Ransburg Evolver Solvent Robot Applicator 79190-XXXXXXXX - Manual (Page 25)

OPERATION
SPRAY GUN CONTROLS
Atom (A) / Fan Air (F)
The atomization and fan air are turned on by the
trigger line and are controlled by an internal air
valve located in the gun head. During normal
operation with gun triggered off, there is a slight
bleed of air through the atomization part.
Atomizing Air
Adjustments are made through the robot PLC or
a manually adjustable air regulator. The lowest
air pressure required to break up the paint should
be used. Lower atomizing air pressures result in
less overspray and increased transfer efficiency.
Fan Air
Adjusting the fan air increases or decreases the
size of the spray pattern. Increasing pressure
increases pattern size. Pattern adjustment should
be made to suit the size and shape of the object
being painted. This adjustment is made through the
robot PLC or a manually adjustable air regulator.
Air cap pressures should be set using air cap test
kit. This provides a consistent measurement, so
initial settings may be duplicated at any time. (See
"Parts Identification" section for "Air Cap Test Kit
part numbers".)
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Insure that the fan and atomization air
are on and flowing prior to triggering the
fluid. Failure to follow this sequence will
cause spits and defects on the part being
painted.
NOTE
HVLP SPRAY
The Evolver HVLP models, when properly set-up,
are designed to provide maximum transfer effi-
ciency by limiting air cap pressures to 10 psi (0.7
bar) (in the U.S., this complies with rules issued
by SCAQMD and other air quality authorities).
Air cap pressures should be measured with an
optional air cap test kit. (See "Accessories" in
the "Maintenance" section.)
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For HVLP operation (max. 10 psi, -0.7
bar cap pressure), DO NOT exceed the
air inlet pressure, which was read at the
gun base before the tubing manifolds,
given as follows:
PSI (Bar) CAP #
42 (2.9) 48-1
42 (2.9) 481-1
NOTE
BACK PRESSURE -
48-1 and 481-1
Due to the unique cone shape of the MP fluid tips
(nozzle), a slight back pressure is created against
the fluid column. This will reduce the amount of
fluid output. To compensate, increase the fluid
regualtor pressure slightly if necessary. With 10
psi (0.7 bar) cap pressure, back pressures are
approximately 3.5 psi (0.24 bar).
Evolver Solventborne Robotic Atomizers - Operation
21
Ransburg
AA-03-02.12