Graco PRO Xs4 AA manual Introduction, How the Electrostatic AA Spray Gun Works

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Introduction

Introduction

How the Electrostatic AA Spray Gun Works

WARNING

Fluid Injection Hazard

Remember, this is not an air spray gun. For your safety, read and follow all Warn- ings in this manual.

The air-assisted spray gun combines airless and air spraying concepts. The spray tip shapes the fluid into a fan pattern, as does a conventional airless spray tip. Air from the air cap further atomizes the fluid and com- pletes the atomization of the fluid tails to produce a uni- form pattern.

As the gun is triggered, part of the regulated air oper- ates the turbine and the rest of the air atomizes the fluid being sprayed. The turbine generates power, which is converted by the power cartridge to supply high volt- age current to the gun’s electrode.

The regulated air that is directed to the air cap can be further controlled using the gun’s atomizing air adjust- ment valve. This valve can be used to restrict air flow to the air cap while maintaining sufficient air flow to the turbine.The atomizing air adjustment valve does not control pattern width. To change pattern width, a new tip size must be used.

The high working fluid pressure of this gun provides the power needed to atomize higher solids materials.

The gun’s internal power supply provides high voltage current. The fluid is electrostatically charged as it passes the electrode. The charged fluid is attracted to the grounded workpiece, wrapping around and evenly coating all surfaces.

NOTE: For airless atomization, if desired, turn the gun’s atomizing air adjustment valve completely off. Closing this valve does not affect turbine operation.

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Contents This manual contains important warnings and information Instructions Parts List 309295Standard Model Table of Contents List of Models SymbolsModel Description Operation Fire, Explosion, and Electric Shock Hazard Toxic Fluid Hazard Fluid Injection HazardEquipment Misuse Hazard How the Electrostatic AA Spray Gun Works IntroductionSmart Gun Gun Overview= on = OFF Standard GunFlammable or Toxic Vapor Hazard InstallationInstall the System Ventilate the Spray BoothHazardous Area Non-Hazardous AreaConnect the Exhaust Tube Connect the Air LineElectric Shock Hazard Select a Spray Tip Connect the Fluid LineGrounding Check Gun Grounding Check Electrical GroundingCheck Fluid Viscosity Check Fluid ResistivityOperation Low Voltage Adjustment Smart Guns OnlyFlush the Spray Gun MaintenanceTi1465a Test Gun Resistance Electrical TestsTest Power Supply Resistance Test Power Supply ResistanceTest Barrel Resistance Test Barrel ResistanceSpray Pattern Troubleshooting TroubleshootingProblem Cause Solution Gun Operation Troubleshooting Electrical Troubleshooting Repair Pressure Relief ProcedureTools Needed Prepare the Gun for ServiceTip Guard, Air Cap, and Spray Tip Replace- ment Tip Guard, Air Cap, Spray Tip, or Seat Housing ReplacementRepair Electrode Replacement Electrode ReplacementFluid Filter Removal Fluid Tube ReplacementSpring Cap and Springs Fluid Needle ReplacementBarrel Removal Barrel InstallationPower Supply and Turbine Alternator Power Supply Removal and ReplacementTurbine Alternator Removal and Replacement Atomizing Air Adjustment Valve Atomizing Air Adjustment Valve RepairAir Valve Air Valve RepairES ON/OFF Valve ES ON/OFF Valve RepairPart No 85 kV Electrostatic Gun, Series a items PartsRef. No Alternator Ref. No Atomizing Air Adjustment ValveRef. No ES ON/OFF Valve AIR CAP Description QtyIncluded in Air Seal Repair Kit 53 Ref Adjustment valve 20, and ES ON/OFF valveRef. No Alternator Description Qty SWITCH, ES HI/LO Air Line Accessories AccessoriesFluid Line Accessories Miscellaneous Accessories Gun AccessoriesFan Width at Orifice Size Spray Tip Selection ChartCategory Data Technical DataGraco Phone Numbers Graco Standard WarrantyToll Free