Tweco 150XL CE PAK Master - Manuel (Page 24)

INSTALLATION 3-6 Manual 0-2826
b. Place the ring lugs from the inner (RED) Torch Leads
Shield Wires over the shield stud on the Torch Bulk-
head Panel.
c. Secure the wires with the nut and star washer.
d. Place the ring lugs from the outer (GREEN /
YELLOW) Torch Leads Shield Wires over the
shield stud on the power supply chassis.
e. Use the nut and star washer previously removed
from the torch leads assembly to secure the wires
to the shield stud on the power supply chassis.
Secondary
Gas
Plasma (+)
Gas
Control Cable
Connector
Coolant
Supply (-)
CNC Control
Cable
RED Shield Wires
With Ring Lugs
Torch Leads
Shield Stud
(for INNER Shields)
GREEN / YELLOW Shield
Wires with Ring Lugs
Torch Leads
Shield Stud
(for OUTER Shields)
Coolant
Return
Art # A-03997
Power
Supply
Chassis
Torch
Bulkhead
Panel
Figure 3-6 Shielded Machine Torch Connections
7. Connect torch coolant and gas leads to connectors on
the Torch Bulkhead Panel.
8. Close the Access Panel and turn the two latching
screws.
9. Check the torch for proper parts assembly.
10. Connect the other end of the CNC Control Cable to
the desired equipment.
3.08 Ground Connections For
Mechanized Applications
A. Electromagnetic Interference (EMI)
Pilot arc initiation generates a certain amount of electro-
magnetic interference (EMI), commonly called RF noise.
This RF noise may interfere with other electronic equip-
ment such as CNC controllers, remote controls, height con-
trollers, etc. To minimize RF interference, follow these
grounding procedures when installing mechanized sys-
tems:
B. Grounding
1. The preferred grounding arrangement is a single point
or “Star” ground. The single point, usually on the
cutting table, is connected with 1/0 AWG (European
50 mm
2 ) or larger wire to a good earth ground (refer to
paragraph ‘C’, Creating An Earth Ground). The
ground rod must be placed as close as possible to the
cutting table, ideally less than 10 ft (3.0 m), but no more
than 20 ft (6.1 m).
NOTE
All ground wires should be as short as possible.
Long wires will have increased resistance to RF fre-
quencies. Smaller diameter wire has increased re-
sistance to RF frequencies, so using a larger diam-
eter wire is better.
2. Grounding for components mounted on the cutting
table (CNC controllers, height controllers, plasma re-
mote controls, etc.) should follow the manufacturer’s
recommendations for wire size, type, and connection
point locations.
For Thermal Dynamics components it is recommended
to use a minimum of 10 AWG (European 6 mm
2 ) wire
or flat copper braid with cross section equal to or greater
than 10 AWG connected to the cutting table frame. The
connection point must be clean bare metal; rust and
paint make poor connections. For all components,
wires larger than the recommended minimum can be
used and may improve noise protection.
3. The cutting machine frame is then connected to the “Star”
point using 1/0 AWG (European 50 mm 2 ) or larger wire.
4. The plasma power supply work cable (see NOTE) is con-
nected to the cutting table at the single point “Star” ground.
NOTE
Do Not connect the work cable directly to the
ground rod.