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INSTRUCTIONS-PARTS LIST 307912
Rev. AC
This manual contains important
warnings and information.
READ AND KEEP FOR REFERENCE.
INSTRUCTIONS
Model PRO 3500sc
Electrostatic Air Spray Gun
65 kV, MANUAL GUN
100 psi (7 bar, 0.7 MPa) Maximum Working Pressure
Part No. 222300, Series B
With Two-Finger Trigger
Part No. 222600, Series B
With Four-Finger Trigger
Part No. 222300 shown
NOTE: Any modification of genuine Graco parts or replacement of parts with non-Graco parts will void agency approvals.
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Table of Contents Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Prepare the Gun for Service . . . . . . . . . . . . . . . . . . . . 22 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Air Cap/Nozzle/Resistor Stud Replacement . . . . . . 22 Electrode Replacement . . . . . . . . . . . . . . . . . . . . . . . . 23 Introduction . . . . . .
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WARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD Improper grounding, poor air ventilation, open flames, or sparks can cause a hazardous condition and result in a fire, explosion, or electric shock. Electrostatic equipment must be used only by trained, qualified personnel who understand the requirements stated in this instruction manual. Ground the equipment, personnel in or close to the spray area, the object being sprayed, and all other electrically conductive objects in the spray area. S
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WARNING PRESSURIZED EQUIPMENT HAZARD Spray from the gun, hose leaks, or ruptured components can splash fluid in the eyes or on the skin and cause a serious injury. Do not point the spray gun at anyone or any part of the body. Do not stop or deflect fluid leaks with your hand, body, glove, or rag. Follow the Pressure Relief Procedure on page 11 whenever you: are instructed to relieve the pressure; stop spraying; clean, check, or servicing the equipment; and install or clean the fluid nozzle
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Introduction How the Electrostatic Air Spray Gun Works The air hose supplies air to the spray gun. Part of the The pump supplies fluid to the hose and gun, where air operates the turbine and the rest of the air atomizes the fluid is electrostatically charged as it passes the the fluid being sprayed. The turbine generates power, electrode. The charged fluid is attracted to the which is converted by the power cartridge, to supply grounded workpiece, wrapping around and evenly high voltage current
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Installation KEY A Main Air Supply Line P Air Supply Line Shutoff Valve B* Ventilation Fan Interlock Solenoid Valve Q* Air Hose Ground Wire C* Main Air Supply Shutoff Valve (bleed-type) R* Graco Electrically Conductive Air Hose D Air & Water Separator S Electrostatic Spray Gun E* Pump Air Supply Shutoff Valve (bleed-type) T Air Line Drain Valve F Air Line Lubricator U* Fluid Drain Valve G Air Pressure Regulator V Gun Air Inlet H Pump W Gun Fluid Inlet J* Pump Ground Wire X Gun Exhaust Tube K Flu
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Installation 5. Install an air line lubricator (F) as close to the Connect the Air Line (Refer to Fig. 1) pump (H) as possible. WARNING 6. Install an air shutoff valve (P) on each gun air supply line to shut off air to the gun(s). ELECTRIC SHOCK HAZARD To reduce the risk of an electric shock or Connect the Exhaust Tube other serious injury, the air supply hose must be electrically connected to a true Press the exhaust tube (provided) onto the barbed earth ground. Use Only Graco Electrically Con
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Installation 4. All air and fluid lines must be properly grounded. Ground the System Use only grounded hoses with a maximum of 500 feet (150 m) combined hose length to ensure WARNING grounding continuity. FIRE, EXPLOSION, AND 5. All electric cables must be properly grounded. ELECTRIC SHOCK HAZARD When operating the electrostatic device, 6. All persons entering the spray area: their shoes any ungrounded objects in the spray must have conductive soles, such as leather, or area (such as people, co
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Installation b. If using a red turbine air hose, use an ohmme- Check the Electrical Grounding (See Fig. 2) ter to measure the resistance. Resistance should not exceed 100 ohms. WARNING 6. If the resistance is greater than the maximum FIRE, EXPLOSION, AND reading specified above for your hose, check the ELECTRIC SHOCK HAZARD tightness of the ground connections and be sure Megohmmeter P/N 241079 (AA-see Fig. the air hose ground wire is connected to a true 2) is not approved for use in a hazard- e
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Notes 10 307912
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Operation Pressure Relief Procedure Operating Checklist Check the following list daily, before starting to operate WARNING the system, to help ensure safe, efficient operation. PRESSURIZED EQUIPMENT HAZARD ____ 1. All the operators are properly trained to The system pressure must be manually relieved to safely operate an electrostatic air spray prevent the system from starting or spraying acci- system as instructed in this manual. dentally. To reduce the risk of an injury from electric shock, a
