Loop Checking - A Technician's Guide by Harley M. Jeffery

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By Harley M. Jeffery

In today’s aggressive markets, brands attempt to repeatedly enhance production functionality to satisfy their enterprise wishes and ambitions. As method regulate loops have an immense influence on a plant’s monetary functionality, concentrating on loop functionality is important. This technician’s advisor defines loop checking within the broader scope of regulate loop functionality as well as the extra conventional phrases of the plant startup. It discusses common tools and practices that may be utilized throughout many processes/industries. Featured themes contain loop checking fundamentals, manufacturing facility reputation checking out, wiring and loop exams, functionality benchmarking, and maintaining functionality.
entrance topic
• Preface
• desk of Contents
1. creation to Loop Checking
2. The manufacturing unit attractiveness try out
three. Start-up
four. functionality Benchmarking
five. maintaining the functionality
• Acronyms

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A veteran of a recent large job informed the author that tens of thousands of dollars in time and equipment had been spent only to find one bad transmitter and two with an incorrect range. Technicians check the control valve in much the same way as the transmitter: at 0-25-50-75-100% steps. Again, the field team member should note any installation discrepancies since studies have shown that valve installation and setup issues can result in start-up delays and ongoing performance problems (Ref. 5).

3 Procedures – a form-based procedure or checklist is helpful that can be documented per the Section 2 methods. Using control system diagnostics, verify that all internal “health” checks are good. With diagnostics or test configurations, set/measure signals to each I/O card and verify at the operator interface. Test any redundancy features such as controllers and communication networks to verify proper switchover. After this test procedure is completed and accepted - declare victory and sign off the system as ready for configuration checks!

1 General – note the forms to be used and how the test personnel are to indicate test items as complete, unsuccessful – rework required, open for resolution, and so on. 2 Detail reporting instructions on how the deficiencies should be categorized, what the corrective action should be and expected result, and how to verify the result. 1 Purpose – general statement as to how you will check the hardware pieces – usually a document or drawing is listed as the reference. 2 Test Equipment – list any test equipment required.

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