Installation Site; Connection To Mains; Mma Welding - Telwin HF Serie Manual De Instrucciones

the vertical.
7 -Performance of welding circuit:
- U : maximum peak no-load voltage (welding circuit
0
open).
- I /U : current and corresponding normalised voltage
2 2
[U2 = (20+0.04 I2) V] that the machine can deliver during
welding.
- X: Duty cycle: indicates the time for which the machine
can deliver the corresponding current (same column).
Expressed in %,on the basis of a 10min cycle (e.g.
60% = 6 minutes work, 4 minutes wait; and so on).
- A/V-A/V: Indicates the welding current adjustment
range (minimum - maximum) at the corresponding arc
voltage.
8- Technical specifications for power supply line:
- U : Alternating voltage and power supply frequency of
1
machine (limit allowed ±15%):
- I : Maximum current consumed by the line.
1max
- I : maximum effective current consumed
1eff
Value of delayed action fuses to be used to
9-
protect the power line.
- Symbols referring to safety standards
10- Manufacturer's serial number. Machine identification
(indispensable for technical assistance, requesting
spare parts, discovering product origin).
Note: The plate example given shows the meaning of
the symbols and figures; the exact rating values for the
machine in your possession should be read directly on
the rating plate of the machine it self.
INSTALLATION
SITE
Locate the machine in an area where openings for cooling
air are not obstructed (forced circulation with fan); check that
conductive dusts, corrosive vapours, humidity etc., will not
enter machine.

CONNECTION TO MAINS

- Before making any electrical connection check that the
technical data (on machine's back panel) corresponds
to the voltage and frequency of the mains at the

installation site.

PLUG:
- It is necessary to connect the terminals of the mains
cable to a standardized 2P plug +
20 ÷ 25A. PA Y THE UTMOST ATTENTION that the
yellow/green conductor of the cable is correctly
connected to the terminal of the plug
- The mains must be protected with delayed fuses or an
automatic differential switch, for the correct dimensions
of the mains (power/current fuse capacity), refer to data
on machine's identification plate.
WARNING
Failure to observe the above rules will make ineffective the
safety system installed by the manufacturer (Class 1) with
resulting risks for persons (eg. electric shock) and objects
(eg. Fires).
CONNECTION OF THE WELDING CABLES
ALL CONNECTIONS TO THE WELDING CIRCUIT MUST
BE CARRIED OUT WITH THE MACHINE STRICTL Y
ISOLATED FROM THE MAINS.
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with capacity of
.
TIG WELDING WITH DIRECT CURRENT:
- "TIG" torch : the torch cable must be connected to the
correct pole (-); Connect then the three pole connector
(torch pushbutton) pushing properly and rotating it
clockwise; connect the gas tube to the suitable
connection, tightening it carefully and manually, avoid
the use of wrenches.
- Work cable: it must be connected to the pole (+); the
work clamp, at the other end, is to be connected to the
workpiece to be welded or to a metallic board, as close
as possible to the joint.
Warning:
- Connecting cables must be turned fully into the quick
plugs to ensure a good electrical contact, loose
connections will cause overheating, rapid deterioration
and loss in efficiency.
- Avoid using welding cables of length over 10m.
- Avoid using 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.

MMA WELDING

- Welding cable - electrode holder: this is normally
connected to the positive pole (+), (see paragraph
'welding'').
- Return cable - work: this is normally connected to the
negative pole (-) the work clamp, at the opposite end,
must be connected to the work piece or a metallic work
bench, AS CLOSE AS POSSIBLE TO THE JOINT TO BE
MADE.
PROTECTIVE GAS CYLINDER CONNECTION (Argon
99,5%)
Screw the pressure reducer to the valve of the argon
cylinder.
Set the flexible tube for the protective gas supply ,
connecting it on one side to the relevant output connection
of the pressure reducer and on the other to the connection
placed on the rear of the machine, ensuring tightening with
the correct bands.
Loosen the regulating ring nut of the pressure reducer
before opening the cylinder valve.
Open the cylinder and set the quantity of gas (l/m) according
to the welding parameters (see table). If necessary gasflow
may be adjusted during welding using the regulating ring nut
of the pressure reducer.
Check seal of all tubing and connections.
TIG WELDING WITH DIRECT CURRENT
General rules
TIG welding procedure uses the heat produced by the
electrical arc established and maintained between a
consumable electrode (Tungsten) and the workpiece. The
Tungsten electrode is held by a torch which transmits the
welding current. The torch is adapted to protect the
electrode and the weld pool from oxidation by a stream of
inert gas (usually Argon: Ar 99,5) from the ceramic nozzle.
On prepared thin thicknesses (up to 1mm ca.) welding may
be done without the filler rod, by the fusion of the edges of
the joint.
Welding with turned edges Fig. G
13
Fig. F