CEBORA S.p.A. 15
3.3.8 - Irregular pilot arc starts, unstable pilot arc.
PLASMA GAS PRESSURE TEST.
Correct?
Gas pressure correct in the plasma chamber of the torch.
YES
NO
♦ Check for the presence of gas at the intake fitting (B) and make sure that the
pressure and flow rate in the intake line meet specifications.
♦ Make sure that the threaded part of the fitting (B) inserted in the pressure
regulator (E) is no more than 6 - 8 mm (1/4” - 5/16”) long, to avoid any possible
malfunction of the regulator (E).
♦ Make sure that the pressure regulator (E) and pressure gauge (F) are working
properly.
♦ Make sure there are no occlusions in the gas hoses of the power source.
♦ Make sure that solenoid valve EL1 (34) = open, and solenoid valve EL2 (34) =
closed, during the pilot arc.
♦ Make sure the power source open circuit working condition, performing if necessary tests in
par. 3.3.7.
♦ Check the wiring between TP8 on HF-filter board (47), resistor (37) and nozzle terminal of
torch cable; between TP7 on HF-filter board (47) and HF transformer (31) secondary
winding; between TP3 on HF-filter board (47) and power source output terminal (21);
between TP5 on HF-filter board (47) and ground. If you find loose connections, tighten and
replace any components with damaged terminals.
♦ Check integrity of resistor (59). Correct value = 50 ohm.
♦ Make sure the internal parts of the torch are properly isolated, including the cables, and if in
doubt replace the entire torch.
♦ Check the electrode, swirl ring and torch nozzle; replace if worn or damaged.
♦ Replace HF-filter board (47).
3.302.173 28/07/04
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