Nordson cp Product Manual

Contents

Troubleshooting5-6Part 104373−03 2015 Nordson CorporationCorrective ActionPossible CauseProblem8. Fluid pressure dropswhen the spraydevices are triggeredInsufficient air supply Refer to Specifications in theDescription section for air pressurerequirements.Heavy viscous coating materialcausing inadequate flow rateAn inadequate flow rate can becaused by attempting to siphon aheavy viscous coating material.Correct by pressure feeding thecoating material. Pressure shouldnot exceed 13.8 bar (20 psi).Partially blocked fluid hoses orfluid filter screenThe fluid hoses may be partiallyblocked. Clean the fluid filter screen,if necessary. Flush the fluid lines.9. Fading or narrowingof the spray patternafter the spray deviceis triggeredInadequate air supply Refer to Specifications in theDescription section for air pressurerequirements. The air supply hosemust have at least a 13-mm( 1/2-in.) ID.Clogged fluid filter screen Clean the fluid filter screen.10. Spray device nozzlepluggingFluid filter screen size too large orscreen damagedMake sure the filter screen is theproper size for your coating material.Check the filter screen for damage.Refer to the filter manual.Contaminants in the fluid hoses Check the hoses. Cured coatingmaterials may be breaking away fromthe inner hose wall and plugging thenozzle.11. Tails appearing in aspray pattern that wasnormalInadequate circulation rateallowing coating material to cool atthe spray deviceIncrease the circulation rate byopening the circulation valve.Contact your Nordson representativefor help in determining the propercirculation rate for your system.NOTE: Tails are streamsof unatomized coatingmaterial at the outer edgesof the spray patternBlocked fluid filter screen Clean the fluid filter screen. Refer tothe filter manual.Change in coating materialviscosityCheck for a change of viscosity. Ifnecessary, add solvent to thematerial, or change to a newmaterial.Inadequate fluid pressure Increase the fluid pressure.12. Temperature dropsafter spray devicesare triggeredInadequate heater capacity Make sure the heater capacity isadequate and that the heaters arefunctioning correctly. Refer to theheater manual.Changes to the system One of these changes could causethe problem: Switching to larger flow-ratenozzles. Adding spray devices to thesystem.