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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
WARNING
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.
3-3/4 in. (95 mm)
12-1/4 in. (311 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)
7/8 in.
(22 mm)
5-1/2 in. (140 mm)
15 in. (381 mm)
6-3/4 in. (171 mm)
3-13/16 in.
(
97 mm
)
5
i
n.
(12
7 mm
)
Flex-Link Assembly
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 oper-
ating point. When demand changes, pointer touches appropri-
ate high or low contact and signals speed change. AT03069
controller responds only so long as contact is made. The con-
troller 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.