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WorkbookTP 201
With CD-ROM
Festo Didactic
541090 EN
ElectropneumaticsBasic Level
Elec
trop
neum
atic
s, B
asic
leve
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W
orkb
ook
TP 2
01
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IndiaFesto Controls Private Ltd.237B,Bommasandra Industrial Area,Bangalore Hosur Highway,Bangalore 560 099Tel. ++91 (0)80/22 89 41 00, Fax 783 20 58 E-mail: [email protected]
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1M1
1A1
1V1 24
351
1V2 1V31 1
2 2
1M1
1
S1
13
14
+24 V
0 V
K1
2
A1
A2
K1
1412
11
12
22
32
42
.214
24
34
44
11
21
31
41
Use for intended purpose
The training system from Festo Didactic has been developed and produced exclusively for training and
further education in the field of automation and technology. The respective training companies and/or
trainers must ensure that all trainees observe the safety precautions which are described in this workbook.
Festo Didactic hereby excludes any and all liability for damages suffered by trainees, the training company
and/or any third parties, which occur during use of the equipment in situations which serve any purpose
other than training and/or further education, unless such damages have been caused by Festo Didactic due
to malicious intent or gross negligence.
Order no. 541090
Status: 06/2009
Authors: M. Pany, S. Scharf
Editor: Frank Ebel
Graphics: Doris Schwarzenberger
Layout: 01/2010
© Festo Didactic GmbH & Co. KG, D-73770 Denkendorf, 2010
Internet: www.festo-didactic.com
e-mail: [email protected]
The reproduction, distribution and utilisation of this document, as well as the communication of its contents
to others without explicit authorisation, is prohibited. Offenders will be held liable for compensation of
damages. All rights reserved, in particular the right to file patent, utility model and registered design
applications. Portions of this documentation may be duplicated by an authorised user exclusively for
training purposes.
© Festo Didactic GmbH & Co. KG 541090 III
Table of Contents
Preface _________________________________________________________________________________ V
Introduction ____________________________________________________________________________ VII
Safety precautions and work instructions ____________________________________________________ VIII
Technology module for electro-pneumatics (TP200) ______________________________________________X
Learning objectives for the basic level (TP201) _________________________________________________ XI
Overview of learning objectives per exercise __________________________________________________ XII
Equipment set for the basic level (TP201) ____________________________________________________ XIII
Allocation of equipment per exercise _______________________________________________________ XVII
Practical tools for the trainer ______________________________________________________________ XVIII
Structure of the exercises ________________________________________________________________ XVIII
Designations of the components ___________________________________________________________ XVIII
CD ROM contents ________________________________________________________________________ XIX
Equipment set for the advanced level (TP202) _________________________________________________ XXI
Learning objectives for the advanced level (TP202) ____________________________________________ XXII
Solutions
Exercise 1: Inspecting beverage cases _________________________________________________________ 1
Exercise 2: Opening and closing a supply pipe ________________________________________________ 13
Exercise 3: Sealing plastic cans _____________________________________________________________ 23
Exercise 4: Packing plastic pellets___________________________________________________________ 33
Exercise 5: Diverting packages _____________________________________________________________ 41
Exercise 6: Pushing wooden boards out of a stacking magazine __________________________________ 51
Exercise 7: Sorting packages _______________________________________________________________ 61
Exercise 8: Sanding wooden boards _________________________________________________________ 69
Exercise 9: Diverting bottles _______________________________________________________________ 77
Exercise 10: Stamping taper keys ___________________________________________________________ 87
Exercise 11: Palletising roof tiles ___________________________________________________________ 99
Exercise12: Eliminating a malfunction at a pallet loading station _________________________________ 107
IV © Festo Didactic GmbH & Co. KG 541090
© Festo Didactic GmbH & Co. KG 541090 V
Preface
Festo Didactic’s training system for automation and technology is geared towards various educational
backgrounds and vocational requirements. The training packages are therefore broken down as follows:
Basic modules impart basic, interdisciplinary, technological knowledge.
Technology modules address the important topics of open and closed-loop control technology.
