APPENDIX F SYSTEM GROUNDING
HT4001 Instruction Manual
f-1
SYSTEM GROUNDING REQUIREMENTS
The plasma system must be grounded for safety reasons and to suppress EMI:
•
Safety The entire system—power supply, accessory enclosures, and worktable—must
be grounded to protect it and the operator from a ground fault. The protective earth (PE)
ground connections must be installed by a licensed electrician and conform to national and
local codes.
•
EMI Suppression If allowed by national and local codes, the ground system can also be
used to suppress EMI (electromagnetic interference). Below is a guide to configure the
plasma system for minimal EMI. See Electromagnetic Compatibility in this manual for
additional information.
SUGGESTED GROUND CABLE ROUTING
Power Supply
Connect the power supply to the PE ground terminal, using a properly sized color-coded
conductor. This PE ground is connected to the service ground through the line disconnect
switch. See the Installation section for further information on the power cord and the line
disconnect switch.
Equipment Grounding
All accessory modules that receive power from the plasma power supply must also use the
power supply’s ground—either by connection to the PE terminal of the power supply, or by
direct connection to the equipment ground conductor. Each module should have only one
connection to ground to avoid ground loops. If any enclosure is grounded to the work table,
the work table must be grounded to the power supply.
Effective grounding for EMI reduction is highly dependent upon the installation configuration.
Two acceptable configurations are shown in Figures f-1 and f-2.
The RHF console should be installed near the work table, and grounded directly to it. Other
modules should be installed near the power supply, and grounded directly to it
(Figure f-1).
All modules may also be installed near the work table, and grounded directly to it (Figure f-2).
Do not ground the RHF console directly to the power supply.
The customer must furnish all conductors for equipment grounding. Grounding conductors
may be purchased through Hypertherm in any length specified by the customer (Part No.
047058). The conductor may also be purchased locally, using a minimum 8 AWG UL Type
MTW cable (USA specification) or the appropriate cable specified by national and local
codes.
Consult the appropriate manufacturer’s instructions to ground equipment that does not
receive power from the power supply.
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