Komatsu ecot3 PC300LC-8 Shop Manual page 261

10 Structure, function and maintenance standard
Operation of system
Starting engine
q When the starting switch is turned to the
START position, the starting signal flows to the
starting motor. Then, the starting motor turns to
start the engine.
When it happens, the engine controller checks
the signal voltage from the fuel control dial and
sets the engine speed to the speed set by the
fuel control dial.
Engine speed control
q The fuel control dial sends a signal voltage cor-
responding to the rotation angle to the engine
controller.
q The pump controller receives the fuel dial posi-
tion information from the engine controller
through the network.
q The pump controller calculates the engine
speed in accordance with the working mode,
the decelerate, and the like, and sends an
instruction to the engine controller.
q The engine controller determines the fuel injec-
tion quantity based on the instruction received
from the pump controller.
PC300, 350-8
Stopping engine
q When detecting that the starting switch is set to
the "STOP" position, the engine controller cuts
the fuel injection to stop the engine.
SEN01998-05
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