4. DESCRIPTION OF WELDING MACHINE
4.1
The unit is comprised of power modules which have been developed on a specially printed circuit designed to
maximize reliability and reduce maintenance.
1- Power supply input (1~), rectifier group and balancing capacitors.
2- Transistors and drivers switching bridge (IGBT). It turns the mains rectified voltage into high frequency alternate
voltage and permits power regulation according to the current/ voltage of the weld to be done.
3- High frequency transformer: the primary windings are fed by the voltage converted by Block 2, it adapts the voltage
and the current to the values required by the arc welding procedure and, simultaneously, isolates the welding circuit
from the mains.
4- Secondary rectifier bridge with inductance: this changes the alternate voltage/current supplied by the secondary
windings into continuous current/voltage at a low wave-length.
5- Electronic and regulation board: this instantly checks the value of the welding current against that selected by the
user, it modulates the commands of the IGBT drivers, which control regulation, determines the dynamic response of
the current while the electrode melts (instantaneous short circuits), and supervises the safety systems.
4.2 Panels
Front
Back
1) Negative quick plug (-) to connect welding cable
2) Positive quick plug (+) to connect welding cable
3) Welding current display
4) Power supply control
– the machine is ready to work
5) Handle
6) Thermal protection control; mains over/undervoltage protection; ANTI STICK protection (preventing the
electrode from sticking to the welded material)
7) Welding current knob
8) ON/OFF switch
9) Power supply cable 230V
10) Fan
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