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in perfect condition; be careful with the tips, which flex: near
the connection terminals, earth clamps and gun input.
Keep the welding current connectors to sockets F and G
clean and firmly tightened (see Fig. 1)
The terminals for connecting to the base metal must make
good contact to avoid overheating, sparks, uneven current
circulation, damage to the components where the pins are
welded, and welding of uneven quality.
Prevent dirt, dust and filings from getting into the welding
machine.
Always make sure the cooling air circulates freely.
Make sure that the fan functions properly.
Make sure that the clamps hold the stud bolts firmly, with all
contact springs.
The clamp chuck must slide freely throughout its length,
without changes due to friction or foreign matter.
7.2 SPECIAL
Only qualified personnel should perform maintenance.
Some functional errors are highlighted by the appearance of
an error code on the display E.
Error
Malfunction
code
E 1
Thermostat trippedl
E 2
SCR short-circuited
E 2
Connectors not
inserted correctly
E 3
Irregular voltage
at the capacitor tips
E 4
Irregular
capacitor charging
E 5
Irregular
capacitor discharging
Wait at least 5 minutes after shutting off the switch I before
opening the welding machine, and unplug the plug from the
power socket.
Use a volt meter to make sure that the capacitors are dis-
charged.
Carefully remove any dust, metal fragments and filings from
the machine using compressed air to avoid damaging or
projecting metal fragments onto the electronic or electrical
parts.
Make sure that all connectors are fully inserted.
Make sure that all welding circuit terminals are firmly tight-
ened.
After making a repair, make sure to rearrange the wiring so
that there is secure insulation between the primary and sec-
ondary sides of the machine. Do not allow wires to come into
contact with moving parts or those that heat up during oper-
ation. Reassemble all of the clamps as they were on the orig-
inal machine, to prevent an accidental connection between
the primary and secondary circuits if a conductor should
break or disconnect.
Also remount the screws with geared washers as on the
original equipment.
Solution
Wait a few minutes
Contact technical
service
Insert the
connector
Contact technical
lservice
Contact technical
lservice
Contact technical
service
11
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