Doosan V158TI Operation & Maintenance Manual page 202

2. System not working properly
In the event that the system is not running properly, perform the following test.
Item
Engine
overspeeds
The actuator Is not
working properly
Operating at
speed less than
that required by
the engine
Details
1. Do not run the engine
2. Apply a DC power supply to
the actuator.
Manually maintain the speed
required for engine operation.
Measure the DC voltage
between terminals A (-)
and F (+) of the speed controller.
1. Measure the battery voltage
while the engine is running.
2. If terminals A and F are
connected momentarily, the
actuator should move to the
position for maximum fuel
supply.
a 1. Measure the voltage at out-
put terminals A and B of the
actuator while the engine is
running.
1. The actuator will move to the position for
maximum fuel supply. Then disconnect the
magnetic pick-up sensor connected to ter-
minals C and D.
(1) If the actuator moves to the position for
maximum fuel supply: There is a prob-
lem in the controller.
(2) If the actuator is in a neutral fuel posi-
tion: This is due to the wrong speed
signal for the engine speed
1. When the voltage is between 1.0 ~ 2.0V DC
(1) The speed potentiometer is set higher
than the required speed.
(2) There is a fault in the engine speed
controller.
2. The actuator or connecting device is
restricted when the voltage exceeds
2.0V DC
3. When the voltage is less than 1.0V DC
(1) There is a fault in the speed controller.
4. The gain value is too low
1. Replace the battery if the voltage is less
than 7V in a 12V system or less than 14V
in a 24V system.
1. Fault in the actuator or battery wiring
2. Restricted by the actuator or connecting
link
3. Faulty actuator
4. Check for a blown fuse in the actuator or a
short circuit in the actuator wiring.
1. If the measured voltage has a difference of
less than 2V with the battery voltage, the
fuel control is being obstructed such that it
cannot reach the maximum fuel supply
position, presumably due to interference
from the actuator linkage.
2. The speed setting is too low
- 14 -
Specifications