Telwin TW821075 Manual Del Usuario página 7

the earth conductor (yellow-green) of the power supply line. Table
1 (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.
- To carry out voltage change operations(only the 3-phase version),
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 <= Voltage setting at the factory.
1
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 A ( ) for single phase machines;
- Type B (
- 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 =0.1 ohm.
- the welding machine falls within the requisites of IEC/EN 61000-3-
12 standard.
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).
CONNECTION OF THE WELDING CABLES
WARNING! BEFORE MAKING THE FOLLOWING
CONNECTIONS MAKE SURE THE WELDING MACHINE IS
SWITCHED OFF AND DISCONNECTED FROM THE POWER
SUPPLY OUTLET.
Table 1 (TAB. 1) gives the recommended values for the welding
cables (in mm ) depending on the maximum current supplied by the
2
welding machine.
Connection to the gas bottle (if used)
- Gas bottle can be loaded on welding machine bottle support
platform: max 20 kg.
- Screw the pressure reducing valve(*) onto the gas bottle valve,
inserting the appropriate adapter supplied as an accessory, for
when the gas used is Argon or an Argon /CO
- Connect the gas inlet pipe to the pressure-reducing valve and
tighten the band supplied.
- Loosen the adjustment ring nut on the pressure-reducing valve
before opening the bottle valve.
(*) Accessory to be purchased separately if not supplied with the
product.
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.
Connecting the torch (only for versions with EURO connector)
Engage the torch with its dedicated connector by tightening the
locking ring manually as far down as it will go. Prepare the wire for
loading the first time by dismantling the nozzle and the contact tube
to ease its exit.
Fig. F
) for 3-phase machines.
mixture.
2
Changing the polarity
(only for GAS-NO GAS versions)
- Open the reel compartment door.
- MIG/MAG welding (gas):
- Connect the torch cable from the wire feeder to the red terminal
(+).
- Connect the clamp return cable to the black terminal (-).
- FLUX welding (no gas):
- Connect the torch cable from the wire feeder to the black terminal
(-).
- Connect the clamp return cable to the red terminal (+).
- Close the reel compartment door.
LOADING THE WIRE REEL (Fig. H)
WARNING! BEFORE STARTING THE OPERATIONS
TO LOAD THE WIRE MAKE SURE THE WELDING MACHINE
IS SWITCHED OFF AND DISCONNECTED FROM THE MAIN
POWER SUPPLY OUTLET.
MAKE SURE THAT THE WIRE FEEDER ROLLERS, THE WIRE
GUIDE HOSE AND THE CONTACT TIP OF THE TORCH MATCH
THE DIAMETER AND TYPE OF WIRE TO BE USED AND MAKE
SURE THAT THESE ARE FITTED CORRECTLY. WHEN INSERTING
AND THREADING THE WIRE DO NOT WEAR PROTECTIVE
GLOVES.
- Open the reel compartment door.
- Position the wire reel on the spindle, holding the end of the wire
upwards; make sure the tab for pulling the spindle is correctly
seated in its hole (1a).
- Release the pressure counter-roller(s) and move them away from
the lower roller(s) (2a-b);
- Make sure that the towing roller(s) is suited to the wire used (2c).
- Free the end of the wire and remove the distorted end with a clean
cut and no burr; turn the reel anti-clockwise and thread the end of
the wire into the wire-guide infeed, pushing it 50-100mm into the
wire guide of the torch fitting (2d).
- Re-position the counter-roller(s), adjusting the pressure to an
intermediate value, and make sure that the wire is correctly
positioned in the groove of the lower roller(s) (3)
- Use the adjustment screw located at the centre of the spindle to
apply a slight braking pressure on the spindle itself (1b).
- Remove the nozzle and contact tip (4a).
- Insert the welding machine plug in the power supply outlet, switch
on the welding machine, press the torch button and wait for the end
of the wire to pass through the whole of the wire guide hose and
protrude by 10-15 cm from the front part of the torch, release the
button.
WARNING! During these operations the wire is live and
subject to mechanical stress; therefore if adequate precautions
are not taken the wire could cause hazardous electric shock,
injury and striking of electric arcs:
- Do not direct the mouthpiece of the torch towards parts of the body.
- Keep the torch away from the gas bottle.
- Re-fit the contact tip and the nozzle onto the torch (4b).
- Check that wire feed is regular; set the roller and spindle braking
pressure to the minimum possible values making sure that the wire
does not slide in the groove and when feed is halted the loops of
wire are not loosened by excessive reel inertia.
- Cut the end of the wire so that 10-15 mm protrude from the nozzle.
- Close the reel compartment door.
6. WELDING: DESCRIPTION OF THE PROCEDURE
- Connect the return cable to the piece to be welded.
- Check the polarity (only for FLUX versions).
- If solid wire is used, open and adjust the flow of shielding gas by
means of the pressure reducer.
NOTE: remember to shut the shielding gas off when you finish
work.
- Switch the welder on and set the welding current by means of the
switches or rotary switch (if any).
- 7 -
Fig. G
Fig. I