ESAB 35609, Installation, Operation And Maintenance Manual

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SECTION 6 Troubleshooting
ESP 400C and 600C Plasma Power Sources 6-8
Problem Possible Cause Action
LED 12 – (red) Left –12V
Missing Loose or unplugged P1 connector at
the left PWM/Drive PCB
Loose or unplugged P10 connector
at PCB1
Faulty left PWM/Drive PCB Secure P1 connector
Secure P10 connector
Replace left PWM/Drive PCB P/N
38030
LED 12 – (red) Right –12V
Missing Loose or unplugged P1 connector at
the right PWM/Drive PCB
Loose or unplugged P11 connector
at PCB1
Faulty right PWM/Drive PCB Secure P1 connector
Secure P11 connector
Replace right PWM/Drive PCB P/N
38030
Very high Output current
accompanied by either a left or
right over current (LED 6) Shorted IGBT
Current pot set too high
Faulty left PWM/Drive PCB
High remote current signal
Faulty PCB1 Replace the pair of IGBTs containing
the shorted IGBT
Lower the current setting
Replace left PWM/Drive PCB
Decrease remote current signal
Replace PCB1 P/N 38032
Over Temp Lamp illuminates One or more fans inoperable
Broken wire or unplugged connector
at thermal switch.
Obstruction to air flow closer than 2
feet to rear of power source.
Excessive dirt restricting cooling air
flow
Obstructed air intake Repair or replace fan(s)
Repair broken wires and unplugged
connector
Allow 2 ft. minimum between the rear
of the power source and any object
that may restrict air flow.
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 filter
inductors (L1 and L2).
Check and clear any obstructions
from the bottom, front, and top rear
of the Power Source.