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section 6
6.4 fault isolation
6.4.1 fans not working
problem
All 3 fans do not run
1 or 2 fans do not run.
6.4.2 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.
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
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
Remote current control present but
signal missing.
Current pot set too low.
Open connection between the power
source positive output and the work.
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)
Faulty PCB1
None
Repair wire.
Replace fans
Place Panel/Remote switch in "Panel"
position
Check for current reference signal
between J and L on 24 pin receptacle -
should be between 0.5 - 10 volts
(5.55 volts = 200 amps)
Increase current pot setting.
Repair connection
Increase pilot current. (Refer to process
data included in torch manuals)
Replace PCB1
31
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