System Definition ReviewNASA Wireless Smart Plug

Experimental Control Logic Labs

September 19th, 2012

2SDR Agenda1.Team Members

2.Vision, Mission, Goal and Objectives of Project

3.Concept of Operations

4.System Architecture (includes system definition, concept and layout)

5.Level 1 Requirements

6.Traceability of requirements “flow down”

7.Work Breakdown Structure (WBS)

8.Technical Assessment

9.Preferred system solution definition

10.Preliminary functional baseline

11.Preliminary system software functional requirements

12. Risk assessment and mitigations approach

13. Design & Analysis tools to be used

14. Cost and schedule data

15. Hardware & Software Test Matrix

Team Members 3

Dr. Joseph MorganMISL Director

Dr. Jay PorterCapstone Advisor

Paul DelauneNASA Technical

Subject Matter Expert

MISL Team

Akeem Whitehead Project Manager

Derek GarseeSoftware Engineer

Jeffrey JordanHardware Engineer

Christian CarmichaelSystems Integration

Engineer

Matthew LeonardNASA Liaison

Capstone Team

4Mission Goals and ObjectivesCreate a control/monitoring system for DC power distribution on NASA Deep Space Habitat (DSH)

Remotely configurable from Master Control Software (MCS)

Automated monitoring and control of current draw

5Concept of Operations

• NASA Wireless Smart Plug (NWSP) is a proof-of-concept prototype

• Installed in the Deep Space Habitat (DSH) mock-up for testing and evaluation purposes only (not space qualified)

• Used to monitor and control power usage of DSH and its installed equipment

• Monitor current draw from targeted device, and define actions based on measurement (i.e. wireless communication, emergency disconnect, load shedding).

6

System Architecture

Nivis VersaRouter 900 Master Control

1 sample/secondISA100.11aIEEE 802.15.4

NASA Wireless

Smart Plug

DSHNetwork

Typical Device

Windows OSLabVIEW GUI

120V-DCand/or

28V-DC

120V-DCor

28V-DC

7

System Architecture

Nivis VersaRouter 900 Master Control

1 sample/secondISA100.11aIEEE 802.15.4

NASA Wireless

Smart Plug

DSHNetwork

Typical Device

Windows OSLabVIEW GUI

120V-DCand/or

28V-DC

x5

120V-DCor

28V-DC

8System Breakdown

NWSP

Sensing & Control

MSP430F5438

Wireless Communications

VersaNode 210 VersaRouter 900

Client Software

LabVIEW GUI Configuration & Display

9Level 1 System RequirementsPower Control

Support for 120V/28V DC Near real-time monitoring/control Fail safe Windows based master control client

Communications Wireless configuration, control, monitoring and reporting Data rate: 1 sample/second Use a Nivis VN210 radio Support a Nivis VR900 router Standards: UART, ISA 100.11a

Form Factor & Fit Small form factor Cannon-type connector Integration with DSH Deliver five NWSP units for evaluation

Requirements Flow Down 1/3

Power Control

Voltages Monitor Fail Safe Threshold GUI

28VDC

120VDC

0 to 5A

3% Full Scale

0 to 5A

0.1A Inc.

Trips

Standalone Executable

Windows OS

10

Requirements Flow Down 2/3

Communications

Data Rate Equipment Protocol

1 sample/s

Trip Within 3s

Nivis VN210

Nivis VR900

ISA100.11a IEEE 802.15.4

UART

11

Requirements Flow Down 3/3

Form Factor & Fit

Size Integration

3” x 3” x 3”

Cannon-type Connector

5 NWSP

DSH Install

12

13

Project Work Breakdown Structure Overview 1/9

Total # of Boxes: 147 Project = 1 Phases = 7 Activities = 21 Tasks = 51 Sub-Tasks (Terminal Element) = 67

Total # of Work Packages: 106

14WBS Phase Level 2/9

15WBS 1.0 Research 3/9

16WBS 2.0 Design 4/9

17WBS 3.0 Simulation 5/9

18WBS 4.0 Implementation 6/9

19WBS 5.0 Testing 7/9

20WBS 6.0 Documentation 8/9

21WBS 7.0 Close-out 9/9

• All documents, development tools, and code will be transferred to MISL for final systems integration and deployment with NASA DSH

