Cebora 1753, Instruction Manual

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9
• Keep the welding cables, electrode clamp and earth clamp
in good condition.
• Periodically clean the interior of the machine. Blow away
the accumulated dust with a light blast of dry air.
6 OPERATING ERRORS
1 - DEFECT The machine does not turn on.
CAUSES • Machine is not plugged in.
• Missing power supply phase.
2 - DEFECT The machine turns on but does not output
current.
CAUSES • Welding accessories not connected.
• Machine not connected to the proper
supply voltage.
3 - DEFECT The line fuses burn out
CAUSES • Insufficient installed power.
• Machine not connected to the proper
supply voltage.
• Power transformer short-circuited.
• Rectifier short-circuited.
4 - DEFECT Welding current unstable or incorrect.
CAUSES • Primary and/or secondary circuit connec-
tions incorrect.
• Unsuitable electrode.
• Welding cables not fastened to the termi-
nals or poor contacts in the joints.
• Machine not connected to the proper
supply voltage.
5 - DEFECT The fan does not turn but the welding cur-
rent is correct.
CAUSES • Fan motor defective.
• Motor power lines broken.
• Fan protection fuse burnt.
6.1 REPAIRING THE WELDING MACHINES
Experience has shown that many accidents arise from
improper repairs. That is why it is just as important to fully
check a repaired welding machine as a new one.
This also protects manufacturers from being held liable for
defects for which others are to blame.
6.1.1 Rules to observe for repairs.
After rewinding the transformer or chokes, the welding
machine must pass the applied voltage tests described in
table 2 of paragraph 6.1.3 of the standard EN 60974.1 (CEI
26.13). Compliance must be verified as specified in para-
graph 6.1.3 of EN 60974.1 (CEI 26.13).
If no rewinding has been carried out, a welding machine that
has been cleaned and/or refurbished must pass an applied
voltage test with test voltage values at 50% of those given
in table 2 of 6.1.3.
Compliance must be verified as specified in 6.1.3.
After rewinding and/or replacing parts, the open-circuit vol-
tage must not exceed the values listed in 10.1 of EN
60974.1.
If the repairs are not performed by the manufacturer, repai-
red welding machine in which any components have been
replaced or altered must be marked in such a way as to
identify who carried out the repairs.
6.1.2 Repair tips.
After making a repair, make sure to rearrange the wiring so
that there is secure isolation between the primary and
secondary sides of the machine. Do not allow wires to come
into contact with moving parts or those that heat up during
operation. Also re-mount all of the clamps as they were on
the original machine, to prevent an accidental connection
between the primary and secondary circuits if a conductor
should break or disconnect.
Should it be necessary to replace the front support of the
welding machine, make sure it is fastened in place with the
screws of the transformer.