For more information about CNC commands, refer to the CNC
Communication Protocol for the XPR Cutting System (809810).
Recommended grounding and shielding
It is important to use grounding and shielding best practices when you set up a plasma cutting system.
This can minimize problems related to EMI, or electrical noise.
This documentation describes practices for grounding and shielding a plasma cutting system to minimize
its susceptibility to EMI (also known as noise). It also describes the service ground, Protective Earth (PE)
ground, and Direct Current (DC) power ground. The diagram at the end of this section shows these types
of grounds in a plasma cutting system.
The grounding practices in this documentation have been used on many
installations with excellent results, and Hypertherm recommends 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. However, due to
the variation in equipment and installations, these grounding practices
may not succeed in every case to eliminate EMI problems. Hypertherm
recommends that you consult your national and local electrical codes
to make sure that the grounding and shielding practices that you use
comply with the requirements for your location.
Types of grounding
When you set up an XPR cutting system, make sure that you comply with the four types of grounding:
service ground, PE ground, DC power ground, and EMI grounding and shielding.
Service ground
Service ground (also known as safety ground) 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 cutting
table. It includes the service ground coming into the plasma cutting system and other systems,
such as the CNC and the motor drives, and the supplemental ground rod connected to the cutting
table. In the plasma circuits, the ground is carried from the plasma power supply chassis to the
chassis of each separate console through the interconnecting cables.
Qualifications and Requirements
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811530 Instruction Manual XPR460
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