Adjust The Electrostatics - Graco 333013B Instructions - Parts Manual

Operation
5. Continue to increase the fluid pressure and spray
test patterns. Do not exceed 3000 psi (21 MPa, 210
bar) fluid pressure. When the particle size remains
constant, the fluid is being atomized at the lowest
possible fluid pressure.
For improved atomization at lower fluid flow rates,
change to a smaller tip orifice size.
6. Turn on the atomization air (A1) and adjust the air
pressure until the tails disappear.
See Spray Pattern Troubleshooting on page 34 to
correct spray pattern problems.
7. The pattern width can also be reduced by applying
fan air pressure (A2).
Too Little Air
No Air
F . 16 Eliminating Tails
IG

Adjust the Electrostatics

1. Shut off the fluid supply.
2. Prepare the isolation system for high voltage opera-
tion.
3. Turn on the turbine air (TA) and adjust the air pres-
sure per the settings in Table 1 . Set the proper
pressure at the turbine air hose inlet when air is
flowing .
Table 1. Approximate Dynamic Turbine Air
Pressures
Turbine Air Air pressure at turbine air hose inlet
Hose Length
ft (m)
15 (4.6)
25 (7.6)
36 (11)
50 (15.3)
75 (22.9)
100 (30.5)
24
Correct
Amount of Air
for full voltage
psi (bar, MPa)
54 (3.8, 0.38)
55 (3.85, 0.38)
56 (3.9, 0.39)
57 (4.0, 0.40)
59 (4.1, 0.41)
61 (4.3, 0.43)
4. Check the turbine speed of the gun by checking the
indicator light on the standard gun body or for the
smart gun check the actual turbine speed on the Pro
Xp Auto Control Module. See Table 2 . Adjust the
air pressure as necessary to keep the indicator light
green or the values within 100-750 Hz.
NOTE: Smart models display values not color indicator
lights.
Table 2. Indicator Colors/Values
Indicator
Color
Green When spraying, the indicator should
400-750 Hz remain green, indicating sufficient air
pressure to the turbine.
Amber If the indicator changes to amber after 1
<400 second, the air pressure is too low.
Increase air pressure until the indicator is
green.
Red If the indicator changes to red after 1 sec-
>750 ond, the air pressure is too high.
Decrease air pressure until the indicator is
green. Excessive turbine speed can
shorten the bearing life and will not
increase the voltage output.
5. Check the voltage output by reading the kV meter
on the isolated enclosure. 45-55 kV is normal.
See Electrical Troubleshooting, page 37 to correct
voltage problems.
Description
333013B