ESAB Plasmarc EPP-450 - Torch Will Not Fire

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SECTION 6 TROUBLESHOOTING
6.3.6 Torch Will Not Fire
Problem Possible Cause Action
MainArcTransferstotheworkwith a
short“pop”,placingonlyasmalldimple
inthework.
Remote control removes the start
signalwhen the mainarctransfersto
thework.
Panel/Remoteswitchin“Remote”with
noremotecontrolofthecurrent
Place Panel/Remote switch in “Panel”
position
Remote current control present but
signalmissing.
CheckforcurrentreferencesignalatTB1-
4(+)andTB1-5(-).SeeSignalvs.Output
CurrentCurvethissection.
Currentpotsettoolow. Increasecurrentpotsetting.
Start current pot, located behind the
cover for the control PCB is set too
low.
Increasethestartcurrentpostsetting
to“7”.
Arcdoesnotstart.Thereisnoarcatthe
torch.OpencircuitvoltageisOK.
Openconnectionbetweenthepower
sourcepositiveoutputandthework.
Repairconnection
FuseF6inthePilotarccircuitisblown. ReplaceF6
FuseF7inthepilotarccircuitisblown. ReplaceF7
PilotarcHigh/Lowswitchisinthe”LOW”
positionwhenusingconsumablesfor
100Aorhigher(Refertoprocessdata
includedintorchmanuals)
Change Pilot arc to “High” position.
(Refertoprocessdataincludedintorch
manuals)
Pilotarccontactor(K4)faulty. ReplaceK4
FaultyPCB1
ReplacePCB1P/N
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