ESAB POWERCUT-1500 Manuel D'instructions page 189

SECTION 5
F. High Frequency and Pilot Arc are on but Main Arc does not
transfer.
1. Make sure work clamp is connected to work material.
2. Check the torch. Replace consumables if necessary.
G. Poor Cutting Performance.
1. Check air supply regulator . It should be adjusted to 80 psig.
2. The air supplied to the torch should be free of oil and water.
3. Make sure the consumables in the torch are acceptable.
4. Check open circuit voltage. See E.3 above.
5. Check the output. Use a calibrated current probe capable of
measuring 100 amps in the presence of high frequency.
H. Air does not shut off.
1. Check air test, the gas solenoid valve is energized when the switch is
in the "on" position.
2. Does air flow stop when the torch switch is unplugged? If yes, check
and repair the torch. If not, send unit to an Authorized Repair Station
for repair.
a. Check voltage to solenoid coil, if present when torch switch is
unplugged, replace PCB1. If voltage is "0", replace solenoid valve.
I. Main arc is difficult to start.
1. The most common reason is worn or missing consumables. Check
and replace if necessary.
2. Input air must be clean and dry.
3. Input air pressure must be 80 psig.
4. Torch connections must be tight.
5. Work cable and clamp must be in good condition and must make a
good electrical connection to the material to be cut.
6. If above items check OK , the problem is internal. Send unit to an
Authorized Repair Station for repair.
a. Missing or weak pilot arc.
voltage and pilot arc wiring.
b. Inoperative Start-up Board (PCB-6).
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TROUBLESHOOTING
Check pilot arc fuse, open circuit