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emergencies.
Technical protection measures MUST BE taken as
described in 5.10; A.7; A.9. of the "IEC TECHNICAL
SPECIFICATION or CLC/TS 62081".
- The operator MUST NOT BE ALLOWED to weld in
raised positions unless safety platforms are used.
- VOLTAGE BETWEEN ELECTRODE HOLDERS OR
TORCHES: working with more than one welding
machine on a single piece or on pieces that are
connected electrically may generate a dangerous
accumulation of no-load voltage between two
different electrode holders or torches, the value of
which may reach double the allowed limit.
An expert coordinator must use measuring
instruments to determine the existence of a risk and
should take suitable protection measures as detailed
in 5.9 of the "IEC TECHNICAL SPECIFICATION or
CLC/TS 62081".
RESIDUAL RISKS
- IMPROPER USE: it is hazardous to use the welding
machine for any work other than that for which it was
designed (e.g. de-icing mains water pipes).
2. INTRODUCTION AND GENERAL
DESCRIPTION
This welding machine is a power source for arc welding,
made specifically for direct current (DC) .
The specific characteristics of this regulation system
(INVERTER), i.e. high speed and precise regulation, mean
the welding machine gives excellent results when welding
both with coated electrodes (rutile, acid, basic) and TIG.
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
DAT A PLATE
The most important data regarding use and performance of
the welding machine are summarised on the rating plate and
have the following meaning:
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 : maximum no-load voltage (open welding circuit).
0
- I /U : current and corresponding normalised voltage
2
2
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
Fig. A
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 : Alternating voltage and power supply frequency of
1
welding machine (allowed limit ±10%):
- I
: Maximum current absorbed by the line.
1 max
- I
: : effective current supplied.
1eff
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 (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.
1 - Mains input (single phase), rectifier unit and condenser.
2 - Transistors and drivers switching bridge (IGBT).
It turns the mains rectified voltage into high frequency
alternate voltage (
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 - Secondar y 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 VOL TAGE AUTOMA TIC" 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
- 11 -
Fig. B
40 kHz, 55 kHz, 65 kHz
) and permits
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