Illustration 42 g03679876
Once the amount of soot or sulfur collected has
reached, a critical threshold level the DPF indicator
and red STOP lamp will illuminate solid.
Regenerations may be locked out and require an
authorized Perkins distributor to perform
regeneration with service tool.
i06605661
Selective Catalytic Reduction
Warning System
The selective catalytic reduction (SCR) system is a
system used to reduce NOx emissions from the
engine. Diesel exhaust fluid (DEF) is pumped from
the DEF tank and is sprayed into the exhaust stream.
The DEF reacts with the SCR catalyst to reduce NOx
and leaves a nitrogen and water vapor. The Exhaust
Gas Recirculation (EGR) system cools, measures,
and introduces recalculated exhaust gas into the
intake manifold to aid in NOx reduction.
NOTICE
Stopping the engine immediately after the engine has
been working under load can result in overheating of
SCR components.
Refer to the Operation and Maintenance Manual
,
“Engine Stopping” procedure to allow the engine to
cool and to prevent excessive temperatures in the
turbocharger housing and the DEF injector.
NOTICE
Allow at least 2 minutes after shutting down the en-
gine before you turn the battery disconnect switch to
OFF. Disconnecting the battery power too soon will
prevent purging of the DEF lines after the engine is
shutdown.
Definitions
Observe the following definitions.
Self-correct – Fault condition no longer exists. An
active fault code will no longer be active.
Notification – Action taken by the system to alert the
operator of pending Inducement.
Inducement – Engine derates, vehicle speed limits,
or other actions intended to prompt the operator to
repair or maintain the emission control system.
Inducement Categories – The Inducements are
separated into categories. DEF Level has its own
inducement fault codes and is separate from the
other inducement categories. Whilst DEF level
inducements aresimply based on the DEF level, the
other inducement categories are based on escalating
time. The escalating time inducements will always
have an associated fault code along with the
inducement fault code. The associated fault is the
root cause. The escalating time inducement fault
code is just an indicator of what level of inducement
the engine is in and how much time remains until the
next level of inducement. There are three inducement
categories (two for European Union) that will trigger
an escalating time inducement fault code.
Note: The associated codes for each of the
escalating time categories can be found in the
Troubleshooting Guide under SCR Warning System
Problem.
First occurrence – When an escalating time
inducement fault code becomes active for the first
time.
Repeat occurrence – When any escalating time
inducement fault code becomes active again within
40 hours of the first occurrence. Engine must run for
40 hours without tripping any escalating time
inducement fault before it can get back on first
occurrence times.
Safe Harbor Mode (Worldwide) – Safe Harbor
Mode is a 20 minute engine run time period that the
engine can be operated with full power after reaching
a level 3 inducement. Once in level 3 inducement, the
operator can perform a key cycle and the engine will
enter Safe Harbor Mode. Safe Harbor Mode can only
be implemented once. Safe Harbor Mode is not
allowed for DEF level inducements with Worldwide
configuration.
Safe Harbor Mode (European Union) – Safe
Harbor Mode is a 30 minute engine run time period
that the engine can be operated with full power after
reaching a level 3 inducement. Once in level 3
inducement, the operator can perform a key cycle
and the engine will enter Safe Harbor Mode. Safe
Harbor Mode can only be implemented up to three
times.
SEBU9071-01
53
Operation Section
Selective Catalytic Reduction Warning System
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