Safety Considerations Guide for Triconex General ... - ICEWeb
Safety Considerations Guide for Triconex General ... - ICEWeb
Safety Considerations Guide for Triconex General ... - ICEWeb
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18 Chapter 2 Application <strong>Guide</strong>lines<br />
Emergency Shutdown Systems<br />
The safe state of the plant should be a de-energized or low (0) state.<br />
All power supplies should be monitored <strong>for</strong> proper operation.<br />
Burner Management Systems<br />
The safe state of the plant is a de-energized or low (0) state.<br />
When a safety system is required to con<strong>for</strong>m to the EN 50156 standard <strong>for</strong> electrical equipment<br />
<strong>for</strong> furnaces, PES throughput time should ensure that a safe shutdown can be per<strong>for</strong>med within<br />
one second after a problem in the process is detected.<br />
Fire and Gas Systems<br />
Fire and gas applications should operate continuously to provide protection. The following<br />
industry guidelines apply:<br />
• If inputs and outputs are energized to mitigate a problem, a PES system should detect<br />
and alarm open and short circuits in the wiring between the PES and the field devices.<br />
• An entire PES system should have redundant power supplies. Also, the power supplies<br />
that are required to activate critical outputs and read safety-critical inputs should be<br />
redundant. All power supplies should be monitored <strong>for</strong> proper operation.<br />
• De-energized outputs may be used <strong>for</strong> normal operation. To initiate action to mitigate a<br />
problem, the outputs are energized. This type of system shall monitor the critical<br />
output circuits to ensure that they are properly connected to the end devices.<br />
<strong>Safety</strong> <strong>Considerations</strong> <strong>Guide</strong> <strong>for</strong> <strong>Triconex</strong> <strong>General</strong> Purpose v2 Systems