ESAB Plasmarc EPP-450 - Power Reset Fault Indicator; LED 6: Right Overcurrent Fault Diagnosis; LED 9: Left Overcurrent Fault Diagnosis; LED 10: Left IGBT Unsaturated Fault Diagnosis

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SECTION 6 TROUBLESHOOTING
PowerResetFaultIndicator(onfrontpanel)
Illuminateswhenaseriousfaultisdetected.Inputpowermustbedisconnectedfora
least5secondstoclearthisfault.CheckPCB1RedLEDs6,9,10,11,12,and13ifthis
faultisilluminatedforfurtherdiagnosis.
LED6–(red)RightOvercurrentFault–Illuminateswhenthecurrentoutoftheright
sidechopperistoohigh(300amps).Thiscurrentismeasuredbytheright-sidehall
sensor.Thepowersourceisshutdown.
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LED9–(red)LeftOvercurrentFault–Illuminateswhenthecurrentfromtheleftside
chopperistoohigh(300amps).Measuredbythelefthallsensor.Powersourceis
shutdown.
LED10_(red)LeftIGBTUnsaturatedFault–IlluminateswhenleftIGBTisnotfully
conducting.PS(PS)isshutdown.
LED11 –(red) RightIGBTUnsaturatedFault–Illuminates
whenrightIGBTisnotfullyconducting.PowerSource(PS)
isshutdown.
LED12–(red)Left-(neg)12VBiasSupplyFault–Illuminates
whennegative12V bias supply to the leftsideIGBTgate
drivecircuit(locatedonPWM-driveboardPCB2)ismissing.
PSisshutdown.
LED13–(red)Right–(neg)12VBiasSupplyFault-Illuminateswhennegative12Vbias
supplytotherightsideIGBTgatedrivecircuit(locatedonPWMdriveboardPCB3)is
missing.PSisshutdown.