Tweco 75XL Plus PAK Master - Manuel (Page 26)

INSTALLATION 3-8 Manual 0-2807
5. Remove the top nut and washer from the Pilot
Stud.
6. Connect the pilot lead terminal to the stud and
secure with the nut and washer removed previ-
ously.
7. Connect the ATC Adapter connectors to the power
supply adapter.
WARNING
The Shielded ATC Adapter includes two connec-
tors that are not used and must be taped out of the
way to prevent contacting the Negative / Plasma
or Pilot Leads.
8. Tighten the Strain Relief onto the ATC Adapter
leads.
9. Connect the torch leads male connector to the ATC
female receptacle. The connectors should push
together with a very small amount of pressure.
Secure the connection by turning the locking nut
clockwise until it stops. DO NOT use the locking
nut to pull the connection together. Do not use
tools to secure the connections.
A-03627
1
2
ATC Male
Connector
ATC Adapter
Female Receptacle
Torch Leads
To
Power Supply
Torch Connection - Torch Leads with ATC Male
Connector, Power Supply with ATC Adapter
10. Check the torch for proper consumable parts.
CAUTION
The torch parts must correspond with the type of
operation. Refer to the torch manual for details.
3.10 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
controllers, 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
frequencies. Smaller diameter wire has increased
resistance to RF frequencies, so using a larger di-
ameter 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 recom-
mended 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 pro-
tection.
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
connected to the cutting table at the single point “Star”
ground.
NOTE
Do Not connect the work cable directly to the
ground rod.