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Section 3
Operation and Maintenance
WARNING: Allow only qualified personnel to perform the following tasks.
Follow the safety instructions in this document and all other related
documentation.
WARNING: All electrically conductive equipment in the spray area must be
grounded. Ungrounded or poorly grounded equipment can store an
electrostatic charge which can give personnel a severe shock or arc and
cause a fire or explosion.
WARNING: Make sure the spray gun is grounded before spraying powder
or cleaning the spray gun with compressed air. Without a ground
connection the spray gun will become electrostatically charged. Personnel
touching the spray gun could receive a shock.
Operation
Each automatic spray gun is controlled by one gun control unit which
houses electrical controls, a bar led display, and regulators and gauges for
flow rate and diffuser air. Refer to the control unit manual for operation
instructions.
Powder volume, velocity, and atomization are controlled by the flow rate and
diffuser air pressure settings. As a starting point, set air pressures to:
Flow rate (ejector) air pressure 1.8 bar (26 psi)
Diffuser (atomizing) air pressure 2.5 bar (36 psi)
Keep the flow rate air pressure as low as possible. Maintain the same ratio
of diffuser air-to-flow rate air without reducing the charging level. Reduce
the diffuser air pressure if powder is being blown out of recesses. Build
coating thicknesses slowly. Reduce air pressures to keep overspray to a
minimum.
Experiment with the part hanger configuration and part density. Reduce the
space between parts to keep overspray to a minimum. Keep the air velocity
through the booth as close to the minimum required by law as practical
without violating safety.
Operation and Maintenance
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