Function modules explain the fundamental functions of automated systems.
Application modules enable training and further education that is aligned to real-life practice.
The technology modules deal with various technologies including pneumatics, electro-pneumatics,
programmable logic controllers, automation using a personal computer, hydraulics, electro-hydraulics,
proportional hydraulics and applications technology (handling).
The modular design of the training system makes it possible to focus on applications above and beyond
those covered in the individual modules, such as, for example, PLC actuation of pneumatic, hydraulic and
electric drives.
VI © Festo Didactic GmbH & Co. KG 540671
All training modules have the same structure:
• Hardware
• Courseware
• Software
• Seminars
The hardware is comprised of industrial components and systems that are specially designed for training
purposes.
The structure of the courseware corresponds to that of the training hardware. It includes:
• Textbooks (with exercises and examples)
• Workbooks (with practical exercises, supplementary instructions and solutions)
• Transparencies and videos (for dynamic instruction)
The working materials for TP201 consist of 19 exercises and a workbook. Each exercise has its own set of
ready-to-use worksheets. The solutions are included in the workbook, which also has the worksheets and a CD
ROM. The exercises can be purchased without the workbook and are used as consumables. They can thus be
easily made available to trainees. Data sheets for the hardware components are made available along with the
training module and on the CD ROM.
The teaching and learning media are available in several languages. They’re intended for use in classroom
instruction, but are also suitable for self-study.
Where software is concerned, computer training programs and programming software are made available
for programmable logic controllers.
A wide range of seminars covering the contents of the technology module round off the programme for
training and further education.
© Festo Didactic GmbH & Co. KG 541090 VII
Introduction
This workbook is part of the training system for automation and technology from Festo Didactic GmbH & Co.
KG. The system provides a solid basis for practical training and further education. The TP200 technology
module only includes electro-pneumatic control systems.
The TP201 basic level is suitable for basic training in the field of electro-pneumatic control technology. It
covers the fundamentals of electro-pneumatics as well as the function and use of electro-pneumatic
equipment. Simple electro-pneumatic control systems can be set up with the equipment set.
The TP202 advanced level is targeted at vocational training in the field of electro-pneumatic control
technology. The two equipment sets can be used to set up extensive combinatory circuits with linking of the
input and output signals, as well as programme control systems.
A permanent workstation equipped with a Festo Didactic profile plate is a prerequisite for setting up the
control systems. The profile plate has 14 parallel T-slots at 50 mm intervals. A power supply with short-
circuit protection is used as a direct voltage source (input: 230 V, 50 Hz, output: 24 V, max. 5 A). A portable
compressor with silencer (230 V, max. 8 bar = 800 kPa) can be used for compressed air supply.
Working pressure should not exceed 6 bar (600 kPa).
Ideal reliability can be achieved by operating the control system at a working pressure of 5 bar (500 kPa)
without oil.
All the control systems for the 12 exercises are set up using the equipment set for the TP201 basic level. The
theoretical fundamentals for understanding this collection of exercises are included in the textbook:
• Electro-pneumatics
Data sheets for the individual components are also available (cylinders, valves, measuring instruments etc.).
VIII © Festo Didactic GmbH & Co. KG 540671
Safety precautions and work instructions
General
Trainees should only work with the control systems under the supervision of a trainer.
Observe specifications included in the data sheets for the individual components and in particular all safety
instructions!
Mechanical
• Mount all of the components securely onto the profile plate.
• Limit switches may not be actuated frontally.
• Danger of injury during troubleshooting!
• Use a tool to actuate the limit switches, for example a screwdriver.
• Only reach into the set-up when it’s at a complete standstill.
Electrical
• Electrical connections must only be established and interrupted in the absence of voltage!
• Use connector cables with safety plugs only for electrical connections.
• Use low-voltage only (max. 24 V DC).
Pneumatics
• Do not exceed the maximum permissible pressure of 6 bar (600 kPa).
• Do not switch on the compressed air until all the tubing connections have been completed and secured.
• Do not disconnect tubing while under pressure.
