Deca DE140 Manuel D'instruction page 8

circuit touches the ground or earth circuits: accidental contact could cause overheating
or trigger a fire.
EMF Electromagnetic Fields
Welding current creates electromagnetic fields (EMF) near the welding circuits and
the welder. Electromagnetic fields may interfere with medical prostheses such as
pacemakers.
Suitable and sufficient measures should be implemented to protect those operators
having such aids. For instance, they should not be allowed to enter that area where
welding equipment is used. Any operator having such aids should consult their doctor
before coming close to an area where welding equipment is used.
This device meets the specific requirements of the product technical standard and is
intended for professional use in an industrial environment only. Compliance to expected
limits for human exposure to electromagnetic fields at home is not ensured.
Follow these strategies to minimise exposure to electromagnetic fields (EMF):
„ Do not place your body between the welding cables. Both welding cables should be on
the same side of your body.
„ Twist both welding cables together and secure them with tape when possible.
„ Do not wrap the welding cables around your body.
„ Connect the earth cable to the workpiece as close as possible to the area to be welded.
„ Do not work with the welder hanging from your body.
„ Keep your head and trunk as far as possible from the welding circuit. Do not work close to
the welder, or seated or leaning on it. Minimum distance: Fig 9 Da = cm 50; Db = cm.20
Class A equipment
This equipment has been designed to be used in professional and industrial environments.
If this equipment is used in domestic environments and those directly connected to a
low voltage power supply network which supplies buildings used for domestic purposes,
it may be difficult to ensure compliance to electromagnetic compatibility as the result of
conducted or radiated disturbances.
Welding (cutting) in conditions of risk
„ IIf you are required to work in conditions of risk (electric discharges, suffocation, the
presence of inflammable or explosive materials), make sure that an authorised expert
evaluates the conditions beforehand. Make sure that trained people are present who
can intervene in the event of an emergency. Use the protective equipment described in
5.10; A.7; A.9 of the IEC or CLC/TS 62081 technical specification.
„ If you are required to work in a position raised above ground level, always use a safety
platform.
„ If more than one machine has to be used on the same piece, or in any case on pieces
connected electrically, the sum of the no-load voltages on the electrode holders or on
the torches may exceed the safety levels. Make sure that an authorised expert evaluates
the conditions beforehand to see if such risk exists and adopt the protective measures
described in 5.9 of the IEC or CLC/TS 62081 technical specification if required.
Additional warnings
„ Do not use the machine for purposes other than those described, for example to thaw
frozen water pipes.
„ Place the machine on a flat stable surface, and make sure that it cannot move. It must
be positioned in such a way as to allow it to be controlled during use but without the risk
of being covered with sparks.
„ Do not lift the machine. No lifting devices are fitted on the machine.
„ Do not use cables with damaged insulation or loose connections.
„ Connections to the mains must be made by expert or qualified personnel.
„ Make sure that the machine is switched off and disconnected from mains before carrying
out this procedure.
„ Make sure that the power socket that the machine is plugged into is protected by safety
devices (fuses or automatic switch) and grounded.
„ The device must be connected only to a supply system, with an earthed 'neutral' lead.
Recommendations for use
„ Only use an extension lead when absolutely necessary and providing it has an equal or
larger section to the power cable and is fitted with a grounding conductor.
„ Do not block the machine air intakes. Do not store the machine in containers or on
shelving that does not guarantee suitable ventilation.
„ Do not use the machine in any environment in the presence of gas, vapours, conductive
powders (e.g. iron shavings), brackish air, caustic fumes or other agents that could
damage the metal parts and electrical insulation.
L
The electric parts of the machine have been treated with protective resins. When
used for the first time, smoke may be noticed; this is caused by the resin drying out
completely. The smoke should only last for a few minutes.
Description of the welding machine
The welding machine is a current generator for continuous wire welding, commonly
known as MIG / MAG, suited to welding carbon or light alloy steels, stainless steel and
aluminium using protective gas.
