Hypertherm HyIntensity Fiber Laser Rev.3 - Manual (Page 55)

InstallatIon
HyIntensity Fiber Laser Instruction Manual – 807090 Revision 3 2-7
Steps to take
1. Unless noted, use only 6 AWG (16 mm2) welding cable (Hypertherm part no. 047040) for the EMI ground
cables shown on the diagram.
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 drive motor as possible. If there are drive motors at each end of the gantry, run a separate EMI
ground cable from the far drive motor to the gantry bus bar. The gantry bus bar should have a separate, heavy
EMI ground cable (4 AWG [21.2 mm2] part no. 047031) to the table bus bar. The EMI ground cables for the
torch lifter and the RHF console must each run separately to the table ground bus.
3. A ground rod that meets all applicable local and national electrical codes must be installed within 6 m (20 ft)
of the table. This is a PE ground and should be connected to the ground bus on the cutting table with 6 AWG
(16 mm2) green/yellow grounding cable (Hypertherm part number 047121) or equivalent. All PE grounds are
shown on the diagram in green.
4. For the most effective shielding, use the Hypertherm CNC interface cables for I/O signals, serial communication
signals, power supply-to-power supply multi-drop connections, and interconnections between all parts of the
Hypertherm system.
5. All hardware used in the ground system must be brass or copper. The only exception is that the studs welded
to the table for mounting the ground bus can be steel. Under no circumstances should aluminum or steel
hardware be used.
6. AC power, PE, and service grounds must be connected to all equipment according to local and national codes.
7. 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) point on the table. This includes the ignition console, even if it is
bolted to the power supply or to the cutting machine.
8. The laser head holder and the breakaway mechanism – the part mounted to the lifter, not the part mounted on
the torch – must be connected to the stationary part of the lifter with copper braid at least 12.7 mm (1/2 in)
wide. A separate cable must run from the lifter to the bus bar on the gantry. The valve assembly should also
have a separate ground connection to the gantry bus bar.
9. If the gantry runs on rails that are not welded to the table, then the rails need to be connected with a ground
cable from each end of both rails to the table. These need not go to the common (star) point, but could take the
shortest path to the table.
10. All other signals (analog, digital, serial, encoder) should run in twisted pairs inside a shielded cable. Connectors
on these cables should have a metal housing and the shield, not the drain, should be connected to the metal
housing of the connectors at each end of the cable. Never run the shield or the drain through the connector on
any of the pins.