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Telwin PRATICA 152 TURBO Seite 6

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- Do not use the handle to hang the welding machine.
2. INTRODUCTION AND GENERAL DESCRIPTION
This apparatus is a power source for arc welding, made specically
for alternating current (AC) MMA welding with coated electrodes.
STANDARDACCESSORIES:
- electrode holder clamp;
- return cable and earth clamp.
3. TECHNICAL DATA
DATA PLATE
The most important data regarding use and performance of the
welding machine are summarised on the rating plate and have the
following meaning:
Fig. A
1- Protection rating of the covering.
2- Symbol for power supply line:
1~: single phase alternating voltage.
3- Symbol for welding procedure provided.
4- Symbol for internal structure of the welding machine.
5- EUROPEAN standard of reference, for safety and construction
of arc welding machines.
6- Manufacturer’s serial number for welding machine identication
(indispensable for technical assistance, requesting spare parts,
discovering product origin).
7- Symbol S: indicates that welding operations may be carried out
in environments with heightened risk of electric shock (e.g. very
close to large metallic volumes).
8- Performance of the welding circuit:
- U
0
: maximum no-load voltage (open welding circuit).
- I
2
/U
2
: current and corresponding normalised voltage that the
welding machine can supply during welding.
- X : Duty cycle: indicates the time for which the welding
machine can supply the corresponding current (same column).
It is expressed as %, based on a 10 min. cycle (e.g. 60% = 6
minutes working, 4 minutes pause, and so on).
If the usage factors (on the plate, referring to a 40°C
environment) are exceeded, the thermal safeguard will
trigger (the welding machine will remain in stand-by until its
temperature returns within the allowed limits).
- A/V-A/V : shows the range of adjustment for the welding
current (minimum-maximum) at the corresponding arc voltage.
9- Technical specications for power supply line:
- U
1
:Alternating voltage and power supply frequency of welding
machine (allowed limit ±10%):
- I
1
max
: Maximum current absorbed by the line.
- I
1
eff
: effective current supplied.
10-
:Size of delayed action fuses to be used to protect the
power line.
11- Symbols referring to safety regulations, whose meaning is given
in chapter 1 “General safety considerations for arc welding”.
Note: The data plate shown above is an example to give the meaning
of the symbols and numbers; the exact values of technical data for
the welding machine in your possession must be checked directly on
the data plate of the welding machine itself.
OTHER TECHNICAL DATA
- Performance of the welding circuit in function of the diameter
oftheelectrode(Fig.A-12):
- Ø: diameter of weldable electrodes.
- I
2
: welding current at the corresponding arc voltage.
- tw: Average load time calculated between thermal switch reset
and interruption with welding machine at steady state.
- tr : Average reset time calculated between thermal switch
interruption and reset with welding machine at steady state.
- WELDINGMACHINE:seetable1(TAB.1)
The welding machine weight is shown in table 1 (TAB. 1).
4.DESCRIPTIONOFTHEWELDINGMACHINE
CONTROL, ADJUSTMENT AND CONNECTION DEVICES
Fig. B
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.
Assemblingtheprotectivemask
Fig. C
POSITIONINGTHEWELDINGMACHINE
Choose the place where the welding machine is to be installed so
that there are no obstructions to the cooling air inlets and outlets; at
the same time make sure that conductive dust, corrosive vapours,
humidity etc. cannot be drawn into the machine.
Leave at least 250 mm of free space all around the welding machine.
WARNING! Position the welding machine on a level
surfacewithsufcientload-bearingcapacity,sothat itcannot
betippedoverorshiftdangerously.
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;
- To comply with the requirements of the EN 61000-3-11 (Flicker)
standard we recommend connecting the welding machine to
interface points of the power supply that have an impedance of
less than Zmax =0.3 ohm.
- The welding machine falls within the requisites of IEC/EN 61000-3-
12 standard.
Plug and outlet
Connect the power supply plug to a mains socket tted with fuses or
an automatic circuit-breaker; the corresponding earth terminal should
be connected to the (yellow-green) earth conductor of the power
supply. Table 1 (TAB. 1) shows the recommended delayed fuse sizes,
in amps, for the main supply, which have been chosen according to
the maximum rated current output from the welding machine, and to
the nominal power supply voltage.
WARNING!Non-compliancewiththeaboveregulations
renders the manufacturer’s safety system(class I) inefcient,
with resulting serious risks to people (e.g. electric shock) and
things(e.g.re).
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 1 (TAB. 1) gives the recommended values for the welding
cables (in mm
2
) depending on the maximum current supplied by the
welding machine.
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.
For welding machines supplied with a terminal, 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. For welding
machines supplied with a terminal, the cable is connected to the
terminal with the symbol
.
Recommendations:
- Screw the welding cable connectors right down into the quick
… 6 …

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