CEA CONVEX 4000 vision Operator's Manual page 16

7) When you have finished welding remember to shut the
valve on the gas cylinder.
Table 5 shows the currents to use with the respective elec-
trodes for TIG DC welding. This input is not absolute but is for
your guidance only; read the electrode manufacturers' instruc-
tions for a specific choice. The diameter of the electrode to use
is directly proportional to the current being used for welding.
Maintenance
ATTENTION: Cut off the power supply to the equipment be-
fore effecting any internal inspection.
CONVEX 4000-5000 vision
IMPORTANT: For fully electronic welding machines, remov-
ing the dust by sucking it into the machine by the fans, is of ut-
most importance.
In order to achieve correct functioning of the machine, pro-
ceed as described:
• Periodic removal of accumulations of dirt and dust inside the
equipment using compressed air. Do not point the jet of air
directly at the electrical parts as this could damage them.
• Periodical inspection for worn cables or loose connections
that could cause overheating.
TORCH
The torch is subjected to high temperatures and is also stressed
by traction and torsion. We recommend not to twist the wire and
not to use the torch to pull the welder. As a result of the above
the torch will require frequent maintenance such as:
• Cleaning welding splashes from the gas diffuser so that the
gas flows freely.
• Substitution of the contact point when the hole is deformed.
• Cleaning of the wire guide liner using trichloroethylene or
specific solvents.
• Check of the insulation and connections of the power cable;
the connections must be in good electrical and mechanical
condition.
SPARE PARTS
Original spares have been specifically designed for our equip-
ment. The use of spares that are not original may cause vari-
ations in the performance and reduce the safety level of the
equipment. We are not liable for damage due to use of spare
parts that are not original.
Optional
NOTE: The digital control unit of the generator is fitted with a
control recognition device which allows it to identify which de-
vice is connected and take action accordingly.
CONVEX 4000-5000 Vision generators can be fitted with vari-
ous optional extras, such as:
REMOTE CONTROL ANALOGIC RC
This command (that must be plugged into the relevant connec-
tor on the front panel of the HT4 drawing unit):
• Completely replaces the ENCODER - A knob on the HT4
feeder's front panel.
• Partially (depending on the welding process selected) replac-
es the ENCODER - V knob on the HT4 feeder's front panel
(for further information see the relevant technical documen-
tation provided with the welding machine and feeder).
AIR AND/OR WATER COOLED UP/DOWN TORCH
This command (that must be plugged into the relevant con-
nector on the front panel of the HT4 drawing unit) works as an
alternative to:
• The ENCODER - A knob on the HT4 feeder's front panel. In
"synergic" MIG MAG and "manual" MIG MAG welding pro-
cesses, by pressing the two right (+) and left (-) buttons you
can regulate the values for the synergic welding parameters.
• The ENCODER - V knob on the HT4 feeder's front panel. In
the JOB welding process, by pressing the two right (+) and
left (-) buttons you can scroll the welding points set previ-
ously.
PUSH-PULL TORCH
The push-pull torch makes it possible to improve the alumini-
um wire feed, using the motor on the torch itself. The param-
eters normally regulated using the ENCODER - SX knob on
the welding machine's VS control panel, are now regulated us-
ing the potentiometer on the torch itself, when this torch is on.
The pointing out of any difficulties
and their elimination
The supply line is attributed with the cause of the most com-
mon difficulties. In the case of breakdown, proceed as follows:
1) Check the value of the supply voltage.
2) Check that the power cable is perfectly connected to the
plug and the supply switch.
3) Check that the power fuses are not burned out or loose.
4) Check whether the following are defective:
• The switch that supplies the machine
• The plug socket in the wall
• The generator switch
NOTE: Given the required technical skills necessary for the re-
pair of the generator, in case of breakdown we advise you to
contact skilled personnel or our technical service department.
Replacing the digital interface PCB
Proceed as follows:
• Unscrew the 4 screws fastening the front rack panel.
• Remove both the adjustment knobs.
• Extract wiring connectors from digital interface PCB.
• Unscrew the nuts and washers on the support.
• Remove the digital interface PCB by lifting it out of its sup-
ports.
• Proceed vice versa to assemble the new digital interface
PCB.
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