ESAB Plasmarc EPP-450 - Page 43

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SECTION 6 TROUBLESHOOTING
Problem Possible Cause Action
VeryhighOutputcurrentac-
companiedbyeitheraleftor
rightovercurrent(LED6)
ShortedIGBT ReplacetheIGBTs
Currentpotsettoohigh Lowerthecurrentsetting
FaultyleftPWM/DrivePCB ReplaceleftPWM/DrivePCB
Highremotecurrentsignal Decreaseremotecurrentsignal
FaultyPCB1 ReplacePCB1P/N0558038312
LED10-(red)LeftIGBTUn-
saturated
BlackwireconnectingIGBT(Q2)collectortoP3ofthe
leftPWM/DrivePCB(PCB2)isdisconnected.
Secureconnector
ShortedFreewheelingDiode(s) Replacefreewheelingdiode(s)
LooseorunpluggedP1connectorattheleftPWM/
DrivePCB
SecureP1
LooseorunpluggedP10connectoratPCB1 SecureP10
FaultyPCB1 ReplacePCB1P/N0558038312
FaultyleftPWM/DrivePCB ReplacePCB2P/N0558038324
LED 11 - (red)  Right IGBT
Unsaturated
BlackwireconnectingIGBT(Q5)collectortoP3ofthe
rightPWM/DrivePCB(PCB3)isdisconnected.
Secureconnector
ShortedFreewheelingDiode(s) Replacefreewheelingdiode(s)
LooseorunpluggedP1connectorattheleftPWM/
DrivePCB
SecureP1
LooseorunpluggedP10connectoratPCB1 SecureP11
FaultyPCB1 ReplacePCB1P/N0558038312
FaultyrightPWM/DrivePCB ReplacePCB3P/N0558038324