Telwin 350 Bedienungsanleitung Seite 7

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Unpack the welding machine, assemble the separate parts contained in the package.
one of the welding machines described in this manual are equipped with a lifting
device.
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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- 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 comply with the requirements of the E
recommend connecting the welding machine to interface points of the power supply
that have an impedance of less than Zmax 0.02ohm.
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Connect a normalised plug
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. The table 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.
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To carry out voltage change operations only the three 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.
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Table 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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Gas bottle can be loaded on welding machine bottle support platform: max 60 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 mixture.
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- 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.
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- welding current cable to quick connection
- control cable to appropriate connector.
- Make sure the connectors are firmly tightened in order to prevent overheating and
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61000-3-11 Flicker standard we
having sufficient capacity to the power cable and
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loss of efficiency.
- Connect the gas pipe from the pressure-reducing valve on the bottle and lock it with
the clip supplied.
- 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 - .
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- 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
tip to ease its exit.
- Turn the welding cable connectors right down into the quick connections if present ,
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to ensure a perfect electrical contact; otherwise the connectors themselves will
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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.
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- Remove the top cover from the welding machine 1 .
- Insert the G.R.A. 2 .
- Attach the G.R.A. to the back using the screws supplied.
- Close the top cover on the welding machine 3 .
- Connect the G.R.A. to the welding machine using the cable supplied.
- Connect the water pipes to the quick-release couplings.
- Switch on the G.R.A. following the procedure described in the handbook supplied
with the cooling unit.
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MAKE SURE THAT THE WIRE FEEDER ROLLERS, THE WIRE GUIDE HOSE A D
THE CO TACT TIP OF THE TORCH MATCH THE DIAMETER A D T PE OF WIRE
TO BE USED A D MAKE SURE THAT THESE ARE FITTED CORRECTL . WHE
I SERTI G A D THREADI G THE WIRE DO OT WEAR PROTECTIVE GLOVES.
- 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 1 .
- Release the pressure counter-rollers and move them away from the lower rollers
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- Make sure that the towing rollers is suited to the wire used
- 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
- Re-position the counter-rollers, adjusting the pressure to an intermediate value, and
make sure that the wire is correctly positioned in the groove of the lower rollers
- Use the adjustment screw located at the centre of the spindle to apply a slight braking
pressure on the spindle itself 1 .
- Remove the nozzle and contact tip 4 .
- 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.
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- 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 4 .
- 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.
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- Cut the end of the wire so that 10-15 mm protrude from the nozzle.
- Close the wire feeder door.
Before proceeding to replace the hose, lay out the torch cable straight without any
bends.
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1 Unscrew the nozzle and contact tip on the torch head.
Unscrew the hose locking nut on the central connector and remove the old hose.
Insert the new hose into the cable-torch duct and push it gently until it comes out of
the torch head.
4 Tighten up the hose locking nut by hand.
Trim off all the excess protruding hose pressing it slightly; remove it from the torch
cable again.
Smooth the part where the hose was cut and reinsert it into the cable-torch duct.
Tighten up the nut again using a spanner.
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