Graco EcoQuip EQ200T - Page 24

Troubleshooting
Problem Problem
Problem
Cause Cause
Cause
Solution Solution
Solution
Themainairregulatorisstuck
open.
SeeRepairingtheMainAirRegulator,page
27.
Theblastcontroltubingisnot
connectedproperly.
Ensureairtubingisroutedandconnected
properly.SeeHoseSchematic,page42.
Electricblastcontrolcircuitis
malfunctioning.
Inspecthosecablefordamagedorshorted
wiring.Checkbatteryandcontrolpanel
connections.EnsureDCpowersourceis
12V.Check3Afuseinsidecontrolpaneland
replaceitifnecessary.Checkcurrent󰘱owin
circuit,ifcurrentexists,replacerelay.
Theblastcontrolisnot
engagedbutblastingstill
occurs.
Pneumaticblastcontrolcircuitis
malfunctioning.
SeePneumaticBlastControlCircuit,page26.
Incorrectabrasiveisbeingused.
Usethecorrectabrasive.See
AbrasiveMeteringValveSettings,page16.
Thepotdoesnothavea
suf󰘰cientamountofabrasive.
Re󰘰llthepotwithabrasive.See
Re󰘰llingthePotwithAbrasive,page18.
Thepotpressuresettingis
incorrect.
Performthepressurereliefprocedure(see
PressureReliefProcedure,page8)
andresetpotpressure(see
SettingUptheEquipment,page11).
TheAuto-Ventvalvedoesnot
ventairwhenthepotis󰘰lled.
MakesuretheAuto-Ventvalveisworking.
PerformtheAuto-Ventcleaningprocedure
(seeCleaningtheAuto-VentValve,page30).
Thediaphragmvalveis
malfunctioning.
Performthediaphragm󰘱ushprocedure(see
FlushingtheDiaphragmValve,page28).
If󰘱ushingdoesnotsolveproblem,see
RepairingtheDiaphragmValve,page29.
Theblastspraypattern
isirregular.
Thereisblockageinsidethe
potorinsidetheabrasivehose
betweenthepotandthepanel.
Makesuretheballvalveisclosed,then
disconnectthecam-lockcoupler.Openthe
abrasiveballvalveslightlyandmakesure
abrasiveis󰘱owingfromtheabrasivehose.
Ifnot,followtheshutdownprocedure(see
ShuttingDown,page19).Thoroughly󰘱ush
thepotandthemediahoseafterdraining
mediaandwater.
Theunitisnotonalevelsurface.Placetheunitonalevelsurface.Ifthisis
impossible,theAuto-Ventmustbeonthe
highersideoftheunit.
Theinitialpotpressureisnotset
correctly.
Con󰘰rmthattheauto-ventvalveisworking
andsetinitialpotpressure30psi(2.0bar,
0.20MPa)abovetheblastpressure.
TheAuto-Ventismalfunctioning.Performauto-ventcleaningprocedure(see
CleaningtheAuto-VentValve,page30).
Astronghoserecoil
occursfrequentlywhen
theblastcontrolswitch
isengaged.
Thediaphragmneedstobe
󰘱ushed.
Performthediaphragm󰘱ushprocedure(see
FlushingtheDiaphragmValve,page28).
If󰘱ushingdoesnotsolvetheproblem,see
RepairingtheDiaphragmValve,page29.
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