Xnexus NXT200 AC/DC, Instruction Manual

Page: 6 / 18

Instruction manual NXT200/250 AC/DC page 6
INITIAL INSTRUCTIONS
All "parameters" are set by the use of only one
control knob. These parameters include current,
pulse time, slope-up time, etc.
This control knob is positioned in the middle of the
control panel. The digital display shows the value of
the parameter being set. The unit of measurement of
the parameter is shown at the left hand side of the
digital display.
Selection of a parameter is by means of the relative
keypad in the relevant section. The parameter
selected is indicated by a bright indication light. Then
turn the control knob to set the new value.
Storage of parameters
The machine memorises all settings also when the
mains voltage is switched off, thus ensuring that the
same machine settings are available when the
machine is switched on again.
Independent adjustments in the two welding
processes (MMA and TIG) are stored as well, so that
switching from one welding process to another does
not require a new setting of parameters.
Setting of the machine
The following describes in detail the operation of the
machine.
Welding voltage
The welding voltage indicator is illuminated for
reasons of safety and in order to show if there is
voltage at the output connectors.
Units of measurement of the parameter
Units of measurement of the selected
parameter.
Overheating
The overheating indicator is illuminated if
welding is interrupted due to overheating of the
machine.
Input voltage variations
The mains error indicator is illuminated if the
mains voltage is more than 15% lower or higher than
the rated voltage.
Welding process
In this section it is possible to choose
the welding process:
•
MMA electrode
•
TIG AC/DC
•
TIG DC
It is not possible to change welding
process during welding.
Torch switch functions
It is possible to choose between to
different methods of ignition for TIG
welding: High-Frequency (HF) and
LIFTIG ignition. Moreover, it is possible
to adjust the following parameters:
slope-up, slope-down and second
current level. It is not possible to
change setting during welding.
HF-ignition:
In HF-TIG ignition the TIG arc is ignited without
contact. A high-frequency (HF) impulse initiates the
arc when the torch trigger is activated.
The HF will not arise and the machine will stop if the
electrode is in contact with the workpiece. Detach
the electrode and start again.
LIFTIG-ignition:
In LIFTIG ignition the TIG arc is ignited after making
contact between the workpiece and the tungsten
electrode, after which the trigger is activated and the
arc is established by lifting the electrode from the
workpiece.
Two-times:
The welding process begins by pressing the torch
trigger. Welding continues until the trigger is
released again which effects the slope-down period.