ECET 211 Electric Machines & Controls Lecture 2-2 (Part 2 of 3) Symbols and Drawing for Electric Motor Control Systems

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1 ECET 211 Electric Machines & Controls Lecture 2-2 (Part 2 of 3) Symbols and Drawing for Electric Motor Control Systems Text Book: Chapter 2. Understanding Electrical Drawings, Electric Motors and Control Systems, by Frank D. Petruzella, published by McGraw Hill, Paul I-Hai Lin, Professor of Electrical and Computer Engineering Technology P.E. states of Indiana & California Dept. of Computer, Electrical and Information Technology Purdue University Fort Wayne Campus Prof. Paul Lin 1 2. Symbols and Drawings for Electric Motor Control Systems Chapter 2. Understanding Electrical Drawings Part 1. Symbols-Abbreviations-Ladder Diagram Part 2. Wiring Single Block Diagrams Part 3. Motor Terminal Connections Part 4. Motor Nameplates and Terminology Part 5. Manual and Magnetic Motor Starter Prof. Paul Lin 2 1

Wiring Single-Line-Block Diagram Wiring Diagrams for wiring up systems To show the point-to-point wiring between components of an electrical system Include ID Numbers and color coding assigned to

2 Wiring Single-Line-Block Diagram Wiring Diagrams for wiring up systems To show the point-to-point wiring between components of an electrical system Include ID Numbers and color coding assigned to conductors in the ladder diagrams Shows coils, contacts, motors in the actual locations Prof. Paul Lin 3 Figure 2-16 Typical motor starter wiring diagram Wiring Diagrams for wiring up systems Prof. Paul Lin 4 2

3 Figure 2-17 Routing of wires in cables and conduits Conduit layout diagram: C1 - Conduit 1; C2 - Conduit 2 Prof. Paul Lin 5 Figure 2-18 Wiring with the internal connections of the magnetic starter omitted Prof. Paul Lin 6 3

4 Figure 2-19 Combination wiring and ladder diagram, Prof. Paul Lin 7 Figure 2-20 Single-line diagram of a motor installation Single line (one-line) diagram uses symbols to show all major components of an electric circuit Prof. Paul Lin 8 4

diagram represents the major functional parts of complex electrical/electronic

5 Figure 2-21 Single-line diagram of a power distribution system Prof. Paul Lin 9 Figure 2-22 Block Diagram of a variable frequency AC drives A block diagram represents the major functional parts of complex electrical/electronic system by blocks 3-phase 60Hz AC input The Rectifier block The Inverter block Prof. Paul Lin 10 5

elevators, material handling processes Features Wide range speed control (down

torque without stalling Dynamic breaking (for quick stopping, reducing size of

6 Motor Classification Prof. Paul Lin 11 DC Motor Connections DC Motor Applications: cranes, conveyors, elevators, material handling processes Features Wide range speed control (down to almost zero), acceleration, reverse operation Can supply over 5-times rated torque without stalling Dynamic breaking (for quick stopping, reducing size of mechanical brake) DC-motor generated energy is fed to a resistor grid, or Regenerative braking (DC motor generated energy) Prof. Paul Lin 12 6

7 DC Motor Connections Figure 2-24 DC motor used on crane Prof. Paul Lin 13 Figure 2-25 Parts of a DC compound motor Prof. Paul Lin 14 7

8 Figure 2-26 Standard DC shunt motor connections for counter-clockwise and clockwise rotation Prof. Paul Lin 15 Figure 2-27 Standard DC series motor connections for counter-clockwise and clockwise rotation Prof. Paul Lin 16 8

9 Figure 2-28 Standard DC compount motor connections for counter-clockwise and clockwise rotation Prof. Paul Lin 17 AC Motor Connections Single-phase motor connections Three-phase motor connections Dual-voltage motor connections Multispeed motor connections Prof. Paul Lin 18 9

10 Figure 2-29 Three-phase squirrel-cage AC induction motor Prof. Paul Lin 19 Baldor Motor Manufacturing Plants ABB Robotics Electric Motor Manufacturing at Baldor, 3 to 15 HP, (ABB), Nov. 18, 2013, 6 min, Baldor Fort Smith, Arkansas Motor Plant, 6: 67 min, Prof. Paul Lin 20 10

11 Figure 2-30 AC split-phase induction motor Prof. Paul Lin 21 Figure 2-31 Dual-voltage split-phase motor stator connection Prof. Paul Lin 22 11

12 Figure 2-32 Permanent-split capacitor motor Prof. Paul Lin 23 Figure 2-33 Three-phase wye and delta motor connection Prof. Paul Lin 24 12

13 Figure 2-34 Dual voltage three-phase wye connection Prof. Paul Lin 25 Multi-Speed Motor Motor Speed: Stator Field Speed = 120 x Frequency/Number of Poles, N = 120 * f/p Rotor shaft speed: Nr = N* (1 slip); slip ranged from 0.03 to 0.05 Speed change methods N = 120*f/P => change the number of poles 2, 4, 6, 8 N = 120*f/P => change the frequency from the power source Prof. Paul Lin 26 13

14 Figure 2-35 Constant horse-power two-speed, three phase motor and controller Prof. Paul Lin 27 Figure 2-36 Reversing the direction of rotation of a three phase motor Interchange of any two power leads Prof. Paul Lin 28 14

Figure 2-36 Reversing phase relay circuit Monitor the correct phase rotation sequence A solid-state sensing circuit => Relay energized => NO contact closed (if

15 Figure 2-36 Reversing phase relay circuit Monitor the correct phase rotation sequence A solid-state sensing circuit => Relay energized => NO contact closed (if correct phase sequence) Relay energized => NO contact closed (if correct phase sequence) Prof. Paul Lin 29 Summary & Conclusion Questions? Prof. Paul Lin 30 15

ECET 211 Electric Machines & Controls Lecture 2-3 (Part 3 of 3) Symbols and Drawing for Electric Motor Control Systems

ECET 211 Electric Machines & Controls Lecture 2-3 (Part 3 of 3) Symbols and Drawing for Electric Motor Control Systems Text Book: Chapter 2. Understanding Electrical Drawings, Electric Motors and Control