Introduction
Spraying Waterborne Fluids
Electrostatically
The PRO 3500wb spray gun is a 60 kV electrostatic spray gun that is designed to spray conductive, water- borne,
A safe, well designed isolation system should have the following features:
DAll components of the isolation system that are charged to high voltage must be contained within a fence or enclosure that prohibits personnel from making contact with the high voltage components.
DA means for automatically discharging the system voltage if anyone opens the fence or enclosure.
DA bleed resistor to drain off the system voltage when the spray gun is not in use.
DThe system should not have any severe arcing occurring when the isolation mechanism opens and closes. Severe arcing will shorten the life of the system components.
When connected to a voltage isolation system, all of the fluid in the spray gun, fluid hose, and isolated fluid supply are charged to high voltage, which means that the system has more electrical energy than a solvent- based system. Therefore, only
Precautions must be taken when using electrostatic waterborne equipment to avoid potential shock haz- ards. When the spray gun charges the isolated fluid to high voltage, it is similar to charging a capacitor or battery. The system will store some of the energy while spraying and retain some of that energy after the spray gun is shut off. It is not safe to touch the front end of the gun until the stored energy is discharged. The amount of time it takes to discharge the energy de- pends on the system design. Follow the Fluid Voltage Discharge and Grounding Procedure, page 16, before approaching the front of the gun.
Do not intentionally ground out the system by arcing the electrode to ground when you are done spraying. Sudden arcs or shocks to the gun and system puts extra stress on the components and will shorten the life of the gun and fluid hose. When hanging up the gun, avoid arcing the gun to a grounded gun hanger. An optional plastic gun holster is available, which can be used to hang up the gun without causing arcs.
Operating the Electrostatics
Refer to Fig. 1, page 7
To operate the electrostatics, air pressure is supplied through a Graco electrically conductive air hose to the gun air inlet (F). When the gun is triggered, air enters the gun and is directed to the inlet of the turbine/alter- nator (T). The air spins the turbine, which then pro- vides electrical power to the power supply. The fluid is charged by the spray gun electrode (B). The charged fluid is attracted to the nearest grounded object, wrap- ping around and evenly coating all surfaces.
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