Tweco PakMaster 75XL Plus - Manual (Page 23)

Manual 0-2746 17 SECTION 3: INSTALLATION PROCEDURES
4. Feed the end of the torch leads through the hole in the
front panel in the following order:
• Control Cable
• Gas lead
• Pilot Lead
5. Place the Strain Relief Nut over the torch leads and
position it in the hole in the front panel.
6. Hold the Strain Relief Nut in position and tighten the
Strain Relief on the outside of the unit.
7. Connect the torch gas/power lead fitting onto the Gas/
Power Lead Connection.
Control Cable
Pilot Lead
Torch Lead
Assembly
Gas/Power
Lead
Control Cable
Connector
Pilot Lead Stud
Gas/Power Lead
Connection
A-00929
Figure 3-12 Torch Leads Connections
7. Connect the Torch Control Cable to the Torch Control
Connection.
8. Remove the top nut and washer from the Pilot Stud.
9. Place the lug on the Pilot Control Wire onto the stud
and secure with the nut and washer removed in Step
8.
10. Close the access panel and turn the latching screw .
3.10 Work Cable And Ground
Connections
A. Electromagnetic Interference (EMI)
Pilot arc initiation generates a certain amount of electro-
magnetic interference (EMI), commonly called RF noise.
This RF may interfere with other electronic equipment
such as CNC controllers, etc. To minimize RF interfer-
ence, follow these grounding procedures when install-
ing mechanized systems:
B. Creating an Earth Ground
1. Install a ground wire (not included) between the sys-
tem and a solid earth ground (also called star ground).
To create a solid earth ground, drive a 1/2 in (12 mm)
diameter copper rod at least 6 - 8 ft (1.8 - 2.4 m) into
the earth so that the rod contacts moist soil over most
of its length. The required depth will vary depend-
ing on location (see NOTE). Locate the rod as close as
possible to the power supply. The work table should
be connected to the same earth ground as the power
supply.
NOTE
A properly installed ground rod will have a resis-
tance of one ohm or less.
2. Connect the control device (CNC) to a separate earth
ground similar to the ground rod described above.
The ground cable should be at least 12 gauge (4 mm
2 )
wire.
3. To minimize RF interference, position torch leads as
far as possible (at least 1 ft or 0.3 m) from any CNC
components, drive motors, control cables, or primary
power lines.
4. Keep torch leads clean. Dirt and metal particles bleed
off energy, which causes difficult starting and in-
creased chance of RF interference.
5. Make sure work cable and ground cables are properly
connected. The work cable must have a solid connec-
tion to the workpiece or cutting table. The connec-
tion must be free from dirt, grease, oil and paint
A-02459
Make a solid work cable
connection to the work-
piece or cutting table
Work Cable
And Clamp
Figure 3-13 Power Supply Work Cable Connection