7
- Make sure that the welding machine is switched off and the
plug is not in the power socket before carryng out this
procedure.
- Make sure that the power socket that the welding machine is
plugged into is protected by safety devices (fuses or automatic
switch) and grounded.
Assembly and electrical connections
- Check that the electrical supply delivers the voltage and
frequency corresponding to the welding machine and that it is
fitted with a delayed fuse suited to the maximum delivered
rating current (I2max)
Fig.3
-
Plug
. If the welding machine is not fitted with a plug, fit a
normalised plug (
2P+ T for 1Ph
) of suitable capacity to the
power cable
Fig.3
.
Connecting to motor generators
- Some welding machines may be powered by a motor
generator. Make sure that this as a power of at least 6 KVA
and does not deliver a voltage greater than 270V.
Preparing the welding circuit MMA
- Connect the ground lead** to the welding machine and to the
piece to be welded, as close as possible to the point to be
welded.
- Connect the cable with electrode holder gripper** to the
welding machine and mount the electrode on the gripper.
Refer to the electrode manufacturer’s instructions concerning
connection and welding current.
- In welding machines that deliver direct current, most of the
electrode are connected to the positive attachment, and only
some electrodes (such as Rutile coated ones) are connected
to the negative attachment.
Preparing the welding circuit TIG
- Connect the ground lead** to the welding machine and to the
piece to be welded, as close as possible to the point to be
welded.
- Connect the TIG torch power connector to the negative
attachment of the welding machine and mount the electrode.
The torch must be fitted with a gas flow adjustment valve.
- Connect the TIG torch gas pipe to the output of the pressure
reducer mounted on an ARGON protection gas cylinder.
- The reccomended sections (mm2) of the welding cable, based
on the maximum delivered rated current (I2 max), are shown in
Fig.3
.
** (Thi component may be not included with some models).
Once you have put the welding machine into operation, switch it
on and carry out the required adjustments.
CEL, BAS, TIG ** selector
Select the welding process to be used:
BAS: welding with coated electrode.
CEL: welding with cellulose-coated electrode, suited
to welding high-pressure tanks and piping.
TIG: TIG welding
Adjusting the welding current
Select the welding current depending on the electrode, the joint
and the welding position.
Indicatively, the current to be used with the different electrode
diameter are listed in
Fig.4
- To strike the welding arc with the coated electrode, brush it
onto the piece to be welded and as soon as the arc is struck,
hold it costantly at a distance equal to the electrode diameter and
at the angle of approximately 20-30 degrees in the direction in
which you are welding.
The welding machine is a current transformer for manual arc
welding using MMA coated and TIG electrodes with a torch that
strikes the arc on contact.
The welding machine is built using electronic
INVERTER
technology.
The delivered current is direct DC (+ -).
The electrical characteristic of the transformer is of the falling
type.
This manual refers to a range of welding machine that differ in
some of their characteristics.
Identify your model in
Fig.1
.
Main parts Fig.1
A)
Power cable
B)
On/Off switch
C)
Welding current adjustment
D)
CEL/BAS/TIG selector
E)
ARC FORCE adjustment
F)
Thermal cutout signal
G)
Power supply indicator
H)
Fault warning light
I)
Coupling for welding cables (some welding machine have
directly connected cables)
A data plate is affixed to the welding machine
Fig.2
shows an
example of this plate.
A)
Constructor name and address
B)
Symbol of the welding machine internal structure
C)
Symbol of the foreseen welding process
MMA welding;
TIG welding
Symbol of the delivered current:
continuous
D)
Symbol indicating the possibility to use weldig machine
in environments potentially subject to electric discharge
E)
Power supply requirements:
1
alternate single phase voltage;
Hz
frequency
from electrical power supply;
from
motorgenerator
F)
Level of protection from solids and liquids
G)
Power supply data:
U1
Input voltage (permitted tolerance: +/- 10%)
I1 eff
Effective absorbed current
I1 max
Maximum absorbed current
H)
Welding circuit performance:
U0V
Minimum and maxinun open circuit voltage (open weldig
circuit).
I2, U2
Current and corresponding normalised voltage
delivered by the machine.
X
Duty cycle. Indicate how long it must rest for in order to
cool down. The time is expressed in % on the basis of a
10 minute cycle (e.g. 60% means 6 min. work and 4 min.
rest).
A / V
Current adjustment field and corresponding arc voltage.
I)
European reference standard for the construction and safety
of welding equipment.
J)
Serial number.
K)
Safety symbols:
Refer to safety warnings.
L)
Weight
- Connections to the mains must be made by expert or qualified
personnel.
Description of the welding machine
Technical data
~
S
Starting up
Welding process: description of
controls and signals
i
i
i
WARNING: This equipment does not comply with IEC 61000-3-12.
If it is connected to a public low voltage system, it is the
responsibility of the installer or user of the equipment to ensure, by
consultation with the distribution network operator if necessary,
that the equipment may be connected.
