Perkins SEBU9068-03 Operation And Maintenance Manual page 42

42
Operation Section
Overspeed
" " Derate" "
The orange "Warning" lamp will "flashing" . After the
warning, the engine power will be derated.
The engine will be derated if the engine exceeds
preset operational limits. The engine derate is
achieved by restricting the amount of fuel that is
available for each injection. The amount of this
reduction of fuel is dependent on the severity of the
fault that has caused the engine derate, typically up
to a limit of 50%. This reduction in fuel results in a
predetermined reduction in engine power.
" " Shutdown" "
The orange warning will turn "ON" and the red
shutdown lamp will also turn "ON" . After the warning,
the engine power will be derated. The engine will
continue at the rpm of the set derate until a shutdown
of the engine occurs. The engine can be restarted
after a shutdown for use in an emergency.
A shutdown of the engine may occur in as little as 20
seconds. The engine can be restarted after a
shutdown for use in an emergency. However, the
cause of the initial shutdown may still exist. The
engine may shut down again in as little as 20
seconds.
If there is a signal for high coolant temperature, there
will be a 2 second delay in order to verify the
condition.
If there is a signal for low oil pressure, there will be a
2 second delay in order to verify the condition.
For information on the operation of the warning
lamps and the shutdown lamp, refer to this Operation
and Maintenance Manual, " Monitoring System
(Table for Indicator Lamps)". For each of the
programmed modes, refer to Troubleshooting Guide,
"Indicator Lamps" for more information on Indicator
Lamps.
For more information or assistance for repairs,
consult your Perkins dealer.
Overspeed
• ECM
• RPM
An overspeed is detected by the speed/timing
sensors.
i04348489
Electronic Control Module
Revolutions Per Minute
The default overspeed is set at 2800. The ECM will
cut the power to the electronic unit injectors, until the
rpm drops below the overspeed setting. A diagnostic
fault code will be logged into the ECM memory and a
warning lamp will indicate a diagnostic fault code.
Some application may have a display panel in order
to alert the operator.
SEBU9068-03