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Operation DD 31 26 45 43 05151A 20 1 06443 Fig. 4 Selecting a Fluid Nozzle and Air Cap Operating the Spray Gun WARNING WARNING PRESSURIZED EQUIPMENT HAZARD PRESSURIZED EQUIPMENT HAZARD To reduce the risk of an injury, follow the Pressure To reduce the risk of an injury, follow the Pressure Relief Procedure on page 11 before removing or Relief Procedure on page 11 whenever you stop installing a fluid nozzle and/or air cap. spraying and whenever you are instructed to relieve pressure. The gun is s
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Operation 7. Set the atomizing air valve (31) about 1.5 turns out Operating the Spray Gun (continued) for most applications. The Atomizing Air Valve 1. Follow the Operating Checklist on page 11. Adjustment chart shows the effect of the atomiz- ing air valve adjustment on the air cap air flow. 2. To adjust the air cap for a vertical or horizontal spray pattern, first make sure the pressure is 8. Adjust the pattern width with the fan air valve (43). relieved. Then loosen the air cap retaining nut,
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Operation 1. Relieve the pressure. Shutdown 2. Flush and clean the equipment. Follow the instruc- WARNING tion in Maintenance. PRESSURIZED EQUIPMENT HAZARD To reduce the risk of an injury, follow the Pressure Relief Procedure on page 11 whenever you stop spraying and whenever you are instructed to relieve pressure. Maintenance 1. Clean the fluid and air line filters daily. Daily Care and Cleaning 2. Clean the outside of the gun daily with a soft cloth WARNING dampened in a compatible solvent. PR
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Maintenance Clean the Air Cap and Fluid Nozzle WARNING PRESSURIZED EQUIPMENT HAZARD CAUTION To reduce the risk of an injury, follow the Pressure Do not use metal tools to clean the air cap or spray Relief Procedure on page 11 whenever you stop nozzle holes as this could scratch them, and make spraying and whenever you are instructed to sure the electrode wire is not damaged. Scratches in relieve the pressure. the air cap or spray nozzle or a damaged electrode wire can distort the spray pattern.
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Troubleshooting WARNING WARNING ELECTRIC SHOCK HAZARD PRESSURIZED EQUIPMENT HAZARD Installing and servicing this equipment To reduce the risk of an injury, follow the Pressure requires access to parts which may Relief Procedure on page 11 before checking or cause an electric shock or other serious servicing any part of the system and whenever you injury if the work is not performed properly. Do not are instructed to relieve the pressure. install or service this equipment unless you are trained a
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Troubleshooting Gun Operation Troubleshooting Problem Cause Solution The needle packings or shaft are worn. Replace the packings or shaft; see page Fluid leakage from the fluid packing area 26. The packing nut is loose Tighten the packing nut; see page 26. Air leakage from the front of the gun The air valve is not seating properly. Clean and service the air valve; see page 31. The air valve o-ring is sticking. Lubricate the o-ring; see page 31. Fluid leakage from the front of the gun The needle
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Troubleshooting Electrical Troubleshooting Problem Cause Solution Poor wrap-around The ES ON-OFF lever is in the OFF (O) Turn the lever to ON (1). position.* The distance between the gun and work- Adjust the spraying distance to 8 to 12 inches piece is incorrect. (203 to 305 mm) The parts are poorly grounded. Clean the workpiece hangers. Check for proper grounding on the conveyer or track. The booth exhaust velocity is too high. Reduce exhaust velocity within code limits. The atomizing air press
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Electrical Tests The performance and safety of the spray gun are Measure the resistance between the end of the elec- directly affected by the condition of the electrical trode (20) and the gun air fitting (17). See Fig. 7. The components contained inside the gun. The electrical resistance should be between 180 to 220 megohms. If tests below can be used to determine the condition of the resistance is outside the specified range, go to the the power supply (18) and the resistor stud (22) as well
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Electrical Tests A Test Power Supply Resistance Remove the power cartridge (18) from the gun handle. See Power Cartridge Replacement on page 27. Remove the turbine alternator from the power car- tridge. See Turbine Alternator Removal on page 28. Measure the resistance from the power supply’s ground contact point (EE) to the contact spring (18c) on the other end of the power supply. See Fig. 8. The resistance should be 157.5 to 192.5 megohms. If the resistance is outside the specified range, the
