Telwin Etronithy 400 Manual De Instrucciones página 5

Electronic reactance
Arc Force ; adjustment range : 0÷100%.
5. INSTALLATION
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WARNING! CARRY OUT ALL INSTALLATION
OPERATIONS AND ELECTRICAL CONNECTIONS WITH
THE WELDING MACHINE COMPLETELY SWITCHED
OFF AND DISCONNECTED FROM THE POWER SUPPLY
OUTLET.
THE ELECTRICAL CONNECTIONS MUST BE MADE
ONLY AND EXCLUSIVELY BY AUTHORISED OR
QUALIFIED PERSONNEL.
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PREPARATION (Fig. F)
Unpack the welding machine, assemble the separate parts
contained in the package.
Assembling the protective mask (Fig. G)
Assembling the return cable-clamp (FIG. H)
Assembling the welding cable-electrode holder clamp
(FIG. I)
HOW TO LIFT THE WELDING MACHINE
The welding machine MUST be lifted as shown in Fig. L.
This holds for the first time the welding machine is installed
and throughout its entire working life.
Note: Before lifting it is essential to disassemble, if present,
the wire feeder, the gas bottle, the power and interconnecting
cables and pipes; make sure the lifting cables, belts or chains
do not damage the accessories to the welding machine.
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.
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WARNING! Position the welding machine on a flat
surface with sufficient carrying capacity for its weight,
to prevent it from tipping or moving hazardously.
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CONNECTION TO THE MAIN POWER SUPPLY
- Before making any electrical connection, make sure the
rating data of the welding machine correspond to the
mains voltage and frequency available at the place of
installation.
- The welding machine should only be connected to a power
supply system with the neutral conductor connected to
earth.
- To ensure protection against indirect contact use residual
current devices of the following types:
- Type B ( ) for 3-phase machines.
- To comply with the requirements of the EN 61000-3-11
(Flicker) standard we recommend connecting the welding
machine to interface points of the power supply that have
an impedance of less than Zmax =0.15 ohm.
Plug and outlet
Connect a normalised plug (3P + T) - having sufficient
capacity- to the power cable and prepare a mains outlet fitted
with fuses or an automatic circuit-breaker; the special earth
terminal should be connected to the earth conductor (yellow-
green) of the power supply line. Table (TAB.1) shows the
recommended delayed fuse sizes in amps, chosen
according to the max. nominal current supplied by the
welding machine, and the nominal voltage of the main power
supply.
Voltage change (just for the I max=350A version)
For machines designed for dual voltage power supplies, it is
necessary to set the locking screw on the voltage reverse
knob in the position corresponding to the actual available
voltage (Fig. M).
Voltage change (just for the I max=500A version)
To carry out voltage change operations, take off the panel to
gain access to the inside of the machine, and prepare the
voltage change terminal board so that the connection
indicated on the special indicator plate corresponds to the
available power supply voltage.
Reassemble the panel carefully using the appropriate
screws.
Warning!
In the factory the machine is set at the highest voltage of
the available range, e.g.
U 400V Ü Voltage setting at the factory.
1
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WARNING! Failure to observe the above rules will
make the (Class 1) safety system installed by the
manufacturer ineffective with consequent serious risks
to persons (e.g. electric shock) and objects (e.g. fire).
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CONNECTION OF THE WELDING CABLES
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WARNING! BEFORE MAKING THE FOLLOWING
CONNECTIONS MAKE SURE THE WELDING MACHINE
IS SWITCHED OFF AND DISCONNECTED FROM THE
POWER SUPPLY OUTLET.
Table (TAB. 1) gives the recommended values for the
welding cables (in mm ) depending on the maximum current
supplied by the welding machine.
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MMA WELDING
Almost all coated electrodes are connected to the positive
pole (+) of the power source; as an exception to the negative
pole (-) for acid coated electrodes.
Connecting the electrode-holder clamp welding cable
On the end take a special terminal that is used to close the
uncovered part of the electrode.
This cable is connected to the terminal with the symbol (+)
Connecting the welding current return cable
This is connected to the piece being welded or to the metal
bench supporting it, as close as possible to the join being
made.
This cable is connected to the terminal with the symbol (-)
Warnings:
- Turn the welding cable connectors right down into the
quick connections (if present), to ensure a perfect
electrical contact; otherwise the connectors themselves
will overheat, resulting in their rapid deterioration and loss
of efficiency.
- 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 jeopardise safety and result in poor
welding.
6. WELDING: DESCRIPTION OF THE PROCEDURE
COATED ELECTRODE WELDING
- Most stick electrodes are connected to the positive pole,
although certain types must be connected to the negative
pole, connect according to either type to the (+) or (-) quick
plugs.
- It is most important that the user refers to the maker's
instructions indicated on the stick electrode packaging.
This will indicate the correct polarity of the stick electrode
and the most suitable current.
- The welding current must be regulated according to the
diameter of the electrode in use and the type of the joint to
be carried out: see below the currents corresponding to
various electrode diameters:
- 5 -
2
2
Fig. N
2