Deca MASTROTIG 327 AC/DC [10/72] Maintenance

Deca MASTROTIG 327 AC/DC [10/72] Maintenance
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950637-01 15/02/16
E1) MMA, TIG LIFT, TIG HF selector
Press it to select the desired welding process:
¾ MMA: welding with coated electrode.
¾ TIG LIFT: TIG welding with LIFT ARC striking.
¾ TIG HF: TIG welding with high frequency arc striking
L 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 constantly at a distance equal to the
electrode diameter and at an angle of approximately 20 - 30 degrees in the direction
in which you are welding.
L To strike the welding arc with the TIG torch in TIG LIFT mode, make sure that the
protection gas valve is open.Keep the electrode in contact with the workpiece, press
the torch trigger and lift the tip of the electrode from the workpiece.
L To strike the welding arc in TIG HF mode, make sure that the protection gas valve is
open. Stay with the electrode tip at a distance of 5mm from the workpiece and press the
torch trigger: the arc will strike without need for the electrode to touch the workpiece.
E2) DC / AC / AC EASY selector
¾ “DC”: TIG welding, direct current.
¾ “AC”: TIG welding, alternating current. FREQUENCY (Hz) and BALANCE (%) are
adjusted manually.
¾ AC EASY”: TIG welding, alternating current. FREQUENCY (Hz) and BALANCE (%)
are automatically adjusted depending on the welding parameters set.
L When the machine is in “Easy” mode, the LED next to the welding parameters ashes
to show that the value seen in the display corresponds to the parameter chosen
automatically by the machine. If the value is changed, the LED becomes steady.
E3) TIG 2T / TIG 4T / SPOT selector
¾ 2T (manual): press and keep the torch trigger pressed to weld, the weld will stop as
soon as the button is released
¾ 4T (automatic): press and release the torch trigger to start welding, the weld will last
until the trigger is pressed and released once again.
¾ SPOT” TIG welding nishes automatically once the pre-set time has elapsed.
E4) PULSE / EASY PULSE / BILEVEL selector
¾ PULSE (TIG)The welding current is pulsed. Main current “I (Amp)” and base current
(%) I” alternate.
PULSE frequency, “PULSE (Hz)”, and base current “(%) I” are adjusted manually.
L The duration of the welding time at the main current is the same as the welding time
at the base current.
¾ EASY PULSE (TIG)” The welding current is pulsed. Main current I (Amp)” and base
current “(%) I” alternate.
PULSE frequency, PULSE (Hz)”, and base current “(%) Iare adjusted automatically
depending on the welding parameters selected.
L When the machine is in Easymode, the LED next to the welding parameters ashes
to show that the value seen in the display corresponds to the parameter chosen
automatically by the machine. If the value is changed, the LED becomes steady.
¾ Bi-level (TIG 4T): once the selected welding current has raised up to its full value (I),
a quick touch at the torch trigger will decrease the welding current (I%); a further quick
touch and the current will increase to its full value (I). To stop welding the trigger should
be kept pressed longer than 0.5sec
F) MMA welding: adjustable parameters
¾ I (Amp)” Welding current adjustment.
¾ ARC FORCE(led slope up) Increases the intensity of the welding current so that the
coated electrode does not stick onto the workpiece to be welded when the arc voltage
becomes too low.
¾ “HOT START” (led I%) Increase the intensity of the welding current to facilitate starting
coated electrodes.
F) Tig welding: adjustable parameters
¾ Φmm” Select the diameter of the tungsten electrode.
Based on the diameter selected, the machine determines the welding current interval
that can be used without damaging the electrode.
In the “AC EASYor EASY PULSEmode, the machine selects the best welding
parameter values according to the diameter of the electrode of the selected welding
current.
There is a chance not to set the electrode diameter (“NO”).
In this case the adjustments of the welding parameters will be only dened based on
the welding current.
¾ PREGAS” Pre-gas time adjustment.
¾ SLOPE-UP” Adjustment of time at which the welding current is brought from the initial
value (arc start) to the main value I (Amp)”. The initial value of the welding current is
pre-set as 50% of the main current value.
¾ I (Amp)”: Main welding current adjustment.
¾ (%) I”: In the “PULSE” and “BILEVEL 4T” modes, it adjusts the base welding current,
expressed as a percentage of the main welding current.
¾ SLOPE-DOWN” Time at which, once the torch button is released, the welding current
is brought from the main value to the nal value (end of welding).
The nal value of the welding current is pre-set as 20% of the main current.
¾ POST-GAS POST-GAS time adjustment. In the “Aut” position the time is set
automatically by the machine between 5 and 20 seconds, according to the main welding
current and to the duration of the welding.
¾ T (SPOT)” In the “SPOT” mode it varies the duration of the welding point.
¾ PULSE (Hz)” In the “TIG PULSEmode, it varies the pulse frequency. The welding
time at the main current is the same as the welding time at the base current.
¾ BALANCE (%)In the TIG ACwelding mode at alternating current, it modies the
ratio between the duration of the positive and the negative half waves.
With “balance” adjusted to 50%, the duration of the positive half wave is the same as
the duration of the negative half wave.
Low “balance” values allow for enhanced arc penetration and little electrode wear and tear.
High “balance” values allow for better cleaning of the workpiece but increased electrode
wear and tear.
¾ FREQUENCY (Hz)” In the “TIG AC” welding mode at alternating current, it varies the
welding current frequency. Low values allow for a better distributed arc. High values
allow for a more concentrated arc.
L) Remote (Foot pedal) control connection pilot lamp
It illuminates when an optional remote (foot pedal) control is connected at the machine.
M) Thermal cutout signal
The warning light switched on means that the thermal protection is running.
If the duty cycle Xshown on the data plate is exceeded, a thermal cutout stops the
machine before any damage is caused. Wait for operation to be resumed and, if possible,
wait a few minutes more.
If the thermal cutout continues to cut in, the welding machine is being pushed beyond its
normal performance levels.
Machine reset
With the machine on, press the Stand By” button for 3 seconds: the factory-set values of
all the parameters will be reset The programs saved are not cancelled.
L Do not connect remote (foot pedal) control.
H) Program saving
The mode settings and the parameters set can be saved to the machine for future use.
There are 9 programs to be saved.
¾ SAVE: saves the selected welding process and the parameters set.
Press the SAVEbutton for 3 seconds and select the program number via the G
encoder. Press the SAVEbutton again for 3 seconds: the message “YES” conrms
that the program has been saved.
The “display” ashes if the program number chosen for saving already has a program.
Choose a different number or conrm the choice if you wish to overwrite the previous
program.
¾ RECALL: recalls a welding program.
Press the RECALL” button for 3 seconds and select the program number via the G
encoder. Press the RECALLbutton again for 3 seconds: the message “YES” conrms
that the welding program is recalled.
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 tted with a grounding conductor.
Do not block the welder air intakes. Do not store the welder in containers or on shelving
that does not guarantee suitable ventilation.
Do not use the welder 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 welder have been treated with protective resins. When used for
the rst time, smoke may be noticed; this is caused by the resin drying out completely.
The smoke should only last for a few minutes.
Maintenance
Switch off the welder and remove the plug from the power socket before carrying out any
maintenance operations.
Extraordinary maintenance to be carried out by expert staff or qualied electrical
mechanics periodically depending on use. (Apply the rule EN 60974-4).
Inspect the inside of the welder and remove any dust deposited on the electrical parts
(using compressed air) and the electronic cards (using a very soft brush and appropriate
cleaning products). • Check that the electrical connections are tight and that the insulation
on the wiring is not damaged.

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