Intro To Electrical Fall 2010

1. Intro To Electrical Fall 2010 Introduction to 2010 Control system and Electrical basics

2. Rules? YES! SAFETY FIRST Gracious professionalism Ask Questions FUN!

3. OVERVIEW • Control System (what is what) • Other Electrical • Electrical Theory • Design • Build • Test • Where to get information?

4. Important 2011 Season Dates • Nov. 20, 2010 - FIRST WA Workshops • Jan. 8, 2011 - KICKOFF (MLT & Auburn High) • Feb. 22, 2011 - SHIP Robot • Mar. 20 – Mar. 22, 2008 • Cascade and Olympic Microsoft Regionals • At Qwest Exhibition Center??

5. Control System (what is what) • cRIO (National Instruments) • Sidecar • Power Distribution Board • cRIO Modules • Jag/Victor • Spike • Sensor

6. cRIO

7. Sidecar

8. Power Distribution Board

9. cRIO Modules

10. Tan Jaguar Motor Controller

11. Victor Motor Controller

12. Driver’s Station 2009

13. Driver’s Station 2010

14. 2010 Power Distribution Diagram

15. 2010 Robot Connectivity Data Diagram

16. Other Electrical • KOP = Kit Of Parts. KOP is delivered to each team by mail or at kickoff • Electrical motor (CIM, Fisher-Price, etc) • Wiring considerations • Routing

17. Wiring considerations • What size wire will you use? Google AWG • What color? Read Section 8-The Robot Rule <R48> and others • Where is it going from and to? How will I get it there? Will it pass a vulnerable area? How will I protect it? • Modular design? It almost always pays off so what is it?

18. Routing • Routing is the art of cleanly and simply securing wires, hoses, chains and keeping them out of harm’s way. • Routing considers what else needs to be in the same area and protects the items • Routing considers the priority; Will the robot run SAFELY if this wire/air line is cut? • Often happens last! • Routing takes into account the need for changes during competition and allows for easy access

19. Modular Design • Has modules that can be removed from the robot easily • Usually has connectors so it is plug and play • Allows for off robot build and test • cRIO’s are expensive! • Buy extra connectors: cRIO power, module power

20. Design • Use lessons from past experience –Lessons learned document? • Develop a plan • Review the plan with experienced person • Document the plan and communicate with other groups like software and chassis to make sure they have the information they need. Include drawings! • Update the plan as changes occur. Communicate with other groups as to what changed and how it affects them.

21. Electrical Theory • Electrical Definitions • Current Flow & Color Coding • Ohm’s Law • Formulas • Ask a mentor!

22. Electrical Definitions • Voltage (V-Volts) – The energy-transfer capability of a flow of electric charge (potential difference). • Current (I-Amps) – The net rate of flow of positive charges. • Resistance (R-ohms) – The characteristic of the conductor to carry current defined by Ohms law. • Battery – Stored chemical energy. • Electrical Circuit – Closed loop which current flows. • Wire – Insulated conductor to connect electrical components

23. Current Flow & EHS FIRST Wire Color Code • Current flows from the highest potential to the lowest potential thru a conductive element. • Red Wire = Positive (Power) • Black Wire = Negative (Ground) • White = Control Circuit

24. Ohm’s Law • Ohm’s law in honor of Georg Ohm, the German physicist, whose original experiments led to the simple relationship between voltage, current and resistance. • V = R * I

25. Formulas • OHMS LAW - V = I * R or R = V/I • Kirchoff’s Voltage Law (KVL): • Sum of voltages around closed loop = 0 • Kirchoff’s Current Law (KCL): • Sum of currents entering node = 0 • Resistance in series – R(total) =R1+R2 • Resistance in parallel – R(total)=R1*R2/(R1+R2) • Power – P=V*I • Voltage Divider – V(out)=V(in)*R2/(R1+R2)

26. Motor curves

27. Build • WEAR safety glasses • Assembly the robot using correct techniques • This will ensure the robot will work during competition.

28. Build 2 • Things to watch for:+ mis-wiring-ground into power or signal into power or ground+incorrect voltage for the device+ pinched wires+ powering up before everything is ready+ wires rubbing against sharp edges+ ground wire connected to power+ ANY safety hazard

29. Test/Troubleshooting • Organize your documentation & Read it! • Be cautious-know what voltage is required • CHECK is that voltage being supplied before connecting it to the device • Swap out parts to see if it is just a bad part • Experience is a great teacher-write down your lessons learned

30. Volunteer to learn more! • FRC field reset • FRC robot inspector • FLL or FTC • Outside of FIRST

31. Appendicies A – Electrical Tools Photo Glossary B – Information Sources C – Crimp Tool Adjustment

32. Appendix A Electrical Tools Photo Glossary

33. Example of terminal kit

34. Meters

35. Fluke 89 series IV

36. Fluke 112

37. Fluke 29

38. Fluke 336 clamp on Ammeter

39. Radioshack

40. Fluke 80T-IR/E

41. Watts Up meter in protective case

42. Tools 1 Needle nose pliers Screwdriver Diagonal Cutters

43. Tools 2

44. Crimper

45. Crimper

46. Crimper

47. Crimper

48. Crimper

49. Crimper

50. Crimper