Cebora SPOT 3500 Service Manual download pdf (Page 14)

CEBORA S.p.A. 14

3.302.047 21/12/00

Correct?

3.3.5 - In actual working conditions (thus with high currents), the welding quality is not

satisfactory.

NOTE

In actual working conditions, thus with high currents, the welding quality may not be satisfactory

even if the “no-load operating test” par. 3.3.3 and “resistive load operating test” par. 3.3.4 were

successful.

To check whether the problem is due to the power source or the accessories connected to it

(cables, gun, tools, or sheet metal), we recommend repeating the resistive load tests in par. 3.3.4

with a resistive load capable of circulating high currents, around max. 3500 Aac.

These conditions must not be maintained for long, but must observe the power source duty

cycle (2800 Aac, at 5%).

WORK QUALITY TEST AT HIGH CURRENTS.

q Power source on resistive load with current of approximately 2800 Aac = voltage and

waveform values similar to those of the table in par. 3.3.4, (keep in mind that in these

conditions the power source at full load and the power mains, subjected to this load,

condition the output voltage, thus the waveforms may differ slightly, especially in amplitude,

from those in the table fig.).

YES

♦ Perform the “open circuit operation” test (par. 3.3.3) and “operation on resistive

load” (par. 3.3.4).

♦ With power source powered, check voltage on CN2 of control board (27),

terminals 3 – 2 (gnd) = fig. 5.2.6 during the current output time, with start button

pressed, (+12 Vdc, with start button released). If incorrect, check the status and

proper assembly of the current transducer (28). If in doubt, replace.

♦ Check the connections between the secondary transformer circuit (26) and output

terminals of the power source. If you find loose or burnt connections, clean

thoroughly and tighten, or replace any damaged terminals or components.

♦ Replace static switch (14).

♦ Replace control board (27).

♦ Power source operating correctly.

♦ Check the condition of the gun cables and earth clamp. Restore or replace if aged or fittings

damaged.

♦ Check conditions of the gun and tools in use. Replace if necessary.

♦ Check the conditions of the sheet metal being used. To achieve good results, follow the

guidelines provided in the Instruction Manual.

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Cebora SPOT 3500 Service Manual Page 14