MeCAN ™
Mechanical Engine to CAN J1939 interface
Installation Instructions
yi6492 revision A, 2015-06-10 section 80
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 I N G
BEFO RE BEG INNING INSTALLATIO N O F THIS PRO DUCT
D isconnect all electrical power to the m achine
Make sure the machine cannot operate during installation
Follow all safety warnings of the machine m anufacturer
R ead and follow all installation instructions
MeCAN™ is a compact, encapsulated interface module that translates resistive sender, fault switch and speed signals into
SAE J1939 CANbus data. MeCAN allows quick and simple integration of ‘mechanical’, non-ECU engines into modern
CANbus systems. Applications include the retrofit of older engine fleets with modern digital instruments, controls and telemetry, and the development of standard control panels for both ECU and non-ECU engines.
MeCAN has three sensor inputs and one output. Two inputs are for oil pressure and coolant temperature sensing, either by fault switches or resistive senders. The third input measures engine speed, using a magnetic pickup or charge alternator signal. Input signals are translated into SAE J1939 CANbus messages with appropriate PGN address, data scaling and transmission rate. The ‘shutdown’ output operates and latches if the pressure, temperature or speed inputs deviate outside preset fault limits.
A fourth input is connected to a speed calibration potentiometer during setup mode only. DIP switches allow selection of normal/setup mode and two speed input ranges. An LED gives indication of operating mode and CANbus activity.
MeCAN is compact and light enough for inclusion in many wiring harnesses, but can also be surface mounted via four fixing holes. The case is fully sealed in epoxy resin for high impact and environmental resistance.
Two standard versions allow use with either fault switches or
Murphy ES series resistive senders: part numbers model/description
79.70.0096
(previously
79.70.0014)
79.70.0097
(previously
79.70.0020)
MEC301-1 MeCAN I/O module, for use with
Murphy ES pressure & temperature senders
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.
Specifications
Power supply
Operating voltage, steady state: 7 to 35 VDC
Current consumption: 25mA (typ.)
Inputs
Maximum operating range:
–2 to +35 VDC
Oil pressure, coolant temperature:
MEC301-1, 79.70.0096: for resistive senders, Murphy ES series
MEC301-2, 79.70.0097: for switches, closed to negative DC on fault
Speed (magnetic pickup):
opto-isolated, 3
– 30 Vrms, adjustable 10 – 180 pulses per rev
Speed calibration: 0 – 5 kOhm potentiometer (setup only)
Outputs
Shutdown: negative DC (open collector transistor), 250mA max.
CAN: address 0x00, SAE J1939 protocol,
120 Ohm terminating resistor fitted.
Physical
Case material: high impact ABS, epoxy filled
Dimensions: see diagram below
Weight: approx 60g / 0.13 lb
Operating temperature: –20 to +85 °C / –4 to +185 °F
Environmental sealing:
IP65 (with DIP switch protective film intact), exposed lead ends
Electromagnetic compatibility: 2004/108/EC
Connection and Dimensions
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 products and the Murphy logo are registered and/or common law trademarks of Enovation Controls LLC. This document, including textual matter and illustrations, is copyright protected by
Enovation Controls Ltd., with all rights reserved. © 2015 Enovation Controls Ltd. A copy of the warranty may be viewed or printed by going to http://www.fwmurphy.com/warranty.
Electrical Connection & Mounting
Electrical connection
MeCAN connection is via 9 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. MeCAN operates with negative earth/ground or fully insulated DC systems. DO NOT use MeCAN 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. MeCAN includes a non-removable 120 Ohm CAN terminating resistor.
VIOLET: Speed input signal
YELLOW / GREEN: Speed input return
GREY: Speed calibration input (5kOhm potentiometer)
Connect the violet wire to a magnetic pickup or speed 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.
BLACK: Sender/switch common (negative DC)
WHITE: Coolant temp sender/switch input
ORANGE: Oil pressure sender/switch input
Part number 79.70.0096 is designed for use with Murphy
ES series resistive senders: see separate product info for pressure and temperature versus resistance data. For best measurement accuracy, use insulated return (2-wire) senders.
Connect one terminal of each sender to the appropriate
MeCAN input lead; connect the other sender terminals to
MeCAN ’s Sender Common (black) wire. Where 1-wire
(negative DC/ground return) senders are used, connect the black (sender common) wire to battery negative.
