Woodward 1724Electrically PoweredGovernor Systems

FEATURESn 24V operation

n Isochronous control (8290 speed control)

n Accepts load sharing accessories

n No mechanical drive

n Gain and stability adjustments tailoredto engine characteristics

EPG CONTROL SPECIFICATIONS

24 Volt Control24 Vdc (20 Vdc minimum to 32 Vdc maximum) 95 watts maximum power consumption. Abattery charger must be capable of at least fiveamps when the governor is energized.

Stability and GainThese adjustments set the speed controlsresponse to match the individual prime movercharacteristics. Slow and fast response settingsare provided with the dual-dynamics controller.

Rated SpeedA 25-turn internal potentiometer sets ratedspeed. A factory-installed external potentiometerallows 5% adjustment of rated speed.

Idle SpeedFactory set at 100% of rated. An optional 50 Kpotentiometer can be connected to set the idlespeed between 25 percent and 100 percent ofrated.

Steady State Speed BandThe control typically maintains 1/4 of onepercent of rated speed.

Ambient Temperature Range-40 C to 75 C (-40 F to 167 F)

ConstructionThe control box is constructed of cast aluminumand weighs about 1 pound (0.5 kg).*

* The 1724 actuator weighs about 16.8 pounds (7.6 kg).

ACTUATOR SPECIFICATIONS

Output Shaft0.375-36 SAE serrated shaft on each end

Ambient Temperature Range-40 C to 93 C (-40 F to 200 F)

ConstructionAluminum and steel parts. All internal partstreated for corrosion resistance. Not painted.

Work OutputMaximum work capacity over full governortravel of 35 is 1.7 ft-lbs. Internal return springsprovide operating force in the decrease-fueldirection. Additional external spring must notbe used.

FullGovernor Travel

Full PrimeMover Travel

NoLoad

Full Load

PrimeMover Stop

Prime MoverStop

AD B C

A

0 100%

A Overtravel to ensure prime mover stops are reached

B No-Load to Full-Load travel normally 2/3 of full governor travel is recommended

C Travel required to accelerate the prime mover

D Travel required to decelerate or shut down prime mover

WIRING DIAGRAM FOR8290 SPEED CONTROL

1724 WOODWARD EPG SYSTEMS

Shielded wires to be twisted pairs or twisted 3 conductor.Grounded at one end only.

No. 12 AWG or 14 AWG stranded wire. Must be as short as possible. (See max. length in chart.)

See text for voltage.

Open for minimum fuel.

For positive ground systems, switch and fuse to be located in series with battery () and terminal 2. Positive terminal becomes chassis ground. Leads from battery to terminals 1 and 2 must be direct and not pass through distribution points.Use 10 A fuse and switch.

Approximate speed change with trim potentiometer: 2.5% using a 1k ohm potentiometer 5.0% using a 2k ohm potentiometer

Approximately one second ramp time per 50 UF.Capacitor specification: 200 UF maximum. 15 WVDC minimum. Less than 30 UA DC leakage current over temperature range.

Idle range approximately 25% to 100% of rated using 50kpotentiometer. For fixed idle speed, calculate the value of the resistor:

R = 17 Kohm

Jumper if idle speed is not used.

Use a 10 amp fuse (3 AG or GBB type)

Polarity not important

Connections to load sensor when used in load sharing application

1

2

3

4

5

6

7

9

10

11

8

rated speedidle speed -1 )(

EPGSpeed ControlAccel/Decel Ramp

Capacitor (Optional) 7

1 2 3 4 5 6 7 8 9 10 11 122

3

4

10

5

2

5 9

6

8

1

Magnetic Pickup

Co

m

Auxiliary Input

(Jumper If Not Used)

Speed Trim Jumper If Not Used

IdleOpenRatedClosed

EPGActuator

Battery

+

CW

Optional

IdleOpenRatedClosed

SpeedTrim orJumper

Magnetic Pickup

Actuator24VBattery

AuxInput

++ 1 2 3 4 5 6 7 8 9 10 11 12

StartFuel Limit

Gain Stability RatedSpeed

EPG Speed Control

82431091618 GA

11

Output Shaft.375 36 (inch) Serr.(See note)

DIMENSIONAL DRAWINGS

146.0(5.75)

114.0(4.49)

64.4 (2.54)63.6 (2.50)

125.0(4.92)

119.5 (4.7)116.5 (4.59)

.250 20 (inch) thd. minimum mountingscrew thread engagement should be 9.5 mm (.37 in).Torque screws to 9 11.3 Nm (80 100 lb-in).

Note:Nominal 35 output shaft rotationUse as much of 35 as possible not less than 21.Make sure fuel control provides min. and max. fuelflow requirements.

82300A49

#8 32 (inch) Binding Head ScrewTerminal (2)

Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.

LEHX7048 1997 Caterpillar Inc. Printed in U.S.A.All rights reserved.

Additional information reference: SENR6430-01,Service manual, 524 & 1724 Electrically PoweredGovernor Systems.