System Description; Introduction; Technical Specifications; Description Of Power Source Art. 283 - Cebora TRI STAR MIG 1635/M Service Manual

CEBORA S.p.A.

2 - SYSTEM DESCRIPTION

2.1 - Introduction.

The TRI STAR MIG 1635/M is a multiprocess system for MIG/MAG, TIG-DC and MMA
welding.
It is made up of an electronic power source (art. 283) and a set of accessories to adapt to
various types of applications (see list in the Sales Catalogue).
The power source is controlled by microprocessor circuits, which manage 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. 283.

Art. 283 is a direct current power source with controlled current, consisting of a single-phase
bridge rectifier and a DC/DC converter.
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 (9) powers the power board (32), that is the actual welding current power
source, and converts the alternating mains voltage into direct voltage adjusted according to
welding needs.
It contains all power circuit components:
− the power bridge rectifier, equipped with a DC-capacitors pre-charge circuit, which generates
the 320 Vdc voltage to power the igbt inverter section;
− the DC-capacitors to level this dc voltage;
− the igbt inverter, which generates the square-wave alternating voltage for power transformer;
− the power transformer, and the TA to detect the current at the primary circuit of the power
transformer;
− the diode group, made up of two diodes connected to a shared cathode, that rectifies the
alternating voltage, generated by the power transformer secondary winding, to make it
available at the power source output terminals;
− the service transformer for control circuits power supply.
The power transformer, powered by the igbt inverter, provides the secondary circuit with
voltage and current values suitable for welding. A different winding gives the voltage supply for
the wire feeder motor (31) control circuit on control board (29).
The TA mounted on the power board (32) provides the control board (29) with the signal of
the transformer primary current, for the welding current regulation.
The control board (29) contains the main power source microprocessor, and supervises
management of the complete power source.
In the control board (29) is generated the PWM signal to send to the inverter igbt, and the
wire feeder motor voltage supply, with regulation based on the selected welding program
requirements.
The control board (29), also acts as power source control panel, and contains the following
commands and indicators to perform the supervision and management of the complete power
source (see Instruction Manual for more informations):
− two potentiometers to adjust the output voltage, welding current, and the values assignable to
the parameters indicated by displays;
− a set of leds to indicate the parameters shown on displays;
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22/09/2008