Komatsu HD325-8, Operation & Maintenance Manual

Page: 206 / 464

• Severe Inducement:
The audible alert sounds in “Continuous alarm”.
No gradation of the DEF level gauge lights up.
The DEF level caution lamp (1) lights up in red.
The action level “L04” is displayed in red (5).
Press the menu switch to display the “SCR Information”
screen.
When all gradations of the DEF level gauge go off. DEF re-
filling amount is approximately 22 ℓ to fill up the DEF tank.
“SCR Information” screen message (4): 4 “Engine power is
under heavy deration.”
Engine power can be restored temporarily from power derate. This engine power restoration works only
when the Inducement status is “Severe Inducement”and relieves back temporarily to the power deration of
the “Low level Inducement”. The operator can restore engine power through the machine monitor. For the
engine power restoration procedure, refer to the section of “Temporary Restoration from Inducement” in this
manual. Once in “Severe Inducement” and it becomes necessary to restore engine power, use the engine
power restoration function to move the machine to a safe place and add DEF.
Inducement strategy when abnormalities are detected in the Urea SCR System
devices (Except abnormalities in the KDPF and the EGR system)
If any abnormality is detected in the DEF quality or in the Urea SCR system, the Inducement strategy is activa-
ted.
The inducement strategy progresses in 4 levels, “Warning”,
“Continuous Warning”, “Low level Inducement” and “Severe In-
ducement”. The Inducement strategy includes visual alert by
the DEF caution lamp, the KDPF system caution lamp or the
Engine system caution lamp (1), and action level displayed on
the machine monitor (2), and the audible alert by a buzzer and
stepwise engine power deration that advances to speed limita-
tion to low idle. Engine power deration starts with action level
“L03 (Low level Inducement)” and advances to further deration
when “L04 (Severe Inducement)” is displayed. If “L03” is dis-
played, move the machine to a safe place and contact your Ko-
matsu distributor.
The content of the warning can be checked on the “SCR Information” screen of the user menu.
Perform the following procedure.
Press the menu switch on the standard screen to display the
“SCR Information” screen of the user menu.
After a lapse of 3 seconds to stop the machine, “SCR Informa-
tion” screen is displayed.
EXPLANATION OF COMPONENTS OPERATION
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