FW Murphy – FuelCAN FLC300 installation instructions 00-02-0663 revision A 26
th
February 2010 p2/2
Operation
At each power up, FuelCAN checks all three inputs for
an in-range sender resistance. If more than one sender is
connected at power-up, FuelCAN prioritises input selection
in the order 1 (Murphy), 2 then 3.
Once FuelCAN has selected a valid input, it continues to
use that input until the DC power supply is cycled. FuelCAN
transmits fuel level data every 2 seconds. Data specification
is otherwise as SAE J1939-71:
PGN 65276 (00FEFC
16
)
Message data length 8 bytes
Relevant byte #2 (fuel level)
Data page 0
PDU format 254
PDU specific 252
Resolution 0.4%/bit gain, 0% offset
Data range 0 to 100%
If a sender failure (short or open circuit) occurs during
operation, FuelCAN transmits fuel level data of value
0xFE
16
(indicating ‘measurement error’).
If no valid sender is detected at power-up, FuelCAN transmits
a value 0xFF
16
(indicating ‘measurement not available’) and
flashes its LED in a ‘heartbeat’ pattern (two short pulses,
followed by a longer pause). J1939 message PGN65275
also includes bytes for other parameters, including washer
fluid level (byte #1), fuel filter differential pressure (byte #3),
engine oil filter differential pressure (byte #4) and cargo
ambient temperature (bytes #5/6). For each of these
parameters, FuelCAN transmits a value 0xFF
16
(indicating
‘measurement not available’).
LED operation is as follows:-
LED pattern
Status
f
f
o
r
e
w
o
P
f
f
O
Flashing
(‘heartbeat’ pulse on)
Power on, but all inputs open circuit
(valid sender not detected).
Flashing
(50/50% on/off)
Power on, valid sender input, but no
CAN activity.
d
n
a
t
u
p
n
i
r
e
d
n
e
s
d
il
a
v
,
n
o
r
e
w
o
P
n
O
CAN activity
Maintenance and Warranty
FuelCAN contains no user-serviceable parts. Maintenance is
therefore limited to the following preventative checks:
•
Check that FuelCAN electrical connections are secure.
•
Check that the case is mounted securely, with vibration
and environmental exposure minimised where possible.
The case may be wiped with a clean, damp cloth. Do not
use cleaning solvents.
FuelCAN is supplied with a two year warranty on parts and
workmanship. In the event of a fault or technical query,
and before returning equipment, please contact your
Murphy representative for technical support.
Electrical Connection & Mounting
Electrical Connection
FuelCAN connection is via 8 colour-coded flying leads
(see diagram on page 1).
RED: Power supply positive DC
BLACK: Power supply negative DC
Connect these wires to a smooth DC power supply in the range
7 to 35 VDC. A 1 Amp anti-surge fuse is recommended in the
positive DC line.
FuelCAN operates with negative earth/ground or fully insulated
DC systems.
DO NOT
use FuelCAN with positive earth/ground
systems.
YELLOW: CANbus high
GREEN: CANbus low
Connect these wires to the engine’s CANbus, using the
appropriate twisted-pair cable to J1939 specification. FuelCAN
includes a non-removable 120 Ohm terminating resistor.
BLACK: Sender common (negative DC)
VIOLET: Sender input 1 (Murphy)
ORANGE: Sender input 2
WHITE: Sender input 3
For best measurement accuracy, use an insulated return
(2-wire) resistive fuel level sender, e.g. (for input 1) Murphy
ES2F series. Connect one sender terminal to the appropriate
FuelCAN input lead (1, 2 or 3); connect the other sender
terminal to FuelCAN’s Sender Common (black) wire.
Where a 1-wire (negative DC/ground return) sender is used,
connect the black (sender common) wire to battery negative.
Mounting
FuelCAN uses an epoxy-resin filled, polycarbonate case for high
impact and environmental resistance. The case is compact
and light enough for inclusion in (or tie-wrapping to) an engine
wiring harness; or, using the actual product as a template,
FuelCAN can be surface mounted via four M4 (0.15 in) holes
(see diagram on page 1 for approximate dimensions). The case
is sealed to IP65; the exposed flying leads must use connectors
appropriate for the environmental sealing required.
Operation and Maintenance
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.
MURPHY, the Murphy logo, are registered and/or common law trademarks of Murphy Industries, LLC. This document, including
textual matter and illustrations, is copyright protected by Frank W Murphy Ltd., with all rights reserved. © 2010 Frank W Murphy Ltd.
