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SYMPTOM CHECK
The arc starts but sputters badly. 1. Check the torch consumables to be sure they
are tight, not dirty or greasy and in good shape.
Replace if necessary.
2. Check air supply for oil or a great deal of water.
If there is oil or a great deal of water, the air
must be filtered or the machine switched to
nitrogen or bottled air.
3. Check the air pressure. The pressure must be
60 psi (413 kPa) minimum while air is flowing.
The "Air Pressure" LED must be lit.
The “THERMAL” LED is lit. The “FAULT” 1. The machine is overheated. Allow it to cool and
LED is blinking. reset. The air intakes of the machine must not
be blocked, or this will become a nuisance.
The “FAULT” LED is lit 1. The Fault circuit monitors the torch to see if it is
shorted as well as internal machine failures.
2. Check the torch consumables to see if they are
melted together or are simply touching each
other. Tighten, clean or replace. See
“Suggestion for Extra Utility from the PRO-CUT
System”.
3. Check the torch cab le to see if it is cut or
punctured. Replace.
4. Turn off the machine and turn it back on. If the
“FAULT” LED will not stay off when you try to
cut again and there is no problem with the torch,
then something has failed in the machine and
the machine should not be left on.
4a) Check electrode to pilot for short.
4b) Check air flow.
4c) Check the power board. During preflow,
there should be no voltage between work and
electrode and at end of preflow open circuit
voltage should be present. Replace if bad.
5. Replace control PC board.
Alternating “AIR/FAULT” LED lights. 1. Replace control PC board.
The “OUTPUT ON” and “FAULT” LED’s 1. The pilot arc duty cycle has been exceeded.
blink in alternating order. The machine will cool down and the lights will
quit blinking in about 20 seconds. The pilot arc
is limited to 20 out of 80 seconds except in
special circumstances such as cutting
expanded metal. (See the section on expanded
metal in the Operating Section.)
Airflow will not shut off. 1. Check harness 1J7 (C2) and 3J7 (H6).