Daewoo ST Series Instrucciones de operaciones descargar pdf (Pagina 135)

5. Starting Fuel Adjustment

The engine’s exhaust smoke at start-up can be minimized by completing the

following adjustments.

Place the engine in idle by connecting Terminals M & G.

Adjust the IDLE speed for as low a speed setting as the application allows.

Adjust the STARTING FUEL CCW until the engine speed begins to fall, Increase the

STARTING FUEL slightly so that the idle speed is returned to the desired level.

Stop the engine.

One of two methods of operation for the ESD5550 may now be selected.

Method 1) : Start the engine and accelerate directly to the operating speed (Generator Sets, etc.)

Remove the connection between Terminals M & G. Start the engine and adjust the

SPEED RAMPING for the least smoke on acceleration from idle to rated speed.

If the starting smoke is excessive, the STARTING FUEL may need to be adjusted

slightly CCW. If the starting time is too long, the STARTING FUEL may need to be

adjusted slightly CW.

Method 2) : Start the engine and control at an idle speed for a period of time prior to accelerating

to the operating speed. This method separates the starting process so that each may

be optimized for the lowest smoke emissions.

Replace the connection between Terminals M & G with a switch, usually an oil

pressure switch. Start the engine. If the starting smoke is excessive, the

STARTING FUEL may need to be adjusted slightly CCW. If the starting time is too

long, the STARTING FUEL may need to be adjusted slightly CW.

When the switch opens, adjust the SPEED RAMPING for the least amount of

smoke when accelerating from idle speed to rated speed.

6. Idle Speed Setting

If the IDLE speed setting was not adjusted as detailed in “Starting Fuel Adjustment” section, then

place the optional external selector switch in the IDLE position. The idle speed set point is

increased by clockwise rotation of the IDLE adjustment control. When the engine is at idle speed,

the speed control unit applies droop to the governor system to insure stable operation.

7. Speed Droop Operation

Droop is typically used for the paralleling of engine driven generators.

Place the optional external selector switch in the DROOP position, DROOP is increased by

clockwise rotation of the DROOP adjustment control. When in droop operation, the engine speed

will decrease as engine load increases.

The percentage of droop is based on the actuator current change from engine no load to full load.

A wide range of droop is available with the internal control. Droop level requirements above 10%

are unusual.

If droop levels experienced are higher or lower than those required, contact the factory for

assistance.

After the droop level has been adjusted, the rated engine speed setting may need to be reset.

Check the engine speed and adjust the speed setting accordingly.

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Daewoo ST Series Instrucciones de operaciones Pagina 135