Assembly and Installation
Chapter 3
310
Each vertical group of components is connected together (Figure 3.7) and these
groups are connected to a ground bus mounted on the back panel of the
enclosure (Figure 3.8 and Figure 3.9). The ground bus is connected to the
grounding electrode system through a grounding electrode conductor.
Avoid connecting more than two lugs to a single bolt since the compression of
the metal lug can loosen the connection.
Enclosure Grounding
The enclosure that contains the Allen-Bradley Programmable Controller
components must be connected to earth ground (Figure 3.10). Grounding paths
to earth ground must be permanent and continuous, and must be able to conduct
electromagnetic noise currents and possible ground fault currents safely to earth
ground with minimum impedance.
Figure 3.7
Typical MiniPLC2/15 Controller Grounding Configuration
To Earth Ground
(Grounding Electrode
Systems)
Lug
Enclosure
Equipment Grounding
Conductor
Note: No connection is made to the Equipment Ground Terminal on the Power Supply when
this Ground COnfiguration is used. This could lead to Ground Loops. See incoming AC Wiring
GUidelines, Section titled INCOMING AC WIRING GUIDELINES
10115I
Ground Bus
Ground
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