Telwin BIMAX 120 AUTOMATIC Manuel D'instructions page 7

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 ( ) 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
=0.1 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 ine ective with consequent
serious risks to persons (e.g. electric shock) and objects (e.g. re).
CONNECTION OF THE WELDING CABLES
WARNING! BEFORE
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 2 ) depending on the maximum current supplied by the 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
rst time by dismantling the nozzle and the contact tube to ease its exit.
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.
Fig. F
MAKING THE FOLLOWING
mixture.
2
Fig. G
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 tting (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- t 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 ow of shielding gas by means
of the pressure reducer.
NOTE: remember to shut the shielding gas o when you nish work.
- Switch the welder on and set the welding current by means of the
switches or rotary switch (if any).
- To start welding press the torch button.
- To adjust the welding parameters adjust the wire feed rate (where
provided) using the appropriate knob until even welding is obtained
(Fig. B-3).
SPOT WELDING FUNCTION (where provided)
- To change the welding time operate the adjustment knob (Fig. B-5).
WARNING:
- In some models the wireguide tip is normally live; take care to prevent
unwanted strikes.
- The indicator light comes on when there is overheating and cuts o
the power supply; it will reset automatically within a few minutes, after
cooling down.
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Fig. I
Fig. L