ESAB Plasmarc EPP-450 - Troubleshooting; General Troubleshooting Guidelines; Fault Indicators Overview

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SECTION 6 TROUBLESHOOTING
6.1 General
ELECTRIC SHOCK CAN KILL!
DO NOT PERMIT UNTRAINED PERSONS TO INSPECT OR REPAIR THIS
EQUIPMENT. ELECTRICAL WORK MUST BE PERFORMED BY AN EXPE
RIENCED ELECTRICIAN.
WARNING
Stop work immediately if power source does not work properly.
Have only trained personnel investigate the cause.
Use only recommended replacement parts.
CAUTION
6.2 Fault Indicators
FaultindicatorsarefoundonthefrontpanelUsedwith
theLEDsonPCB1(locatedbehindthecoverwiththe
EPPlabel)problemscanbediagnosed.
NOTE:
Itisnormalformomentarylight-
ing(ashing)ofthefaultindicator
andLED3whena“contactoron”
signalisappliedatthebeginning
ofeachcutstart.
FaultIndicatorusedwith:
LED3-BusRipple
LED4-HighBus
LED5-LowBus
LED7-ArcVoltageSaturation
LED8-ArcVoltageCuto
PowerResetFaultIndicatorusedwith:
LED6-RightOvercurrent
LED9-LeftOvercurrent
LED10-LeftIGBTUnsaturated
LED11-RightIGBTUnsaturated
LED12-Left-12VBiasSupply
LED13-Right-12VBiasSupply
PCB1 Located behind
thispanel.
Front Panel Fault
Indicators