- 6 -
(rutile, acid, basic).
Regulation with the “inverter” system at the input of the power supply
line (primary) means there is a drastic reduction in the volume of
both the transformer and the levelling reactance. This allows the
construction of a welding machine with extremely reduced weight
and volume, enhancing its advantages of easy handling and
transportation.
OPTIONAL ACCESSORIES:
- MMA welding Kit.
- TIG welding Kit.
- Argon gas bottle adapter.
- Pressure reducing valve with gauge.
- TIG welding torch.
3. TECHNICAL DATA
DATA PLATE
The most important data regarding use and performance of the
welding machine are summarised on the rating plate and have the
following meaning:
Fig. A
1-
Protection rating of the covering.
2-
Symbol for power supply line:
1~ : single phase alternating voltage;
3~ : three phase alternating voltage.
3-
Symbol
S
: indicates that welding operations may be carried out
in environments with heightened risk of electric shock (e.g. very
close to large metallic volumes).
4-
Symbol for welding procedure provided.
5-
Symbol for internal structure of the welding machine.
6-
EUROPEAN standard of reference, for safety and construction
of arc welding machines.
7-
Manufacturer’s serial number for welding machine identification
(indispensable for technical assistance, requesting spare parts,
discovering product origin).
8-
Performance of the welding circuit:
- U
0
:
maximum no-load voltage.
- I
2
/U
2
:
current and corresponding normalised voltage that the
welding machine can supply during welding
- X :
Duty cycle: indicates the time for which the welding
machine can supply the corresponding current (same column).
It is expressed as %, based on a 10 minutes cycle (e.g. 60% =
6 minutes working, 4 minutes pause, and so on)
.
If the usage factors (on the plate, referring to a 40°C
environment) are exceeded, the thermal safeguard will
trigger (the welding machine will remain in stand-by until its
temperature returns within the allowed limits).
- A/V-A/V :
shows the range of adjustment for the welding
current (minimum-maximum) at the corresponding arc voltage.
9-
Technical specifications for power supply line:
- U
1
:
Alternating voltage and power supply frequency of welding
machine (allowed limit ±10%):
- I
1 max
:
Maximum current absorbed by the line.
- I
1eff
:
effective current supplied.
10-
:
Size of delayed action fuses to be used to protect the
power line.
11-
Symbols referring to safety regulations, whose meaning is given
in chapter 1 “General safety considerations for arc welding”.
Note: The data plate shown above is an example to give the meaning
of the symbols and numbers; the exact values of technical data for
the welding machine in your possession must be checked directly on
the data plate of the welding machine itself.
OTHER TECHNICAL DATA
- WELDING MACHINE:
- see table 1
(TAB.1)
- %USE AT 20°C (if present on the top cover of the welding
machine)
USE AT 20°C, it gives, for each diameter (Ø ELECTRODE), the
number of weldable electrodes within an interval of 10 minutes
(ELECTRODES 10 MIN) at 20°C with a pause of 20 seconds for
each electrode change; this datum is given also in percentage
(%USE) which is the value in comparison with the maximum
number of weldable electrodes.
- ELECTRODE HOLDER CLAMP: see table 2 (TAB.2)
The weight of the welding machine is given in the table 1 (TAB.1)
4. DESCRIPTION OF THE WELDING MACHINE
The unit is comprised of power modules which have been developed
on a specially printed circuit designed to maximise reliability and
reduce maintainance.
Fig. B
1- Power supply input (1~) / (3~), 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 has the function of adapting
voltage and 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.
The ”DUAL VOLTAGE AUTOMATIC” model has a device that
automatically recognises the power supply voltage (115V AC- 230V
AC) and sets up the machine for correct operation.
The user will be able to understand whether the machine power
supply is 115V AC or 230V AC from the colour of the LED
(Fig C (3))
.
- GREEN LED
shows that the machine is connected to a 230V AC
power supply.
- ORANGE LED
shows that the machine is connected to a 115V AC
power supply.
During operation at 115V AC it is possible that prolonged and
sizeable voltage surges will cause the machine to switch to
230V AC operation for safety.
In such circumstances, to resume welding, the machine must
be switched off and on again.
Wait until the LED (Fig.C(3)) has gone out completely before
switching on again.
CONTROL, REGULATION AND CONNECTION DEVICES
WELDING MACHINE
Front Panel:
Fig. C
1- Positive quick plug (+) to connect welding cable.
2-
YELLOW LED:
normally off, when ON it means that the welding
current cannot flow due to one of the following faults:
- Thermal protection:
inside the machine the temperature is
excessive. The machine is ON but does not deliver current
until a normal temperature is reached. Once this happens the
re-start is automatic.
- Mains over/undervoltage protection:
the machine is
blocked: the power supply voltage is 15% above or below the
rating plate value.
WARNING: Exceeding the upper voltage
limit, as above, will cause serious damage to the device
.
- ANTI STICK protection:
automatically shuts down the
welding machine if the electrode sticks to the material being
welded so that it can be removed manually without damaging
the electrode holder clamp.
3-
GREEN LED:
Connection to the mains, machine ready to work.
4- Potentiometer to regulate welding current with graduated scale
in Amps, which also allows regulation during welding.
(The “DUAL VOLTAGE AUTOMATIC” model has a double
graduated Ampere scale).
5- Negative quick plug (-) to connect welding cable.
6-
WELDING MACHINE WITH TWO-POSITION SWITCH:
•
MMA electrode welding:
The HOT START and ARC FORCE devices guarantee easy
starting and fluid welding for all types of electrode.
•
TIG welding with scratch strike:
ANTI STICK device specific for TIG.
(HOT START and ARC FORCE not enabled).
