Telwin TECNICA 114 Manual De Instrucciones página 12

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 : 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 1 (TAB.1)
- ELECTRODE HOLDER CLAMP: see table 2 (TAB.2)
The welding machine weight is shown in 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.
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 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 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 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.
Fig. B
Wait until the LED (Fig.C(3)) has gone out completely
before switching on again.
CONTROL, REGULATION AND CONNECTION
DEVICES
WELDING MACHINE
Front Panel
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: when mains
voltage is either too high or too low the machine is
blocked.
- 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 VOLT AGE AUTOMA TIC" 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 AUTOMA TIC" 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 COMPLETEL Y SWITCHED
OFF AND DISCONNECTED FROM THE POWER SUPPLY
OUTLET.
THE ELECTRICAL CONNECTIONS MUST BE MADE
ONLY AND EXCLUSIVEL Y BY AUTHORISED OR
QUALIFIED PERSONNEL.
________________________________________________________________________________
Unpack the welding machine, assemble the separate parts
contained in the package.
Assembling the return cable-clamp
Assembling the welding cable-electrode holder clamp
POSITION OF THE WELDING MACHINE
Choose the place to install the welding machine so that the
cooling air inlets and outlets are not obstructed (forced
circulation by fan, if present); at the same time make sure
that conductive dusts, corrosive vapours, humidity etc. will
not be sucked into the machine.
Leave at least 250mm free space around the welding
machine.
______________________________________________
WARNING! Position the welding machine on a flat
surface with sufficient carrying capacity for its weight,
to prevent it from tipping or moving hazardously.
______________________________________________
CONNECTION TO THE MAIN POWER SUPPLY
- Before making any electrical connection, make sure the
rating data of the welding machine correspond to the
- 12 -
Fig. C
Fig. D
PREPARATION
Fig. E
Fig. F