Cebora PLASMA PROF 162 - Irregular Pilot Arc Starts, Unstable Pilot Arc

CEBORA S.p.A. 18
3.302.002 03/08/00
Correct?
Correct?
Correct?
TORCH BOARD INPUT VOLTAGE TEST.
q Torch board (68), connector J5 terminals AB and connector J7 terminal 1= > 200 VDC.
NO
YES
♦ Check the wiring between connectors J6 on board (68) and J7 on board (15).
♦ Replace board (68).
NOZZLE REMOTE SWITCH TEST.
q Remote switch coil terminals (18) = 27 VAC.
NO
YES
♦ Check the wiring between the resistor (74), remote switch contacts (18) and
connector J5 terminals AB on board (68). If you find loose connections, tighten
and replace any damaged components.
♦ Check the connection between the choke (43) and connector J7, terminal 1, on
board (68).
♦ Check the jumpers on power contacts of remote switch (18).
♦ Check the resistor (74); replace if broken.
♦ Replace remote switch (18).
♦ Check the wiring between the remote switch (18) and connector J12 on board (62).
♦ Replace board (62).
3.3.8 - Irregular pilot arc starts, unstable pilot arc.
NOTE
Some of the following tests may be checked only during the pilot arc time (max. 2 seconds).
PLASMA GAS PRESSURE TEST.
q Gas pressure in the plasma chamber of the correct torch.
YES
NO
♦ Make sure that the pressure regulator (H) and pressure gauge (G) are working
properly; replace if defective.
♦ Make sure that the gas pressure, on the pressure gauge (G), corresponds to the
value indicated in table (S) of the operator panel (see fig. 3.2.1.).
♦ Check solenoid valve (29), EL1 or EL2, for pilot arc = open; solenoid valve (29),
EL3, for transferred arc = closed. If not correct, check efficiency of solenoid
valves, wiring between solenoid valves and connector J12 of board (62), or
replace board (62) (see “Pilot arc solenoid valve test” par.3.3.5).
♦ Check presence of flow reducers on solenoid valves (29) EL1 and EL2.