Transfer Arc Does Not Take Place, Pilot Arc Remains And Cutting Is Impossible - Cebora PLASMA PROF 162 Service Manual

CEBORA S.p.A.

3.3.9 - Transfer arc does not take place, pilot arc remains and cutting is impossible.

REED TEST.
Board (62), connector J8, terminals 1 – 2 = 0 VDC (reed contact closed) with pilot arc lit and
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torch next to workpiece.
♦ Check the wiring between connector J8 on board (62) and reed (14).
♦ Make sure the reed is correctly positioned inside the coil (13).
♦ Check the coil connections (13); if you find loose or damaged connections,
tighten or replace the damaged components.
♦ Replace reed (14).
♦ Replace board (62).
TRANSFER ARC REFERENCE TEST.
Board (9), connector J3, terminals 1 – 2 = fig. 5.2.3. (transfer arc current set-point), with
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knob (Z) turned to mid-point. Waveform of the transfer arc current set-point, with duty-cycle
variable according to rotation of the knob (Z).
♦ Check the wiring between connectors J3 on board (9) and J2 on board (62).
♦ Check the wiring between connectors J1 on operator panel (64) and J11 on board
(62).
♦ Replace the operator panel (64).
♦ Replace board (62).
TRANSFER ARC SOLENOID VALVE TEST.
Solenoid valve terminals (29), EL3 (terminals 3 – 4 of J12 control board (62) = 27 VAC,
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with transfer arc and torch next to workpiece.
♦ Check the wiring between connector J12 on board (62) and solenoid valve
terminals (29) EL3.
♦ Replace board (62).
♦ Make sure there are no occlusions in the gas hoses of the solenoid valve EL3.
♦ Check pressure and gas flow when solenoid valve (29) EL3 is powered.
♦ Replace solenoid valve EL3.
3.302.002
Correct?
YES
NO
Correct?
YES
NO
Correct?
YES
NO
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03/08/00