Tweco Merlin 6000GST Master PS - Manual (Page 26)

INSTALLATION PROCEDURES 3-6 Manual 0-2652
To test for a proper earth ground, refer to the following
diagram. Ideally, the reading on the multimeter should be
as follows:
• For 115VAC: 3.0 VAC
• For 230VAC: 1.5 VAC
A-02971
+
_
Meter set to
VAC setting
Machine
Earth Ground
Neutral
Line (Hot)
100W
Light Bulb
115 or 230VAC
WARNING
Use extreme caution. This
test uses live voltage.
115VAC: 3.0 VAC
230VAC: 1.5 VAC
V ~
V
~
VR COM A
Ground Testing
2. Increasing the ground rod length beyond 20 - 30 ft
(6.1 – 9.1 m) does not generally increase the effective-
ness 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 resistance is re-
quired 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 increased 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
), Nitrogen
(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 sup-
ply. 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 contaminants 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.