Alarm Signals; Yellow (G) And Red (N) Leds Lit = Temperature Outside Limits; Red Leds (L) And (N) Lit = Low Gas Pressure - Cebora POWER PLASMA 3100 Service Manual

CEBORA S.p.A.

3.4 - Alarm signals.

3.4.1 - Yellow (G) and red (N) leds lit = temperature outside limits.

The power source delivers no current, but the fan continues running; we therefore recommend
leaving the power source powered to ensure rapid cooling.
This is reset automatically when the temperature returns within the allowed limits.
THERMOSTAT TEST.
Panel board (31), connector CN1, terminals 2 (+) - 3 (-) = 0 Vdc, contact closed, appropriate
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temperature (approximately +10 Vdc, contact open, temperature outside limits).
♦ Check the wiring between CN1 panel board (31) and the thermostat, located on
the dissipater of the power mosfet on the power board (35).
♦ Replace the thermostat or power board (35).
♦ Replace panel board (31).
♦ Make sure that the fan (15) is working properly (see par. 3.3.2).
♦ Make sure that air is flowing properly and that the aeration tunnel contains no dust or other
obstacles to cooling.
♦ Make sure that the working conditions comply with the specified values, especially observing
the "duty cycle".
♦ Replace panel (31) and/or power (35) boards.

3.4.2 - Red leds (L) and (N) lit = low gas pressure.

The power source delivers no current, but remains powered.
This is automatically reset when the pressure returns within the allowed limits, but to re-start
the pilot arc you must give a new start command from the torch button.
PRESSURE SWITCH (32) TEST.
Panel board (31), connector CN1, terminals 1 (+) - 4 (-) = 0 Vdc, contact closed, pressure OK
q
(+10 Vdc, contact open, pressure low).
♦ Check the wiring between CN1 panel board (31) and pressure switch (32).
♦ Make sure that gas is present at the intake fitting (B) and that the pressure in the
supply line meets specifications (see Instructions Manual).
♦ Make sure that the pressure regulator (E) and pressure gauge (F) are working
properly; replace if defective.
♦ Make sure there are no occlusions in the gas hoses of the power source.
♦ Replace the pressure switch (32).
♦ Replace panel board (31).
♦ Replace panel board (31).
3.302.089
Correct?
YES
Correct?
YES
NO
NO
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31/05/02