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ESD5500E Series Speed Control Unit 2-2021-F2 PIB1002
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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.
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gOvERNOR SPEED SETTINg
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ADJUSTmENTS BEFORE ENgINE STARTUP
Make sure the following adjustments are set before starting the engine.
GAIN
Middle Position
STABILITY
Middle Position
SPEED TRIM CONTROL
Middle Position
STARTING FUEL
Full CW (MAX fuel)
SPEED RAMPING
Full CCW (fastest)
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
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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.
Parameter
ProceDure
GAIN
1. Rotate the GAIN adjustment clockwise until instability develops.
2. Gradually move the adjustment counterclockwise (CCW) until stability returns.
3. Move the adjustment one division further counterclockwise to ensure stable performance (270° potentiometer).
4. If instability persists, adjust the next parameter.
STABILITY
Follow the same adjustment procedure, steps 1 - 3, as the GAIN parameter.
Normally, adjustments made at no load achieve satisfac-
tory performance. If further performance improvements
are required, refer to Section 12
note
IMPORTANT:
Speed Adjustment Is a 25
Turn Potentiometer
