Hypertherm HyIntensity Fiber Laser Rev.3 - Manual (Page 54)

InstallatIon
2-6 HyIntensity Fiber Laser Instruction Manual – 807090 Revision 3
Recommended grounding and shielding practices
DANGER
ELECtRIC SHOCK CAN KILL
Disconnect electrical power before performing any maintenance. All work
requiring the removal of the power supply cover must be performed by a
qualified technician.
See Section 1 of the laser/plasma system instruction manual for more safety
precautions.
Introduction
This document describes the grounding and shielding necessary to protect a laser/plasma cutting system installation
against radio frequency interference (RFI) and electromagnetic interference (EMI) noise. It addresses the three
grounding systems described below. There is a diagram on page 3-10 for reference.
Note: These procedures and practices are not known to succeed in every case to eliminate RFI/EMI noise
issues. The practices listed here have been used on many installations with excellent results, and we
recommend that these practices be a routine part of the installation process. The actual methods used to
implement these practices may vary from system to system, but should remain as consistent as possible
across the product line.
types of grounding
A. The safety (PE) or service ground. This is the grounding system that applies to the incoming line voltage. It
prevents a shock hazard to any personnel from any of the equipment, or the work table. It includes the service
ground coming into the laser/plasma power supply and other systems such as the CNC controller and the
motor drivers, as well as the supplemental ground rod connected to the work table. In the laser/plasma circuits,
the ground is carried from the laser/plasma power supply chassis to the chassis of each separate console
through the interconnecting cables.
B. RFI and EMI grounding and shielding. This is the grounding system that limits the amount of electrical “noise”
emitted by the laser/plasma and motor drive systems. It also limits the amount of noise that is received by the
CNC and other control and measurement circuits. This grounding/shielding process is the main target of this
document.