Introduction
6
333011D
Introduction
How the Electrostatic AA Spray
Gun Works
The electrostatic air-assisted spray gun combines air-
less and air spraying concepts. The spray tip shapes the
fluid into a fan pattern, as does a conventional airless
spray tip. Air from the air cap further atomizes the fluid
and completes the atomization of the fluid tails to pro-
duce a uniform pattern.
The high working fluid pressure of this gun provides the
power needed to atomize higher solid materials.
Operating the Spray Function
Applying a minimum of 60 psi (0.42 MPa, 4.2 bar) air
pressure to the gun manifold’s cylinder air fitting (CYL)
will retract the gun piston, which opens the air valves
and a short time later opens the fluid needle. This pro-
vides the proper air lead and lag when triggering the
gun. A spring returns the piston when the cylinder air is
shut off.
Operating the Electrostatics
To operate the electrostatics, apply air pressure to the
gun manifold’s turbine air fitting (TA) through a Graco
Grounded Turbine Air Hose. The air enters the manifold
and is directed to the inlet of the power supply turbine.
The air spins the turbine, which then provides electrical
power to the internal high voltage power supply. The
fluid is charged by the spray gun electrode. The charged
fluid is attracted to the nearest grounded object, wrap-
ping around and evenly coating all surfaces.
Gun Features and Options
•
The gun's full voltage setting is 85kV.
•
The gun is designed for use with a reciprocator, and
can be mounted directly on a 1/2 in. (13 mm) rod.
With additional brackets, the gun can be mounted
for robotic applications.
•
The gun’s quick-disconnect design enables its
removal without disconnecting air lines to the gun.
•
Gun functions are activated from a separate control-
ler that sends the appropriate signal to the actuating
solenoids.
Smart Gun Features
Smart gun models with the Pro Xp Auto Control Module
have the ability to:
•
Display the spraying voltage and current
•
Change the gun voltage setting
•
Display the gun turbine speed
•
Store spray profiles
•
Communicate equipment faults to a PLC
•
Display and set maintenance totalizers
•
Use a PLC to select a spray profile
See the Pro Xp Auto Control Module manual 332989 for
more information.
This is not an air spray gun. To help prevent serious
injury from pressurized fluid, such as skin injection,
and splashing fluid, read and follow the Skin Injection
Hazard Warnings on page 4.
