Cebora 965, Service Manual, Page: 18 / 24

CEBORA S.p.A.
18
3.4.4 - Lamp (L) (45) lit, with fix light = low gas pressure.
With this alarm the power source remains in block with contactor TLP (30) opened, without
output voltage.
This is automatically reset when the pressure returns within the allowed limits, but to restart
pilot arc you need a new start command by torch start button.
To analyze the problem perform the following test.
PRESSURE SWITCH (33) TEST.
‰
Control board (6), connector J3, terminals 3 and 5 (NC contact) = 0 Vac, contact closed, with
low pressure (<3.2 bar); 24 Vac, contact opened, with suitable pressure.
Correct?
‰
Control board (6), connector J3, terminals 3 and 4 (NO contact) = 24 Vac, contact opened,
with low pressure (<3.2 bar); 0 Vac, contact closed, with suitable pressure.
YES
NO
♦
Check the wiring between pressure switch (33) and terminals 3, 4 and 5 on control
board (6).
♦
Check for the presence of gas at the intake fitting (B) and make sure the pressure
and flow rate in the intake line meet specifications (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).
♦
Make sure there are no occlusions in the gas hoses of the power source.
♦
Replace the pressure switch (33).
♦
Replace control board (6).
♦
Proper operation of the pressure switch (33).
♦
Replace control board (6).
3.302.173 28/07/04