Komatsu WA480-8, Operation & Maintenance Manual

Page: 218 / 440

“SCR Information” screen message (5): “3 Engine power is
under deration.”
Due to the reduction of engine power, the machine normal
operation will be limited.
The duration time of “Low level Inducement” is 10 hour.
The remaining time (Minutes) to “Severe Inducement” is
displayed in the column (6) of “SCR Information” screen.
In “Severe Inducement”, engine power will be derated fur-
ther.
Move the machine to the safe place and contact your Ko-
matsu Distributor.
• Severe Inducement:
The audible alert sounds in “Non-stopping alarm”.
The Engine system caution lamp (1) lights up in red.
DEF system caution lamp (2) lights up in red.
Action level “L04” lights up in red at action level display (3).
Press the menu switch to display the “SCR Information”
screen.
“SCR Information” screen message (5): “4 Engine power is
under heavy deration.”
Due to the further deration of engine power, capability the
machine will be limited further.
If the restoration of the EGR valve system abnormality is
not performed, engine performance will kept be derated.
Engine power can be restored temporarily from power derate. This engine power restoration works only
when the Inducement status is “Severe Inducement” and Engine power can be restored temporarily from
power derate. This engine power restoration works only when the Inducement status is “Severe Induce-
ment” and relieves back temporarily to the power deration of “Low level Inducement”. The operator can re-
store engine power through the machine monitor. For the engine power restoration procedure, refer to the
section of “Temporary Restoration from Inducement” in this manual. If Inducement advances to “Severe In-
ducement” and it becomes necessary to restore engine power, use the engine power restoration function to
move the machine to a safe place and contact your Komatsu distributor.
Temporary Restoration from Inducement
Temporary Restoration from Inducement is the one of the Inducement strategies allowed to be included in Urea
SCR systems.
In case the Urea SCR system advances to “Severe Inducement”, engine power is derated heavily. This may
cause difficulties of moving the machine to a safe place for adding DEF or troubleshooting and correcting abnor-
malities of the Urea SCR system. For temporary remedies from these difficulties the operator can restore engine
power for a short time to the deration of “Low level Inducement” through the machine monitor. Note that “Tempo-
rary Restoration from Inducement” does not regain full engine power.
“Temporary Restoration from Inducement” can be activated only when the Urea SCR system is in “Severe In-
ducement”. The maximum duration is limited to 30 minutes in each restoration operation, and only 3 operations
are allowed unless all the abnormalities of the Urea SCR system are corrected.
If the system advances to “Severe Inducement”, utilize “Temporary Restoration from Inducement” immediately.
Procedure to activate “Temporary Restoration from Inducement”.
EXPLANATION OF COMPONENTS OPERATION
3-150