Doosan DP222LBF - Adjustment (Tuning) Order and Method; Adjusting the Engine Start-up Characteristics; Adjusting the engine operating speed and initial speed (idle)

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Adjustment (Tuning) Order and Method
1. The potentiometer’s guide range on the front of
the case is the adjustment range applied to
Doosan Infracore (Inc.) engines.
2. When adjusting the potentiometer, use a flat-
blade precision screwdriver of the right size.
(Be careful not to damage the resistor)
3. Check whether the wiring connections of all
external devices are correct before starting the
engine.
4. Adjusting the Engine Start-up Characteristics
(1) Connect the G-M terminals (turn the initial engine speed (idle) switch ON). Starting Fuel
IMPORTANT
Purpose of adjustment: Adjusting to the most economical amount of fuel based on the state
of the engine installed.
Recommended direction: 1 o’clock to 5 o’clock
Problems when adjusted incorrectly: In the 7 o’clock to 1 o’clock direction, there is not
enough fuel, which may cause faulty starting. In the 5 o’clock or higher direction, fuel
efficiency worsens during starting and the amount of exhaust gas may increase.
(2) Adjust the speed ramping potentiometer in the 9 o’clock to 12 o’clock direction.
IMPORTANT
The farther it is turned clockwise, the longer it takes to reach the rated (run) speed.
(Up to 10 seconds or more)
If the value is too low, overshoot or hunting may occur due to sudden increases in speed.
Fuel efficiency may worsen and the amount of exhaust gas may increase.
(3) Start the engine: Turn on the start motor.
5. Adjusting the engine operating speed and initial speed (idle)
(1) Adjust the engine operating speed (frequency).
IMPORTANT
After starting the engine, disconnect the G-M terminal. (Turn the initial speed switch OFF)
Adjust the speed (frequency) with the speed potentiometer while in an unloaded state.
Clockwise: RPM increases / counterclockwise: RPM decreases
DV2213193B
Starting
Fuel
Speed
Ramping
Idle
DV2213193C
Droop