The electrical characteristic of the transformer is flat (constant voltage).
The welding machine is a current transformer for manual arc welding using MMA coated
electrodes and TIG with a torch that strikes the arc on contact.
The delivered current is direct.
The electrical characteristic of the transformer is of the falling type.
The welding machine is built using electronic INVERTER technology.
This manual refers to a range of welding machines that differ in some of their
characteristics. Identify your model in Fig. 1.
950694-00 05/07/19
Starting up
Main parts Fig. 1
A) Spool compartment access door
B) Spool holder reel
C) Wire feeder
D) Power cable
E) Gas hose connection
F) ON/OFF switch
G) Torch connector
H) Couplings for welding cables.
I) Voltage change terminal board
Technical data
A data plate is affixed to the welding machine. Fig. 2 shows an example of this plate.
A) Constructor name and address
B) European reference standard for the construction and safety of welding
equipment
C) Symbol of the welding machine internal structure
D) Symbol of the foreseen welding process: D1: MIG; D2: TIG; D3 MMA.
E) Symbol of the continuous current delivered
F) Input power required:
1˜ alternate single phase voltage, frequency
G) Level of protection from solids and liquids
H) Symbol indicating the possibility to use the welding machine in environments
potentially subject to electric discharges
I) Welding circuit performance
U0V Minimum and maximum open circuit voltage (open welding circuit).
I2, U2 Current and corresponding normalised voltage delivered by the welding
machine.
X Duty cycle. Indicate how long the welding machine can work for and 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.
J) Power supply data
U1 Input voltage (permitted tolerance: +/- 10%)
I1 eff Effective absorbed current
I1 max Maximum absorbed current
K) Serial number
L) Weight
M) Safety symbols: Refer to Safety Warnings
Technical data for torch and wire feeder Fig.7
Assembly and electrical connections
¾ Assembly the detached parts found in the packaging.
¾ Check that the electrical supply delivers the voltage and frequency corresponding to
the welding machine and that it is fitted with an automatic switch suited to the maximum
delivered rated current (I2max) Fig. 6,1.
L
The requirements set out in the IEC/EN61000-3-12 standard do not apply to this
equipment. If this equipment is connected to low voltage power supply network, either
the installer or the user is responsible for checking that this can be done (consult the
distribution system operator if required).
L
In order to comply with the requirements set out in the EN61000-3-11 (Flicker) standard,
it is advisable to connect the welder to the supply network interface points having an
impedance lower than the reference Zmax = Fig.6,4.
¾ Power plug. The effective absorbed current "I1 eff" is indicated on the technical plate of
the welding machine, when it is used at maximum power. Connect the welding machine to
a normalized plug (2P+T per 1Ph) of capacity sufficient to deliver maximum power. Fig 6,2.
If a 16A plug is connected to the welding machine, follow the instructions in Fig.6.
Preparing the welding circuit MIG
¾ 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.
**
¾ Connect the torch to the welding machine socket. Select the polarity of the torch**.
For selection follow the instructions in Fig.3 .
Installing the continuous wire
For installation, follow the instructions in Fig. 4.
The material and diameter of the wire must correspond to the wire feeder roller, the
contact tip and the torch liner. If the measurements do not match, there may be problems
with the smooth running of the wire.
L
The pressure of the wire pressing knob is important for correct operation. If the wire
slips, there will be problems with the welding; if on the other hand it is too tight, it may
be deformed and will not run smoothly through the torch.
Installing the protective gas cylinder** and pressure reducer**
„ Place the protective gas cylinder in an upright position, far away from the welding area.
Use the welding machine support or some other fixed part so that there is no risk of it
falling or being damaged.
For installation, follow the instructions in Fig. 5.
Preparing the welding circuit MMA
¾ 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.
¾ Connect the cable with the 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.
7
Starting up