Doosan DX480LC - Engine Control System

SP002030Electrical System
Page 62
ENGINE CONTROL SYSTEM
When the engine control dial is moved the output voltage
changes according to the dial position. This signal is input to the
engine throttle controller. The engine throttle controller then
compares the input voltage from the engine speed dial with the
feedback signal from the throttle position sensor built into the
engine control motor and drives the motor to the position set by
the control dial. When the command signal and the
potentiometer feed back signals are the same the engine
controller shuts off the current to the control motor. The engine
control motor cable is a solid type and is connected to the
engine fuel injection control lever. The engine speed is
controlled by the movement of the fuel injection lever which is
directly linked with the rotation of the control motor.
e-EPOS CONTROLLER
5V
RETRACT
M
10A
2
1
3
SIG
7
(-)
6
(+)
8
5V
5
5
4
5
9
HIGH
LOW
2
12
3
1
SIG
(-)
(+)
2
3
1
CW
AUTO IDLE COMMAND
OVER HEAT
17
10
(Command Signal)
(Drive Signal)
M
P
(Feedback Signal)
BATTERY
BATT. RELAY
ARS1090L
16
16
15
15
2
2
3
Figure 58
Reference
Number
Description
2 Engine Control Motor
3Engine
15 Engine Throttle Controller
16 Engine Control Dial
Reference
Number
Description