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Telwin PRATICA 151 Manual

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icing mains water pipes).
_______________(GB)_____________
- Do not use the handle to hang up the welding machine.
2. INTRODUCTION AND GENERAL DESCRIPTION
INSTRUCTION MANUAL
This apparatus is a power source for arc welding, made specifically for
alternating current (AC) MMA welding with coated electrodes.
STANDARD ACCESSORIES:
- electrode holder clamp;
WARNING: BEFORE USING THE MACHINE READ THE
- return cable and earth clamp.
INSTRUCTION MANUAL CAREFULLY!
3. TECHNICAL DATA
LIMITED SERVICE, MANUAL ARC WELDING MACHINES
DATA PLATE
FOR COATED ELECTRODES (MMA)
The most important data regarding use and performance of the
welding machine are summarised on the rating plate and have the
Note: In the following text the term “welding machine” will
following meaning:
be used.
Fig. A
1. GENERAL SAFETY CONSIDERATIONS FOR ARC
1 - EUROPEAN standard of reference for safety and construction of
WELDING
arc welding machines.
2 - Symbol : alternating welding current.
3 - Symbol : indicates that welding operations may be carried
- Avoid direct contact with the welding circuit: the no-load
voltage supplied by the welding machine can be dangerous
out in environments with heightened risk of electric shock (e.g.
under certain circumstances.
very close to large metallic volumes).
- When the welding cables are being connected or checks and
4 - Symbol for power supply line:
repairs are carried out the welding machine should be
1~: single phase alternating voltage.
switched off and disconnected from the power supply outlet.
- Switch off the welding machine and disconnect it from the
5 - Protection rating of the covering.
power supply outlet before replacing consumable torch parts.
6 - Symbol :protection class II.
- Make the electrical connections and installation according to
the safety rules and legislation in force.
7 - Technical specifications for power supply line:
- The welding machine should be connected only and
-U : Alternating voltage and power supply frequency of
1
exclusively to a power source with the neutral lead connected
welding machine (allowed limit ±10%).
to earth.
- Make sure that the power supply plug is correctly connected
-I : Maximum current absorbed by the line.
1 max
to the earth protection outlet.
-I : effective current supplied.
1 eff
- Do not use the welding machine in damp or wet places and do
8 - Performance of the welding circuit:
not weld in the rain.
-U : maximum no-load voltage (open welding circuit).
- Do not use cables with worn insulation or loose connections.
0
-Ø : diameter of weldable electrodes.
- I : welding current at the corresponding arc voltage.
2
-tw : Average load time calculated between thermal switch
- Do not weld on containers or piping that contains or has
reset and interruption with welding machine at steady
contained flammable liquid or gaseous products.
state.
- Do not operate on materials cleaned with chlorinated solvents
-tr : Average reset time calculated between thermal switch
or near such substances.
- Do not weld on containers under pressure.
interruption and reset with welding machine at steady
- Remove all flammable materials (e.g. wood, paper, rags etc.)
state.
from the working area.
-A/V-A/V : shows the range of adjustment for the welding current
- Provide adequate ventilation or facilities for the removal of
(minimum maximum) at the corresponding arc voltage.
welding fumes near the arc; a systematic approach is needed
9 - Manufacturer's serial number for welding machine identification
in evaluating the exposure limits for the welding fumes, which
will depend on their composition, concentration and the
(indispensable for technical assistance, requesting spare parts,
length of exposure itself.
discovering product origin).
10 - : Size of delayed action fuses to be used to protect the
power line.
,
*
11 - Symbols referring to safety regulations, whose meaning is given
- Use adequate electrical insulation with regard to the
in chapter 1 “General safety considerations for arc welding”.
electrode, the work piece and any (accessible) earthed metal
parts in the vicinity.
NOTE: The data plate shown above is an example to give the meaning
This is normally achieved by wearing gloves, shoes, head
of the symbols and numbers; the exact values of technical data for the
coverings and clothing designed for this purpose and by
welding machine in your possession must be checked directly on the
using insulating platforms or mats.
data plate of the welding machine itself.
- Always protect your eyes using masks or helmets with special
actinic glass.
OTHER TECHNICAL DATA
Use special fire-resistant protective clothing and do not allow
the skin to be exposed to the ultraviolet and infrared rays
- WELDING MACHINE: see table 1 (TAB.1)
produced by the arc; other people in the vicinity of the arc
should be protected by shields of non-reflecting curtains.
The welding machine weight is shown in table 1
(TAB. 1).
4. DESCRIPTION OF THE WELDING MACHINE
- The electromagnetic fields generated by the welding process
CONTROL, ADJUSTMENT AND CONNECTION DEVICES
may interfere with the operation of electrical and electronic
Fig. B
equipment.
Users of vital electrical or electronic devices (e.g. pace-
5. INSTALLATION
makers, respirators etc.) should consult a doctor before
WARNING!
stopping in the vicinity of areas where this welding machine is
used.
CARRY OUT ALL INSTALLATION OPERATIONS AND
Users of vital electrical or electronic devices should not use
ELECTRICAL CONNECTIONS WITH THE WELDING MACHINE
the welding machine.
COMPLETELY SWITCHED OFF AND DISCONNECTED FROM THE
POWER SUPPLY OUTLET.
THE ELECTRICAL CONNECTIONS MUST BE MADE ONLY AND
RESIDUAL RISKS
EXCLUSIVELY BY AUTHORISED OR QUALIFIED PERSONNEL.
- OVERTURNING: position the welding machine on a horizontal
Assembling the protective mask
surface that is able to support the weight: otherwise (e.g.
Fig. C
inclined or uneven floors etc.) there is danger of overturning.
- IMPROPER USE: it is hazardous to use the welding machine
for any work other than that for which it was designed (e.g. de-
WARNING! Position the welding machine on a flat surface
SS
- 3 -
3 …


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