• Danger of injury when switching compressed air on!
Cylinders may advance and retract automatically.
• Danger of accident due to tubing slipping off!
Use shortest possible tubing connections.
Wear safety glasses.
In the event that tubing slips off:
Switch compressed air supply off immediately.
• Pneumatic circuit set-up:
Connect the components using plastic tubing with an outside diameter of 4 or 6 mm. Push the tubing
into the push-in connector as far as it will go.
Switch compressed air supply off before dismantling the circuit.
• Dismantling pneumatic circuits:
Press the blue release ring down, after which the tubing can be pulled out.
© Festo Didactic GmbH & Co. KG 540671 IX
The mounting boards for the components are equipped with mounting variants A through D:
Variant A, snap-in system
Lightweight components that are not load-bearing (e.g. directional control valves). Simply clip the component
into the slot on the profile plate. Release the component from the slot by actuating the blue lever.
Variant B, bolt system
Components with medium load capacity (e.g. drives). These components are clamped to the profile plate
using T-head bolts. The blue, knurled nut is used for clamping and loosening.
Variant C, screw system
For components with high load capacity and components which are seldom removed from the profile plate
(for example on-off valve with filter regulator). These components are secured with socket head screws
and T-head bolts.
Variant D, plug-in system
Lightweight components with locking pins that are not load-bearing (e.g. indicators). These are secured
using plug adapters.
Observe specifications in the data sheets regarding the individual components.
X © Festo Didactic GmbH & Co. KG 540671
Technology module for electro-pneumatics (TP200)
The TP200 technology packet consists of a multitude of training materials and seminars. The subject matter
is entirely focused on electro-pneumatic control systems. Individual components included in the TP200
technology module can also be included in any of the other modules.
Important elements of the TP200:
• Permanent workstation with Festo Didactic profile plate
• Compressor (230 V, 0.55 kW, max. 8 bar = 800 kPa)
• Equipment sets or individual components
• Optional training materials
• Practical training models
• Complete laboratory set-ups
Training documentation
Textbooks TP201 basic level
Fundamentals of pneumatic control technology
Maintenance of pneumatic equipment and systems
Workbooks TP201 basic level
TP202 advanced level
Optional courseware Set of transparencies and overhead projector
Magnetic symbols, drawing template
Electro-pneumatics WBT, pneumatics WBT
Electrical engineering WBTs 1 and 2, electronics WBTs 1 and 2
Set of cutaway models with storage case
FluidSIM® pneumatic simulation software
Seminars
P100 Basic pneumatics knowledge for machine operators
P111 Fundamentals of pneumatics and electro-pneumatics
P121 Maintenance and troubleshooting for pneumatic and electro-pneumatic systems
P-OP Tracking down waste – economic use of pneumatics
P-NEU Pneumatics refresher and update
IW-PEP Repair and maintenance in the field of control technology – pneumatic and electro-pneumatic systems
P-AL Pneumatics for further education
P-AZUBI Pneumatics and electro-pneumatics for trainees
Please refer to the current seminar planner for locations, dates and prices.
You’ll find further training materials in our catalogue and on the Internet. The training system for automation
and technology is continuously updated and expanded. Transparencies, videos, CD ROMs and DVDs, as well
as textbooks, are offered in several languages.
© Festo Didactic GmbH & Co. KG 541090 XI
Learning objectives for the basic level (TP201)
• Become familiar with the set-up and mode of operation of a single-acting cylinder.
• Become familiar with the set-up and mode of operation of a double-acting cylinder.
• Be able to calculate piston forces based on specified values.
• Become familiar with the set-up and mode of operation of a 3/2-way solenoid valve.
• Become familiar with the set-up and mode of operation of a double solenoid valve.
• Be able to select solenoid valves based on the specified requirements.
• Be able to recognise and sketch the various types of actuation for directional control valves.
• Be able to convert solenoid valves.
• Be able to explain and set up direct actuation.
• Be able to explain and set up indirect actuation.
• Become familiar with logic operations and be able to set them up.
• Become familiar with various types of end-position control and learn to select the appropriate type.
