Safety Rules - Telwin HF Serie Manual De Instrucciones

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INSTRUCTION MANUAL
WARNING:
BEFORE USING THE MACHINE READ THE
INSTRUCTION MANUAL CAREFULLY!

SAFETY RULES

- Avoid direct contact with the welding circuit, the no-load
voltage supplied by the generator can be dangerous.
- Unplug the mains before installing and before making
any check or repair operation.
- Accomplish mains connection according to general
safety rules.
- Disconnect the power supply before replacing torch
consumables.
- The welding machine should be connected only and
exclusively to a power source with the neutral lead
connected to earth.
- Make sure that the supply plug is correctly connected to
earth.
- Do not use the machine in damp or wet places and do
not weld in the rain.
- Do not use cables with worn insulation or loose
connections.
- Do not weld on containers or pipes which have held
flammable materials or gaseous or liquid combustibles.
- Avoid operating on materials cleaned with chlorinated
solvents or near such solvents.
- Do not weld on containers under pressure
- Remove from working area all flammable materials
(e.g.wood, paper, ...).
- Provide adequate ventilation or facilities for removal of
welding fumes.
- Keep the bottle away from heat sources, including direct
sunlight.
- Always protect your eyes with fitting glasses. Use proper
protective clothing and gloves and avoid exposing skin
to the ultraviolet rays produced by the arc.
- Do not use the machine to defrost the piping
- Place the machine on a level surface to prevent
overturning.
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GENERAL
This TIG model is a constant current rectifier for arc welding
controlled by a transistor bridge (IGBT) with
frequency of 32kHz.
The specific characteristics of this regulation system
(INVERTER) i.e. high speed and precise regulation, ensure
a high quality result with both stick electrode and TIG
welding (D.C.).
The "inverter" system, regulated at the input of the primary
mains, also allows for a drastic reduction in the volumes of
both the transformer and the reactance. This reduction in
volume and weight enhances the mobility of the machine.
The unit is comprised of power modules which have been
developed on a specially printed circuit designed to
maximise reliability and reduce maintainance.
DESCRIPTION :
1 - Mains input (single phase), rectifier unit and condenser.
2 - Transistors and drivers switching bridge (IGBT).
It turns the mains rectified voltage into high frequency
alternate voltage
(32 kHz) and permits power regulation according to the
current/
voltage of the weld to be done.
3 - High frequency transformer:
The primary windings are fed by the voltage converted
by Block 2, it has
the function of adapting voltage and current to the
values required by the arc
welding procedure and, simultaneously, isolates the
welding circuit from
the mains.
4 - Secondary rectifier bridge with inductance:
this changes the alternate voltage/current supplied by
the secondary windings
into continuous current/voltage at a low wave-length.
5 - Electronic and regulation board:
this instantly checks the value of the welding current
against that selected by the user, it modulates the
commands of the IGBT drivers, which control
Regulation.
The control board also determines the dynamic
response of the current transient during the phases of
electrode fusion (instant short circuit), and is
responsible
for the safety system.
6 - Analogue regulations: Timers, slope and buffers.
7 - Digital controls in / out actuators.
8 - HF striking generator
9 - Protective gas electrovalve
10 - Remote regulation or TIG Pulse Control
CONNECTION, REGULATION, AND SIGNALLING
DEVICES
Back panel
1 - mains cable 2p + ( ).
2 - General luminous switch O/OFF - I/ON
3 - Remote regulators connector (v. OPTIONS)
4- Pipe fitting for gas tube connection (gas regulator
cylinder - machine).
11
normal
Fig. A
Fig. B