Fault Isolation - ESAB EPP-400 Manuel D'instructions

section 6

6.3 fault isolation

Many of the most common problems are listed by symptom.
6.3.1 Fans not working
6.3.2 Power not on
6.3.3 Fault Light Illumination
6.3.4 Torch won't fire
6.3.5 Fusses Blown F1 and F2
6.3.6 Intermittent, Interrupted or Partial Operation
6.3.1 fans not working
problem
All three fans do not run
One or two fans do not run.
6.3.2 power not on or low voltage
problem
Power source inoperable:
Main power lamp is off.
Low open circuit voltage
possible cause
This is normal when not cutting.
Fans run only when "Contactor On"
signal is received.
Broken or disconnected wire in fan
motor circuit.
Faulty fan(s)
possible cause
Missing 3-phase input voltage
Missing 1 of 3-phase input voltage
Fuse F3 blown
Pilot arc Contactor (K4) faulty
Faulty Control PCB1
None
Repair wire.
Replace fans
Restore all 3 phases of input voltage to within
±10% of nominal line.
Restore all 3 phases of input voltage to within
±10% of nominal line.
Replace F3
Replace K4
Replace Control PCB1 (P/N 0558038287)
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