Graco EcoQuip 2 - Page 28

Troubleshooting
Problem Problem
Problem
Cause Cause
Cause
Solution Solution
Solution
Thesupplyairpressureis
󰘱uctuating
Makesurethecompressormeetsminimum󰘱ow
requirementsandisoperatingproperly.See
TechnicalSpeci󰘰cations,page67formoreinformationon
󰘱owrequirements.
Themainairregulatoris
malfunctioningorisstuck
open.
Disassemblethemainairregulatorandcheckfor
obstructions.Replaceorrepairpartsasnecessary(see
EnclosureBoxParts,page50).
Theelectricblastcontrol
circuitismalfunctioning.
Inspectthehosecablefordamagedorshortedpartially
openwiring.Checkthe3Afuseandreplaceifnecessary.
Checkforloosewireconnectionsontherecessedplugson
thecontrolbox(P)andallexternalcables.Checkcontinuity
throughtheelectricblastcontrolswitch(B)(theswitchis
normallyopen).Ifallaboveitemsarefunctional,replacethe
4-waysolenoidvalve.
Whiletheblastcontrol
switch(B)isengaged,
theblastair󰘱owis
󰘱uctuating.
Thepneumaticblastcontrol
circuitismalfunctioning.
Actuatetheblastcontrolswitch(B)andcheckforproperspool
valveactuationinthe4-wayvalve.Ifnoactuationoccurs,
checktheblastcontrolswitchbydisconnectingtheyellow
tubeattheenclosuremalequickdisconnectandengagethe
controlswitch.Ifonlyalittleaircomesfromthe󰘰tting,check
thetwin-linehosefordamageorcrimpingandcheckthe
pneumaticblastcontrol󰘰lter.Ifthetwin-lineand󰘰lterare
clean,replacethepneumaticblastcontrolswitch.Iftheswitch
isfunctioning,makesuretheyellowtubinginsidethecontrol
boxisproperlyconnectedandclearanyobstructions.Ifall
aboveitemsarefunctional,replacethe4-waysolenoidvalve.
Theairsupplyisinadequate.
Makesuretheaircompressoriscapableofsupplying
theminimumair󰘱owrequirementforyoursystem(see
TechnicalSpeci󰘰cations,page67).Makesuretheairinlet
pressuregaugereads100-175psi(6.8–12bar,0.68–1.2
MPa).Ifthegaugedoesnotread100–175psi,checktheair
compressorforpropersetup.Makesuretheairinlet󰘰lters
arecleanandreplaceifnecessary.
Theblasthosewasnot
properlycleanedoutafter
previoususe.
SeeShuttingDown,page21.
Theabrasivemeteringvalve
settingistoohighfortheblast
pressureand/orabrasive
type.
SeeSettingtheAbrasiveMeteringValve,page17.
Thepotdoesnothavea
suf󰘰cientamountofabrasive.
Re󰘰llthepotwithabrasive(see
Re󰘰llingthePotwithAbrasive,page21).
Thereisanobstructioninthe
nozzle
Removethenozzleandinspectforblockage,buildup,or
damage.Replaceifnecessary.
Theblastspray
patternissputtering
orirregular.
Thereisanobstructioninside
thepotorinsidetheabrasive
hosebetweenthepotandthe
enclosure.
PerformDrainingthePot,page22,followedby
PressureReliefProcedure,page10.Withtheabrasive
hosedisconnected,inspecttheinteriorofthepinchhose
forobstructionsordebrisandreplaceifnecessary(see
ReplacingthePinchHose,page32).Removethetri-clamp
fromthebottomofpot.Inspectthebottomofthepotand
abrasivehoseforobstructionsordebris.
Thereisnotenoughwaterin
abrasivemixture.
SeeUsingtheWaterDoseMeter,page24(anupgradekitis
availablefornon-Elitemodels).
Theblastpressuretoohigh.Decreasetheblastpressureandre-evaluatethedustlevels.
Toomuchdustoccurs
duringblasting.
Theabrasiveistoo󰘰neforthe
application.
Tryacoarserorharderabrasiveifpossible.
28 3A3489E