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User Manual
250
i
Ω
MEGA
valve is opened. The right dial should measure and show pressure inside the tank; the dial on the left,
which measures pressure in the hose, should remain at zero (when the regulator dial is fully backed out).
• Slowly turn the regulator dial CLOCKWISE until the dial on the left shows gas pressure between 7-10
liters per second.
Microscope LCD Filter Shutter System
The Microscope LCD Filter Shutter System provides an unobstructed working view before welding and com-
pletely protects your eyes during the welding process. The PA250i’s internal computer verifies the Microscope
LCD Filter Shutter System has been closed before allowing the weld to take place. Should the shutter not close,
the microscope lens is equipped with >UV 16 and >IR 16 for maximum eye protection.
BECOME FAMILIAR WITH THE MICROSCOPE
The Sunstone microscope has been designed to provide maximum visual clarity, eye protection, and ease of
use. One challenge using the microscope is getting used to bringing the workpiece to the welding electrode
while looking through the microscope. This is an easy challenge to overcome. To begin, follow the suggested
practices below while the welder is in Weld Off Mode. While the welder is in Weld Off Mode, it will not be able to
make a weld when the workpiece touches the electrode.
• Rest your hands on the table and position the workpiece close to the welding electrode before looking
into the microscope.
• Make sure your focus is at the tip of the electrode.
• Use slow, controlled movements.
• It is helpful to have your hands resting on the table and
to only use your fingers to move the workpiece up to
the electrode. See Figure 14.1.
• Place the workpiece surface perpendicular to the point
of the electrode.
As discussed in later chapters, the
angle of the electrode tip relative to the workpiece
surface is very important and will take practice.
• Now practice making soft contact with the workpiece
to the electrode.
• Once you feel comfortable, attach the alligator clip to
the workpiece and enable welds (switching the unit to
Weld On Mode) to begin welding.
Be mindful of your
energy setting: Too much power may damage the
workpiece.
Figure 14.1. Rest your hands on the table and position the
workpiece close to, but not touching the electrode., then
look through the microscope.