Sensors And Electrical Components - Perkins 2806C-E18TA Operation And Maintenance Manual

SEBU9074-01
When the Critical Protection Override feature is
active, the ECM will continue to run the engine in all
shutdown conditions except for Overspeed
shutdown. If the shutdown is overridden, an event
code is generated. The ECM will log the event code.
The ECM will energize the following: Warning, Action
Alert, Shutdown, oil pressure, coolant temperature
and overspeed outputs as normal. The warranty of
the engine will be invalidated if the engine is
operated in the following conditions: active event
code and Critical Protection Override mode.
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 coolant temperature warning,
the warning output will be energized. If the ECM
detects a warning for low oil pressure, 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 Action Alert will be energized.
If the engine shuts down on low oil pressure, the
output on the shutdown will be energized. If the
engine shuts down on coolant temperature, or the
engine shuts down on overspeed, the shutdown
output will be energized.
Shutdown Reset
The cause of an engine shutdown must be
investigated. Corrective action must be taken before
the system is reset in order to operate the engine.
After an engine shutdown, operate the reset input of
the ECM or power 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.

Sensors and Electrical Components

Note: The ECM cannot be reset by using the Reset
input until the engine has stopped.
Diagnostic
If there is a fault with an 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 normally 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:
• Atmosphere Pressure
• Lubricating Oil Pressure
• Inlet Manifold Pressure
• Inlet Manifold Temperature
• Fuel Temperature
• Coolant Temperature
• Engine Speed
• Desired Speed Input
The Diagnostic output differs from the Warning and
Shutdown outputs. The Warning and Shutdown
outputs refer to the operation of the engine. The
Diagnostic output refers to the condition of the
electronic system and software system.
A diagnostic fault may develop on the lubricating oil
pressure or coolant temperature sensors. For
example, if a Shutdown protection sensor has a fault,
the result will be an engine shutdown, unless the
system is in critical protection override. If a diagnostic
fault occurs, with one of the engine speed sensors
while the engine is running. The engine continues to
run by using the other timing sensor for reference.
Sensors and Electrical
Components
The illustrations within the following sections are
typical location of the sensors or electrical
components for an industrial engine. Specific
engines may appear different due to differences in
applications.
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Operation Section
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