44 EDGE Pro Ti CNC Instruction Manual 807660
Installation
Mounting the THC
Grounding practices
1. Unless noted, use cables with a minimum gauge of 13.3 mm
2
(6 AWG) (047040) for the EMI ground
cables shown in the “Example grounding diagram” on page 47.
2. The cutting table is used for the common, or star, EMI ground point and should have threaded studs
welded to the table with a copper bus bar mounted on them. A separate bus bar should be mounted on
the gantry as close to each motor as possible. If there are motors at each end of the gantry, run a separate
EMI ground cable from the far motor to the gantry bus bar. The gantry bus bar should have a separate,
heavy EMI ground cable 21.2 mm
2
(4 AWG; 047031) to the table bus bar. The EMI ground cables for the
torch lifter and the RHF or combined ignition/gas connect console must each run separately to the table
ground bus.
3. Inadequate grounding not only exposes operators to dangerous voltages, but inadequate grounding also
increases the risk of equipment failure and unnecessary downtime. Ideally a ground should be zero ohms
resistance, but field experience indicates under 1 ohm resistance is satisfactory for most applications.
Hypertherm recommends that you consult your local and national electrical codes to make sure that the
grounding and shielding practices that you use satisfy the requirements for your location.
4. A ground rod (a PE ground) that meets all applicable local and national electric codes must be installed
within 6 m (20 ft) of the cutting table. The PE ground must be connected to the cutting table ground bus
bar using a minimum 13.3 mm
2
(6 AWG) green and yellow grounding cable (047121).
5. For the most effective shielding, use the Hypertherm CNC interface cables for I/O signals, serial
communication signals, between plasma systems in multi-drop connections, and for interconnections
between all parts of the Hypertherm system.
6. All hardware used in the ground system must be brass or copper. While you can use steel studs welded to
the cutting table for mounting the ground bus, no other aluminum or steel hardware can be used in the
ground system.
7. AC power, PE, and service grounds must be connected to all equipment according to local and national
codes.
8. For a system with a remote high frequency (RHF) console or combined ignition/gas connect console, the
positive, negative, and pilot arc leads should be bundled together for as long a distance as possible. The
torch lead, work lead, and the pilot arc (nozzle) leads may be run parallel to other wires or cables only if
they are separated by at least 150 mm (6 inches). If possible, run power and signal cables in separate
cable tracks.
9. For a system with a RHF console or combined ignition/gas connect console, Hypertherm recommends
that you mount this console as close as possible to the torch. This console also must have a separate
ground cable that connects directly to the cutting table ground bus bar.
10. Each Hypertherm component, as well as any other CNC or motor drive cabinet or enclosure, must have a
separate ground cable to the common (star) ground on the table. This includes the ignition/gas connect
console, whether it is bolted to the plasma system or to the cutting table.
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