Graco EcoQuip 2 EQm - Page 26

Troubleshooting
Problem Problem
Problem
Cause Cause
Cause
Solution Solution
Solution
Thewaterpressureregulator
ismalfunctioning.
Adjustthewaterpressureregulatorto185psi(12.75bar,
1.275MPa).Ifthisadjustmentisnotpossible,servicethe
waterpressureregulator(seemanual309474).
Thepotpressurerelief
valveisdischarging
water.
Thepressurereliefvalvehas
failed.
Replacethepressurereliefvalveifweepingoccursator
below185psi(12.75bar,1.275MPa).
Theadjustableblastregulator
isnotadjustedtothecorrect
pressure.
Adjusttheblastregulatortothedesiredpressurewhilethe
blastcontrolisengaged.
Thetubingtothemainair
regulatorisnotproperly
connectedorthereareair
leaksinthe󰘰ttingsortubing.
SeetheTubingSchematic,page63.Checkforleaksat
connectionpoints.
Theadjustableblastair
regulatorismalfunctioning.
Cleanorreplacetheadjustableblastairregulator.
Noblastair󰘱owwhen
theblastcontrolswitch
(B)isengaged.The
waterpumpdoescycle
whiletheblastcontrol
switchisengaged.
Themainairregulatoris
malfunctioning.
Disassemblethemainairregulatorandinspect
components.Replaceorrepairpartsasnecessary.See
EnclosureBoxParts,page50.
Theemergencystop(Q)is
engaged.
Disengagetheemergencystop(Q).
Theairsupplyisinadequate.
Makesuretheaircompressoriscapableofsupplying
theminimumair󰘱owrequirementforyoursystem(see
TechnicalSpeci󰘰cations,page67formoreinformation).
Makesuretheairinletpressuregaugereads100-175psi
(6.8–12bar,0.68–1.2MPa).Ifthegaugedoesnotread
100–175psi,checktheaircompressorforpropersetup.
Theelectricblastcontrol
circuitismalfunctioning.
Ensureproper12VDCsupplyisconnected,andatfull
charge.Inspectcablefordamagedor'open'wiring.Check3A
fuseandreplaceifnecessary.Checkforcontinuitythrough
connectorsonthecontrolboxandallexternalcables.Check
continuitythroughtheelectricblastcontrolswitch(B)(the
switchisnormallyopen).Ifallaboveitemsarefunctional,
replacethe4-waysolenoidvalve.
Noblastair󰘱owwhen
theblastcontrolswitch
(B)isengaged.The
waterpumpdoes
notcyclewhilethe
blastcontrolswitchis
engaged.
Thepneumaticblastcontrol
circuitismalfunctioning.
Actuatetheblastcontrolswitch(B)andcheckforproperspool
valveactuationinthe4-wayvalve.Ifnoactuationoccurs,
checktheblastcontrolswitchandtwin-linebydisconnecting
theyellowtubeattheenclosuremalequickdisconnectand
engagethecontrolswitch.Ifnoaircomesfromthe󰘰tting,
checkthepneumaticblastcontrol󰘰lter.Ifthe󰘰lterisclean,
checkforsignalairattheblastcontrolswitch.Replacethe
pneumaticblastcontrolswitchifsignalairdoesnotpass
throughthevalvewhenthehandleisdepressed.Iftheswitch
isfunctioning,makesuretheyellowtubinginsidethecontrol
boxisproperlyconnectedandisclearofobstructions.Ifthe
tubingisclean,replacethe4-waysolenoidvalve.
26 3A3489E