Murphy AT-04060N User Manual

Installation AT-04060N page 1 of 2

Installation and Operation Manual for
MURPHYMATIC

®

Engine Throttle Controller

Model AT03069

AT-04060N

Effective 04-04

Section 40

00-02-0568

Description

The AT03069 is a heavy duty device developed specifically to automatically
control engine speed to meet system demand. It is typically applied to the throttle
butterfly on a natural gas engine, but may also be applied to various diesel or
gasoline engines. Low current, high torque, solid state switching and electronic
clutch make it ideal for all automatic and semiautomatic engine systems.

Specifications

Voltage: 11-28 VDC negative ground.
Maximum Current: 200 mA @ 25 in-lb.
Standby Current: Approx. 7 mA.
Increase and Decrease: Inputs float at approx. 8.4 VDC. Grounding inputs causes

8 to 18 mA of current to flow from either depending upon force.

Torque: 25 inch pounds.
Sealed limit switches: Factory adjusted, controls maximum travel.
Linkage adjustment on lever arm: Adjusts travel: 1-3/16 in. (30 mm);

1-11/16 in. (43 mm); 2 in. (51 mm); 2-1/4 in. (57 mm) approximately.

Travel Time: 11 to 20 seconds depending on the force required.
Net Weight: 5 lb. (2.27 kg)

Please read the following information before installing. A visual inspection of this product for damage during shipping is recommended

before mounting. It is your responsibility to have a qualified person install this unit and make sure it conforms to NEC and local codes.

GENERAL INFORMATION

BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT

✔ Disconnect all electrical power to the machine.
✔ Make sure the machine cannot operate during installation.
✔ Follow all safety warnings of the machine manufacturer.
✔ Read and follow all installation instructions.

)

i
(12

)

Dimensions

Front

Side

Drill Guide

(Not to scale)

Operation

A Murphy SWICHGAGE®* constantly monitors pressure,
level, temperature or load. Adjustable high and low contacts on
SWICHGAGE®are set slightly above and below desired oper­ating point. When demand changes, pointer touches appropri­ate high or low contact and signals speed change. AT03069
controller responds only so long as contact is made. The con­troller stops immediately when contacts separate. Slow,
smooth action prevents “hunting” or “surging” on normal
applications.

*Mercury tube or snap-action switches are not suitable for this type control.

For more information, recommendations and quotations contact our
engineering department.

WARNING

3-3/4 in. (95 mm)

6-3/4 in. (171 mm)

3-13/16 in. (97 mm

5
n.

7 mm

7/8 in.

(22 mm)

5-1/8 in. (130 mm)

5-7/8 in. (149 mm)

3-5/8 in. (92 mm)

4-3/4 in. (121 mm)

5-1/2 in. (140 mm)

12-1/4 in. (311 mm)

Flex-Link Assembly

15 in. (381 mm)

Installation AT-04060N page 2 of 2

When applying the AT03069, please consider the operating environ­ment. The case is designed to shed water from the top, but will collect
water if mounted upside down. The control linkage has been specially
designed to isolate vibration from the gear motor on the throttle actuator
directly to the outer case. this control linkage must be used or vibration
may seriously damage the internal gear motor. The flex linkage assem­bly has been removed for shipping and must be installed before use. The
flex linkage assembly may be installed in the right or left hand slots on
the sides of the throttle actuator. The AT03069 must be mounted close
to, and in line with, the throttle block for straight line pull between the
lever arm and the butterfly lever arm.

NOTE: The throttle actuator should be mounted in a manner that
minimizes the effects of excessive shock and vibration on the unit.

A separate throttle block must be used if the engine is equipped with a
governor or a manual control wire. The AT03069 is not designed to
override other controls. The butterfly valve must work freely.

Typical Wiring

1. Connect terminal #1 to battery (+).

2. Connect terminal #4 to battery (-).

3. Advance the lever arm to the full idle RPM position (fully clockwise or counter­clockwise by grounding #2 or #3 -- See above at left.)

4. Connect the flex linkage wire to the butterfly lever arm. Alternately ground terminal
#2 and #3 to determine the direction of travel. Select the proper mounting hole in
the lever arm of the AT03069 and on the throttle block butterfly arm to provide
proper travel. The proper throttler travel is from the mechanical set idle point, to
just slightly above the point where the mechanical governor limits the engine RPM.

5. Visually inspect the linkage assembly to insure that there are no sharp bends or
kinks. If the linkage wire bows during operation, a center support should be added.

6. After correct travel is established, tighten the set screws and linkage assembly.

NOTE: The lever arm must be allowed to travel its full arc. This allows the unit to
disconnect itself with internal limit switches. If the lever is unable to reach limit
switches, Damage to the unit can occur.

INSTALLATION and WIRING

IMPORTANT:

The AT03069 works on both 12 and 24 VDC systems. System volt­age should be between 11 and 28 VDC. Exceeding 28VDC can cause damage. The
automatic throttle controller is used by alternately grounding terminals 2 and 3 to

maintain the desired engine RPM. The AT03069 is typically used to automatically adjust the
engine speed to maintain a desired discharge pressure on an engine-driven pump.

AT03069

Back View

AT03069

Front View

CONTROL SYSTEMS & SERVICES DIVISION

P.O. Box 1819; Rosenberg, Texas 77471; USA
[phone] fax [phone]

e-mail [e-mail]

MURPHY DE MEXICO, S.A. DE C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
[phone] fax [phone]
Villahermosa Office [phone]
e-mail [e-mail]
www.murphymex.com.mx

FRANK W. MURPHY, LTD.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
[phone] fax [phone]
e-mail [e-mail]
www.fwmurphy.co.uk

MURPHY SWITCH OF CALIFORNIA

41343 12th Street West
Palmdale, California 93551-1442; USA
[phone] fax [phone]
e-mail [e-mail]
www.murphyswitch.com

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.

MACQUARRIE CORPORATION

1620 Hume Highway
Campbellfield, Vic 3061; Australia
[phone] fax [phone]

e-mail [e-mail]

FW Murphy

P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone]

fax [phone]
e-mail [e-mail]

www.fwmurphy.com

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USA–ISO 9001:2000 FM 28221

UK–ISO 9001:2000 FM 29422

Printed in U.S.A.

Warranty

A limited warranty on materials and workmanship is given with this FW Murphy product.

A copy of the warranty may be viewed or printed by going to www.fwmurphy.com/support/warranty.htm

A second swivel is provided for

use on the butterfly valve lever arm.

1234

Battery (+)

Battery (-) Causes

Shaft to Rotate

Counter-Clockwise

Flex-linkage Assembly

Battery (-)

Battery (-) Causes
Shaft to Rotate
Clockwise