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3442 Industrial Instruments 2 Chapter 10 Analog Controllers Dr. Bassam Kahhaleh Princess Sumaya Univ. Electronic Engineering Dept.

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Presentation on theme: "3442 Industrial Instruments 2 Chapter 10 Analog Controllers Dr. Bassam Kahhaleh Princess Sumaya Univ. Electronic Engineering Dept."— Presentation transcript:

1 3442 Industrial Instruments 2 Chapter 10 Analog Controllers Dr. Bassam Kahhaleh Princess Sumaya Univ. Electronic Engineering Dept.

2 Princess Sumaya University Industrial Instruments 22 / 27 10: Analog Controllers Electronic Controllers  Error Detector  Voltage difference.

3 Princess Sumaya University Industrial Instruments 23 / 27 10: Analog Controllers Electronic Controllers  Error Detector  Voltage difference.  Floating Power Supply.

4 Princess Sumaya University Industrial Instruments 24 / 27 10: Analog Controllers Electronic Controllers  Error Detector  Voltage difference.  Floating Power Supply.

5 Princess Sumaya University Industrial Instruments 25 / 27 10: Analog Controllers Electronic Controllers  Single Mode (Proportional, Integral … etc) Two-Position (ON / OFF) Two-Position (ON / OFF)

6 Princess Sumaya University Industrial Instruments 26 / 27 10: Analog Controllers Electronic Controllers  Single Mode (Proportional, Integral …) Two-Position (ON / OFF) Two-Position (ON / OFF)

7 Princess Sumaya University Industrial Instruments 27 / 27 10: Analog Controllers Electronic Controllers  Single Mode (Proportional, Integral …) Two-Position (ON / OFF) Two-Position (ON / OFF)

8 Princess Sumaya University Industrial Instruments 28 / 27 10: Analog Controllers Electronic Controllers  Single Mode (Proportional, Integral …) Two-Position (ON / OFF) Two-Position (ON / OFF) 0 0 V SP V in > V SP 0 + -

9 Princess Sumaya University Industrial Instruments 29 / 27 10: Analog Controllers Electronic Controllers  Single Mode (Proportional, Integral …) Two-Position (ON / OFF) Two-Position (ON / OFF) +V O 0 V SP – [ V in + (R 1 /R 2 )V O ] V O + - V in + ( R 1 /R 2 ) V O < V SP V in < V SP – (R1/R2)V O

10 Princess Sumaya University Industrial Instruments 210 / 27 10: Analog Controllers Electronic Controllers  Single Mode Example (On / Off): Level measurement in a tank: Transducer output 0.2 V / m Turn-on pump when level > 2 m Turn-off pump when level < 1.5 m Pump turn-on voltage = 5 V V H = 0.4 V V L = 0.3 V V SP = 0.4 V R 1 / R 2 = 0.02 V O = 5 V

11 Princess Sumaya University Industrial Instruments 211 / 27 10: Analog Controllers Electronic Controllers  Single Mode (Proportional, Integral …) Three-Position Three-Position

12 Princess Sumaya University Industrial Instruments 212 / 27 10: Analog Controllers Electronic Controllers  Single Mode Example (3-Position): Level control in a tank: Transducer output 0.45 V / m Valve opening: 0 to 8 V level < 2 m:valve = 20% open 2 m < level < 3 mvalve = 65% open 3 m < levelvalve = 100% open Comparator output voltage = 5 V V SP1 = 0.9 V V SP2 = 1.35 V V B = 1.6 V R 3 / R 1 = 0.72 V Out = 1.6 V V Out = 5.2 V R 3 / R 2 = 0.56

13 Princess Sumaya University Industrial Instruments 213 / 27 10: Analog Controllers Electronic Controllers  Single Mode (Proportional, Integral …) Floating Floating

