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Remote monitoring control

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Remote monitoring control

  1. 1. Remote Monitoring and Control of Landfill Systems SWANA 2005 Winter Conference Presented by: Curtis D. Madsen, P.E. David L. Boudry, Master Electrician Integrated Environmental Solutions
  2. 2. Background Landfill (LF) leachate management in the past: Isolated control panels at each device Typical devices: – – – – – Leachate sump pumps Transfer pump recirculation areas Actuator valves Leachate tank load-out facilities Wet wells/Lift stations pumping to treatment plants
  3. 3. Background (cont.) Site visit required to: – Assess operational status (is it running?) – Troubleshoot problems – Make adjustments to control settings Sensitive to lightning strikes and “downtime” Recently, use of programmable logic controller (PLC)−based control systems
  4. 4. Background (cont.) PLC-based systems: – Are Cost effective – Typically require less downtime compared to previous controls – Are less labor intensive – Can be networked together – Enable “real-time” monitoring, troubleshooting, and adjustments to set points
  5. 5. Basic Controller Logic
  6. 6. Historical Applications Typical control technology historically used at landfills has included: Side slope riser sump pumps – Typical controllers: Printed circuit boards with transducers Load-sensing controllers – Site visit required to make adjustments/record data/troubleshoot – Data availability limited – Sensitivity to lightning strikes
  7. 7. Historical Applications (cont.) Leachate load-out tanks/force-main facilities – Typical controls Same as SSR pumps Float switches – Site visit required to make adjustments/record data/troubleshoot
  8. 8. Historical Applications (cont.) Other components – – – – – Data availability limited Leachate distribution/recirculation pumps Fail-safe valves Leachate head wells All require site visit to make adjustments/record data/troubleshoot
  9. 9. PLC Applications What is a PLC? – Microprocessor, similar to that found in a PC, calculator, or your automobile – Extensively used to control manufacturing and treatment processes – Programmable, accepts directions, calculates, stores data, gives commands to other equipment – Can also accept directions: Notification of alarm levels Types of events to record
  10. 10. PLC Applications (cont.) PLC can be programmed to: – Track selected data and functions (reducing the effort required to complete an annual environmental monitoring report) – Notify selected personnel of an alarm condition PLC-based control systems allow the efficient and flexible use of a Supervisory Control and Data Acquisition (SCADA) system
  11. 11. PLC Applications (cont.) What is SCADA? SCADA enables a site operator to monitor and control processes from a remote location – Used to monitor and control any type of mechanical and electrical equipment at LF facilities
  12. 12. PLC Applications (cont.) A properly designed SCADA system reduces labor costs by minimizing site visits for: – Inspection – Data collection/logging – Making adjustments PLC/SCADA systems allow: – Real-time monitoring from your PC system – settings and modifications – Troubleshooting from your PC – Increased equipment life – better preventive maintenance – Automatic report generating feature
  13. 13. PLC Applications (cont.) Applications of PLCs are the same as the other control devices presented earlier
  14. 14. Controller Comparison Four general types of controllers used at landfills: – Relay logic – Load sensing – Printed circuit boards – Programmable logic controller
  15. 15. Controller Comparison (cont.) Network operation expands system flexibility to include: – – – – – Pump run time Motor cycles Motor amperage Condition of motor starter Position of H-O-A switch
  16. 16. Controller Comparison (cont.) – Ability to assess many fault conditions from an Internet connection (office PC) – controls response/repair costs – Recording of fault history log – Daily data log (head levels) – Flare run/shutdown log – Remote determination on condition of the device, the H-O-A Switch (if “manual” or “off” or “auto” setting)
  17. 17. Controller Comparison PLC Printed Relay Load Circuit Logic Sensing Board
  18. 18. Controller Comparison PLC Printed Relay Logic - Stand-alone device - Float controlled - Only does one thing - No communication ability Load Sensing Circuit Board
  19. 19. Controller Comparison Load Sensing - Control based on amp draw of motor - Stand-alone device - Only does one thing - No communication ability Relay Logic - Can be confused by voltage fluctuations - Time based feature does not account for heavy rains or seasonal changes PLC Printed Circuit Board
  20. 20. Controller Comparison Printed Circuit Boards - Controlled by pressure transducer - Stand-alone device Relay Logic Load Sensing - Controller may provide "indication" of liquid level - May have limited communication ability PLC
  21. 21. Controller Comparison Programmable Logic Controller - Uses one or several, various sensors (e.g., transducer) to operate a device (e.g., pump) - Operate as “stand-alone” or as part of a “network” Printed Relay Load Circuit Logic Sensing Board - Stand-alone operation provides run time, pump cycles, and fault codes via in-field operator interface - Can operate as a network from an Internet connection (office PC)
  22. 22. Summary Points of Comparison Basic operations logic – Minimal at best, for non-PLC controller Controller adjustability – Minimal at best, for non-PLC controller System troubleshooting – PLCs have a “fault code” system; other devices do not
  23. 23. Summary Points of Comparison (cont.) Remote location requirements – Non–PLC-based systems require site visit to assess operation status, troubleshoot, or gather data – With PLCs and SCADA, information can be accessed from your office PC (or any Internet connection with Web-based SCADA) Advanced database/reporting/monitoring capabilities – Only available with PLCs and SCADA
  24. 24. Cost Cost of PLC System is based on: How many devices require control Areal size of a facility – Networking capability of PLC devices can control labor costs – Fiber optic or Ethernet radio options (lightning strike protection) are available Types of data required for daily operations – Run time of pumps recirculating leachate
  25. 25. Costs (cont.) Types of environmental monitoring reports required Competition among manufacturers – Several marketplace manufacturers help to control costs of PLCs
  26. 26. Screen Demonstration Closing Comments Questions/Applications
  27. 27. Screen Demonstration Closing Comments Questions/Applications
  28. 28. Screen Demonstration Closing Comments Questions/Applications
  29. 29. Screen Demonstration Closing Comments Questions/Applications

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