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WCBI Team Information

Team number: Client: Faculty Advisors: Technical Advisors: Team Members:. May02-11 Square D Company (Greg Wiese) Glenn Hillesland James Triska Mani Mina Steve Russell Fahad Azeem Matt Hensler Neil Peterson Greg Stamp. WCBI Team Information. Presented on March 12, 2002.

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WCBI Team Information

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  1. Team number: Client: Faculty Advisors: Technical Advisors: Team Members: May02-11 Square D Company (Greg Wiese) Glenn Hillesland James Triska Mani Mina Steve Russell Fahad Azeem Matt Hensler Neil Peterson Greg Stamp WCBI Team Information Presented on March 12, 2002

  2. Presentation Outline • Problem Statement • Design Objectives • End Product Description • Assumptions • Limitations • Risks and Concerns • Technical Approach • Technical Design • Milestones • Accomplishments • Future Work • Human Effort and Financial Budgets • Lessons Learned • Summary • Questions

  3. Problem Statement Many industrial circuit breakers use trip units and Breaker Communication Modules (BCMs) Communication requires direct connection Interrogation cumbersome and inefficient Problems with faulty wiring Need for wireless approach in improving communication with trip units

  4. Design Objectives Wireless communication device for each BCM Attaches to circuit breaker Wireless communication device for the laptop connected via serial port Operates in an industrial environment Used by Square D

  5. End Product Description WCBI will consist of: • Laptop coupled with wireless communication device • Circuit breaker with BCM, trip unit, wireless interface WCBI will be able to: • Improve efficiency of obtaining breaker settings • Demonstrate interrogation of at least two devices • Operate in a range up to 30 feet

  6. Assumptions • Wireless link will be immune to interference in an industrial environment • Transmitters/Receivers will not interfere with each other • WCBI will work at distance up to 30 feet • 24-volt DC BCM power supply sufficient for wireless hardware

  7. Limitations • Interrogation of only 247 BCMs under MODBUS protocol • 24-volt power supply only available power • Device must attach conveniently to circuit breaker • Device attached to laptop should weigh less than 3 lbs.

  8. Risks and Concerns • Lack of input from client • Square D changing the design requirements • Hardware design not operating correctly • Not finishing on time

  9. Technical Approach • Wireless modems - too expensive • Infrared - line of sight • Build our own wireless devices • Frequency bands: 315 MHz, 900 MHz, 2.4 GHz • ASK vs. FSK Initial Design

  10. Technical Design Existing System

  11. Technical Design Cont’d. 4 Wire, RS485 MODBUS baud = 4800, 9600, 19.2K Proposed WCBI INFRARED Wireless Transceiver RS-485/RS-232 Converter Wireless Transceiver MODBUS DRIVER 4 Wire, RS485 MODBUS baud = 4800, 9600, 19.2K INFRARED Wireless Transceiver

  12. Technical Design Cont’d. • RF IC’s use FSK and operate in the 900 MHz ISM band (unlicensed) • Transmits at ~920 MHz, Receives at ~905 MHz • Easier to implement as full duplex although unnecessary • Just a wire replacement • Can use current software • No need to worry about error control and addressing for hardware design

  13. Technical Design Cont’d. Wireless Transceiver Logic/485 RX1 905 MHZ 485/Logic TX1 TX 485/Logic RS485/ RS232 920 MHZ RX Logic/485 Logic/485 RX2 TX2 485/Logic Computer End Circuit Breaker End

  14. Milestones • Decide on wireless communication method • Design circuit • Order parts and equipment • Assemble circuits • Insure wireless system successfully interrogates two trip units

  15. Accomplishments • Met class requirements • Trip to Square D • Completed design • Purchased circuit components

  16. Future Work • Improve on current software • Increase range • Removal of RS 485/RS 232 conversion, or use USB • Use transceiver chips (half duplex) instead of a receiver and transmitter (full duplex)

  17. Original Effort Estimate Personnel Revised Effort Estimate Actual Effort To Date Greg Stamp 56 hrs. 110 hrs. 82 hrs. Matt Hensler 57 hrs. 80 hrs. 69 hrs. Fahad Azeem 52 hrs. 75 hrs. 61 hrs. Neil Peterson 55 hrs. 90 hrs. 74 hrs. Totals 220 hrs. 355 hrs. 286 hrs. Human Effort

  18. Original Budget Estimate Item Revised Budget Estimate Actual Expenses To Date Equipment and Parts  $400 $300 $90 Telephone and Postage $5 $5 $0 Printing $50 $50 $40 Totals  $455 $355 $130 Financial Budget

  19. Lessons Learned • Communication is critical • Assigning specific tasks improves efficiency • Working around conflicting schedules • Need to be flexible, have several design options

  20. Summary • Wire replacement • Eliminates physical connection between the laptop and the circuit breakers • Operates in the 900 MHz ISM band • Makes interrogation convenient

  21. Questions Anyone?

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