ESAB Precision Plasmarc EPP-600, Instruction Manual, Page: 52 / 90

52
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
0558038308
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
0558038308
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
0558038308
High remote current signal Decrease remote current signal
Faulty PCB1 Replace PCB1 P/N 0558038287
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 flow 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 flow.
Excessive dirt restricting cooling 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).
Obstructed air intake
Check and clear any obstructions from the
bottom, front, and top rear of the Power
Source.