ESAB Plasmarc EPP-450 - Page 44

44
SECTION 6 TROUBLESHOOTING
Problem Possible Cause Action
LED12–(red)Left–12VMissing
LooseorunpluggedP1connectorat
theleftPWM/DrivePCB
SecureP1connector
Loose or unplugged P10 connector
atPCB1
SecureP10connector
FaultyleftPWM/DrivePCB
Replace left PWM / Drive PCB  P/N
0558038324
LED12–(red)Right–12VMissing
LooseorunpluggedP1connectorat
therightPWM/DrivePCB
SecureP1connector
Loose or unplugged P11 connector
atPCB1
SecureP11connector
FaultyrightPWM/DrivePCB
Replace right PWM / Drive PCB  P/N
0558038324
VeryhighOutputcurrentaccompa-
niedbyeitheraleftorrightovercur-
rent(LED9orLED6respectively)
ShortedIGBT ReplacetheIGBTs
Currentpotsettoohigh Lowerthecurrentsetting
FaultyleftPWM/DrivePCB
Replace left PWM / Drive PCB P/N
0558038324
Highremotecurrentsignal Decreaseremotecurrentsignal
FaultyPCB1 ReplacePCB1P/N0558038312
OverTempLampilluminates
Oneormorefansinoperable Repairorreplacefan(s)
Brokenwireorunpluggedconnector
atthermalswitch.
Repair broken wires and unpluggedcon-
nector
Obstructiontoairowcloserthan3feet
(1m)torearofpowersource.
Allow3ft.(1m)minimumbetweentherear
ofthepowersourceandanyobjectthatmay
restrictairow.
Excessive dirt restricting cooling air
ow
Cleanoutexcessivedirt,especially in the
extrusionsfortheIGBTsandfreewheeling
diodes,thePOS,NEGandElectrodePlates,
the main transformer (T1) and the lter
inductors(L1andL2).
Obstructedairintake
Checkandclearanyobstructionsfromthe
bottom, front, and top rear of the Power
Source.