INSTALLATION
3-6 HPR130 Manual Gas Instruction Manual
5
System grounding requirements
The plasma system must be grounded for safety reasons and to suppress electromagnetic interference (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 or local codes.
•
EMI Suppression
If allowed by national or local codes, the ground system can also be used to suppress
EMI. 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 on 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 and stray
currents. 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 1 and 2.
The ignition console should be installed near the work table, and grounded directly to it when mounted remotely.
A locally mounted Ignition console (mounted on the power supply) is grounded directly to the power supply.
Other modules should be installed near the power supply, and grounded directly to it (Figure 1).
All modules may also be installed near the work table, and grounded directly to it (Figure 2). Do not ground a
remotely located ignition 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.
To Next Page
Loading...
Need help?
General
