By Anthony Moody Rhys Porter Nicolas Wilson. Background Objectives Design Normal Operation ...
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Transcript of By Anthony Moody Rhys Porter Nicolas Wilson. Background Objectives Design Normal Operation ...
![Page 1: By Anthony Moody Rhys Porter Nicolas Wilson. Background Objectives Design Normal Operation Logic Failure Issues and solutions Improvements.](https://reader034.fdocuments.net/reader034/viewer/2022051621/56649ec85503460f94bd597f/html5/thumbnails/1.jpg)
Project 1 – Level Crossing
By Anthony MoodyRhys Porter
Nicolas Wilson
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Background Objectives Design Normal Operation Logic Failure Issues and solutions Improvements
Overview
![Page 3: By Anthony Moody Rhys Porter Nicolas Wilson. Background Objectives Design Normal Operation Logic Failure Issues and solutions Improvements.](https://reader034.fdocuments.net/reader034/viewer/2022051621/56649ec85503460f94bd597f/html5/thumbnails/3.jpg)
Level Crossing: Flags as indicators Patent of Level Crossing Electronic Bells Cross-Buck “X” sign
Background
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12 Digital Inputs 4 Inputs able to run as analog 6 Relay Outputs LCD Display Operating Buttons
Moeller 719-DC-RC
Functions:
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Design and Implement a Level crossing using analogues available in the lab and Moeller
Fail safely and appropriately handle exceptional cases
Objectives
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Fail Safe Moeller Easy “PLC” Power Supply Strobe Light as bells
Design
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Proximity Based Train Detection Safety Conscious Design Verbose Fault/Warning Memory for
Diagnosis and Reporting Some Automatic Fault Recovery Intersection Obstruction Detection 10 effective outputs from 6 SSRs Emergency Stop Fail Safe on Controller Power Loss
Key Features
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Output Wiring Diagram
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Normal Operation Wait for train Trigger warning lights Lower boom gates Set train lights accordingly throughout As train leaves do in reverse order
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Logic
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Zone Based pseudoLogic
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Simplified Underlying Logic
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Loss of power to controller Sensor failure (boom gates) Emergency switch Obstructed intersection Train detection failure Erroneous train signals to boom gate
Failure & Exceptional Cases
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Issue & Solutions Issue:
Limited outputs Solution:
Use external transistor with diode or gate
Issue: Potentiometer too sensitive
Solution: Use rheostat in series with resistor
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Moeller Expansion Module if required Active monitoring to larger control system
Possible Improvements
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HHSF & Questions