ESAB EPP-400 - Fault Isolation

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SECTION 6 TROUBLESHOOTING
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 re
6.3.5 Fusses Blown F1 and F2
6.3.6 Intermittent, Interrupted or Partial Operation
6.3.1 Fans Not Working
Problem Possible Cause Action
All 4 fans do not run
This is normal when not cutting.
Fans run only when “Contactor On”
signal is received.
None
1, 2 or 3 fans do not run.
Broken or disconnected wire in fan
motor circuit.
Repair wire.
Faulty fan(s) Replace fans
6.3.2 Power Not On or LOW Voltage
Problem Possible Cause Action
Power source inoperable:
Main power lamp is o.
Missing 3-phase input voltage
Restore all 3 phases of input voltage to within
±10% of nominal line.
Missing 1 of 3-phase input voltage
Restore all 3 phases of input voltage to within
±10% of nominal line.
Low open circuit voltage
Fuse F3 blown Replace F3
Pilot arc Contactor (K4) faulty Replace K4
Faulty Control PCB1 Replace Control PCB1 (P/N 0558038287 )