Deca MASTROTIG 327 AC/DC [9/72] Description of the welding machine
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Deca MASTROTIG 327 AC/DC [9/72] Description of the welding machine

Deca MASTROTIG 327 AC/DC [9/72] Description of the welding machine
8
950637-01 15/02/16
- Technical data for TIG torch** Fig.2,1
** (This component may not be included with some models).
Starting up
Connections to the mains must be made by expert or qualied personnel.
Make sure that the welding machine is switched off and the plug is not in the power
socket before carrying 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.
The device must be connected only to a supply system, with an earthed ‘neutral’ lead.
Assembly and electrical connections
¾ Assembly the detached parts found in the packaging (Fig.5).
¾ Check that the electrical supply delivers the voltage and frequency corresponding to the
welding machine and that it is tted with a delayed fuse suited to the maximum delivered
rated current (I2max) Fig. 3,1.
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 (Mod.1, Mod.2) In order to comply with the requirements set out in the EN61000-3-11
(Fliker) standard, it is advisable to connect the welder to the supply network interface
points having an impedance lower than the reference Zmax = Fig.3,4.
¾ Plug. If the welding machine is not tted with a plug, t a normalised plug (2P+ T per
1Ph) ( 3P+ T per 3Ph) of suitable capacity to the power cable Fig.3,2.
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.
L In welding machines that deliver direct current, most of the electrodes 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
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 TIG torch** power connector to the negative attachment on the welding
machine and mount the electrode.
¾ Connect the torch control connector into the connector “R” on the front panel.
¾ Connect the TIG torch gas hose to the gas tting “P” on the front panel.
L The recommended sections (mm2) of the welding cable, based on the maximum
delivered rated current (I2 max), are shown in Fig. 3,3.
Place the protective gas cylinder in an upright position, far away from the welding area.
Use the welding machine support or some other xed part so that there is no risk of it
falling or being damaged.
For installation, follow the instructions in Fig. 6.
L Non-rellable cylinders are equipped with a pin valve that opens automatically when
the pressure reducer is screwed onto the cylinder.
TIG torch (Mod. 3)** cooling system set-up
The socket “X” is the supply connection of your TIG torch cooling system
¾ When using a TIG air cooled torch, always plug the dummy connector supplied with
your unit into the socket.
Your welder will not start or will stop welding if the connector is not plugged into the
socket, or the coolant level is too low, or the cooling system is not switched on; the
display will show error “E16”
** (This component may not be included with some models).
Welding process: description of controls and signals
Once you have put the welding machine into operation, switch it on and carry out the
required adjustments.
¾ Set the welding mode by pressing buttons “E”. The options selected are signalled by
the lit LEDs next to the different symbols.
¾ Select each individual welding parameter by pressing buttons “F”. The welding parameter
to be modied is highlighted by a lit LED next to the symbol and its value is shown on
the display. Turn dial “G” to change the parameter value.
L Table 1 shows the unit of measurement and the eld to adjust the welding parameters.
D) Stand By / ON button
Press this button to switch on the machine or to set it to “Stand By”.
When the machine is connected to the mains in “Stand By” mode, a red light ashes on
the display.
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 difcult to ensure compliance to electromagnetic compatibility as the result of
conducted or radiated disturbances.
Welding in conditions of risk
If welding needs to be done in conditions of risk (electric discharges, suffocation, the
presence of inammable 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 specication.
If you are required to work in a position raised above ground level, always use a safety
platform.
If more than one welding 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 specication if required.
Additional warnings
Do not use the welding machine for purposes other than those described, for example
to thaw frozen water pipes.
Place the welding machine on a at 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 welding sparks.
Do not lift the welding machine. No lifting devices are tted on the machine.
Do not use cables with damaged insulation or loose connections.
Description of the welding machine
The machine is a current generator for manual metal arc welding (MMA, with coated
electrodes) and TIG welding with a torch suitable for both LIFT or HF arc striking.
The welding machine is built using electronic INVERTER technology.
The delivered current is direct or alternate.
The static output of the current generator is of a drooping type.
The electrical characteristic of the transformer is of the falling type.
This manual refers to a range of welding machines that differ in some of their characteristics.
Identify your model in Fig. 1.
Main parts Fig. 1
A) Power cable.
B) Connector for remote (foot pedal) control.
C) Gas hose connection.
D) Stand By/ON switch.
D) Welding current adjustment.
E) Buttons to select welding mode.
F) Buttons to select welding parameters.
G) Welding parameter adjustment dial.
H) Buttons to SAVE welding programs.
L) Remote (foot pedal) control connection pilot lamp.
M) Thermal cutout signal
O) Couplings for welding cables / torch coupling.
P) Torch welding gas tting.
R) TIG torch 3-pin socket.
X) Cooling system supply connector / (TIG Air key).
Z) Mains switch.
Technical data
A data plate is afxed 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: MMA welding; D2: TIG welding.
E) Symbol of delivered current: alternate; / direct.
F) Input power required: 1˜ alternate single phase voltage, frequency.
1˜ alternate single phase voltage, frequency.
3˜ alternate three 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 eld 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.

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