Cebora PLASMA PROF 162 - Gas Flows from the Torch, the Pilot Arc Does Not Light (High Frequency Missing)

CEBORA S.p.A. 17
3.302.002 03/08/00
Correct?
Correct?
Correct?
3.3.7 - Gas flows from the torch, the pilot arc does not light (high frequency missing).
NOTE
The following tests may be checked only in the two seconds after pressing the torch start button
(maximum pilot arc time).
VOLTAGE PRESENCE TEST AT IGBT OUTPUT.
q Terminals 1 – 3 of IGBT (72) = > 200 VDC.
YES
NO
♦ Go to par. 3.3.6.
HF OSCILLATOR TEST.
q HF board (15), scintillator SC2 discharges at regular intervals.
NO
YES
♦ Make sure that there is no short-circuit between connectors J8 and J9 on board
(15) or in the wiring of the primary HF transformer circuit (69).
♦ Check the secondary HF transformer circuit connections (69), choke (43) and
fixed fitting (50). If you find loose connections, tighten and replace any damaged
components.
♦ Check the adapter and torch cable; replace if aged or cracked.
♦ Check electrode and torch nozzle; replace if worn or damaged.
♦ Check distance between tips of the scintillator SC2 (correct = 0.95 mm.).
♦ Make sure that the gas pressure in the torch plasma chamber is not too high (see
“Plasma gas pressure test”, par. 3.3.8.).
♦ Replace HF transformer (69).
♦ Replace board (15).
HF BOARD INPUT VOLTAGE TEST.
q HF board (15), connector J7, terminals 1 – 4 = > 200 VDC.
NO
YES
♦ Make sure that the connection between J8 and J9 on board (15) and the primary
HF transformer circuit (69) is not broken.
♦ Check 0 VAC on terminals A - B of J3 on board (15), in normal configuration; 27
VAC if HV-16 module is installed (also see Service Manual for HV-16 Module).
♦ Replace board (62).
♦ Replace board (15).