Graco Inc 247937, 247936, 312900C Electrical Tests, Test Gun Resistance, Test Total Gun Resistance

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Electrical Tests

Electrical components inside the gun affect performance and safety. The following procedures test the condition of the power supply (18), barrel (16) and charging probe (31), and electrical continuity between components.

Use megohmmeter Part No. 241079 (AA) and an applied voltage of 500 V. Connect the leads as shown.

Electrical Tests

Test Gun Resistance

Measure resistance between the air swivel (35) and the charging probe socket (CC) (see FIG. 9); it should be

70-95 megohms. If outside this range, check the power supply and barrel resistance. If in range, test the charg- ing probe resistance.

Fire, Explosion, and Electric Shock Hazard

Megohmmeter Part No. 241079 (AA-see FIG. 8. through FIG. 12.) is not approved for use in a hazard- ous areas. To reduce the risk of sparking, do not use the megohmmeter to check electrical grounding unless:

•The gun has been removed from the hazardous area;

or

•all spraying devices in the hazardous area are turned off, ventilation fans in the hazardous area are operating, and there are no flammable vapors in the area (such as open solvent containers or fumes

from spraying).

Failure to follow this warning could cause fire, explo- sion, and electric shock and result in serious injury and property damage.

Test Total Gun Resistance

Measure resistance between the charging probe tip

(BB)and the air swivel (35) (see FIG. 8.); it should be 90-130 megohms. If outside this range, go to the next test. If in range, refer to Gun Repair on page 27 for other possible causes of poor performance.

AA

BB

35

ti1468ax

Fig. 8. Test Total Gun Resistance

 

AA

35

CC

 

 

ti13731

FIG. 9. Test Gun Resistance

Test Charging Probe Resistance

Measure resistance between the metal spring in the charging probe (DD) and the charging probe tip (BB) (see FIG. 9); it should be 15-30 megohms. If outside this range, replace the charging probe. If in range, inspect the spring and barrel socket for possible causes of poor continuity. Reassemble the charging probe and retest the gun resistance.

AA

BB

DD

ti13732

FIG. 10. Test Charging Probe Resistance

312900C

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Contents II 2 G EEx 0.24 mJ PRO Xs Waterborne Air Spray GunTable of Contents FIRE, EXPLOSION, and Electric Shock Hazard Equipment Misuse Hazard Standard Model 247936 OverviewHow the Electrostatic Air Spray Gun Works Smart Model 247937Air swivel inlet. Left-hand thread Fan air adjustment valve. Adjusts fan size ES indicator 247936 only. Green when ES is on Ventilate the Spray Booth InstallationInstall the System Typical Installation Key Grounded Air Supply Hose Connect the Air LineConnect the Charging Probe Filter the Fluid Connect the Exhaust TubeConnect the Fluid Line Orifice Size Select a Fluid Nozzle and Air CapFire, Explosion, and Electric Shock Hazard GroundingCheck Fluid Resistivity Check Electrical GroundingPrepare to Paint Check Fluid ViscosityTurn ES ON/OFF switch on Flush Pressurized Equipment Hazard Pressure ReliefShutdown Clean Gun Daily MaintenanceDaily System Care See Check Electrical Grounding on Electrical TroubleshootingElectric Shock Hazard See Test Total Gun Resistance onTest Charging Probe Resistance Electrical TestsTest Gun Resistance Test Total Gun ResistanceTest Barrel Resistance Test Power Supply ResistanceSpray Pattern Troubleshooting Gun Operation Troubleshooting Prepare the Gun for Repair Gun RepairReplace Fluid Needle Replace Air Cap/NozzleRemove Fluid Packing Remove Fluid PackingPacking Rod Repair Packing RodRemove Barrel Install BarrelPower Supply Remove and Replace Power SupplyRemove and Replace Turbine Alternator Repair Fan Air Adjustment ValveRepair Air Valve Repair Fluid Adjustment ValveRepair ES ON/OFF Valve Remove and Replace Atomizing Air Restrictor ValveRef. No Multi-tool PartsPart No 60 kV Electrostatic Gun, Series a Standard model Part No 60 kV Electrostatic Gun, Series a Smart model Smart Model controls Ref. No Alternator Ref. No Fan Adjustment ValveRef. No Packing Rod Ref. No ES ON/OFF ValveDescription Qty Description Qty Fluid Line Accessories AccessoriesAir Line Accessories Miscellaneous Accessories Gun AccessoriesCategory Data Technical DataGraco Information Graco Warranty
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