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WCBI Team InformationWCBI Team InformationTeam number:
Client:
Faculty Advisors:
Technical Advisors:
Team Members:
May02-11
Square D Company(Greg Wiese)
Glenn HilleslandJames Triska
Mani MinaSteve Russell
Fahad AzeemMatt HenslerNeil PetersonGreg Stamp
Presented on March 12, 2002
Presentation OutlinePresentation 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
Problem StatementProblem 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
Design ObjectivesDesign 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
End Product DescriptionEnd Product DescriptionWCBI 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
AssumptionsAssumptions
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
Limitations 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.
Risks and ConcernsRisks and Concerns
Lack of input from client
Square D changing the design requirements
Hardware design not operating correctly
Not finishing on time
Technical ApproachTechnical 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
Technical DesignTechnical Design
Existing System
Technical Design Technical Design Cont’d.Cont’d.
Proposed WCBI
Wireless Transceiver
Wireless Transceiver
4 Wire, RS485 MODBUS
baud = 4800, 9600, 19.2K
4 Wire, RS485 MODBUS
baud = 4800, 9600, 19.2K
INFRARED
INFRARED
RS-485/RS-232 Converter
MODBUS DRIVER
Wireless Transceiver
Technical Design Technical Design Cont’d.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
Technical Design Technical Design Cont’d.Cont’d.
Wireless Transceiver
RX
TX1
RX1
TX
Logic/485
485/Logic
Logic/485
485/Logic
RS485/ RS232
TX2
RX2
Logic/485
485/Logic
905 MHZ
920 MHZ
Computer End Circuit Breaker End
MilestonesMilestones
Decide on wireless communication method
Design circuit
Order parts and equipment
Assemble circuits
Insure wireless system successfully interrogates two trip units
AccomplishmentsAccomplishments
Met class requirements
Trip to Square D
Completed design
Purchased circuit components
Future WorkFuture 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)
Human EffortHuman Effort
Personnel Original Effort Estimate
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.
Financial BudgetFinancial Budget
ItemOriginal Budget
Estimate
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
Lessons LearnedLessons Learned
Communication is critical
Assigning specific tasks improves efficiency
Working around conflicting schedules
Need to be flexible, have several design options
SummarySummary
Wire replacement– Eliminates physical connection between the laptop and the
circuit breakers
Operates in the 900 MHz ISM band
Makes interrogation convenient
Questions Anyone?Questions Anyone?