• Be able to calculate characteristic electrical values.
• Become familiar with latching circuits with varying performance features.
• Be able to explain and set up an electrical latching circuit with dominant shutdown signal.
• Be able to set up a pressure-dependent control system.
• Become familiar with the set-up and mode of operation of magnetic proximity switches.
• Become familiar with displacement-step diagrams and learn to create them for specific problems.
• Be able to implement sequence control with two cylinders.
• Be able to detect and eliminate errors in simple electro-pneumatic control systems.
XII © Festo Didactic GmbH & Co. KG 541090
Overview of learning objectives per exercise
Exercise 1 2 3 4 5 6 7 8 9 10 11 12
Learning objectives
Become familiar with the set-up and mode of
operation of a single-acting cylinder. •
Become familiar with the set-up and mode of
operation of a double-acting cylinder. • • •
Learn to calculate piston forces based on specified
values. •
Become familiar with the set-up and mode of
operation of a 3/2-way valve. •
Become familiar with the set-up and mode of
operation of a double solenoid valve. • •
Be able to select solenoid valves based on the
specified requirements. •
Be able to recognise and sketch the various types of
actuation for directional control valves. •
Be able to convert solenoid valves. •
Be able to explain and set up direct actuation. • •
Be able to explain and set up indirect actuation. • • •
Become familiar with various types of end-position
control and learn to select the appropriate type. • •
Become familiar with logic operations and be able to
set them up. • •
Be able to calculate characteristic electrical values. •
Become familiar with latching circuits with varying
performance features. • •
Be able to explain and set up an electrical latching
circuit with dominant breaking signal. •
Be able to set up a pressure-dependent control
system. •
Become familiar with the set-up and mode of
operation of magnetic proximity switches. •
Become familiar with displacement-step diagrams and
learn to create them for specific problems. •
Be able to implement sequence control with two
cylinders. •
Be able to detect and eliminate errors in simple
electro-pneumatic control systems. •
© Festo Didactic GmbH & Co. KG 541090 XIII
Equipment set for the basic level (TP201)
The equipment set has been put together for basic training in the field of electro-pneumatic control
technology. It includes all the elements that are necessary for mastering the specific learning objectives and
can be supplemented with any other equipment sets. A profile plate, an electrical power supply unit and a
source of compressed air are also required in order to set up functional control systems.
Equipment set for the basic level (TP201)
Designation Order no. Quantity
2 x 3/2-way solenoid valve, normally closed 539776 1
5/2-way double solenoid valve 539778 2
5/2-way solenoid valve 539777 1
Blanking plug 153267 10
Double-acting cylinder 152888 2
One-way flow control valve 193967 4
Pressure sensor 539757 1
Single-acting cylinder 152887 1
On-off valve with filter regulator 540691 1
Limit switch, electrical, actuated from left 183322 1
Limit switch, electrical, actuated from right 183322 1
Plastic tubing, 4 x 0.75, 10 m 151496 2
Proximity switch, electronic 540695 2
Proximity switch, optical 178577 1
Relay, 3-way 162241 2
Signal input, electrical 162242 1
Push-in sleeve 153251 10
Push-in T-connector 153128 20
Distributor block 152896 1
XIV © Festo Didactic GmbH & Co. KG 541090
Equipment set symbols
Designation Symbol
Relay, 3-way
1412 2422 3432
32
4442
11 21 31 41
A1
A2
1412 2422 34 4442
11 21 41
A1
A231
1412 2422 3432 4442
11 21 31 41
A1
A2
Signal input, electrical
13 21
14 22
13 21
14 22
13 21
14 22
13 21
14 22
3/2-way solenoid valve,
normally closed
2
1M1
31
1M1
12
© Festo Didactic GmbH & Co. KG 541090 XV
Designation Symbol
5/2-way double solenoid
valve
5/2-way solenoid valve
Proximity switch, electronic
Pressure sensor
p
Proximity switch, optical
Electrical limit switch 42
1
One-way flow control valve 21
