Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 127
10.2.4 Delayed Engine Shutdown (1206F Only)
10.2.4.1 Operation
The delayed engine shutdown software feature is designed to protect the
aftertreatment system from damage during engine hot shutdown events.
Failure to cool the system sufficiently during engine shutdown may result in
operator Inducements on re-start and a reduction in the service life of the
system. The Delayed engine shutdown feature is designed to hold the actual
engine speed at a pre-defined threshold after the ignition key switch has been
turned off. For this reason it is important that the OEM considers the
implications of enabling this feature before deciding to do so. More details
can be found in section 16.3.
Note: In the event of AT system failures due to excessive temperatures
Perkins reserves the right to refuse warranty on the effected parts if the
delayed engine shutdown feature has not been installed.
10.2.4 Intake Air Shutoff Valve
10.2.4.1 Intake Air Shutoff Valve Operation
There are industries where flammable gases could be inhaled by the engine,
potentially resulting in engine speed runaway. The engine software shall
monitor engine speed. If a predefined engine speed is exceeded the engine
software shall invoke the shutoff process, this involves disabling fuelling and
closing an intake shutoff valve (valve installed by the customer). This feature
will aid stopping the engine in a runaway condition.
Some regulatory requirements, in Mining and Petrochemical industries for
example, stipulate the use of an engine intake shutoff. This feature allows the
user to control an air shutoff system, by monitoring engine speed and
activating the air shutoff valve output driver when required.
Once installed using the service tool the engine software monitors the
measured engine speed and compares it to a maximum engine speed limit,
which must also be configured using the service tool. When the engine
exceeds the configured engine overspeed shutdown value, the fuel injection is
disabled and the air shutoff valve activated. Once the shutoff valve is
activated the key switch must be cycled to de-activate the solenoid control.
10.2.4.2 Intake Air Shutoff Valve Configuration
One parameter must be configured using the service tool prior to using the
intake air shutoff solenoid. Within the ‘configuration screen’, air shutoff
defaults to “disabled” and must be set to “enabled”.
Once installed the engine monitoring system parameter for engine overspeed
may be changed to establish the level of protection necessary for the specific
installation. Please refer to section 14 for more information regarding the
configuration of the engine overspeed limit.