System Description; Introduction; Technical Specifications; Description Of Power Source Art. 285 - Cebora SOUND MIG 2035/M Pulse Service Manual

CEBORA S.p.A.

2 - SYSTEM DESCRIPTION

2.1 - Introduction.

The SOUND MIG 2035/M Pulse is a system for MIG/MAG pulsed synergic, MIG/MAG non-
pulsed synergic and MIG/MAG conventional welding.
It is made up of an electronic power source (art. 285), and a set of accessories to adapt to
various types of 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. The working programs may be defined
by the operator or respond to pre-programmed synergic curves.

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. 285.

Art. 285 is a direct current power source with controlled current, consisting of a single-phase
rectifier bridge and a DC/AC converter (inverter), as well as an additional rectifier bridge.
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 (16) powers the filter board (47), which contains the filter to reduce
conducted interference reflected in the mains. At its output is connected the power board (26)
which contains:
− the power rectifier bridge, which generates the 320 Vdc voltage to power the power supply
board (25) and the igbt inverter;
− the DC-capacitors to level this direct current;
− the igbt inverter, which generates the square-wave alternating voltage for transformer (30);
− the driver-igbt board, to drive the igbt of the inverter;
− the TA to detect the current at the primary circuit of the transformer (30).
The inductor-DC (50) connected to terminals TP5 and TP6 of the power board (26)
contributes to the direct current leveling at the igbt inverter input.
The rectifier bridge is equipped with a DC-capacitors pre-charge circuit, controlled by the
control board (27). The fan (24) to cool the power elements of the power source, and connected
to the power board (26), is also controlled directly by the control board (27).
The 320-Vdc voltage present at the output of the rectifier bridge is applied to the power
supply board (25), which acts as the main power pack and generates the service voltages for the
various power source circuits.
The igbt inverter is made up of four igbt connected in an "H-bridge" configuration, driven by
the driver-igbt board permanently mounted on the power board (26). This board performs the
isolated commands for the igbt, based on the PWM signals generated by the control board (27).
The welding current is adjusted in the igbt inverter, by modulating the PWM1 and PWM2,
signals, generated by control board (27) and sent to the igbt-driver board.
The TA mounted on the power board (26) provides the control board (27) with the signal of
the transformer (30) primary current, to verify correct operation of the inverter; this signal does
not normally affect the welding current adjustment.
The transformer (30), powered by the igbt inverter, provides the secondary circuit with
voltage and current values suitable for welding. Its secondary circuit is a central socket type, and
is connected to the choke (29) which levels the welding current, and the diode group (56), which
rectifies the alternating current generated by the inverter to make it available at the power source
output.
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24/03/2004