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WIRINg (CONTINUED)

TermInaL

DefInITIon

A & B

ACTuATOR (+/-)

PICK-uP *

C & D

(D is ground)

E & F

BATTERy (-/+)

GROuND

H & G

Droop Range

Variable Speed Input

K & L

DROOP Select

Idle Select

Accessory Input

Accessory Power Supply

Magnetic speed sensor wires connected to Terminals C and D MuST BE TWISTED AND/OR SHIELDED for their entire length. The speed sensor cable

shield should ideally be connected as shown. The shield should be insulated to insure no other part of the shield comes in contact with engine ground,

otherwise stray speed signals may be introduced into the speed control unit. With the engine stopped, adjust the gap between the magnetic speed sensor

and the ring gear teeth. The gap should not be any smaller than 0.020 in. (0.45 mm). usually, backing out the speed sensor 1/4 to 1/2 turn after touching

the ring gear teeth will achieve a satisfactory air gap. The magnetic speed sensor voltage should be at least 1.0 V AC RMS during cranking.

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.

use #16 (1.3 mm

) or larger wire. Long cables require an increased wire size to minimize

voltage drops.

•

Wires must be twisted and/or shielded for their entire length

•

Gap between speed sensor and gear teeth should not be smaller than 0.02 in. [.5mm]

•

Speed sensor voltage should be at least 1 V AC RMS during crank

•

#16 (1.3 mm

) or larger wire

•

A 15 amp fuse must be installed in the positive battery lead to protect against reverse

voltage

•

Battery positive (+) input is Terminal F must be fused for 15 amps as shown in the Wir-

ing diagram in this section to protect against reverse voltage.

Add jumper to decrease droop range

0 - 5 V DC

Droop active when closed

Close for Idle

Load Sharing / Synchronizing,

Supplies +10 V regulated supply to accessories. No more than 20 mA of current can be

drawn from this supply. Ground reference is Terminal G. A short circuit in this terminal can

damage the speed control unit.

SPeeD ranGe

900 Hz

2,400 Hz

3,000 Hz

3,500 Hz

3,700 Hz

noTeS

PoTenTIomeTer

10K

25K

50K

ESD5550-5570 Series Speed Control Unit 9-2020-E PIB1003