- 6 -
2.2 OPTIONAL ACCESSORIES
- Argon bottle adapter.
- Welding current return cable complete with earth clamp.
- Manual remote control with 1 potentiometer.
- Manual remote control with 2 potentiometers.
- Pedal remote control.
- MMA welding kit.
- TIG welding kit.
- Self-darkening mask: with fixed or adjustable filter.
- Gas connector and pipe for hook-up with Argon bottle.
- Pressure reducing valve with gauge.
- Torch for TIG welding.
3. TECHNICAL DATA
3.1 DATA PLATE (FIG. A)
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
0
:
maximum no-load voltage (open welding circuit).
- 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 standby 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.
3.2 OTHER TECHNICAL DATA
- WELDING MACHINE:
see table 1 (TAB. 1)
- TORCH:
see table 2 (TAB. 2)
The welding machine weight is shown in table 1 (TAB. 1).
4. DESCRIPTION OF THE WELDING MACHINE
4.1 BLOCK DIAGRAM
The welding machine consists basically of power and control modules made on PCB’s
and optimised to achieve perfect reliability and reduced maintenance.
This welding machine is controlled by a microprocessor that allows a large number
of parameter settings so as to achieve perfect welding in any condition and with any
material. However, to make the best use of its properties it is necessary to be fully
aware of its possibilities.
Description (FIG. B)
1- Single phase power supply input, rectifier unit and levelling capacitors.
2- Transistor (IGBT) switching bridge and drivers;
commutes the rectified power
supply voltage to high frequency alternating voltage and adjusts the power
according to the required welding current/voltage.
3- High frequency transformer;
the voltage converted by block 2 powers the
primary winding; its function is to adjust the voltage and current to the values
needed for the arc welding procedure and at the same time to form galvanic
separation of the welding circuit from the power supply line.
4- Secondary rectifier bridge with levelling inductance;
commutes the alternating
voltage / current supplied by the secondary winding into very low ripple direct
current / voltage.
5- Transistor switching bridge and drivers;
transforms the secondary output
current from DC to AC for TIG AC welding.
6- Control and adjustment electronics;
controls the welding current value
instantaneously and compares it with the operator’s setting; modulates the
control impulses from the IGBT drivers that make the adjustment.
7- Welding machine operation control logic;
sets the welding cycles, controls the
actuators, supervises the safety systems.
8- Settings panel
and display of parameters and operating modes.
9-
HF strike generator.
10- Protective gas solenoid valve EV.
11- Welding machine cooling fan.
12- Remote control.
4.2 CONTROL, ADJUSTMENT AND CONNECTION DEVICES
4.2.1 BACK PANEL (FIG. C)
1-
Power supply cable 2P + (P.E).
2-
Main switch O/OFF - I/ON.
3-
Gas pipe connector (bottle pressure reducing valve welding machine).
4-
Remote control connector:
Using the special 14-pin connector on the back, it is possible to attach different
types of remote control to the welding machine. Each device will be recognised
automatically and can be used to adjust the following parameters:
- Remote control with one potentiometer:
turning the potentiometer knob will change the main current from the minimum
to the maximum. The main current is adjusted only and exclusively by the
remote control.
- Pedal remote control:
The current value is determined by the position of the pedal. In addition, in TIG
2-STROKE mode pressing the pedal gives the start command to the machine
instead of the torch button.
- Remote control with two potentiometers:
The first potentiometer regulates the main current. The second potentiometer
adjusts another parameter which is dependent on the active welding mode. By
rotating this potentiometer, the parameter being adjusted is displayed (which
can no longer be controlled by means of the knob on the panel). The meaning
of the second potentiometer is: ARC FORCE if in MMA mode and END SLOPE
if in TIG mode.
4.2.2 Front panel (FIG. D)
1- Operating mode selectors:
TIG/MMA mode selector:
Operating mode: TIG 2-STROKE, TIG 4-STROKE and MMA mode.
TIG mode selector:
Operating mode: TIG DC with HF striking, TIG DC with LIFT, TIG
AC striking.
2- Leds for welding parameters setting.
Fixed led: first function (black field);
Flashing led: second function (yellow field).
3- Alphanumeric display .
4- Green led indicating output voltage presence.
5- Yellow led:
normally off; when lit, it indicates the blocking of the welding machine
due to the intervention of one of the following protections:
- Thermal protection: if an excessive temperature is reached within the welding
machine, the machine remains switched on without providing current until
normal temperature is reached. The resetting is automatic.
- Protection against line over-voltage an under-voltage: it blocks the welding
machine if the line voltage is too high (greater than 264V ac) or too low (less
than 190V ac).
- Protection against short circuits: if a short circuit has taken place with a duration
exceeding 1.5 seconds (electrode sticking) the welding machine is blocked.
The resetting is automatic.
The coding on display is the following:
”AL. 1”:
anomaly in the primary power supply: the power supply voltage is out of
range +/- 15% as related to the nominal value on the tag.
WARNING: By exceeding the upper voltage limit specified above will
seriously damage the device.
”AL. 2”
kicking-in of one of the two safety thermostats due to the overheating of
the welding machine.
6-
Button and Encoder
for the selection and setting of welding parameters.
Allows the selection of one of the available parameters associated with the
welding mode/current indicated by the switching on of one of the Leds (2).
Led 1
First function:
Arc Force
In the MMA mode, it allows adjustment of the ”Arc Force” dynamic over-current
(adjustment 0-100%) with indication on display of the percentage increment
as compared with the pre-selected welding current’s value. This adjustment
improves the fluidity of the welding and prevents the electrode sticking to the
piece.
Pregas
In the TIG mode, it allows adjustment of the pregas time in seconds.
Second function:
ELECTRODE PREHEATING
In TIG mode, AC represents the result of the current multiplied by the Tungsten
electrode preheating time from when the arc is switched on.
Led 2
First function:
INITIAL CURRENT
In the TIG 4-stroke mode, it allows adjustment of the initial current which is
maintained while the torch pushbutton remains pressed.
Second function:
BI-LEVEL
In TIG 4-stroke mode, it activates the BI-LEVEL function and allows adjustment of
the second-level current permitting manual selection (from the torch pushbutton
during the welding operation) between two different current levels: I
2
and I
1
. The
I
2
main level current is defined by the welding current set, whereas level I
1
can be
changed by means of the Encoder, between the current’s minimum value and the
value of the main welding current.
In order to disable the operation in BI-LEVEL, rotate the Encoder in an anti-
clockwise direction, until the message ”OFF” is displayed.
Led 3
First function:
Main current
In TIG DC and MMA mode, it allows adjustment of the welding current’s mean
value.
In TIG AC mode, it allows adjustment of the welding current’s effective value.
Second function:
PULSED MODE OPERATION
In TIG AC/DC mode, it activates the PULSED operation and allows adjustment of
the second level current I
1
, which can be alternated with the main current I
2
in the
pulse.
The value of current I
1
. can vary between the minimum and the main welding
current value I
2
.
In order to disable the PULSED operation, rotate the Encoder in an anti-clockwise
direction until the message ”OFF” is displayed.
Summary of Contents for TIG AC/DC HF/LIFT MMA
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Page 40: ...40 8 LED Argon 99 5...
Page 103: ...103 7 2 IEC EN 60974 4 8 ON 99 5...
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