laguna Plasma Level 2 CNC, Owner'S Manual

Page: 55 / 160

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19.) Grounding Connections-
Pilot arc starting generates a certain amount of Electromagnetic Interference (Called EMI) . This is
commonly called RF noise. This RF noise may interfere with other electronic equipment such as
the CNC controller and other equipment in the vicinity. To minimize the RF interference the
following grounding procedures should be followed when installation of the machine is
undertaken.
Drive 5/8" diameter X 10 feet long copper clad steel earth rod as close to the table as possible. It
may be necessary to weld a second rod to reach the moisture layer to achieve a proper ground.
Follow the attached instructions for proper earth ground rod testing. If multiple ground rods are
required to achieve proper grounding keep a minimum distance of 1.1 times the driven length
between driven rods.
Create a main star ground on one of the table legs. The main star ground will be the only point
where all grounding wires will terminate before the earth ground rod.
The point should have good metal to metal contact and provide enough ground lead attachment
points to
eliminate the need to stack lead terminals, See Figure 2 below :