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.
Summary of Contents for Trident
Page 1: ...Trident Version 1 2 Triconex An Invensys Company Planning and Installation Guide ...
Page 10: ...x Contents Trident Planning and Installation Guide ...
Page 16: ...xvi Training Trident Planning and Installation Guide ...
Page 53: ...Main Processor Module 37 Chapter 3 System Description Model 2101 Main Processor Baseplate ...
Page 140: ...124 Covers Trident Planning and Installation Guide ...
Page 216: ...200 Replacing Modules Trident Planning and Installation Guide ...
Page 238: ...222 Diagread Cables and Debug Connectors Trident Planning and Installation Guide ...
Page 240: ...224 Trident Planning and Installation Guide ...
Page 248: ...232 Trident Planning and Installation Guide ...
Page 264: ...248 Glossary Trident Planning and Installation Guide ...
Page 274: ...258 Index Trident Planning and Installation Guide ...