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AT-04052B page 1 of 2
■
Automatically adjusts engine speed
to meet demands of pressure, level,
load and temperature.
■
Speed changes made slowly and smoothly.
■
Saves fuel, engine wear, horsepower
and labor.
■
Perfect for warm-up and cool-down on auto-
mated systems.
■
One model for both 12 and 24 VDC systems.
Description
The AT03069 is a completely reliable heavy
duty device developed specifically to auto-
matically control engine speed to meet sys-
tem demand. Low current, high torque, solid
state switching and electronic clutch make it
ideal for all automatic and semiautomatic
engine systems. Used with the appropriate
Murphy SWICHGAGE
®
, near constant
pressure, level and load can be maintained.
Check with our engineers for help with
other applications where speed control can
improve your system.
Applications
Pressure
•
City Water Systems.
•
Water Flood Injection.
•
Sprinkler Lateral Changes.
•
Make-up if a “Gang Pump” stops.
•
Multiple Hose-reel Irrigation Systems.
Level
•
Water or oil storage tanks.
•
Waterflood tanks.
•
Sewer disposal systems.
•
Flood control catch basins.
Temperature
•
Multi-engine cooling systems.
•
Air conditioned chilled water systems.
Engine load
Empty or fill reservoirs with a lower
horsepower engine—fast when head is
high—slow when head is low.
Specifications
Voltage: 11-28 VDC negative ground.
Maximum Current: 500 mA (1/2 amp).
Standby Current: Approx. 7 mA.
Increase and Decrease: Inputs float at
approx. 8.4 VDC. Grounding inputs causes
8-18 mA of current to flow from either.
Torque: 25 inch pounds.
Sealed limit switches: Factory adjusted,
controls maximum travel.
Linkage adjustment on lever arm—5 holes:
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 voltage and force applied.
Dimensions: See reverse side.
Net Weight: 5 lb. (2.27 kg)
Features
The AT03069 can enhance features of our
SELECTRONIC
®
Micro-Controller units
by allowing features such as:
•
Warm-up RPM Set point.
•
Minimum RPM Set point.
•
Maximum RPM Set point.
•
Preset Operating RPM Set point.
•
Auto Throttling To Match Flows
(as needed in flood control applications).
•
Maintaining System Pressure (as needed
in booster station application).
•
Adjustable Rate Of Change In RPM
(allowing fine tuning of overall system).
For more information, recommendations
and quotations contact our engineering dept.
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
Model AT03069
AT-04052B
Revised 04-04
Replaces AT-98113B
Catalog Section 40
(00-02-0567)
MURPHYMATIC
®
Engine
Throttle Controller