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3-4 Field Control™ Genius® Bus Interface Unit User’s Manual
–
October 1999 GFK-0825F
3
System Grounding
All components of a control system and the devices it controls must be properly
grounded.
Ground conductors should be connected in a star fashion, with all branches routed to a
central earth ground point as shown below. This ensures that no ground conductor carries current
from any other branch.
Programming
Device
Each Terminal
Block
Motor Drives and
Other Electrical
Control
Equipment
Machinery
Earth
Ground
Central
Ground Point
NOTE
Signal and power
connections not shown
Each Field Control Terminal Block has a chassis ground terminal for safety and noise protection.
This terminal should be connected to the conductive mounting panel with a 4-inch maximum
length of AWG #14 (avg 2.1mm
2
) wire. Use hardware such as star washers to ensure ground
integrity.
The control panel and enclosure should also be bonded to the plant system ground per code.
Inadequate grounding may compromise system integrity in the presence of power switching
transients and surges.