Tweco 3000 Merlin - Manual (Page 25)

Manual 0-2532 3-7 INSTALLATION
CAUTION
No other connections should be made at the
ground rod being tested. This test assumes
that the 115 or 230-VAC source neutral is con-
nected to the utility earth ground.
2. Increasing the ground rod length beyond 20 - 30 ft
(6.1 – 9.1 m) does not generally increase the effec-
tiveness of the ground rod. A larger diameter rod
which has more surface area may help. Sometimes
keeping the soil around the ground rod moist by con-
tinuously running a small amount of water into it will
work. Adding salt to the soil by soaking it in salt water
may also reduce its resistance. When these meth-
ods are used, periodic checking of the ground resis-
tance is required to make sure the ground is still good.
D. Routing Of Torch Leads
1. To minimize RF interference, position torch leads as
far as possible from any CNC components, drive mo-
tors, control cables, or primary power lines. If cables
have to pass over torch leads, do so at an angle. Do
not run the plasma control or other control cables in
parallel with the torch leads in power tracts.
2. Keep torch leads clean. Dirt and metal particles bleed
off energy, which causes difficult starting and in-
creased chance of RF interference.
A-00141
Make a solid work cable
connection to the work-
piece or cutting table
Figure 3-8 Work Cable Connection
3.10 Plasma And Secondary Gas
Connections
The Power Supply provides the liquid cooling to support
operation of the Liquid Cooled Maximizer 300 Torch.
NOTE
Refer to the Liquid Cooled Maximizer 300
Torch Instruction Manual (Cat. No. 0-2549) for
information on plasma and secondary gas se-
lection and requirements.
The following are available gases that can be used with
the Liquid Cooled Maximizer 300 Torch:
Plasma Gases: Compressed Air, Oxygen (O2), Ni-
trogen (N2), or Argon/Hydrogen (Ar/H2)
Secondary Gases: Compressed Air, Nitrogen (N2),
Carbon Dioxide (CO2), or Tap Water (refer to follow-
ing note)
Plasma and secondary requirements vary depending on
the application. The plasma and secondary gases are
connected to the rear panel connections of the power
supply. Depending on the options installed and the source
of the gases will determine the installation of filters and
regulators.
This sub-section includes information for connecting the
gas supplies to the Power Supply. The information is
grouped in paragraphs for different types of gases and
options per the following:
A. Using Shop Air
B. Using High-Pressure Gas Cylinders
C. Using Water Secondary
D. Plasma and Secondary Gases With Gas Con-
trol Option
Refer to the appropriate paragraph(s) for the desired ap-
plication to be used.
A. Using Shop Air
An air filter should be installed on the Power Supply when
using air from a compressor to insure that moisture and
debris from the supply hoses does not enter the torch.
For highly automated applications, a refrigerated drier
plus a particulate filter may be used to chill the air to
remove all moisture.
CAUTION
Excessive oil or moisture in compressed air
will reduce torch parts life and cutting perfor-
mance and may cause torch failure.