XVI © Festo Didactic GmbH & Co. KG 541090
Designation Symbol
Single-acting cylinder
Double-acting cylinder
On-off valve with filter
regulator
2
31
Distributor block
Connectors
© Festo Didactic GmbH & Co. KG 541090 XVII
Allocation of equipment per exercise
Exercise 1 2 3 4 5 6 7 8 9 10 11 12
Components
Cylinder, single-acting 1 1 1 1
Cylinder, double-acting 1 1 1 1 1 1 1 1 1 1
One-way flow control valve 1 2 2 1 2 2 2 2 2 2 3 3
3/2-way solenoid valve, normally closed 1 (1) 1 1
5/2-way solenoid valve 1 1 1 1
5/2-way double solenoid valve 1 1 1 1 1 1 1
Pressure sensor 1
Limit switch, electrical 1 2
Proximity switch, normally open 2 2 1 2
Proximity switch, optical 1 1
Pushbutton, electrical, normally open 1 1 1 2 2 1 1 1 1 1 1 1
Pushbutton, electrical, normally closed 1 1
Relay 1 1 2 2 3 1 3 3 3 3
Distributor block 1 1 1 1 1 1 1 1 1 1 1 1
On-off valve with filter regulator 1 1 1 1 1 1 1 1 1 1 1 1
Power supply unit, 24 V DC 1 1 1 1 1 1 1 1 1 1 1 1
5/2-way solenoid valve 1 1 1 1
XVIII © Festo Didactic GmbH & Co. KG 540671
Practical tools for the trainer
Learning objectives
The basic learning objectives for the exercises in this module are the systematic sketching of circuit
diagrams as well as the practical set-up of a control system on the profile plate. This direct interaction
involving both theory and practice ensures faster, long-term learning. Each exercise has its own individual
learning objectives; the specific learning objectives are documented in the matrix.
Required time
The time required for the exercises depends on the trainee’s previous knowledge of the subject matter. For
training a skilled labourer in metalworking or electrical installation: approx. 2 weeks. For training a
technician or engineer: approx. 1 week.
Equipment sets
The exercises and the equipment sets match each other. For all the exercises you’ll only need the
components included in the equipment set for the TP201 basic level.
Each exercise in the basic level can be set up on a profile plate.
Structure of the exercises
All 12 exercises in part A have the same structure and are broken down into:
• Title
• Learning objectives
• Presentation of the problem
• Layout
• Parameters
• Project assignment
• Worksheets
The solutions for all the 12 exercises are included in the trainer’s manual.
Designations of the components
Pneumatic components are designated in circuit diagrams to DIN ISO 1219 2. All the components included
in any given circuit have the same primary identifying number. Letters are assigned depending on each
respective type of component. Consecutive numbers are assigned if several components of the same type
are included within a single circuit. Pressure lines are designated with a P and are numbered separately.
Drives: 1A1, 2A1, 2A2 ...
Valves: 1V1, 1V2, 1V3, 2V1, 2V2, 3V1 ...
Sensors: 1B1, 1B2 ...
Signal input: 1S1, 1S2 ...
Accessories: 0Z1, 0Z2, 1Z1 ...
Pressure lines: P1, P2 ...
© Festo Didactic GmbH & Co. KG 541090 XIX
CD ROM contents
The CD ROM provides you with additional media. The contents of parts A (exercises) and C (solutions) have
been saved as PDF files.
The CD ROM has the following structure:
• Operating instructions
• Data sheets
• Demo
• Festo catalogue
• FluidSIM® circuit diagrams
• Industrial applications
• Presentations
• Product information
• Videos
Operating instructions
Operating instructions for various components included in the technology module are available. These
instructions are helpful when using and commissioning the equipment.
Data sheets
The data sheets for the components included in the technology module are available as PDF files.
Demo
A demo version of the FluidSIM® pneumatics software package is included on the CD ROM. Even this demo
version is suitable for testing control systems developed by the user.
Festo catalogue
The relevant pages from the Festo catalogue will be provided with selected components. The
representations and descriptions of the components are intended to demonstrate how the components are
presented in an industrial catalogue. Additional information regarding the components is also included.
