Safety Rules - Telwin TECHNOLOGY 170 Manual De Instrucciones

- Contrôler qu'il n'y a pas un court-circuit en sortie de
machine. Si tel est le cas, procéder à l'élimination de
l'inconvénient.
- Les raccords du circuit de soudage soient correctement
effectués, spécialement que la pince du câble de masse
soit effectivement reliée à la pièce, sans interposition de
matériaux isolants (par exemple des peintures).
____________(GB)____________
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.
- 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.
GENERAL
This 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.
DIAGRAM
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 m o d u l a t e s t h e
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.
CONNECTION, REGULATION, AND SIGNALLING
DEVICES
Back panel
1 - mains cable with E.E.C. 2p plug + ( ).
Cable of models 170 and 200 is without plug.
2 - General luminous switch O/OFF - I/ON
Front Panel
1 - Positive quick plug (+) to connect welding cable
2 - Negative quick plug (-) to connect welding cable
3 - Potentiometer to regulate welding current with
graduated scale in Amps, which also allows regulation
during welding.
4 - Yellow led: normally off, when ON it means that the
welding current cannot flow due to one of the following
faults:
- Thermal protection:
- 7 -
Fig. A
Fig. B
Fig. C
inside the machine the
normal