© ESAB AB 2010
-37-
bp12a3
10.3 Fault Isolation
10.3.1 Fans not working
Problems Possible cause Action
All 3 fans do not run
This is normal when not cutting.
Fans run only when “Contactor
On” signal is received.
None
1 or 2 fans do not run. Broken or disconnected wire in
fan motor circuit
Repair wire.
Faulty fan(s) Replace fans
10.3.2 Torch will no t fire
Problems Possible cause Action
Main Arc Transfers to the work
with a short “pop”, placing only
a small dimple in the work.
Remote control removes the
start signal when the main arc
transfers to the work.
Panel/Remote switch in
“Remote” with no remote
control of the current
Place Panel/Remote switch in
“Panel” position
Remote current control present
but signal missing.
Check for current reference
signal between J and L on 24
pin receptacle - should be
between 0.5 - 10 volts (10 volts
= 360 amps)
Current pot set too low. Increase current pot setting.
Arc does not start. There is no
arc at the torch. Open circuit
voltage is OK.
Open connection between the
power source positive output
and the work.
Repair connection
Pilot current and/or start current
should be increased for better
starts when using consumables
for 100A or higher (Refer to
process data included in torch
manuals)
Increase pilot current. (Refer to
process data included in torch
manuals)
Faulty PCB1 Replace PCB1
US
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