Graco Inc 3500WB, 308584, 222700 manual Electrical Troubleshooting, Problem, Cause, Solution, cedure

Page 24

Troubleshooting

Voltage Loss Troubleshooting (continued)

11.A dielectric breakdown is most likely in one of the following three areas. Repair or replace the com- ponent that is failing.

D Fluid hose

DFluid packings

Remove the packing assembly from the gun as instructed on page 33, and look for signs of fluid leakage or any blackened areas, which would indicate arcing is occurring along the packing rod.

DFluid hose connection joint to the spray gun

Check for leakage or any bulges in the outer jacket, which may indicate a pin-hole leak through the PTFE layer. Disconnect the fluid hose from the gun, and look for signs of fluid contamination on the outside of the PTFE portion of the fluid tube.

Inspect the end of the hose connected to the voltage block. Look for cuts or nicks.

Make sure the hose is properly stripped; see Fig. 4, page 12, for hose stripping dimensions. Restrip or replace the hose.

A breakdown at the fluid hose connection joint would be caused by fluid leaking past the o-ring seals on the end of the hose. Remove the hose at the gun connection and look for signs of fluid leakage along the PTFE tube.

12.Before reassembling the gun, clean and dry the gun fluid inlet tube (item 75 on page 46). Repack the inner spacer of the fluid packing rod with dielectric grease and reassemble the gun as instructed on page 34.

13.Reconnect the fluid hose as instructed on page 12.

14.Check the gun voltage with the voltage probe and meter before filling the gun with fluid.

Electrical Troubleshooting

Problem

Cause

Solution

 

 

 

Voltage is still present at the gun

Gun electrostatics (gun ES lever) are

Turn off the gun electrostatics.

after following the Fluid Voltage

not turned off.

 

Discharge and Grounding Pro-

 

 

cedure

 

 

 

 

 

 

Did not wait long enough for the volt-

Wait a longer period of time before

 

age to discharge through the voltage

touching the electrode with a

 

bleed resistor.

grounded rod. Check for possible

 

 

bleed resistor failure.

 

 

 

 

There is an air pocket in the fluid line

Determine the cause of the air pocket

 

that leaves the fluid near the gun

and fix the problem. Purge the air out

 

isolated.

of the fluid line.

 

 

 

 

Voltage isolation system failed.

See the isolation system manual for

 

 

service information.

 

 

 

The operator gets a shock

The operator is not properly grounded

Be sure the floor and the operator are

 

or is near an ungrounded object.

properly grounded; see Ground the

 

 

System, page 14.

 

 

 

 

The gun is not properly grounded.

See Check the Electrical Ground-

 

 

ing, page 15.

The operator gets a shock when

The workpiece is not properly

Clean the workpiece hangers; check

touching the workpiece

grounded.

for proper grounding on the conveyor

 

 

or track

 

 

 

24 308584

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Contents INSTRUCTIONS-PARTS LIST 308584100 psi 0.7 MPa, 7 bar Maximum Working Pressure Part No. 222700, Series CTable of Contents SymbolsWarning Symbol Caution SymbolELECTRIC SHOCK HAZARD FIRE AND EXPLOSION HAZARD PRESSURIZED EQUIPMENT HAZARDWarnings are continued on the next page EQUIPMENT MISUSE HAZARD TOXIC FLUID HAZARDIntroduction Spraying Waterborne Fluids ElectrostaticallyOperating the Electrostatics Refer to Fig. 1, pageB A C Graco Waterborne Fluid Hose purchased separately D Inner Hose Layer EE is a PTFE tubeD Conductive Hose Layer DD covers the PTFE tube H2O PRO Voltage Block connection shownInstallation Installing the SystemVentilate the Spray Booth Warning SignsConsult your isolation system manual for other configurations PRO 3500wb Gun shown with the Graco H2O PRO Batch SystemT S N K L M G F NH R B A E D P CInstall the Air Line Accessories Install the Fluid LIne AccessoriesConnect the Air Line Connect the Exhaust TubeFilter the Fluid Connect the Fluid HoseContinued on the next page Connect the Fluid Hose continued H2O PRO Voltage Blockconnection shown Ground the System FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARDCheck the Electrical Grounding Fluid Voltage Discharge and Grounding Procedure Pressure Relief ProcedureOperation Operating Checklist Selecting a Fluid Nozzle and Air CapOperating the Spray Gun FIRE AND EXPLOSION HAZARDCOMPONENT RUPTURE HAZARD Atomizing Air Valve Adjustment Fine Adjustments of the Spray GunMaintenance Daily Care and CleaningShutdown Clean the Air Cap and Fluid Nozzle ProcedureFlush the Spray Gun Equipment neededTroubleshooting Voltage Loss TroubleshootingSpray Gun Waterborne Fluid HoseVoltage Loss Troubleshooting continued TestsElectrical Troubleshooting ProblemSolution CauseSpray Pattern Troubleshooting Poor Electrostatic Wrap Troubleshooting Gun Operation TroubleshootingGun Operation Troubleshooting continued Electrical Tests Test Gun ResistanceTest Power Supply Resistance Test Resistor Stud ResistanceService Prepare the Gun for ServiceAir Cap/Nozzle/Resistor Stud Replacement Tools Included with the GunAir Cap/Nozzle/Resistor Stud Replacement continued InstallationElectrode Needle Replacement Preventative Maintenance If installing the complete fluid rod assembly, go to step 11, pageFluid Packing Rod Removal and Repair WhereFluid Packing Rod Removal and Repair continued Fan Air Adjustment Valve Repair Fluid Adjustment Assembly RepairIf installing the complete valve, go to step DETAILFluid Adjustment Assembly Repair continued Air Trigger Valve Repair Apply a very light coat of lubricant to the o-rings 41 Atomizing Air Valve Repair ES ON-OFF Valve Repair MOVING PARTS HAZARD05363B Barrel Removal Power Supply Replacement  Apply a very light coat of lubricant to the o-rings 37a Do not expose the gasket 18a to solvents Turbine Alternator Replacement Barrel Installation05158B Graco Waterborne Fluid Hose Repair Measurements, inches mmPRO 3500SC Gun Disassembly NOTE Keep all the following parts for reassemblyPRO 3500sc Gun Conversion Installing the Fluid Needle Assembly 10. Tighten the nut 78* onto the ferrule housing Spray Gun Parts See Detail AEQUIPMENT MISUSE HAZARD Part No. 222700, Series C Model PRO 3500wb Spray GunY Replacement Warning signs are available at no cost DescriptionAccessories Use Only Genuine Graco Parts and AccessoriesWaterborne Fluid Hose Assembly 100 psi 0.7 MPa, 7 bar Maximum Working PressureFor use in the Fluid Voltage Discharge and Ground- ing Procedure Manual Change SummarySnap Ring Pliers Gun High Voltage Probe & MeterPage Technical Data CategoryData The Graco Warranty and Disclaimers Graco Phone NumberWARRANTY EQUIPMENT NOT COVERED BY GRACO WARRANTY
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