iacs-supplement notes on pneumatic electropneumatic

8/8/2019 IACS-Supplement Notes on Pneumatic Electropneumatic

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Electrical & Electronics Engineering, UTPCourse Instructor: Dr Nordin Saad11-- 11

EAB4223/EEB 5223EAB4223/EEB 5223--Supplements notesSupplements notes

on Pneumatic & Electroon Pneumatic & Electro--pneumaticspneumatics

Contents:

Introduction to pneumatic &electro-pneumatic systems

Designing pneumatic and electro-pneumatic circuits

Assoc. Prof. Dr Nordin Saad

Department of Electrical & Electronics Engineering

Universiti Teknologi PETRONAS

Email: [email protected]

Tel: 05-368 7835

Therelevant

slidesare

1-1-1-6,and

1-16-1-18.


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Designing Pneumatic & ElectroDesigning Pneumatic & Electro--pneumatic circuitspneumatic circuits

Objectives:Objectives:

1. Familiarize with the terms, symbols of pneumatic andelectro-pneumatic components.

2. Design and build pneumatic and electro-pneumaticcircuits.

3. Use simulation software (Automation Studio, PneusimPro).


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Pneumatic circuitsPneumatic circuits

Directional valves

Valves are named (represented) according to

number of ports

number of control positions

2/2 way NC valve

2/2 way NO valve

3/2 way NC valve


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Directional valves actuations

Valves may be actuated by

manual actuation

mechanical actuation

pressure (pneumatic) actuation

electronic (electrical or electronics relay actuation)**


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Pneumatic circuits examplesPneumatic circuits examples

3/2 way NC valve, PB actuated, spring returned

3/2 way NO valve, PB actuated, spring returned

5/2 way valve, pressure actuated, pressurereturned

3/2 way NC valve, roller actuated, spring returned

4/2 way valve, pressure actuated, spring returned

and e.t.c


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Using Combinational Logic similar to designing of electrical andelectronic circuits (digital logic).

COMBINATIONALCIRCUITS

Input

a

b

c

zOutput

The circuit is defined with the aid of a TRUTH Table.


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a b c z0 0 0 00 0 1 00 1 0 10 1 1 1

1 0 0 01 0 1 1

1 1 0 01 1 1 0

0 01 1

0 00 1

c c

a b

a b

a b

a b

a b

a b c

z = a b + a b c

Obtain switching functions for z, considering when the output =1.

Check for minimization using Algebra, or mapping technique.

EXAMPLE 1


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Realization of thepneumatic circuits.

3/2 NC valve

3/2 NO valve

OR logic(Shuttle valve)

5/2 NOvalve

a

b

c

a

a

b

c

a

a b a b

b

a b

a b

a b c

a b a b c

Double actingcylinder

Implement the

logics. E.g. 3/2 NOis analogy to NOTgate, shuttle valveis analogy to ORgate.


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Set: PB AND a-

Reset: a+

a- a+

Available, Three controlsignals, PB, a-, a+

The SET/RESET foractuator: PB

PB AND a-

Identify the controlsignals

Produce the Set/Reset

Implement the logic.


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Pneumatic circuits (example)Pneumatic circuits (example)Design another circuit that would operates similar to example 2.

The sequence will only start when TWO PB are pressed at the same time.

Given that the pneumatic circuit consists of the following components:

PB (x2),

a double acting cylinder,

3/2 way NC valve, pressure actuated, spring returned (x1), and

a 5/2 way valve, pressure actuated.

Assume that, initially the cylinder is in the retract position.

Produce t he required circuit. (next page)

EXAMPLE 3


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Set: PB1 AND PB2

Reset: spring returned.

Available, two controlsignals: PB1, PB2

The SET/RES ET for actuator:

PB1

PB1 AND PB2

PB2

Reset: spring

returned.


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ElectroElectro--pneumatic circuitspneumatic circuits

1. Input elements (electrical)-sensors: eg. Electrical Pushbutton (PB), proximity sensor, electrical limit switch.

2. Electrical processors: e.g. PLC, personal computer, relay,

etc.

3. Output elements (electrical)-actuators: electrical motor,stepper motor, servo motor, buzzer, lamp, LED.


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ElectroElectro--pneumatic circuits (example)pneumatic circuits (example)Modify example 3, using electrical control. The sequence will only start whenTWO PB are pressed at the same time.

Given that the pneumatic circuit consists of the following components:

PB (x2),

a double acting cylinder, anda 5/2 way valve, coiled actuated.


Produce the required circuit.

Direct control

Indirect control (i.e. via electronic relay)

EXAMPLE 4


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1 2

24V1

21

21

2

1

2

3

4

5

0V

PB1

PB2

Y1

Y1

1 2

24V1

21

21

2

1

2

3

4

5

0V

1

2

1

2

PB1

PB2

Y1

Y1

K1

K1

Direct Indirect


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ElectroElectro-- pneumatic circuits (example)pneumatic circuits (example)Modify example 2, using electrical control (instead of the pneumatic control)..

The solenoid is to be indirectly controlled via a coil. Given that the electro-pneumatic circuit consists of the following components:

PB (x1),

a double acting cylinder,3/2 way NC valve, roller actuated, spring returned (x2), and

a 5/2 way valve.

Note that: The TWO 3/2 way valves are used to detect the position of the cylinder,either retracted, or extended, coil, and relay.


EXAMPLE 5


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24V

0V

Y1

A- A+

PB1

A-

A+

K1

K1 K1

Y1

Pneumatic circuitElectro-pneumatic circuit

iacs-supplement notes on pneumatic electropneumatic

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