Komatsu PC490-11, Installation And Instruction Manual

Page: 200 / 492

ambient temperature drops further than a temperature where the heating system is capable of maintaining fluidi-
ty of DEF, the DEF system automatically starts purging the remaining DEF back to the tank and stops pumping
and injection while heating continues. Once the ambient temperature rises above a temperature where DEF
system becomes functional, it resumes operation automatically.
Short duration of white plume given off from the tail pipe may be visible at and shortly after engine start-up in
cold weather, but this is not malfunction.
Inducement strategy when the DEF tank Level becomes low
When the amount of DEF in the tank goes low, the Inducement strategy will be activated.
If Inducement starts, add DEF to the DEF tank immediately.
The DEF level caution lamp (1) on the monitor lights up, the audible alert starts, and the Action level is dis-
played, and Inducement strategy is activated. Inducement strategy includes engine output deration, speed limi-
tation, or other warning actions intend to prompt the operator to maintain or repair SCR system.
The Inducement strategy progresses in 4 levels from Warning, Continuous Warning, Low level Inducement and
Severe Inducement.
The DEF level caution lamp (1) on the machine monitor will
light up, audible alert will start, then Action level will be dis-
played on the machine monitor, and engine power will be derat-
ed in steps.
In Action Level “L03 (Low level Inducement)” and “L04 (Severe
Inducement)” engine power will be derated. When Action Level
“03” or “04” is displayed, move the machine to a safe place and
add DEF.
The content of the warning can be checked on the “SCR Infor-
mation” screen of the user menu.
Perform the following procedure.
Press F6 on the standard screen to display the “SCR Informa-
tion” screen of the user menu.
If either the lock lever is set to LOCK position or the travel lever
and control levers are in NEUTRAL position for over 3 sec-
onds, “SCR Information” screen of the user menu will pop up
automatically while the Urea SCR system is in Inducement.
“SCR Information” screen displays the DEF level caution lamp
(1), the DEF level gauge (2), information on the Urea SCR Sys-
tem condition (3), and the current status of Inducement (4).
If Inducement starts, stop the machine in a safe place and add
DEF.
Once the audible alert starts, “The buzzer cancel switch” does
not work unless DEF is added.
EXPLANATION OF COMPONENTS OPERATION
3-128