Safety Considerations Guide for Trident v2 Systems - TUV ...
Safety Considerations Guide for Trident v2 Systems - TUV ...
Safety Considerations Guide for Trident v2 Systems - TUV ...
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36 Chapter 3 Fault Management<br />
Types of Faults<br />
External Faults<br />
Internal Faults<br />
A controller is subject to both external faults and internal faults, which are reported by:<br />
• The status indicators on a module’s front panels<br />
• The Triconex Enhanced Diagnostic Monitor<br />
• System attributes on the Controller Panel in the TriStation 1131 software<br />
A controller may experience the following types of external faults:<br />
• Logic power faults<br />
• Field power faults<br />
• Load or fuse faults<br />
When an external fault occurs, the controller illuminates the yellow indicator on the faulting<br />
I/O module and the Field Power or Logic Power alarm indicators on the Main Processors and<br />
the System Alarm. The Triconex Enhanced Diagnostic Monitor identifies the faulting module<br />
by displaying a red frame around it. When these conditions occur, the faulting module’s power<br />
supplies and wiring should be examined.<br />
Internal faults are usually isolated to one of the controller’s three channels (A, B, or C). When an<br />
internal fault occurs on one of the three channels, the remaining two healthy channels maintain<br />
full control. Depending on the type of fault, the controller either remains in TMR mode or<br />
degrades to dual mode <strong>for</strong> the system component that is affected by the fault. For more<br />
in<strong>for</strong>mation about operating modes, see Operating Modes on page 37.<br />
When an internal fault occurs, the controller illuminates the red Fault indicator on the faulting<br />
I/O module and the System alarm on the Main Processors to alert the operator to replace the<br />
faulting module.<br />
<strong>Safety</strong> <strong>Considerations</strong> <strong>Guide</strong> <strong>for</strong> <strong>Trident</strong> <strong>v2</strong> <strong>Systems</strong>