Alarms Shown During Pilot Arc Or Transfer Arc (Cutting) Operation - Cebora POWER PLASMA 3100 Service Manual

CEBORA S.p.A.
- Start button pressed during the reset from stop due to temperature outside limits or low gas
pressure.
The alarms for high temperature and for low gas pressure cause the power source to stop, and
the leds (G) or (L) light together with led (N) on the control panel, but they are not saved. They
are automatically reset when the pressure and temperature return to within the allowed limits.
It may occur that the reset takes place when the start command is present, thus to prevent the
power source from starting suddenly because of a random reset, this will only cause the leds (G),
(L) and (N) to shut off, but the power source will continue to not deliver current.
To restore proper operation, and thus strike the pilot arc, remove and reapply the start
command to the power source.
- Contact of the reed bulb SW1 on HF board (22) = closed during power source start-up.
If the reed contact SW1 on HF board (22) is found closed, at the start-up, with correct power
source supply voltage, the power source remains blocked, without delivering current and with
the red led (N) lit.
To analyse the problem, perform the following test:
REED TEST.
Panel board (31), connector CN2, terminals 8 (+) and 3 (-) = +13 Vdc, with power source
q
powered, (0 Vdc, contact closed, with transfer arc, thus while cutting).
♦ Check the wiring between CN2 panel board (31) and J1 HF board (22).
♦ Make sure the reed bulb SW1 is properly mounted in the solenoid provided on HF
board (22).
♦ Make sure that, with power source off, the switch in the reed bulb SW1 works
properly: place a magnet near the bulb and check the resistance between the
terminals 8 and 3 of J1 on HF board (22) = 0 ohm (reed contact closed). Move the
magnet away from the bulb, resistance = approximately 1 Kohm (reed contact
open). If incorrect replace the reed bulb and solenoid.
♦ Replace the HF board (22) and/o panel board (31).
♦ Correct operation.

3.4.5 - Alarms shown during pilot arc or transfer arc (cutting) operation.

- Short-circuit between electrode and nozzle.
A short-circuit or heavy loss of insulation between the electrode and torch nozzle terminals
may interfere with proper striking of the pilot arc.
This situation is detected and blocks the power source with led (N) lit.
To solve this problem, we recommend:
− Check electrode and torch nozzle; replace if worn or damaged.
− Make sure the internal parts of the torch are properly insulated, including cables; if in
doubt, replace the entire torch.
− Check the wiring between the torch cable and the corresponding terminals on the HF board
(22).
− Replace the HF (22) and/or panel (31) and/or power (35) boards.
3.302.089
Correct?
YES
NO
21
31/05/02