Hypertherm PHC Sensor - Manual (Page 28)

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Sensor™ PHC Operation and Setup Guide
Grounding Requirements
WARNING!
To ensure personal safety and reduce electromagnetic interference (EMI), the PHC system must be
properly grounded.
NOTE: For reliable operation, the lifter ground terminals must be connected to the ground on the
cutting table ground to provide measurement feedback for tip touch sensing. The plasma interface
ground terminals must be connected to the plasma power supply positive ground to provide
measurement feedback for arc voltage. Both types of feedback are essential for optimal cutting
performance.
Power cord grounding
The PHC control module must be properly grounded through the power cord according to national or local
electrical codes.
Protective earth ground
Install protective earth (PE) grounding cables to the three PHC components (control unit, lifter, and plasma
interface,) as shown in Figure 13. Grounding must comply with national or local electrical requirements.
Note: The PE (Ground) cables must be supplied by the customer.
Figure 13: System Grounding
Connect control
unit to star ground
on work table.
Connect plasma
interface to star
ground on work
table.
Connect lifter
assembly to star
ground on work
table.