■
A ground rod (a PE ground) that meets all applicable national and local electric codes must be
installed within 6 m (20 ft) of the cutting table. For XPR cutting systems, the PE ground must be
connected to the cutting table ground bus bar using a minimum 21.2 mm
2
(4 AWG) grounding cable
(047031). Consult an electrician in your location to make sure that your grounding meets all national
and local electric codes.
■
For the most effective shielding, use the Hypertherm CNC interface cables for Input/Output (I/O)
signals, serial communication signals, between plasma cutting systems in multi-drop connections, and
for interconnections between all components of the Hypertherm system.
■
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.
■
AC power, PE, and service grounds must be connected to all equipment according to national and
local codes.
■
For a cutting system with a RHF console or combined ignition/gas connect console, the positive,
negative, and pilot arc cables should be bundled together for as long a distance as possible. The torch
lead, work cable, and the pilot arc (nozzle) cables 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.
■
For a cutting 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.
■
Each Hypertherm component, and 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 cutting system or to the cutting table.
■
For XPR cutting systems, the coupler on the pilot arc and coolant hose assembly must be connected
firmly to the gas connect console and TorchConnect console collars. Make sure to tighten the clamp.
The collar on the torch lead must be connected firmly to the torch sleeve. Make sure to tighten the
clamp. Connect a ground cable (10 AWG) to the flat terminal on the torch mounting sleeve.
■
The torch holder and the torch breakaway mechanism – the part mounted to the lifter, not the part
mounted to the torch – must be connected to the stationary part of the lifter with copper braid at least
12.7 mm (0.5 inches) wide. A separate cable must run from the lifter to the gantry ground bus bar. The
valve assembly should also have a separate ground connection to the gantry ground bus bar.
■
If the gantry runs on rails that are not welded to the table, then each rail must be connected with a
ground cable from the end of the rail to the table. The rail ground cables connect directly to the table
and do not need to connect to the table ground bus bar.
Qualifications and Requirements
2
74
811530 Instruction Manual XPR460
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