Tweco 6000GST Merlin Plasma Cutting CE Slave Power Supply - Manual (Page 24)

INSTALLATION PROCEDURES 3-6 Manual 0-2653
2. Increasing the ground rod length beyond 20 - 30 ft (6.1 – 9.1
m) does not generally increase the effectiveness 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 continuously 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
methods 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.
3.09 Gas Connections
The Master Power Supply provides the liquid cooling and
gases to support operation of the Liquid Cooled Maxi-
mizer 300 Torch.
NOTE
Refer to the Liquid Cooled Maximizer 300 Torch
Instruction Manual (Cat. No. 0-2642 for informa-
tion on plasma and secondary gas selection and
requirements.
The following are available gases that can be used with
the Liquid Cooled Maximizer 300 Torch:
Plasma Gases: Compressed Air, Oxygen (O
2
), Ni-
trogen (N2), or Argon/Hydrogen (Ar/H
2
)
Secondary Gases: Compressed Air, Nitrogen (N2),
Carbon Dioxide (CO
2
), or Tap Water
Pre-Flow Gas: Nitrogen (N2)
Gas requirements vary depending on the application. The
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. The type of gases to be used will
be selected at the front panel of the Gas Control Module
(GCM6000).
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 as follows:
A. Using Shop Air
B. Using High-Pressure Gas Cylinders
C. Using Water Secondary
Refer to the appropriate paragraph(s) for the desired applica-
tion to be used.
A. Using Shop Air
An inline pneumatic dryer/evaporator type air filter, capable of
filtering particulates to at least 5 microns with a dew point of
35°F (1.7°C), is required when using air from a compressor. This
type filter will insure that moisture, oil, dirt, chips, rust particles,
and other contminants from the supply hose do 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 performance and
may cause torch failure.
All Merlin 6000GST Systems are supplied with a Two
Stage Air Line Filter attached to the rear of the Master
Power Supply. The following procedure is the recom-
mended shop air connection method:
NOTE
The Two Stage Air Line Filter Assembly is to be
used when using shop air as the Plasma Gas.
1. Place thread sealer on the threads of the Street Elbow
on a Y-Hose Assembly (see NOTES).
NOTES
Do Not use teflon tape as a thread sealer as small
particles of the tape may break off and cause the
small gas passage to be blocked in the torch.
The Y-Hose Assembly is customer supplied and is
shown to illustrate one method of connecting the
customer's air supply.
2. Connect the air supply hose from a Y-Hose Assembly
to the street elbow on the Air Line Filter input port
(IN). The Y-Hose Assembly should have already been
installed, if shop air was being used as the plasma
and secondary gases.