Fault Isolation (Diagnostics); Power Not On Or Low Voltage - ESAB ESP-400C Installation, Operation And Maintenance Manual

SECTION 6
6.3 Fault Isolation
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
6-4
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
ESP 400C and 600C Plasma Power Sources
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
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 38032)
Troubleshooting
Action
Action