Perkins 2506 Operation And Maintenance Manual page 29

SEBU8313-02
When the Critical Protection Override is activated,
the ECM will log the condition. The engine will
continue to run the engine in all fault conditions with
the exception of Overspeed shutdown and
Emergency shutdown. If the engine enters a fault
condition the ECM will log the event in memory. The
ECM will record the number of faults that are
overridden. When the Critical Protection Override is
activated, the ECM will energize the Warning, Action
Alert and the Shutdown outputs. as required.
It is not possible to clear logged shutdown events
from the logged events screen which occur when the
ECM is operating in Critical Protection Override
mode.
Note:
If the engine is operated with an active fault and in
Critical Protection Override mode, the engine
warranty will become invalid. When the engine is
operated in Critical Protection Override mode, the oil
pressure and the coolant temperature events will be
displayed in the "critical events" screen of the
electronic service tool.
Standard Warning Outputs
The ECM provides individual outputs in order to drive
warning lamps or relays to indicate each of the
following fault conditions:
• Diagnostic Fault
• Oil Pressure
• Coolant Temperature
• Overspeed
• Action Alert
• Warning
• Shutdown
If the ECM detects a warning for the coolant
temperature , the output on the coolant temperature
will be energized and the warning output will be
energized. If the ECM detects a warning for the low
oil pressure, the output on the oil pressure will be
energized and the warning output will be energized.
If the Action Alert alarms are enabled and the ECM
detects a coolant temperature condition, the output
on the coolant Temperature will be energized and the
output on the Action Alert will be energized.
If the engine shuts down on low oil pressure the
output on the low oil pressure will be energized and
the output on the shutdown will be energized. If the
engine shuts down on coolant temperature or the
engine shuts down on overspeed the dedicated
output and the shutdown output will be energized.
Shutdown Reset
After an engine shutdown, the fault can be cleared by
operating the reset input of the shutdown or powering
down the controller.
Powering down the electronic control module can be
achieved by the operation of the keyswitch into sleep
mode. The electronic control module can be powered
down by isolating the power supply to the electronic
control module.
Note: It is not possible to reset the ECM by using the
Reset input until the engine has come to rest.
Altitude derate
At high altitudes or high ambient temperatures, the
engine will not be derated. The engine derate
information can be obtained from the Applications
Department at Perkins Engines Company Limited
Stafford. These limits for the derate must be
observed or severe engine damage may occur.
Note: There is no provision to manually derate the
engine. When the engine is operating at an high
altitude, the power output requires reducing by the
operator. There is not an adjustment to the engine.
Diagnostic
If there is a fault with the engine protection sensor on
the engine, the engine activates a diagnostic code.
The engine communicates the diagnostic code to the
operator via the Diagnostic output. The diagnostic
code provides an indication to the operator of a fault
with the engine protection system. Running of the
engine for a prolonged period in this condition may
result in engine failure. The output is generally used
to drive lamps or relays.
The following sensors are monitored in order to
determine if the sensors are out of the normal range,
an open circuit or a short circuit:
• Lubricating Oil Pressure
• Inlet Manifold Pressure
• Inlet Manifold Temperature
• Fuel Temperature
• Coolant Temperature
• Engine Speed
29
Operation Section
Monitoring System