Telwin SUPERIOR TIG 251 DC-HF/LIFT VRD 400V + TIG ACC (816116) Инструкция по эксплуатации онлайн [8/148] 331524

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 5c MAINCURRENT(I

)

When in TIG mode, MMA represents the output current I

. The parameter is

measured in Amperes.

 5d ARCFORCE

When in the MMA mode, this is the dynamic “ARC-FORCE” overcurrent

(adjustment 0 ÷ 100%); the display shows the percentage increase as to

the value of the pre-selected welding current. This setting improves welding

uidity and prevents the electrode from sticking to the metal piece.

6- Parameter setting (5) encoder knob and parameter selection key (5).

7- Alphanumeric display.

8- REMOTE CONTROL LED. Used to transfer control of the welding parameters to

the remote control.

9- ALARM signalling LED (the machine is blocked).

Resetting is automatic when the reason for alarm activation stops.

Alarm messages shown on the display (7) FIG. D1:

- “AL.1” : the primary circuit protection thermal switch has been triggered (if

installed).

- “AL.2” : the secondary circuit protection thermal switch has been triggered

- “AL.3” : power line overvoltage protection has been triggered

- “AL.4” : power line undervoltage protection has been triggered

- “AL.8” : auxiliary voltage out of range

10- Green LED, power ON.

4.3G.R.A.watercoolingunitENABLING and DISABLING instructions(where

applicable)

Enablingprocedure:

1- Press the main switch (1) simultaneously with the right button on the front panel

(6a) to turn the machine on.

2- The code "G.r.a - OFF" will appear on the display after the machine is turned on

(factory settings: cooling unit disabled).

3- Turn the encoder knob (9) until the code "G.r.a - on" appears on the display.

4- Press the encoder button (9) once to conrm the selection.

The cooling unit is now enabled.

Disablingprocedure:

Repeat the same sequence conrming the code "G.r.a. - OFF" to disable the unit.

NB: If the welding machine is set to "G.r.a. - on" mode, but no cooling unit has been

connected, the cooling circuit malfunction protection will be triggered after a couple of

seconds of operation (code "AL.9").

5.INSTALLATION

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.

5.1PREPARATION

Unpack the welding machine, assemble the separate parts contained in the package.

5.1.1Assemblingthereturncable-clamp(FIG.E)

5.1.2Assemblingtheweldingcable-electrodeholderclamp(FIG.E)

5.2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.

WARNING! Position the welding machine on a at surface with

sufcientcarryingcapacityforitsweight,topreventitfromtippingormoving

hazardously.

5.3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.

- In order to satisfy the requirements of the EN 61000-3-11 (Flicker) standard we

recommend connecting the welding machine to the interface points of the main

power supply that have an impedance of less than:

Zmax = 0.234 Ohm (3P+T 230V)

Zmax = 0.286 Ohm (3P+T 400V)

Zmax = 0.234 Ohm (1/N/PE 230V) 200A AC/DC

Zmax = 0.218 Ohm (1/N/PE 230V) 220A DC

- The IEC/EN 61000-3-12 Standard does not apply to the welding machine.

If the welding machine is connected to an electrical grid, the installer or user must

make sure that the machine can indeed be connected (if necessary, consult the

company that manages the electrical grid).

5.3.1Plugandoutlet

Connect a normalised plug (2P + P.E) (1~); (3P + P.E) (3~) - having sufcient capacity-

to the power cable and prepare a mains outlet tted 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.

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.re).

5.4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 (TAB. 1) gives the recommended values for the welding cables (in mm

)

depending on the maximum current supplied by the welding machine.

5.4.1TIGwelding

Connectingthetorch

- Insert the torch current cable into the appropriate quick terminal (-)/~. Connect the

three-pin connector (torch button) to the appropriate socket. Connect the torch gas

pipe to the appropriate connector.

Connectingtheweldingcurrentreturncable

- This is connected to the piece to be welded or to the metal bench on which it rests,

as close as possible to the joint being made.

This cable is connected to the terminal with the (+) symbol (~ for TIG machines

designed for AC welding).

Connectingthegasbottle

- Screw the pressure reducing valve to the gas bottle valve, rst inserting the special

reduction accessory supplied when argon gas is used.

- Connect the gas inow hose to the pressure reducing valve and tighten the hose

clamp supplied.

- Loosen the ringnut for adjusting the pressure reducing valve before opening the

valve on the bottle.

- Open the valve on the bottle and adjust the quantity of gas (l/min) according to the

suggestions for use given in the table (TAB.4); if it is necessary to adjust the gas

ow during welding this should always be done by adjusting the ring nut on the

pressure reduction valve. Make sure there are no leaks in the piping and connectors.

 WARNING!Alwaysclosethegasbottlevalveattheendofthejob.

5.4.2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 efciency.

- 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

6.1TIGWELDING

TIG welding is a welding procedure that exploits the heat produced by the electric arc

that is struck, and maintained, between a non-consumable electrode (tungsten) and

the piece to be welded. The tungsten electrode is supported by a torch suitable for

transmitting the welding current to it and protecting the electrode itself and the weld

pool from atmospheric oxidation, by the ow of an inert gas (usually argon: Ar 99.5)

which ows out of the ceramic nozzle (FIG.G).

To achieve a good weld it is absolutely necessary to use the exact electrode diameter

with the exact current, see the table (TAB.3).

The table on the covering of the machine suggests the approximate current values to

use in the various material thicknesses with reference to DC welding of mild steel or

stainless steel.

The electrode usually protrudes from the ceramic nozzle by 2-3mm, but this may

reach 8mm for corner welding.

Welding is achieved by fusion of the edges of the joint. For properly prepared thin

pieces (up to about 1mm) weld material is not needed (FIG.H).

For thicker pieces it is necessary to use ller rods of the same composition as the base

material and with an appropriate diameter, preparing the edges correctly (FIG.I). To

achieve a good weld the pieces should be carefully cleaned and free of oxidation, oil,

grease, solvents etc.

6.1.1HFandLIFTstrike

HFstrike:

The electric arc is struck without contact between the tungsten electrode and the piece

being welded, by means of a spark generated by a high frequency device. This strike

mode does not entail either tungsten inclusions in the weld pool or electrode wear and

gives an easy start in all welding positions.

Procedure:

Press the torch button, bringing the tip of the electrode close to the piece (2 -3mm),

wait for the arc strike transferred by the HF pulses and, when the arch has struck, form

the weld pool on the piece and proceed along the joint.

If there are difculties in striking the arc even though the presence of gas is conrmed

and the HF discharges are visible, do not insist for long in subjecting the electrode to

HF action, but check the integrity of the surface and the shape of the tip, dressing it

on the grinding wheel if necessary. At the end of the cycle the current will fall at the

slope down setting.

Telwin SUPERIOR TIG 251 DC-HF/LIFT VRD 400V + TIG ACC (816116) Инструкция по эксплуатации онлайн [8/148] 331524

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