14 Princess Sumaya University Industrial Instruments 214 / 27 10: Analog Controllers Electronic Controllers  Single Mode Example (Floating): Trip Voltages: 2 & 4 V 3-Position Controller O/P: 0, ± 2 V Integrator: 1 MΩ, 1 μF  = 1 sec

15 Princess Sumaya University Industrial Instruments 215 / 27 10: Analog Controllers Electronic Controllers  Single Mode Example (Floating): Assume an inverter is used at the output of the integrator: 2 V -2 V

16 Princess Sumaya University Industrial Instruments 216 / 27 10: Analog Controllers Electronic Controllers  Single Mode (Proportional, Integral …) Proportional Proportional

17 Princess Sumaya University Industrial Instruments 217 / 27 10: Analog Controllers Electronic Controllers  Single Mode Example (Proportional): O/P Scaling: 0 – 10 V  0 – 100 % Zero error controller O/P: 50 % Proportional Band: 20 % Error Range: 10 V V O = 5 V PB = 100 / K P K P = 100 / 20 = 5 G P = 5

18 Princess Sumaya University Industrial Instruments 218 / 27 10: Analog Controllers Electronic Controllers  Single Mode (Proportional, Integral …) Integral Integral 1/RC

19 Princess Sumaya University Industrial Instruments 219 / 27 10: Analog Controllers Electronic Controllers  Single Mode Example (Integral): Measurement range: 0.4 – 2 V Output range: 0 – 6.8 V K I = 4% / (%-min) RC = 3.53 sec

20 Princess Sumaya University Industrial Instruments 220 / 27 10: Analog Controllers Electronic Controllers  Single Mode (Proportional, Integral …) Derivative Derivative R2CR2CR2CR2C  << 1/R 1 C R 1 << 1/  C

21 Princess Sumaya University Industrial Instruments 221 / 27 10: Analog Controllers Electronic Controllers  Single Mode Example (Derivative): Valve Control Flow surge: minimum period 2.2 sec Input signal range:0.4 – 2 V Output range:0.0 – 5 V K D = 0.04% / (%/min) R 2 C = 7.5 sec f max = 0.45 Hz  max = r/s  o = 28.3 r/s R 1 C = 1/28.3

22 Princess Sumaya University Industrial Instruments 222 / 27 10: Analog Controllers Electronic Controllers  Composite Modes Proportional-Integral ( PI ) Proportional-Integral ( PI ) R 2 /R 1 1/R 2 C

23 Princess Sumaya University Industrial Instruments 223 / 27 10: Analog Controllers Electronic Controllers  Composite Mode Example ( PI ): Input signal range:0.4 – 2 V Output range:0.0 – 10 V PB = 30 % K I = 0.1% / (% - sec) K P = 100 % / 30 % R 2 C = 1.6 sec R 2 /R 1 = 20.83

24 Princess Sumaya University Industrial Instruments 224 / 27 10: Analog Controllers Electronic Controllers  Composite Modes Proportional-Derivative ( PD ) Proportional-Derivative ( PD ) R 2 /(R 1 +R 3 ) R3CR3CR3CR3C R 1 //R 3 << X C

25 Princess Sumaya University Industrial Instruments 225 / 27 10: Analog Controllers Electronic Controllers  Composite Mode Example (PD): Input signal range:0.4 – 2 V Output range:0.0 – 5 V K P = 5 % / % K D = 0.08% / (%/min) Minimum period: 1.5 sec R 3 C = 15 sec f max = 0.67 Hz  max = r/s  o = 41.9 r/s (R 1 //R 3 )C = 1/41.9 R 2 /(R 1 +R 3 )=

26 Princess Sumaya University Industrial Instruments 226 / 27 10: Analog Controllers Electronic Controllers  Composite Modes Proportional-Integral-Derivative ( PID ) Proportional-Integral-Derivative ( PID )

27 Princess Sumaya University Industrial Instruments 227 / 27 10: Analog Controllers End of Chapter 10


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