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CEBORA S.p.A.
2 - SYSTEM DESCRIPTION
2.1 - Introduction.
The BI-WELDER 1365 is a system for MMA and TIG welding, with contact arc starting.
It is made up of an electronic power source (art. 254), and a set of accessories to adapt to
various applications (see list in Sales Catalogue).
The power source is controlled by a microprocessor circuit, which manages the operative
functions of the welding system and operator interface.
2.2 - Technical specifications.
To verify the technical specifications, see the machine plate, Instruction Manual, and Sales
Catalogue.
2.3 - Description of power source art. 254.
Art. 254 is a voltage power source with controlled current, consisting of a single-phase
rectifier bridge and a DC/DC mosfet converter.
It may be powered at either 115 or 230 Vac; the unit adapts automatically based on the
voltage applied to the power source input.
Referring to the electrical diagram in par. 5.1, drawing 4.1 and table 4.2, we can identify the
main blocks that make up the power source.
The main switch (5) powers the filter board (10), which contains the filter to reduce
conducted interference reflected in the mains.
The power board (13) is the actual welding current power source, which converts the
alternating voltage at the filter board (10) output into direct current adjusted according to
welding needs. It contains both the power circuit and the control circuits to manage the functions
of the power source art. 254.
The welding current is regulated by the microprocessor of the power board (13), based on the
signals received from potentiometer on the front panel.
The microprocessor also controls the condition of the supply voltage, to activate the supply
voltage selection (115 or 230 Vac), and any safety devices necessary to protect the power source
(see Error codes par. 3.4).
In the case of a 115 Vac power supply, a dedicated voltage duplicator circuit, present in the
power board (13), raises the direct current on the capacitors of the power board (13) to a value
close to the one obtained with a supply voltage of 230 Vac (320 Vdc approximately). Thus the
DC/DC converter, connected downstream of the capacitors in series on the power board (13),
always works the same way, regardless of the supply voltage.
As in previous case, also fan (9), connected to the power board (13), is ever supplied at 230
Vac, also with power source voltage mains at 115 Vac.
The front panel contains two leds for signaling over power source working condition.
The green led (C ) (fig. 3.2.1) indicates power board (13) is supplied.
The meaning of the yellow led (B) is described in par. 3.4 codes error.
For power source operation is sufficient the mains voltage supply, and the only available
regulation is the welding current adjusting, making up by potentiometer (A) on frontal panel.
Up on supplied with nominal voltage, the power source executes the "lamp-test", and after
that output voltage generation starts. In this situation power source in ready to weld both in
MMA or TIG.
In TIG, the welding arc starts by contact between the electrode and the workpiece. Power
source doesn't manage the gas circuit, therefore they have to use a built-in gas valve torch (i.e.:
torch T150, art. 1567.01 Cebora).
3.302.110
4
18/11/02
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