Ransburg REA Automatic Applicators 77359, 76110, 77140 - Manual (Page 12)

INTRODUCTION
DESCRIPTIONS
The REA Automatic processes are an air atomized
method for electrostatically applying coatings to
objects. The REA Automatics apply a high voltage
DC charge to the applicator electrode, creating an
electrostatic field between the atomizer and the
target object. The target is electrically grounded
through its support which may be either stationary
or moving.
A regulated pressure fluid system delivers material
to the atomizer. At the time of triggering the ap-
plicator’s fan and atomization air is applied which
atomizes the material forming a spray mist. The
mist under the influence of the electrostatic field,
becomes electrically charged. The charged par-
ticles of material are attracted to, and deposited
on, the target. The forces between the charged
particles and the grounded target are sufficient to
turn most normal overspray around and deposit
it on the back surface of the target. Therefore,
a high percentage of the spray is deposited on
the target.
One of the many features of the REA Applicator
Automatic System is the electrical discharge which
is available from the resistive charging electrode is
limited to the optimum level of safety and efficiency.
As the applicator electrode approaches ground,
the control unit and applicator circuitry shut down
the high voltage and current to the applicator. The
control unit must then be reset to continue to spray
electrostatically.
The REA Automatic Electrostatic Spray Applicators
are transformable between air spray and HVLP
spray technology. By changing a select few parts,
the applicator may be transformed to be operated
in either spray mode. (See “Spray Technology
Conversion Procedure” in the “Installation” section
for details.)
The REA 900A Applicator is designed with a mov-
ing trigger (shaft), so no forward mounted trigger
valve is required. The dump valve is mounted on
the rear bulkhead plate for ease of maintenance.
All fluid connections in this applicator use “AN”
style fittings to eliminate “dead spots” in the fluid
path for superior flushing.
The REA 9000R is a robot-mounted applicator for
hollow wrist robots produced by either FANUC or
ABB. The advantage of the REA 9000R applicator
is that it can be removed quickly and easily from
the robot mounting plate with the use of a threaded
retaining ring.
The REA 9000R incorporates two important safety
features. The first being a break-away design
that will shear two (2) nylon mounting bolts if the
applicator comes in contact with the object being
sprayed. The second is the discharge which is
available from the resistive charging electrode is
limited to the optimum level of safety and efficiency.
The REA 9000W (Not FM Approved) is an external
charge probe applicator designed to spray water-
borne coatings in systems utilizing a grounded fluid
supply. Applicator features include: Probe Shroud
Air and Electrode Shroud Air. Low pressure air
exiting around the probe body and electrode wire
aid in keeping these components clean during op-
eration. These features help to maintain maximum
efficiency of the applicators over a longer period
of time. The REA 9000W applicator also offers
conventional “classiC” high voltage technology.
The REA 9000R and 900A Series of applicators
apply -85kV DC charge to the coating materials at
the point of atomization. This series of applicators
is intended for use with grounded solventborne
coating systems. The REA 9000W Series of
applicators applies -70kV DC Charge. This elec-
trostatic charge allows a more efficient, uniform
application of coating material to the front, edges,
sides, and back of products. It is highly suitable
Ransburg
REA Automatic Applicators - Introduction
8 AA-99-02.5