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Telwin EURARC 322 Seite 5

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(indispensable for technical assistance, requesting spare parts, For welders with double voltage supply, it is necessary to set the
discovering product origin). blocking screw of the voltage-reverse switch in the position corre
7- Performance of the welding circuit:
sponding to the voltage really available (see example below).
- U : maximum no-load voltage (open welding circuit).
Fig. G
0
__________________________________________________________________________________
- I /U : current and corresponding normalised voltage that the
2 2
welding machine can supply during welding.
WARNING! Failure to observe the above rules will make the
- X : Duty cycle: indicates the time for which the welding machine
(Class 1) safety system installed by the manufacturer ineffective
can supply the corresponding current (same column). It is
with consequent serious risks to persons (e.g. electric shock) and
expressed as %, based on a 10 min. cycle (e.g. 60% = 6 minutes
objects (e.g. fire).
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
CONNECTION OF THE WELDING CABLES
(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
WARNING! BEFORE MAKING THE FOLLOWING
(minimum-maximum) at the corresponding arc voltage.
8- Technical specifications for power supply line:
CONNECTIONS MAKE SURE THE WELDING MACHINE IS
- U : Alternating voltage and power supply frequency of welding
1
SWITCHED OFF AND DISCONNECTED FROM THE POWER
machine (allowed limit ±10%):
SUPPLY OUTLET.
- I : Maximum current absorbed by the line.
1 max
Table (TAB. 1) gives the recommended values for the welding cables (in
2
- I : Effective current supplied.
mm ) depending on the maximum current supplied by the welding
1eff
9- :
machine.
Size of delayed action fuses to be used to protect the
__________________________________________________________________________________
power line.
10- Symbols referring to safety regulations, whose meaning is given in
AC Versions:
chapter 1 “General safety considerations for arc welding”.
Connecting the electrode-holder clamp welding cable
On the end take a special terminal that is used to close the uncovered
Note: The data plate shown above is an example to give the meaning of
part of the electrode.
the symbols and numbers; the exact values of technical data for the
For welding machines supplied with a terminal, this cable is connected
welding machine in your possession must be checked directly on the
data plate of the welding machine itself.
to the terminal with the symbol .
OTHER TECHNICAL DATA
Connecting the welding current return cable
This is connected to the piece being welded or to the metal bench
- WELDING MACHINE: see table (TAB.1)
supporting it, as close as possible to the join being made. For welding
- ELECTRODE HOLDER CLAMP: see table (TAB. 2)
machines supplied with a terminal, the cable is connected to the
terminal with the symbol .
4. DESCRIPTION OF THE WELDING MACHINE
Control, regulation and connection devices
AC/DC Versions:
Fig. B
Almost all coated electrodes are connected to the positive pole (+) of
the power source; as an exception to the negative pole (-) for acid
5. INSTALLATION
__________________________________________________________________________________
coated electrodes.
WELDING OPERATIONS WITH DIRECT CURRENT
WARNING! CARRY OUT ALL INSTALLATION OPERATIONS
AND ELECTRICAL CONNECTIONS WITH THE WELDING MACHINE
Connecting the electrode-holder clamp welding cable
COMPLETELY SWITCHED OFF AND DISCONNECTED FROM THE
On the end take a special terminal that is used to close the uncovered
POWER SUPPLY OUTLET.
part of the electrode.
THE ELECTRICAL CONNECTIONS MUST BE MADE ONLY AND
This cable is connected to the terminal with the symbol (+).
EXCLUSIVELY BY AUTHORISED OR QUALIFIED PERSONNEL.
__________________________________________________________________________________
Connecting the welding current return cable
This is connected to the piece being welded or to the metal bench
PREPARATION
supporting it, as close as possible to the join being made.
Fig. C
This cable is connected to the terminal with the symbol (-).
Unpack the welding machine, assemble the separate parts contained in
the package.
WELDING OPERATIONS WITH ALTERNATING CURRENT:
Assembling the return cable-clamp
Fig. D
Electrode-holder clamp cable and earth cable to either of the related
terminals ( ~ / ~ ).
Assembling the welding cable-electrode holder clamp
TAKE THE GREATEST CARE TO CONNECT THE WELDING CABLES
Fig. E
CORRECTLY e.g. ( - ) / ~ or (+) / ~ ).
HOW TO LIFT THE WELDING MACHINE
Warnings:
The welding machine MUST be lifted as shown in Fig. F(only for the
- Turn the welding cable connectors right down into the quick
model I = 350A). For all other welding machines never use the
2 max
connections (if present), to ensure a perfect electrical contact;
handle for lifting.
otherwise the connectors themselves will overheat, resulting in
This holds for the first time the welding machine is installed and
their rapid deterioration and loss of efficiency.
throughout its entire working life.
- The welding cables should be as short as possible.
__________________________________________________________________________________
- Do not use metal structures which are not part of the workpiece to
substitute the return cable of the welding current: this could
WARNING! Position the welding machine on a flat surface
jeopardise safety and result in poor welding.
with sufficient carrying capacity for its weight, to prevent it from
tipping or moving hazardously.
6. WELDING: DESCRIPTION OF THE PROCEDURE
__________________________________________________________________________________
AC Versions:
These welding machines consist of a single phase drooping-type
CONNECTION TO THE MAIN POWER SUPPLY
transformer and are suitable for welding in alternating current with
- Before making any electrical connection, make sure the rating data
coated electrodes (E43R type).
of the welding machine correspond to the mains voltage and
AC/DC Versions:
frequency available at the place of installation.
These welding machines are power sources for mixed current (direct
- The welding machine should only be connected to a power supply
and alternating), which can be selected using the welding terminals,
system with the neutral conductor connected to earth.
and are suitable for arc welding using electrodes with various types of
- To comply with the requirements of the EN 61000-3-11 (Flicker)
coating (rutile, acid, basic).
standard we recommend connecting the welding machine to
To switch on the welding machine operate the main switch (Fig. B (1)).
interface points of the power supply that have an impedance of less
The intensity of the supplied welding current can be adjusted
than Zmax =0.06 ohm.
continuously, by means of a manually operated magnetic shunt (Fig. B
- the welding machine falls within the requisites of IEC/EN 61000-3-12
(4)). The value for the current setting, (I ) can be read in amps on the
2
standard.
graduated scale (Fig.B (2)) on the top or front panel. The
corresponding arc voltage (U ) for the current shown is given according
2
PLUG AND OUTLET
to the following relationship: U = (20 + 0,04 I ) V (EN 60974).
2 2
Connect a normalised plug (2P + T, 3P + T) having sufficient capacity- to
the power cable and prepare a mains outlet fitted with fuses or an
THERMOSTATIC PROTECTION
automatic circuit-breaker; the special earth terminal should be
This welder is automatically protected from thermic overheating
connected to the earth conductor (yellow-green) of the power supply
(thermostat automatic re-start). When the windings reach performance
line. Table (TAB.1) shows the recommended delayed fuse sizes in
temperature, the protections cut off the supply circuit, igniting the yellow
amps, chosen according to the max. nominal current supplied by the
lamp on the front panel (Fig. B (3)). After a few minutes’ cooling the
welding machine, and the nominal voltage of the main power supply.
protection will reopen the supply line and turn off the yellow lamp. The
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