22

Technical Assessment: Current SensorDevice Pros Cons Cost

ACS714 • Hall Effect• Small packaging• 5 v input voltage• 5A range

• 100 mV/A output $3.89

ACS754 • Low power loss• 1.2% full scale

error• Higher load

capacity

• 50 A range• 10 mV/A output• Relatively

expensive

$7.00

ACS759 • Low power loss• Quick response

time• Higher load

capacity

• Relatively low accuracy

• 56 mV/A output• 12.5 A range

$7.00

23Preferred System SolutionProcessor

MSP430F5438

Wireless Communication VersaNode 210 VersaRouter 900

Current SensingACS714

PowerSwitching: G9EA-1 DC Power RelaysRegulation: TI TL783 Linear Regulator

Client Software LabVIEW

24Preliminary Functional Baseline Functional Block Diagram

25Power Budget

Device Max Current DrawVersaNode210 60 mAMSP430F5438 312 uAACS714 Current Sensor IC 13 mAVoltage Regulator  120V-DC Enable CircuitSelection CircuitVoltage Measurement Circuit

Preliminary System Software Functional Requirements

26

• Master Control Unit• Communicate wirelessly with NWSP• Add/Configure NWSP units• Receive and display NWSP information

• NWSP• Receive parameters from MCS• Perform auto disconnect• Control and monitor power usage• Report current draw to MCS

27MCS Example GUI

28

PMI Risk Management Process

• Identify

• Evaluate

• Develop Response

• Control

29Risk Prioritization Matrix

Priority Total Overall Risk Comparison

3 3 High1. Project goes overschedule

5 1 Low2. Injury or damage from

120V source12

6 0 Low 3. Funding delayed1 2

3 3

1 5 High4. Delay in parts

procurement.1 2 34 4 4

2 4 High5. Solving 120V/28V

available power problem1 2 3 45 5 5 5

4 2 Medium6. Limited financial

resources1 2 3 4 56 6 6 6 6

30Risk Evaluation

PROBABILITYOF

OCCURRENCE

SEVERITY OF IMPACT

LOW HIGH

HIGH

LOW

5 4

6 1

3 21. Project over-schedule2. Injury/damage from 120V3. Funding delayed4. Delay in parts5. Solving 120V step-down6. Limited financial resources

Legend

31Design & Analysis Tools to be UsedNI Multisim

Simulation

OpNet Simulation

NI Ultiboard PCB design

LabVIEW GUI

Inventor Enclosure

Code Composer Studio MSP430 Programming

Capstone Design Tools

32Preliminary Cost Budget

NASA Cost Sharing• Labor $40,915 • Travel $3,000• Equipment $5,000 (TI)• ODCs $5,000• Overhead/Indirect $22,501

(TAMU)_____________________________________________ Total Cost to Sponsor $48,915 $27,501

33Schedule

Research

Design

Simulation

Implementation

Testing

Documentation

Close-out

28-Aug-12 17-Oct-12 6-Dec-12 25-Jan-13 16-Mar-13 5-May-13

11/1/12

11/25/12

4/17/13

4/18/13

4/29/13

5/6/13

5/10/13

NWSP Gantt Chart

Duration

Ph

ase

34Test Matrix

35NASA DeliverablesDate Activity Deliverable1/8/12 Kickoff Meeting Draft System Design Process (SDP)19/9/12 SDR Presentation

Power Point SlidesVideo

24/10/12 PDR PresentationPower Point SlidesVideo

5/12/12 CDR PresentationPower Point SlidesVideo

10/12/12 Final SDP ReportWeekly Project Status Meetings13/2/13 Progress Checkpoint #1 Presentation and PPT Slides

Alpha SchematicAlpha Board LayoutSoftware Hierarchical ChartsTest Matrix

5/3/13 Final Design Review Presentation and PPT Slides3/4/13 Progress Checkpoint #2 Final Schematics

Final Board LayoutSoftware Flow ChartsTest Plan

15/5/13 Progress Checkpoint #3 Final Demonstration 20/5/13 Final Presentation Final Report

Five Smart Plugs15/6/13 Integration with DSH Field Test Plan15/8/13 DSH Integrated Testing Field Test Report15/9/13 Final Acceptance 

36Questions/Comments

37Clarifications How many measurements per observation

i.e. multiple array of values versus a single value) How long is the measurement process to remain active

considering 1 sample/second Multiple measurement analysis

i.e. averaging, sliding windows, statistical, etc. How will the limits be defined

i.e. 2.9A is devices actual limit, 3.0A is the ideal limit, trip occurs at 3.1A threshold

Trip response? i.e. circuit breaker, fast-blow fuse, slow-blow fuse, etc.

How many NSWP devices will be used in actual implementation of DSH? 8-bits of addressing versus 64-bits of addressing