Effective Grounding Methods 149
Chapter 4 Installation and Maintenance
Effective Grounding Methods
You should permanently connect the Trident system to a protective earth in order
to:
• Protect operations and maintenance personnel from electrical shock
• Protect the system from damage or malfunction caused by lightning or other
electrical noise transients
Ground Systems
The Trident has the following four, separate ground systems:
• Protective earth —an AC safety ground
• Field ground F—a functional earth
• Logic ground L—a functional earth
• Shield ground S—a functional earth
The logic and field portions of each module use separate, isolated signal return
paths. Each is connected to its own functional earth. The metallic portions of the
safety ground act as an electrostatic shield for the internal circuitry.
Communication cable shields are terminated to the safety ground. The metallic
portions of the Trident controller are connected to the protective earth.
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