Manual Telwin PRATICA 152 TURBO (page 6 of 84) (All languages)

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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

: maximum no-load voltage (open welding circuit).

- I

: 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

:Alternating voltage and power supply frequency of welding

machine (allowed limit ±10%):

- I

max

: Maximum current absorbed by the line.

- I

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

: 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

) 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

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Telwin PRATICA 152 TURBO Manual

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