see figure
2.7). This is the current loop communication signal that passes
through the Power Distribution Board on connector J3 through a
ribbon cable to the CPU Board connector J8.
Card reader communication is also routed through the Power
Distribution Board. Card reader information comes from the IC
Box through twisted pair wiring (3 wires) and connects to terminal
strip TS4 (see figure 2.7). This is RS485 card reader protocol.
This information follows the same path through the Power
Distribution Board as the dispenser fuel communication, meaning
it exits the Power Distribution Board through the same ribbon
cable to the CPU Board connector J8.
Description of Power Control -
The only option for removing power from the dispenser is by
turning off the S2 switch from the Power Distribution Board.
Switch 3 (S3) - On the bottom right hand side of the board is
the Battery Over-ride Switch (see figure 2.8). This switch can be
used to override the 30 second battery if primary power is lost at
the dispenser, or if incoming power drops below 74 volts A.C.
This switch Stays in the up position by a spring. To “kill” the
power press down momentarily and release. Once the switch is
closed, and the display goes blank, release the switch.
Figure 2.6 - External battery for maintaining
display after loss of primary power. This battery
is re-chargeable and takes several hours to
charge on a brand new dispenser.
Power Distribution Board
Figure 2.7 - TS4 is the Dispenser Card
Terminal Connection to the IC Box in the
building and TS5 is the Fuel Communication
to the 515 box.
Figure 2.8 - S3 is a switch which is normally
opened. Always turn off the battery when
attempting to service the LNG dispenser.

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125870 Rev A 8-12-14
PAD Jumpers - There are a series of PAD jumpers located
below the solid state relays (see figure 2.9). These PAD jumpers
should not change in the CNG dispenser.
Fuses - A series of fuses are located on the Power Distribution
Board. There are two types, standard and Pico. The standard
fuses are located in standard fuse mounts whereas the Pico
fuses are soldered onto the board. The fuses are used as follows:
Standard Fuses
F1 - 1 amp standard blow for submerged pump control
F2 - 3 amp standard blow for system power
F3 - 1 amp for battery charging circuit.
Pico Fuses -
F4 - F5 - (3.25 amp) 24 VDC circuit side 1 and side 2
F6 - (3.25 amp) 14 VDC battery charging circuit
F7 - (3.25 amp) 12 VDC circuit side 1 and side 2
F8 - (3.25 amp) 5 VDC logic power
NOTE - Contact Technical Support before replacing a Pico fuse.
Light Emitting Diodes - There are several LEDs located on this board. They are described as follows:
D 7 - Recall. If illuminated means that the Recall button has been activated.
D14 - Power Fail. If illuminated means that the system has lost primary power or that incoming
power has dropped below 75 VAC.
System Battery (P/N 105908) - A 12 volt rechargeable battery is supplied with the dispenser. The
battery has a charging circuit and must be charged for several hours before it has a full charge. The
battery is used to supply DC voltage (12 VDC) to the dispenser if the dispenser loses primary power or if
primary power drops below 75 VDC. The battery, when in use, provides power for 30 seconds and then
times out. The battery override switch is located on the right hand side of the Power Distribution Board.
It is used to bypass the 30 second battery “On” time. To override the battery in the system, push down
on switch F1. It will disconnect the battery circuit.
WARNING: Always make sure the battery has been bypassed when servicing the equipment.
Powering down the dispenser for Service - To remove power from the dispenser for service follow
this procedure - Power down the dispenser by turning off S2 from the Power Distribution Board. The
display lights should go off and a message on the display should read “PFAIL”. This message will blink
for 30 seconds OR until the battery override switch is closed (S3 on the Power Distribution Board).
Turning the dispenser back on - Turn on S2 from the Power Distribution Board.
WARNING: Always replace the metal cover for the Power Distribution Board after service
work is complete. This will help protect any un-trained store personnel from voltages if they
open the electronic head of the dispenser.
Figure 2.9 - PAD jumpers
Power Distribution Board

