Setting The Atomization Fluid Pressure; Activating And Adjusting The Electrostatics; Activating The Kv Switch; Spraying - Graco PRO AA5500sc unicarb Instruction Manual

Setting the Atomization Fluid Pressure

Atomization fluid pressure will vary based on the type
of fluid used, the flow rate desired, the fluid tempera-
ture, and the percentage of CO
recommendations of your material and equipment
supplier.
Activating and Adjusting the
Electrostatics
1. Turn on the turbine air (TA). Refer to Fig. 16.
2. The turbine air pressure should be adjusted to 30
psi (2.1 bar, 0.21 MPa) at the gun manifold inlet
when air is flowing. Do not exceed 40 psi (2.8 bar,
0.28 MPa) air pressure as there is no added
benefit and turbine life could be reduced.
Use the chart below to set the proper pressure at
the turbine hose inlet. Do not exceed these recom-
mended pressures or turbine life will be reduced.
Turbine Air Dynamic pressure at the turbine
Hose Length hose inlet required for full voltage
ft. (m)
15 (4.6)
25 (7.6)
50 (15.3)
75 (22.9)
100 (30.5)
3. Check the voltage output of the gun using a high
voltage probe and meter or by reading the ES (kV)
Display Module.
NOTE: The gun's normal high voltage reading is 60 to
70 kV. If a ball end high voltage measurement probe is
used, the gun voltage will rise to about 85 kV. This will
happen with all resistive electrostatic guns.
See Electrical Troubleshooting on page 28 to cor-
rect voltage problems.

Activating the kV Switch

Apply a minimum of 50 psi (3.5 bar, 0.35 MPa) air
pressure to the kV switch air fitting (KV) to activate it
and switch to the lower voltage setting. The lower
voltage setting is factory set to 60 kilovolts at zero
microamperes. To change this setting, see page 40.
20 308937
Operation
2
used. Follow the
psi (bar, MPa)
36 (2.5, 0.25)
38 (2.7, 0.27)
40 (2.8, 0.28)
42 (2.9, 0.29)
45 (3.1 , 0.31)
The solenoid valve used to activate the kV switch must
bleed the air out of the line for the switch to draw back
to the higher voltage setting.
TA
CYL
Manifold Back View
Fig. 16

Spraying

WARNING
ELECTRIC SHOCK HAZARD
To reduce the risk of an electric shock,
do not touch the gun electrode or come
within 4 inches (101.6 mm) of the nozzle
during gun operation.
1. Apply a minimum of 65 psi (4.5 bar, 0.45 MPa) air
pressure to the cylinder air fitting (CYL) to activate
the on/off sequence of atomization air (A2) and
fluid (P1). Refer to Fig. 16.
2. Turn the gun functions off and on by using the air
solenoid valves on the cylinder (CYL) and turbine
(TA) air supply lines.
WARNING
FIRE AND EXPLOSION HAZARD
If any fluid leakage from the gun is de-
tected, stop spraying immediately!
Fluid leakage into the gun shroud could
cause fire or explosion and result in
serious injury and property damage. See
Check for Fluid Leakage, page 25.
KV
03616