FluidSIM® circuit diagrams
The FluidSIM® circuit diagrams for all 12 exercises included in the technology module are contained in this
directory.
Industrial applications
Photos and graphics representing industrial applications are made available. These can be used to illustrate
individual tasks. Project presentations can also be supplemented with these illustrations.
Presentations
Contains short presentations of the components included in the technology module. These can be used, for
example, to create project presentations.
XX © Festo Didactic GmbH & Co. KG 540671
Product information
This directory contains product information and data sheets from Festo AG & Co. KG for the components
included in this technology module. This is intended to demonstrate which information and data are
available for industrial components.
Videos
Several videos of industrial applications complete the media provided with the technology module. Short
clips demonstrate the applications in their actual industrial environments.
© Festo Didactic GmbH & Co. KG 541090 XXI
Equipment set for the advanced level (TP202)
The equipment set for the advanced level has been put together for vocational training in the field of electro-
pneumatic control technology. The two equipment sets (TP201 and TP202) include components that are
necessary for mastering the predefined learning objectives and can be supplemented as required with other
equipment sets from the training system for automation and technology.
Equipment set for the advanced level (TP202, order no. 540713)
Quantity Designation Order no.
2 Relay, 3-way 162241
1 Signal input, electrical 162242
1 Time relay, 2-way 162243
1 Preset counter, electrical 162355
1 Proximity switch, inductive 178574
1 Proximity switch, capacitive 178575
1 Emergency-stop button 183347
1 Valve terminal with 4 valve slices (MMJJ) 540696
2 Non-return valve, piloted 540715
XXII © Festo Didactic GmbH & Co. KG 540671
Learning objectives for the advanced level (TP202)
• Describe the structure and application of valve terminals
• Implement sequence controls with overlapping signals – solution according to group method
• Implement sequence controls with overlapping signals – solution with step sequence using spring
return valves
• Implement sequence controls with overlapping signals – solution with step sequence using double pilot
valve (with control step)
• Describe and set up modes of operation (single/continuous cycle)
• Describe the function and application of a preset counter
• Explain and implement the emergency stop function with spring return valves
• Implement special emergency stop conditions: actuators must come to a standstill during an emergency
stop
• Explain function and use of a 5/3-way solenoid valve
• Describe and set up the “Set” operating mode
• Execute troubleshooting in complex electro-pneumatic circuits
© Festo Didactic GmbH & Co. KG 541090 1
Exercise 1: Inspecting beverage cases
Learning objectives
After completing this exercise:
• You’ll be familiar with the set-up and mode of operation of a single-acting cylinder.
• You’ll be familiar with the set-up and mode of operation of a 3/2-way solenoid valve.
• You’ll be able to recognise and sketch the various types of actuation for directional control valves.
• You’ll be able to explain and set up direct actuation.
Presentation of the problem
Beverage cases are inspected for completeness with a test device. Incomplete cases are pushed off of the
roller conveyor by pressing a pushbutton. Develop a control system with which this process can be
executed.
Layout
Test device
Exercise 1: Inspecting beverage cases
2 © Festo Didactic GmbH & Co. KG 540671
Parameters
• A single-acting cylinder is to be used.
• The cylinder will be actuated using a pushbutton.
• In the event of a power failure, the cylinder’s piston rod should move to the retracted end position.
Control sequence
1 After pressing a pushbutton, the piston rod of a single-acting cylinder pushes the beverage case from
the conveyor.
2 When the pushbutton is released, the piston rod moves to its retracted end position.
Project assignment
1 Answer the questions and complete the tasks for the learning topics.
2 Draw the pneumatic and electrical circuit diagrams.
3 Create an equipment list.
4 Set up the pneumatic and electrical circuits.
5 Check the circuit sequence.
Exercise 1: Inspecting beverage cases
© Festo Didactic GmbH & Co. KG 541090 3
Function of pneumatic power components
Pneumatic power components can be subdivided into two groups:
• Power components with straight motion
• Power components with rotary motion
– Describe the power components shown below, as well as their functions.
