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WIRINg (CONTINUED)

acceSSorY InPUT

Auxiliary Terminal N accepts input signals from load sharing units, auto synchronizers, and other governor system accessories.

GAC accessories are directly connected to this terminal. Terminal N connections must be shielded.

If the auto synchronizer is used alone, not in conjunction with a load sharing module, a 3 Ω resister should be connected between

noTe

Terminals N and P. This is required to match the voltage levels between the speed control unit and the synchronizer.

acceSSorY SUPPLY

Terminal P supplies +10 volt regulated supply to provide power to GAC governor system accessories. up to 20 mA of current can be drawn

from this supply. Ground reference is Terminal G.

A short circuit on Terminal P can damage the speed control unit.

aDDInG a PoTenTIomeTer

use a single remote speed adjustment potentiometer to

adjust engine speed. Select the desired speed range and the

corresponding potentiometer value.

If the exact range is not found select the next higher range

potentiometer. Connect the potentiometer as shown in the

WIRING diagram.

ADJUSTMENTS

Before STarTInG THe enGIne

Before starting the engine, check and/or adjust the potentiometer and following settings as desired.

aDJUSTmenT / SWITcH

SPEED

GAIN

STABILITy

DROOP

IDLE

STARTING FuEL RAMP

SPEED RAMP

OVERSPEED

SW1 Lead Circuit

SW2 Soft Coupling

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.

SPeeD ranGe

PoTenTIomeTer / SWITcH

25 turn

270° turn

25 turn

switch

PoTenTIomeTer

900 Hz

2,400 Hz

3,000 Hz

10K

3,500 Hz

25K

3,700 Hz

50K

facTorY SeTTInG

1470 Hz ± 50 Hz w/ min. trim

50%

0% (CCW)

1075± 75 Hz

100% (CW) Maximum Fuel

0% (CCW) Fastest

100% (CW) Highest

OFF

ESD5550-5570 Series Speed Control Unit 1-2021-E1 PIB1003

noTeS

Middle position