Telwin TECNICA 211/S ACX PLASTIC C.CASE Manuel D'instructions page 6

for direct current (DC) .
The speci c 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).
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:
1- Protection rating of the covering.
2- Symbol for power supply line:
1~: single 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 identi cation
(indispensable for technical assistance, requesting spare parts,
discovering product origin).
8- Performance of the welding circuit:
- U : maximum no-load voltage.
0
- I /U : current and corresponding normalised voltage that the
2 2
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 speci cations for power supply line:
- U : Alternating voltage and power supply frequency of welding
1
machine (allowed limit ±10%):
- I : Maximum current absorbed by the line.
1 max
- I : e ective current supplied.
1e
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)
Fig. A
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- Power supply input (1~), recti er group and balancing capacitors.
2- Transistors and drivers switching bridge (IGBT).
It turns the mains recti ed 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 recti er 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 o and on again.
Wait until the LED (Fig.C(3)) has gone out completely before
switching on again.
CONTROL, REGULATION AND CONNECTION DEVICES
Front Panel
1- Positive quick plug (+) to connect welding cable.
2- YELLOW LED: normally o , when ON it means that the welding
current cannot ow 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.
Back panel
1- Mains cable with E.E.C. 2p plug + (
(For the "DUAL VOLTAGE AUTOMATIC" model the cable has no plug).
2- General luminous switch O/OFF - I/ON.
5. INSTALLATION
WARNING! CARRY OUT ALL INSTALLATION OPERATIONS
AND ELECTRICAL CONNECTIONS WITH THE WELDING MACHINE
COMPLETELY SWITCHED OFF AND DISCONNECTED FROM THE
- 6 -
Fig. B
WELDING MACHINE
Fig. C
Fig. D
).