79.70.0097 is configured for use with low oil pressure and high coolant temperature switch contacts that close to negative DC on fault. For insulated return (2-wire) switches, connect one switch terminal to the appropriate MeCAN input; the second terminal from each switch (on 2-wire switches) or the body ground (on 1-wire switches) must be connected to MeCAN
’s sender/switch common (black) wire.
BLUE: shutdown output
This open-collector transistor output gives a negative DC signal, rated 250mA max, on detection of fault conditions:
Fault oil pressure coolant temp engine speed
< 10 psi part reference
79.70.0096
(sender inputs)
> 110°C/230°F
> 3500 RPM
79.70.0097
(fault switch inputs) input closed to –DC input closed to
–DC
> 3500 RPM
The output latches following the fault condition, and can be deactivated by removing the DC power supply. The output can be used to drive a warning lamp, audible alarm, suppressed relay coil or ECU shutdown circuit.
Speed input calibration
MeCAN’s speed sensing input must be correctly calibrated before speed data can be correctly transmitted by J1939
CANbus.
WARNING:
speed calibration requires the setting of 2 DIP switches, which are environmentally protected by an adhesive film. To maintain sealing integrity, use a scalpel to carefully lift the film from the DIP switch, make switch adjustments, then replace the film firmly to ensure a good seal.
The speed calibration procedure is as follow: a) Ensure minimum connection (details shown left) of CANbus, speed signal and (isolated) DC power supply wiring. b)
Connect a 5 kOhm potentiometer between MeCAN’s calibration input (grey wire) and battery negative DC. c) Connect (to the CAN network) and power-up a J1939 compatible RPM display, e.g. Murphy PowerView® PV101. d) Set MeCAN switch DP1 to OFF (down) for calibration mode: e) Set switch DP2 for the speed sensor range, if known:
- ON (up) = 10 to 62 pulses per rev
- OFF (down) = 55 to 180 pulses to rev f) Run engine to known speed. g) Power-up MeCAN. The LED flashes rapidly to indicate calibration mode. h) Adjust the 5kOhm calibration potentiometer until the J1939
RPM display indicates the known engine speed. If the indicated speed is too high/low and cannot be adjusted downward/upward, power down MeCAN, switch DP2 to a lower/ higher speed range, then repeat the procedure from g) above. i) Once the correct speed is indicated (and with MeCAN still powered), switch DP1 to ON (up) to save the calibration setting. Normal operation then resumes, indicated by a continuously lit LED (if CANbus traffic is detected) or a slow flashing LED if CANbus traffic is not present). j) Stop the engine and power-down MeCAN. The 5kOhm calibration resistor is not required for normal operation and may be removed. Restart the engine, power-up MeCAN and check for correct operation.
Mounting
MeCAN 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, it can be surface mounted by four M4 (0.15 in) holes
- see diagram on page 1 for approximate dimensions.
MeCAN’s case is sealed to IP65, providing that the DIP switch protective film remains intact. The exposed flying leads must use connectors appropriate for the environmental sealing required.
MeCAN MEC301 installation instructions yi6492 revision A 2015-06-03 p2/3
Operation and Maintenance
Operation
MeCAN begins transmitting J1939 CANbus data immediately after power-up. Data can be viewed using a J1939 compatible display, e.g. the Murphy PV101, or used as part of a J1939 control system, e.g. Murphy CANstart or CASCADE modules.
Engine oil pressure and coolant temperature
Model 79.70.0096 transmits pressure and temperature data when the resistive sender inputs are within normal range.
MeCAN also transmits appropriate J1939 SPN (Suspect
Parameter Number) and FMI (Fault Mode Indicator) codes if:
input resistance is out of normal sender range, e.g. open- or short-circuit
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 79.70.0097 transmits pressure and temperature data in accordance with the input switch position: oil pressure data coolant temp data
Input switch closed (to –DC)
0 psi &
SPN/FMI code
105°C / 221°F &
SPN/FMI code
Input switch open
100 psi
90°C / 194°F
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.
Maintenance and Warranty
MeCAN contains no user-serviceable parts. Maintenance is therefore limited to the following preventative checks:
Check that MeCAN 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.
MeCAN 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.
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MeCAN MEC301 installation instructions yi6492 revision A 2015-06-03 p3/3
