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J12
Black Wire From
E8 to E23
Figure 3-11 Control and Pilot Cable Connections
5. Re-install the Power Supply Cover on the Power Sup-
ply.
3.09 Work Cable And Ground
Connections
A. Electromagnetic Interference (EMI)
High frequency pilot arc initiation generates a certain
amount of electromagnetic interference (EMI), commonly
called RF noise. This RF may interfere with other elec-
tronic equipment such as CNC controllers, etc. To mini-
mize RF interference, follow these grounding procedures
when installing 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 approximately 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
depending on location. 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.
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
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.
INSTALLATION PROCEDURES
Pilot/Output
PC Board
Control
Cable
E27
A-01685
Pilot Cable
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 prop-
erly connected.
A-01686
Make a solid work cable
connection to the work-
piece or cutting table
Figure 3-12 Power Supply Work Cable Connection
2
)
16
Work Cable
And Clamp
Manual 0-2700
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