Arc Is Difficult To Strike, The Arc Shuts Off Immediately After Striking; Welding Quality Is Not Satisfactory, The Wire Speed Is Not Suited To The Output Current - Cebora 305 Manual De Servicio

− if necessary rotate knob B to select 2T;
− press knob B for a time longer than 2 s to exit the
Service Functions menu and save the selections;
− rotate knob B to select the maximum output current
(180 A).
□ Output terminals C and D on power source = values as
shown in the table, with start button pressed.
NO
♦ Regular operation.
INVERTER POWER SUPPLY TEST.
□ Power board (34), R32 SHUNT(-) terminal (in proxim-
ity of inductor L3) and dissipater DISS2(+), voltage =
+395 Vdc approximately, with power source on resis-
tive load, in the table conditions (Vdc on DC-capaci-
tors, with boost converter working and power source
on resistive load).
EN
YES
♦ Perform tests of par. 3.2.1 with particular care
to the POWER SUPPLY TEST concerning
the boost converter and the precharge circuits
operation.
♦ Replace power board (34).
■ Check the wiring between terminals VITE1 and
VITE2 on power board (34), polarity reverser and
power source output terminals C and D. If you find
loose connections, tighten and replace any damaged
components.
■ Check the wiring between J7 power board (34) and J1
panel board (19).
■ Check correct fixing and connections cleaning of the
INV board on power board (34) J4 connector.
■ Check condition of the inverter power components
(U8 ÷ U13, D13, D14, etc.) on power board (34).
■ Replace power (34) and/or panel (19) boards.
26
Correct?
YES
Correct?
NO
3.2.9 Arc is difficult to strike, the arc shuts off im-
mediately after striking.
3.2.10 Welding quality is not satisfactory, the wire
speed is not suited to the output current.
"Soft Start" and "Inductance" functions, available in the
Service Functions menu (see Instructions Manual), can
assist welding start.
The parameters entered in the programs (synergic curves)
are determined based on experience, thus some operators
may find conditions to be optimal while others may need
to make slight changes.
For this reason the operators have the option of changing
the ratio between wire speed and welding current (see
Instructions Manual).
In the situation where there are problems striking the arc
or welding difficulties despite careful management of the
available parameters on the control panel, we recommend:
− make sure the parameters selected reflect the actual
current welding conditions;
− make sure the adjustments are working properly, by car-
rying out welding tests with different parameter settings
or switching the working program with a similar one, if
available, to determine the practical welding differences
with the different settings. If changes of the parameters
do not correspond to welding differences or if you en-
counter problems in selecting the parameters, upgrade
the power source firmware to the last version available
on the Cebora Web site (see par. 2.4);
− make sure the power source is working properly, per-
forming if necessary the "open circuit operation" tests
in par. 3.2.7 and "operation on resistive load" tests in
par. 3.2.8;
− check the compatibility of the components being used
(torch, type of contact tip, wire type and diameter, type
of gas, etc.) with the type of welding being carried out;
− check the wear status of the torch and its components,
replacing them if necessary.
3302327/A