MeCAN™ th
00-02-0665
revision C, 26 February 2010
section 78
Mechanical Engine to CAN J1939 interface
Installation Instructions
Please read the following information before installing. A visual inspection of this product for damage during
shipping is recommended before installation. It is your responsibility to ensure that qualified mechanical and electrical
technicians install this product. If in doubt, please contact your local Murphy representative.
General Information
W A R N IN G
BEFORE BEGINNING INSTALLATION OF THIS PRODUCT
Disconnect all electrical power to the machine
Make sure the machine cannot operate during installation
Follow all safety warnings of the machine manufacturer
Read and follow all installation instructions
MeCAN™ is a compact, encapsulated interface module that Specifications
translates resistive sender, fault switch and speed signals into
SAE J1939 CANbus data. MeCAN allows quick and simple Power supply
integration of ‘mechanical’, non-ECU engines into modern Operating voltage, steady state: 7 to 35 VDC
CANbus systems. Applications include the retrofit of older Current consumption: 25mA (typ.)
engine fleets with modern digital instruments, controls and
Inputs
telemetry, and the development of standard control panels Maximum operating range: –2 to +35 VDC
for both ECU and non-ECU engines. Oil pressure, coolant temperature:
MeCAN has three sensor inputs and one output. Two inputs MEC301-1, 79.70.0014: for resistive senders, Murphy ES series
are for oil pressure and coolant temperature sensing, either by MEC301-2, 79.70.0020: for switches, closed to negative DC on fault
fault switches or resistive senders. The third input measures Speed (magnetic pickup):
opto-isolated, 3 – 30 Vrms, adjustable 10 – 180 pulses per rev
engine speed, using a magnetic pickup or charge alternator
Speed calibration: 0 – 5 kOhm potentiometer (setup only)
signal. Input signals are translated into SAE J1939 CANbus
messages with appropriate PGN address, data scaling and Outputs
transmission rate. The ‘shutdown’ output operates and latches Shutdown: negative DC (open collector transistor), 250mA max.
if the pressure, temperature or speed inputs deviate outside CANbus:
preset fault limits. SAE J1939 protocol, 120 Ohm terminating resistor fitted.
A fourth input is connected to a speed calibration potentiometer Physical
during setup mode only. DIP switches allow selection of Case material: high impact ABS, epoxy filled
normal/setup mode and two speed input ranges. An LED Dimensions: see diagram below
gives indication of operating mode and CANbus activity. Weight: approx 60g / 0.13 lb
Operating temperature: –20 to +85 °C / –4 to +185 °F
MeCAN is compact and light enough for inclusion in many Environmental sealing:
wiring harnesses, but can also be surface mounted via four IP65 (with DIP switch protective film intact), exposed lead ends
fixing holes. The case is fully sealed in epoxy resin for high Electromagnetic compatibility: 2004/108/EC
impact and environmental resistance.
Two standard versions allow use with either fault switches or Connection and Dimensions
Murphy ES series resistive senders:
part number model/description
79.70.0014 MEC301-1 MeCAN I/O module, for use with
Murphy ES pressure & temperature senders
79.70.0020 MEC301-2 MeCAN I/O module, for use with
pressure & temperature switches (closing to
negative DC on fault)
Custom solutions are also available for non-standard, volume
OEM requirements.
Electrical Connection & Mounting
Electrical connection Speed input calibration
MeCAN connection is via 9 colour-coded flying leads MeCAN’s speed sensing input must be correctly calibrated
(see diagram on page 1). before speed data can be correctly transmitted by J1939
CANbus.
RED: Power supply positive DC
BLACK: Power supply negative DC WARNING: speed calibration requires the setting
Connect these wires to a smooth DC power supply in the range of 2 DIP switches, which are environmentally
7 to 35 VDC. A 1 Amp anti-surge fuse is recommended in the protected by an adhesive film. To maintain sealing
positive DC line. MeCAN operates with negative earth/ground integrity, use a scalpel to carefully lift the film from
or fully insulated DC systems. DO NOT use MeCAN with the DIP switch, make switch adjustments, then
positive earth/ground systems. replace the film firmly to ensure a good seal.
YELLOW: CANbus high
GREEN: CANbus low The speed calibration procedure is as follow:
Connect these wires to the engine’s CANbus, using the a) Ensure minimum connection (details shown left) of CANbus,
appropriate twisted-pair cable to J1939 specification. MeCAN speed signal and (isolated) DC power supply wiring.
includes a non-removable 120 Ohm CAN terminating resistor. b) Connect a 5 kOhm potentiometer between MeCAN’s
VIOLET: Speed input signal calibration input (grey wire) and battery negative DC.
YELLOW / GREEN: Speed input return c) Connect (to the CAN network) and power-up a J1939
GREY: Speed calibration input (5kOhm potentiometer) compatible RPM display, e.g. Murphy PowerView® PV101.
Connect the violet wire to a magnetic pickup or speed d) Set MeCAN switch DP1 to OFF (down) for calibration mode:
sensor signal output. Connect the yellow/green wire to
the speed signal return wiring (or battery negative on
ground/negative-return systems). This input requires a
speed signal of 3 – 30 VAC rms.
Before calibrating the speed input (see section right),
connect a 5kOhm potentiometer between the grey wire and
battery negative DC. MeCAN allows adjustment for speed
signals between 10 and 180 pulses per engine revolution.
