Graco EcoQuip EQ200T - Page 23

Troubleshooting
Problem Problem
Problem
Cause Cause
Cause
Solution Solution
Solution
Thepotdoesnothavea
suf󰘰cientamountofabrasive.
SeeRe󰘰llingthePotwithAbrasive,page18.
Thesystemisnotproperlyset
up.
SeeSettingUptheEquipment,page11.
Makesurethepotpressureisproperlyset.
Thepotpressuremustbeset30psi(2bar,
0.2MPa)abovetheblastpressure.Make
suretheselectorvalveissettoBLAST.
Theabrasiveballvalvemustbeopen.The
abrasivemeteringvalvemustbeatleast1/8
turnopen.
Thereisanobstructioninthe
mediacircuit.
SeeFlushingtheDiaphragmValve,page28.
Thediaphragmvalveisnot
working.
SeeRepairingtheDiaphragmValve,page29.
Noabrasive󰘱owsfrom
thenozzleduringblast
mode.
Thereisblockageinsidethe
potorinsidetheabrasivehose
betweenthepotandthepanel.
Makesuretheballvalveisclosed,then
disconnectthecam-lockcoupler.Openthe
abrasiveballvalveslightlyandmakesure
abrasiveis󰘱owingfromtheabrasivehose.
Ifnot,followtheshutdownprocedure(see
ShuttingDown,page19).Thoroughly󰘱ush
thepotandthemediahoseafterdraining
mediaandwater.
Theblastregulatorisnot
adjustedtothecorrectpressure.
Adjusttheblastregulatortothedesired
pressurewhiletheblastcontrolisengaged.
Thetubingtothemainair
regulatorisnotproperly
connected.
Con󰘰rmthatthetubingfromtheblast
regulatortothemainairregulatorisintact.
SeeHoseSchematic,page42.
Theblastairregulatoris
malfunctioning.
Replacetheblastairregulator.
Noblastair󰘱owwhen
theblastcontrolis
engaged.Thewater
pumpcycleswhilethe
blastcontrolengaged.
Themainairregulatoris
malfunctioning.
SeeRepairingtheMainAirRegulator,page
27.
Theairsupplyisinadequate.Makesuretheairinletpressuregaugereads
100-125psi(6.8–8.6bar,0.68–0.86MPa).If
thegaugedoesnotread100–125psi,check
theaircompressorforpropersetup.
TheEmergencyStopis
engaged.
DisengagetheEmergencyStop.
Theelectricblastcontrolcircuit
ismalfunctioning.
Inspectthehosecablefordamagedorshorted
wiring.Checkthebatteryandcontrolpanel
connections.MakesuretheDCpowersource
is12V.Checkthe3Afuseinsidethecontrol
panel,andreplaceitifnecessary.Checkthe
current󰘱owinthecircuit.Ifcurrentexists,
replacetherelay.
Noblastair󰘱owwhenthe
blastcontrolisengaged.
Thewaterpumpdoes does
does
not not
not
cyclewhiletheblast
controlengaged.
Thepneumaticblastcontrol
circuitismalfunctioning.
SeePneumaticBlastControlCircuit,page26.
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