ESAB Plasmarc EPP-450 - Power Not On or Low Voltage; Fault Light Illumination

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6.3.4 Power Not On or LOW Voltage
Problem Possible Cause Action
Powersourceinoperable:
Mainpowerlampiso.
Missing3-phaseinputvoltage
Restoreall 3 phases of input voltage to within
±10%ofnominalline.
Missing1of3-phaseinputvoltage
Restoreall 3 phases of input voltage to within
±10%ofnominalline.
Lowopencircuitvoltage
FuseF3/F4blown ReplaceF3/F4
PilotarcContactor(K4)faulty ReplaceK4
FaultyControlPCB1 ReplaceControlPCB1(P/N 0558038312 )

Problem Possible Cause Action
Faultlightilluminatesattheendof
cutbutgoesoatthestartofthe
next.
Normalconditioncausedwhenter-
minatingthearcbyrunningthetorch
otheworkorthearcbeingattached
toapartthatfallsaway.
Reprogramcuttingprocessto
ensurearcisterminatedonlyby
removingthe“ContactorOn”signal.
LED3–(amber)BusRipple
Imbalanceof3-phaseinputpower
Maintainphasevoltageimbalance
oflessthan5%.
Momentary loss of one phase of
inputpower
Restoreandmaintaininputpower
within±10%nominal
FaultycontrolPCB1 ReplacePCB1P/N 0558038312
LED4–(amber)HighBus
Oneormorephasesofinputvoltage
exceednominallinevoltagebymore
than15%.
Restoreandmaintainlinevoltage
within±10%
FaultycontrolPCB1 ReplacePCB1P/N 0558038312
Oneormoreshorteddioderectiers
(D25-D28)onthe“ElectrodePlate”
Replaceshorteddioderectiers
LED5–(amber)LowBus
One or more phases of input volt-
agearelowerthannominalbymore
than15%.
Restoreandmaintainwithin
±10%ofnominal
BlownF1andF2fuses
SeeF1andF2inBlown
FusesSection
OvertempLightcomeson. SeeovertempinFaultLightSection
Imbalanced3-phaseinput
power
Maintainphasevoltageimbalance
oflessthan5%
Momentary loss of one phase of
inputpower
Restoreandmaintainwithin
±10%ofnominal
FaultyMainContactor(K1) ReplaceK1
FAULTYControlPCB1 ReplacePCB1P/N 0558038312
SECTION 6 TROUBLESHOOTING
6.3.5 Fault Light Illumination