Cebora 386 E Manual De Servicio página 19

1 GENERAL INFORMATION.
1.1 Introduction.
The purpose of this manual is to train personnel assigned
to carry out maintenance on the SYNSTAR 330 TC, art.
386 and SYNSTAR 330 TS, art. 388 welding systems.
1.2 General service policy.
It is the responsibility of the customer and/or operator
to use the equipment appropriately, in accordance with
the instructions in the Instructions Manual, as well as to
maintain the equipment and related accessories in good
working condition, in compliance with the instructions
provided in the Service Manual.
Any internal inspection or repairs must be carried out by
qualified personnel who are responsible for any interven-
tion on the equipment.
Any maintenance operation must be carried out in
compliance with standard CEI 26-29 (IEC 60974-4).
After making repairs, take care to organize the wiring so
that there is secure insulation between the primary and
secondary sides of the power source.
It is forbidden to attempt to repair damaged electronic
boards or modules; replace them with original Cebora
spare parts.
1.3 Safety information.
The safety notes provided in this manual are an integral
part of those given in the Instructions Manual.
Therefore, before working on the machine, please read the
paragraph on safety instructions in the aforementioned
manual.
Always disconnect the power cord from the mains, and
wait for the internal capacitors to discharge (1 minute) be-
fore accessing the interior of the equipment.
Some internal parts, such as terminals and dissipaters,
may be connected to mains or otherwise hazardous po-
tentials.
It is therefore forbidden to work with the safety guards
removed from the machine unless strictly necessary.
In this case, take special precautions such as wearing insu-
lating gloves and footwear and working in a perfectly dry
environment with dry clothing.
1.4 Electromagnetic compatibility.
Please read and observe the instructions provided in the
paragraph "Electromagnetic compatibility" of the Instruc-
tions Manual.
3302339/A
2 SYSTEM DESCRIPTION.
2.1 Introduction.
Synstar 330 TC and Synstar 330 TS are systems suitable
for synergic MIG/MAG and pulsed synergic MIG/MAG
welding processes, realized with inverter technology.
Each system is made up of the electronic power source
with integrated wire feeder unit and a series of accesso-
ries to adapt to various types of use (see list in the Sales
Catalogue).
The power source is controlled by microprocessor-based
circuits, which manage the operative functions of the
welding system and the operator interface.
The operator interface is developed via the Control Panel
built into the power source front panel.
The working programs respond to pre-programmed
synergic curves, that can be recalled from the control panel.
2.2 Technical specifications.
In order to verify the technical specifications, see the ma-
chine plate, power source Instructions Manual and Sales
Catalogue.
2.3 Art. 386 and 388 power sources.
The art. 386 and 388 are DC controlled-current power
sources comprised of a three-phase rectifier bridge, a DC/
AC converter (inverter) and an additional rectifier bridge.
Referring to the electrical diagrams in par. 5, drawings and
tables in par. 4, we can identify the main blocks that make
up the power sources.
The main switch (14) powers the power board (56) which
contains all power elements of the power source.
More precisely in the power board (56) they can be
identified (Fig. 2.3.1):
− the mains voltage filter for reduction of the conducted
interferences reflected in the mains;
− the input rectifier bridge that converts the mains volt-
age in DC voltage, for the inverter operation;
− the igbt inverter, that generates the square wave
alternated voltage for the "TR_POWER (57)" power
transformer;
− the TA, T2, for the relief of the power transformer (57)
primary winding current;
− the rectifier bridge of the power transformer (57)
secondary current.
On power board (56) is mounted, in a non-removable
way, a board that contain the inverter control circuits
(hereinafter will be called INV board).
EN
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