ESAB ESP 600C Instalación Funcionamiento Y Mantenimiento página 54

SECTION 6
Problem
LED 12 – (red) Left –12V
Missing
LED 12 – (red) Right –12V
Missing
Very high Output current
accompanied by either a left or
right over current (LED 6)
Over Temp Lamp illuminates
6-8
Possible Cause
Loose or unplugged P1 connector at
the left PWM/Drive PCB
Loose or unplugged P10 connector
at PCB1
Faulty left PWM/Drive PCB
Loose or unplugged P1 connector at
the right PWM/Drive PCB
Loose or unplugged P11 connector
at PCB1
Faulty right PWM/Drive PCB
Shorted IGBT
Current pot set too high
Faulty left PWM/Drive PCB
High remote current signal
Faulty PCB1
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
ESP 400C and 600C Plasma Power Sources
Troubleshooting
Action
Secure P1 connector
Secure P10 connector
Replace left PWM/Drive PCB P/N
38030
Secure P1 connector
Secure P11 connector
Replace right PWM/Drive PCB P/N
38030
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
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.