INSTALLATION
HPR130 Manual Gas Instruction Manual 3-7
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Work table grounding
If a supplementary ground rod is installed near the worktable to reduce EMI, it must be connected directly to the
PE ground of the building structure, connected to the service ground; or to earth, providing the resistance between
the ground rod and the service ground meets national or local codes. Place the supplementary ground rod within
6 m (20 ft) of the worktable according to national or local codes.
If any module is grounded to the work table, the work table must be grounded to the power supply, or the
configuration must be changed to comply with applicable national and local electrical codes.
A ferrite choke can be placed in the conductor between the work table ground rod and the PE ground, with a
number of turns through the choke to isolate the safety ground (at 60 Hz) from any electromagnetic interference
(frequencies above 150 Khz). The more turns the better. A suitable ferrite choke can be made by wrapping 10 turns
or more of the ground lead through Magnetics part number 77109-A7, Fair-Rite part number 59-77011101, or other
equivalent ferrite choke. Locate the choke as close as possible to the plasma power supply.
Figure 1 Recommended Ground Connection Configuration
Note: Configuration may vary for each installation and may require a different ground scheme.
Plasma Power Supply
(PE)
(PE)
(PE)
(PE)
Power Cord
Ground
Ferrite Choke
Supplementary
Grounding Rod
Gas Console
Other Equipment
receiving power from the
plasma power supply
Ignition Console
Work Table
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