FW Murphy – MeCAN MEC300 installation instructions 00-02-0665 28th November 2008 p3/3
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 79.70.0014 transmits pressure and temperature data
when the sender input is within normal resistance range.
MeCAN also transmits appropriate 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 90°C/194°F (warning
message) or 110°C/230°F (shutdown message)
Model 79.70.0020 transmits pressure and temperature data in
accordance with the switch position:
Input switch
closed (to –DC)
Input switch
open
oil pressure data 0 psi &
SPN/FMI code
100 psi
coolant temp data 105°C / 221°F &
SPN/FMI code
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 speed signal is present
(above the minimum 10VAC peak). If engine speed exceeds
3500 RPM, MeCAN also transmits the appropriate 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 flash memory life, hours run data is updated at
3 minute intervals.
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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