Torch Will Not Fire - ESAB ESP-600C Installation, Operation And Maintenance Manual

SECTION 6

6.3.4 Torch Will Not Fire

Problem
Main Arc Transfers to the work
with a short "pop", placing only a
small dimple in the work.
Arc does not start. There is no
arc at the torch. Open circuit
voltage is OK at 400 –460V
Possible Cause
Panel/Remote switch in "Remote"
with no remote control of the
current
Remote current control present
but signal missing.
Current pot set too low.
Start current pot, located behind
the cover for the control PCB is
set too low.
Open connection between the
power source positive output and
the work.
Fuse F6 in the Pilot arc circuit is
blown.
Fuse F7 in the pilot arc circuit is
blown.
Pilot arc High/Low switch is in the
"LOW" position when using
consumables for 100A or higher
(Refer to process data included in
torch manuals)
Pilot arc contactor (K4) faulty.
Faulty PCB1
ESP 400C and 600C Plasma Power Sources
Troubleshooting
Action
Place Panel/Remote switch in
"Panel" position
Check for current reference signal
at TB1-4(+) and TB1-5(-). See
Signal vs. Output Current Curve
this section.
Increase current pot setting.
Increase the start current post
setting to "7".
Repair connection
Replace F6
Replace F7
Change Pilot arc to "High"
position. (Refer to process data
included in torch manuals)
Replace K4
Replace PCB1 P/N 38032
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