The potentiometer can be removed in normal operation. e) Set switch DP2 for the speed sensor range, if known:
BLACK: Sender/switch common (negative DC) - ON (up) = 10 to 62 pulses per rev
WHITE: Coolant temp sender/switch input - OFF (down) = 55 to 180 pulses to rev
ORANGE: Oil pressure sender/switch input f) Run engine to known speed.
Part number 79.70.0014 is designed for use with Murphy g) Power-up MeCAN. The LED flashes rapidly to indicate
ES series resistive senders: see separate product info for calibration mode.
pressure and temperature versus resistance data. For best h) Adjust the 5kOhm calibration potentiometer until the J1939
measurement accuracy, use insulated return (2-wire) senders. RPM display indicates the known engine speed. If the
Connect one terminal of each sender to the appropriate indicated speed is too high/low and cannot be adjusted
MeCAN input lead; connect the other sender terminals to downward/upward, power down MeCAN, switch DP2 to a
MeCAN’s Sender Common (black) wire. Where 1-wire lower/ higher speed range, then repeat the procedure from
(negative DC/ground return) senders are used, connect g) above.
the black (sender common) wire to battery negative. i) Once the correct speed is indicated (and with MeCAN still
79.70.0020 is configured for use with low oil pressure and high powered), switch DP1 to ON (up) to save the calibration
coolant temperature switch contacts that close to negative DC setting. Normal operation then resumes, indicated by a
on fault. For insulated return (2-wire) switches, connect one continuously lit LED (if CANbus traffic is detected) or a
switch terminal to the appropriate MeCAN input; the second slow flashing LED if CANbus traffic is not present).
terminal from each switch (on 2-wire switches) or the body j) Stop the engine and power-down MeCAN. The 5kOhm
ground (on 1-wire switches) must be connected to MeCAN’s calibration resistor is not required for normal operation and
sender/switch common (black) wire. may be removed. Restart the engine, power-up MeCAN and
BLUE: shutdown output check for correct operation.
This open-collector transistor output gives a negative DC Mounting
signal, rated 250mA max, on detection of fault conditions: MeCAN uses an epoxy-resin filled polycarbonate case for
part reference high impact and environmental resistance. The case is
79.70.0014 79.70.0020 compact and light enough for inclusion in (or tie-wrapping to)
Fault (sender inputs) (fault switch inputs) an engine wiring harness; or, using the actual product as a
oil pressure < 10 psi input closed to –DC template, it can be surface mounted by four M4 (0.15 in) holes
- see diagram on page 1 for approximate dimensions.
coolant temp > 110°C/230°F input closed to –DC
engine speed > 3500 RPM > 3500 RPM MeCAN’s case is sealed to IP65, providing that the DIP switch
protective film remains intact. The exposed flying leads must
The output latches following the fault condition, and can be de- use connectors appropriate for the environmental sealing
activated by removing the DC power supply. The output can be required.
used to drive a warning lamp, audible alarm, suppressed relay
coil or ECU shutdown circuit.
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FW Murphy – MeCAN MEC301 installation instructions 00-02-0665 revision C 26 February 2010 p2/3
Operation and Maintenance
Operation Maintenance and Warranty
MeCAN begins transmitting J1939 CANbus data immediately MeCAN contains no user-serviceable parts. Maintenance is
after power-up. Data can be viewed using a J1939 compatible therefore limited to the following preventative checks:
display, e.g. the Murphy PV101, or used as part of a J1939 • Check that MeCAN electrical connections are secure.
control system, e.g. Murphy CANstart or CASCADE modules.
• Check that the case is mounted securely, with vibration
Engine oil pressure and coolant temperature and environmental exposure minimised where possible.
Model 79.70.0014 transmits pressure and temperature data The case may be wiped with a clean, damp cloth. Do not
when the resistive sender inputs are within normal range. use cleaning solvents.
MeCAN also transmits appropriate J1939 SPN (Suspect MeCAN is supplied with a two year warranty on parts and
Parameter Number) and FMI (Fault Mode Indicator) codes if: workmanship. In the event of a fault or technical query,
• input resistance is out of normal sender range, e.g. open- and before returning equipment, please contact your
or short-circuit Murphy representative for technical support.
• oil pressure drops below 20 psi (warning message) and
10 psi (shutdown/derate message)
• coolant temperature rises above 100°C/212°F (warning
message) or 110°C/230°F (shutdown message)
Model 79.70.0020 transmits pressure and temperature data in
accordance with the input switch position:
Input switch Input switch
closed (to –DC) open
oil pressure data 0 psi & 100 psi
SPN/FMI code
coolant temp data 105°C / 221°F & 90°C / 194°F
SPN/FMI code
Oil pressure fault codes are not transmitted until 10 seconds
after engine starting, once speed has risen above 800 RPM.
Engine speed data
RPM data is transmitted whenever a valid speed signal
is present (above the minimum 3V rms). If engine speed
exceeds 3500 RPM, MeCAN also transmits the appropriate
J1939 overspeed fault SPN and FMI codes.
Battery voltage
MeCAN measures its DC power supply voltage and transmits
this as J1939 ‘electrical potential’ data (PGN 65271).
Hours run
MeCAN transmits ‘engine hours run’ data (PGN 65253).
The hours run value is stored in non-volatile flash memory
and increases only while engine speed is above 500 RPM.
To prolong internal flash memory life, hours run data is
updated at 3 minute intervals.
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.
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FW Murphy – MeCAN MEC301 installation instructions 00-02-0665 revision C 26 February 2010 p3/3
