Compressed Air - Dukane VWA-4300 User Manual

Compressed Air

The welder requires a supply of clean, dry, compressed
air at 75 to 90 psi. The connection is made using
inch O.D. tubing at the pneumatic lockout device shown
in Figure 2-5 and 7-2. The filter and regulator are inside
the hydraulic cabinet and are shown in Figure 3-9.
The compressed air from the pneumatic lockout enters
from the left. The filtered air exits to the right. The em-
bossed arrow on the housing, below the pressure gauge
indicates this airflow direction. The filtered air is fed up
to the air distribution manifold above the filter (see Fig-
ure 2-6), which contains the pneumatic control valves.
Each pneumatic device has its own remotely–controlled
valve unit and flow controls. Adjusting the valves and
flow controls is covered in Section 9 – Optimizing
Performance.
The pressure gauge displays the pressure of the filtered air
out. It is calibrated in psi. To adjust the pressure, lift the
adjustment knob until the orange band is visible at the base
of the knob. Turning the knob clockwise
viewed from above) will increase the pressure.
Push the knob back down to its locked position to prevent
any changes in the setting.
The front cover of the gauge can be removed to adjust
the set points. Twist the cover counterclockwise
about / th of a turn and gently pull to remove the
1
8
cover. Position the two green pointers at the desired
lower and upper limits. They are normally set at the fac-
tory to about 75 psi and 85 psi (5.1 bar and 5.7 bar re-
spectively). These pointers are only visual indicators,
and do not override the regulator setting.
The canister below the pressure gauge contains the air
filter and moisture trap. The air filter is self-draining
of any accumulated moisture by means of a drain hose
which exits the bottom of the machine. Keep this in mind
if moisture draining to the floor could cause a problem.
The filter has an internal float, and will empty under pres-
sure when approximately 25 cm
of water has accumulated.
Refer to Section 11 - Maintenance, for complete infor-
mation on the instructions for replacing the filter element.
Dukane Manual Part No. 403-592-00
/
1
2
(when
= 25 ml (0.85 ounce)
3
Compressed
Air Regulator
(Lift to Adjust)
Compressed
Air Inlet
Compressed Air Filter and Regulator
Figure 3- 9
Never attempt to remove
the filter housing while the
compressed air is on. Turn
off the compressed air us-
ing the pneumatic lockout
device and make sure the
pressure gauge reads zero.
Section 3 - Installation
Low Pressure
Set Point
High Pressure
Set Point
Removable
Cover for
Set Point Access
Filtered
Compressed
Air
Out
Regulator
Pressure
Gauge
Air Filter
Trapped
Moisture
Drain
Line
WARNING
Page 21