Tweco PAK 10 - Manual (Page 22)

Operation 10 Manual No. 0-0515
3. Turn the ON/OFF switch ON (9, Figure 3-A). The
amber “READY” light will come on. (If the gas sup-
ply is on, the gases will flow for two seconds).
4. Turn the RUN/SET switch to the SET position.
Open the plasma gas supply valve at the source.
Adjust the pressure regulator on the gas supply until
the plasma gas pressure reads 30 psi (2.0 bar).
5. Purge for approximately 3 minutes by letting the
plasma gas run. This will remove any condensed
moisture that may have accumulated in the torch
or leads while the system was shut down.
6. Open the secondary gas supply valve at the source.
Adjust the pressure regulator at the gas supply un-
til pressure reads 50 psi (3.4 bar).
7. Return the RUN/SET switch to the RUN position.
8. Set the current adjust knob (l, Figure 3-A) to the de-
sired amperage level.
The system is now ready for operation. The torch is
controlled by the switch mounted on the torch handle
(or the remote control switch for a machine mounted
torch).
3.3 OPERATION
HAND TORCH OPERATION
WARNING
Be sure the operator is equipped with proper
gloves, clothing, eye and ear protection and that
all precautions at the front of this manual have
been followed.
l. Hold the torch comfortably, as shown in Figure 3-B.
One hand should be close to the head assembly and
the other hand positioned so that the thumb can con-
veniently operate the control switch. Position the
torch over the workpiece, resting the front of the
cup on the edge of the workpiece at the point where
the cut is to start. This will positively locate the line
of the cut.
A-01917
Figure 3-B Positioning the Hand Torch for a Cut
2. Lower the welding helmet and lift the torch about
1/8" (3 mm) from the workpiece. Then press and
hold the control switch on the torch. After a two
second gas purge, the pilot arc will come on and
remain on until the main cutting arc is established,
at which point the pilot arc circuit switches off au-
tomatically.
A-03310
Figure 3-C Hand Cutting Over a Line on the
Workpiece
3. The cutting arc will remain on as long as the control
switch is held down unless the torch is withdrawn
from the work or the torch motion is too slow. If the
cutting arc is interrupted, the pilot arc will come on
again. It will remain on until the cutting arc is again
established or the control switch is released.
4. Cut with the torch about 1/8" to 1/4" (3 to 6 mm)
from the workpiece, as shown in Figure 3-C. Keep
the torch perpendicular to the work.