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Mechatronic Automation

Pneumatic Circuit Design

Dr. Lei Cui

Department of Mechanical Engineering

Curtin University

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Circuit Layout

ISO 1219-2: the standard for circuit diagrams

Minimum crossing lines

A4 format or A3 folded to A4 height

To be on several sheets if necessary with line

identification code

Limit valves position of operation by actuatorsshown by a marker with reference code tosymbol

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Circuit Layout

All actuators at the top of the page in order ofsequential operation

Other components in sequential order from thebottom up and from left to right

Draw cylinders and directional valveshorizontally

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Circuit Layout

Show elements in the initial position of control

Draw pipelines straight without cross-overwherever possible

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Documentation

Step diagram

Circuit diagram

Description of theoperation of the system

Technical data on thecomponents

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Structure of Pneumatic Systems

Signal flow From bottom to top

Signal flow S P A principle: Sensor, processor, actuator

I P A principle: input, processing, output

Energy supply Through tubing or piping

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Structure of Pneumatic Systems

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Structure of Pneumatic Systems

Supply elements

Input elements

Processing elements

Control elements

Working element

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System Circuit Diagram

Identification code for components System number beginning with 1

Circuit number beginning with 1

All accessories with 0

Component identification by number

Component number beginning with 1

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System Circuit Diagram

Identification code for components Component designation by letters

Working elements: A

Compressors: P Sensors: S

Valves: V

Others: Z

Component number

Beginning from 1

Number assigned from left to right, from bottom from top

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System Circuit Diagram

0Z, 0S

1S1, 1S2, 1S3

1V1

1V2

1A

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System Circuit Diagram

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Control of Single Cylinder

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Control of Single Cylinder

Direct control of a single-acting cylinder Piston extends when button held down

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Indirect control of a single-acting cylinder

Control of Single Cylinder

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Indirect control of a single-acting cylinder

Instroke speed control

Control of Single Cylinder

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Indirect control of a single-acting cylinder

Outstroke and Instroke speed control

Control of Single Cylinder

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Indirect control of a single-acting cylinder Automatic control

Control of Single Cylinder

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Control of Single Cylinder

Indirect control of a single-acting cylinder Draw the complete circuit (with energy supply) and

identify the five levels of pneumatic structure of the

circuit

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References

Pneumatic Handbook, Trade & Technical Press

Ltd.

Andrew Parr, Hydraulics and Pneumatics ATechnicansand Engineers Guide, Butterworth

Heinemann

Peter Croser and Frank Ebel, Pneumatics

Basic Level, Feso