GAC ESD5500E Series Manual - Page 4

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ADJUSTmENTS BEFORE ENgINE STARTUP

Make sure the following adjustments are set before starting the engine.

GAIN

STABILITY

SPEED TRIM CONTROL

STARTING FUEL

SPEED RAMPING

START ThE ENgINE

The speed control unit governed speed setting is factory set at approximately engine idle speed. (1000 Hz., speed sensor signal or 600 RPM)

If the engine does not start, adjustment of the speed potentiometer may be required.

Crank the engine with DC power applied to the governor system. The actuator will energize to the maximum fuel position until the engine

starts. The governor system should control the engine at a low idle speed. If the engine is unstable after starting, refer to Section 8 ADJUST-

ING FOR STABILITY.

gOvERNOR SPEED SETTINg

The governed speed set point is increased by clockwise rotation of the

SPEED adjustment control. Remote speed adjustment can be obtained

with an optional 5 kΩ Speed Trim Control potentiometer.

ADJUSTINg FOR STABIlITy

Once the engine is running at operating speed and at no load, the

following governor performance adjustments can be made to increase

engine stability.

Normally, adjustments made at no load achieve satisfac-

note

tory performance. If further performance improvements

are required, refer to Section 12 TROUBLESHOOTING.

Parameter

GAIN

Rotate the GAIN adjustment clockwise until instability develops.

Gradually move the adjustment counterclockwise (CCW) until stability returns.

Move the adjustment one division further counterclockwise to ensure stable performance (270° potentiometer).

If instability persists, adjust the next parameter.

STABILITY

Follow the same adjustment procedure, steps 1 - 3, as the GAIN parameter.

Middle Position

Full CW (MAX fuel)

Full CCW (fastest)

IMPORTANT:

Speed Adjustment Is a 25

Turn Potentiometer

ProceDure

ESD5500E Series Speed Control Unit 2-2021-F2 PIB1002