Global Plant Engineering - October 2010 - (Page 29)

Plant Maintenance a SCADA system. The eight-step plan outlined here can be developed and applied as time allows. You can start with just a pencil and paper and commonly available tools while focusing on a single system or process. 1. Plot the process Start by drawing a diagram of the system of interest and its core processes. You don’t need to break out a drawing program like Visio yet (though you may want to eventually); a “back of the envelope” drawing that captures the core processes in the system is enough to get started. 2. Identify key components Next, identify the key components in each process. Key components will vary by industry, but some key components of many industrial processes that you’ll want to consider are: • Motors • Variable Frequency Drives • Sensors • Power Supplies (especially the supplies that provide power to sensors) • Electromechanical devices (actuators, valves, etc.) • I/O modules and switches • Cabling and interface junctions Metric Voltage Current Power Signal Integrity (amplitude, time, frequency, distortion, and disturbances) Electrical disturbances (externally induced) • Electrical noise • Electrical transients • Electrical harmonics Insulation Resistance Grounding Vibration Heat Environment • Humidity • Temperature • Pollutants Measurement Tool Digital multimeter, clamp meter, process tools, electrical tester Digital multimeter (with or without clamps), clamp meter, milliamp clamp meter,), loop calibrators, and process meters Power quality analyzer, power quality recorder, power recorder, or (by calculation) digital multimeter or clamp meter Digital multimeter Power quality analyzer, power quality recorder, power recorder, logging multimeter Insulation tester, leakage clamp meter Earth ground tester, earth ground clamp meter Vibration tester Contact thermometer, infrared thermometer, thermal imager Temperature-humidity meter, particle counter, carbon monoxide meter • Switch gear and breaker panels • Operator interfaces (such as control panels) 3. Assign metrics for key components For each of the key components that you identified in the previous step, identify some “operational metrics”. These are that you can measure that reveal important information about the state of the component. Good candidates for metrics are information about a component that: • You can measure easily • You can gather at a single point in time (for example, meter measurements, waveform captures, observations, and photos) • Capture relevant quantitative information (for example, a temperature measurement) or

Table of Contents for the Digital Edition of Global Plant Engineering - October 2010

Global Plant Engineering - October 2010
Contents
Comment
Global Views
Hannover Messe Report
Asia Report
Americas Report
Winning the Race Against Equipment Failure
Take 8 Steps to Debug Process Control System
Optimize the Enterprise: Measurement, Empowerment, and Control are the Essential Ingredients
Air Apparent: Compressed Air Audits Let You Find the Leaks in Your System
The Promise of the Smart Grid: A Flexible, Dynamic Energy Management System
Europe Report

Global Plant Engineering - October 2010

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