125870 Rev A 8-12-14
19
Terminal Strips, Connectors and Pin-outs - The following is a description of the connections to the
terminal strips, and pin-outs of all the connections on the Power Distribution Board.
Note: Voltage readings can be taken right on the terminal strip connector pins.
Terminal Strip 1 (TS1) - Dispenser Input Power
 Pin 1 - Earth Ground
 Pin 2 - Neutral
 Pin 3 - Incoming Line Voltage (L1 @ 50 or 60 Hz)
Terminal Strip 2 (TS2)
 Not Used
Terminal Strip 3 (TS3)
 Not Used
Terminal Strip 4 (TS4) - Card Reader (SPM) Communication (RS485)
 Pin 20 - (+) Data
 Pin 21 - Common Data
 Pin 22 - (-) Data
Terminal Strip 5 (TS5) - Dispenser Communication (Current Loop)
 Pin 23 - (-) Data for Side 1
 Pin 24 - (+) Data for Side 1
 Pin 25 - (-) Data for Side 2
 Pin 26 - (+) Data for Side 2
Terminal Strip 6 (TS6) - Constant 120 AC Connection—Note that this is a constant 120vac.
 Pin 1 - Neutral (or L2)
 Pin 2 - Incoming Line Voltage (L1 @ 60 Hz)
J1 - DC voltages from the Power Distribution Board to the CPU Board - Multi colored cable
 Pin 1 - (24 VDC) Backlights, Printer and Valve Control side 1 (Orange)
 Pin 2 - (24 VDC) Backlights, Printer and Valve Control side 2 (Orange)
 Pin 3 - Standby (14.5 VDC battery backup) side 1 (Yellow)
 Pin 4 - Standby (14.5 VDC battery backup) side 2 (Yellow)
 Pin 5 - (12 VDC) Display Board, operator interface board side 1 (Red)
 Pin 6 - (12 VDC) Display Board, operator interface board side 2(Red)
 Pin 7 - (DCC) - Direct Current Common or Ground Reference (Black)
 Pin 8 - (DCC) - Direct Current Common or Ground Reference (Black)
 Pin 9 - (DCC) - Direct Current Common or Ground Reference (Black)
 Pin 11 - (5 VDC) CPU logic power Side 1 (Violet)
 Pin 12 - (5 VDC) CPU logic power Side 2 (Violet)
J2 - Battery Charging Circuit - When main power is on the battery charging circuit provides 14.1
Volts DC to charge the battery. When the battery is “On” the battery supplies 12.6 volts DC for the sys-
tem.
 Pin 1 - 14.1 VDC battery charging. 12.6 VDC battery on.
 Pin 2 - Direct Current Common (DCC)
 Pin 3 - Not Used
Power Distribution Board

20
125870 Rev A 8-12-14
J3 - Grey ribbon cable that connects the CPU Board to the Power Distribution Board. This cable handles
the card reader communication and dispenser communication (Current Loop) from the CPU Board to the
Power Distribution Board. It also turns off the battery back-up after 30 seconds, is responsible for P-Fail
and Recall. These pins cannot be measured in the field.
J4 - D.C. Voltages created by the Power Supply and sent to the Power Distribution Board
 Pin 1 - 5 VDC Logic Power for the CPU (Violet)
 Pin 2 - 5 VDC Logic Power for the CPU (Violet)
 Pins 3-6 - Direct Current Common (DCC) Ground Reference (Black)
 Pin 7 - 12 VDC Power for display board, operator interface board, local preset side 1 (Red)
 Pin 8 - 12 VDC Power for display board, operator interface board, local preset side 2 (Red)
 Pin 9 - 24 VDC Used for Backlights, Printer and Valve Control side 1 (Orange)
 Pin 10 - 24 VDC Used for Backlights, Printer and Valve Control side 2 (Orange)
J5 - Filtered A.C. 110 volts A.C. 60 cycle from Power Distribution Board from Power distribution
to the Power Supply
 Pin 1 - Earth Ground (Green)
 Pin 3 - Neutral (White)
 Pin 5 - 110VAC 60 cycle (Black)
J6 - Non-filtered A.C. 110 volts A.C. 60 cycle. Note that this is switched.
 Pin 1 - Earth Ground
 Pin 2 - Neutral (L2)
 Pin 3 - Incoming Line Voltage 60 Hz
Power Distribution Board