Xnexus NXT200 AC/DC, Инструкция по эксплуатации

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Instruction manual NXT200/250 AC/DC page 7
Four-times:
The welding process begins by pressing the torch
trigger. Releasing the torch trigger during gas pre-
flow activates the slope-up period. If the torch trigger
is released during the slope-up period welding
continues with the adjusted welding current. In order
to stop the welding process the trigger must be
pressed again for more than 0.5s after which the
slope-down period begins. The slope-down period
can be stopped by releasing the trigger. Thereafter
the post-flow starts.
Second current level
This function is active only when in 4-times. During
welding it is possible to select this second current
level by pressing and releasing very quickly the torch
trigger. It is possible to return to the main current
level by repeating the operation on the torch trigger.
If the torch trigger is pressed for more than 0.5 sec.
the slope-down period will start.
Adjustment of welding current
In this section method of adjustment of
welding current can be selected.
Torch adjustment is not possible during
MMA welding.
Internal adjustment
The knob corrects directly the value shown in
the display.
Foot adjustment
With this selection the machine will go auto-
matically in two-times. The foot control will allow to
start the arc and to adjust the current. The maximum
current reachable is the level previously adjusted on
the front panel.
The actual current is shown on the display.
Torch adjustment
The regulation of welding current is made by
means of the torch potentiometer (optional).
TIG welding
The parameters can be adjusted with the knob after
they are shown on the display.
Press the relative key to select the parameter. The
relevant LED will lit.
Pre-flow [s]:
Pre-flow is the period of time for which gas
flows after the torch switch is pressed and before the
HF arc is established, or until the torch is lifted away
from the workpiece in the LIFTIG process. Variable
0-10 sec
Start Amp [A%]:
Immediately after the arc has been
established, the machine regulates the welding
current to the value stated in the Start Amp
parameter. Start Amp is set as a percentage of the
required welding current and is variable between 10-
200% of the welding. Please note that values bigger
than 100% generate a Start Amp bigger than
welding current.
Slope-up [s]:
Once the arc has been established, the
welding process enters a slope-up stage during
which the welding current is increased in linear
fashion from the value stated in the Start Amp para-
meter to the required welding current. The duration
of this slope-up time is variable 0-25 sec in steps of
0.1 sec.
Welding current [A]:
From 7A to 200A or 250A depending on the
machine model.
Second current level
Adjustable from 10 to 200% of welding
current. It is activated in four-times by pressing and
releasing quickly the torch trigger. Please note that
values bigger than 100% generate a second current
bigger than welding current.
Slope-down [s]:
When welding has stopped by activating the
trigger, the machine enters a slope-down stage.
During this stage current is reduced from welding
current to Stop Amp over a period of time called the
slope-down time and variable 0-25 sec in steps of
0.1 sec.
Stop Amp [A%]:
The slope-down stage is completed when
the current level has fallen to the value stated in the
Stop Amp parameter. Stop Amp is stated as a per-
centage of the required welding current and is
variable between 10-90% of the welding current.
START
SLOPE UP
SLOPE DOWN
STOP
START AMP
SLOPE UP
SET WELDING
CURRENT
S
E
C
ON
D CURR
E
N
T
LE
VEL
SLOPE DOWN
STOP AMP