5
Governors America Corp. © 2020 Copyright All Rights Reserved
ESD5550-5570 Series Speed Control Unit
9-2020-E
PIB1003
5
ADJUSTMENTS
Before starting the engine, check and/or adjust the potentiometer and following settings as desired.
Before STarTInG THe enGIne
The speed control unit governed speed setting is factory set at approximately engine idle speed 1000 Hz., speed sensor signal).
Crank the engine with DC power applied to the governor system. The governor system should control the engine at a low idle speed. If the
engine is unstable after starting, turn the GAIN and STABILITy adjustments CCW until the engine is stable.
STarTInG THe enGIne
The overspeed relay output terminals offer both normally open and normally closed contacts.
1. When the engine is running at the desired speed, push and hold the TEST button.
2. Rotate the OVERSPEED adjustment CCW until the red OVERSPEED LED lights and the
relay energizes. Current to the actuator will be removed and the engine will shut off.
3. Release the TEST button.
4. After the engine stops, press the RESET button or remove battery power.
5. Restart the engine and it will return to the original speed setting.
The overspeed function is now set to approximately 10% above the requested speed.
1 2
ON
STABILITY
GAIN
SPEED
OVERSPEED
aDJUSTInG overSPeeD
aDJUSTmenT / SWITcH
PoTenTIomeTer / SWITcH
facTorY SeTTInG
noTeS
SPEED
25 turn
1470 Hz ± 50 Hz w/ min. trim
GAIN
270° turn
50%
Middle position
STABILITy
270° turn
50%
Middle position
DROOP
270° turn
0% (CCW)
IDLE
270° turn
1075± 75 Hz
STARTING FuEL RAMP
270° turn
100% (CW) Maximum Fuel
SPEED RAMP
270° turn
0% (CCW) Fastest
OVERSPEED
25 turn
100% (CW) Highest
SW1 Lead Circuit
switch
ON
SW2 Soft Coupling
switch
OFF
The engine’s exhaust smoke at start-up can be minimized by completing the following adjustments:
1. Place the engine in idle by connecting Terminals M & G.
2. Adjust the IDLE speed for as low a speed setting as the application allows.
3. 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.
4. Stop the engine.
STarTInG fUeL aDJUSTmenT
IDLe SPeeD SeTTInG
If the IDLE speed setting was not adjusted as detailed in Starting Fuel Adjustment section, then complete the following:
1. Place the optional external selector switch in the IDLE position.
2. Adjust the IDLE CW yo increase the idle speed set point.
3. When the engine is at idle speed, the speed control unit applies droop to the governor system to ensure stable operation.
