No Gas Flows From The Torch; Gas Flows From The Torch, The Pilot Arc Does Not Light (High Frequency Missing) - Cebora PLASMA PROF 80 Service Manual

CEBORA S.p.A.

3.3.4 - No gas flows from the torch.

PILOT ARC SOLENOID VALVE EL1 (37) TEST.
Solenoid valve EL1 (37) terminals = approximately 26 Vac, with torch button pressed. The
solenoid valve opening time also depends on the post-gas time.
♦ Check the wiring between solenoid valve EL1 (37) and terminals 5 and 11 of J5
on control board (9).
♦ With power source off, check the resistance between the terminals of solenoid
valve EL1 (37) = approximately 25 ohm. If 0 ohm (short-circuit), replace solenoid
valve EL1 (37) and control board (9).
♦ Check on control board (9), connector J5 terminals 6 and 12, voltage =
approximately 27 Vac, with power source powered. If incorrect, with the power
source off temporarily disconnect connector J5 from control board (9) and make
sure resistance on the terminals of J5 of control board (9) = >2 Kohm. If correct
check the wiring between J5 of control board (9) and J2 of fuse board (18), and
perform the SERVICES POWER SUPPLY TEST in par. 3.3.1 if necessary. If
incorrect, replace control board (9).
♦ Perform the CONTROL BOARD (9) POWER SUPPLY TEST, par. 3.3.1.
♦ Replace control board (9).
♦ With power source off, check the resistance between the terminals of solenoid valve EL1 (37)
= approximately 25 ohm. If >Mohm (winding broken) replace solenoid valve EL1 (37).
♦ Make sure there are no occlusions in the gas hoses of the power source.
♦ Check the presence of the gas at the inlet fitting (B) and that the pressure and flow rate in the
intake conduit meet the specification values (see Instruction Manual).
♦ Make sure that the pressure regulator (E) and pressure gauge (F) are working properly.
♦ Make sure that the threaded part of the air 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).
♦ Replace solenoid valve EL1 (37).

3.3.5 - Gas flows from the torch, the pilot arc does not light (high frequency missing).

HF BOARD (25) POWER SUPPLY TEST.
HF board (25), connector J1, terminals 1 and 2 = approximately 192 Vac, with power source
powered.
♦ Check the wiring between J1 HF board (25) and terminals J4-J5 power board (20).
♦ Check on the power board (20), terminals TP1 and TP6 voltage = approximately
22 Vac, and terminals TP2 and TP1 voltage = approximately 170 Vac, with power
3.302.167
Correct?
YES
Correct?
YES
NO
NO
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25/06/04