Symbol Function
Single-acting cylinder, reset spring in piston chamber, return stroke by means of compressed air,
forward stroke by means of reset spring.
Function
The piston rod of this single-acting cylinder moves to its retracted end position by activating the
compressed air. After deactivating the compressed air, the piston moves to its advanced end
position by a reset spring in the piston chamber (2 operating positions).
Single-acting cylinder, reset spring in piston chamber, forward stroke by means of compressed air,
return stroke by means of reset spring.
Function
The piston rod of the single-acting cylinder moves to its advanced end position when the
compressed air has been activated. After deactivating the compressed air, the piston moves to its
retracted end position by a reset spring (2 operating positions).
Pneumatic quarter turn actuator (rotary drive) with limited swivel angle
Function
This swivel cylinder is double-acting and reverses by alternately activating the compressed air at
either end (2 operating positions).
Exercise 1: Inspecting beverage cases
4 © Festo Didactic GmbH & Co. KG 540671
Complete the symbols for solenoid valves
– Complete the individual symbols with the help of the descriptions of the respective components.
Description Symbol
Directly actuated 3/2-way solenoid valve, normally open,
with manual override, spring return
2
1M1
31
10
Pilot actuated 3/2-way solenoid valve, normally closed,
with manual override, spring return
2
1M1
31
12
Exercise 1: Inspecting beverage cases
© Festo Didactic GmbH & Co. KG 541090 5
Normal positions of directional control valves
An electrically actuated 3/2-way solenoid valve has two switching positions. It can be in the normal position
(unactuated) or the switched position (actuated). The valve can be either closed or open in its normal position.
The single-acting cylinder depicted below is controlled by an electrically actuated 3/2-way solenoid valve.
– Describe how the two different normal positions affect the motion sequence of the cylinder shown below:
3/2-way solenoid valve, normally closed 3/2-way solenoid valve, normally open
The solenoid valve used is reversed by applying voltage to the
solenoid coil; flow is enabled from supply port 1 to working port
2. After the signal has been stopped, the valve returns to its
normal position by a reset spring and supply port 1 is closed, thus
stopping flow. If the directional control valve’s solenoid coil is de-
energised, the cylinder chamber is vented via exhaust port 3 at
the directional control valve. The piston rod is retracted. When
the solenoid coil is energised, the directional control valve
switches and the cylinder chamber is pressurised. The piston rod
advances. When the solenoid coil is de-energised, the valve
switches back again. The cylinder chamber is exhausted and the
piston rod is retracted.
The motion sequence is thus as follows: 1A1+ 1A1-.
The solenoid valve used is reversed by applying voltage to the
solenoid coil; supply port 1 is closed, thus stopping flow. After
stopping the signal, the valve returns to its normal position by a
reset spring and flow from supply port 1 to working port 2 is
enabled. If the directional control valve’s solenoid coil is de-
energised, the cylinder chamber is pressurised via the directional
control valve. The piston rod is advanced. When the solenoid coil is
energised the directional control valve switches and the cylinder
chamber is exhausted via exhaust port 3 at the directional control
valve. The piston rod is retracted. When the solenoid coil is de-
energised, the valve switches back again. The cylinder chamber is
pressurised and the piston rod is advanced.
The motion sequence is thus as follows: 1A1- 1A1+.
Exercise 1: Inspecting beverage cases
6 © Festo Didactic GmbH & Co. KG 540671
Direct and indirect actuation
An electrically actuated solenoid valve can be directly or indirectly actuated.
– Describe the difference on the basis of the following example: electrical actuation of a 3/2-way solenoid
valve with spring return using a pushbutton.
Direct actuation Indirect actuation
When the pushbutton is activated, current flows through the
valve’s solenoid coil. The solenoid is energised and the valve
switches to the actuated position.
The flow of electrical current is interrupted when the pushbutton
is released. The solenoid is de-energised and the valve switches
to the normal position.
In the case of indirect actuation, current flows through a relay coil
when a pushbutton is activated. The relay’s contacts are closed
and the valve switches. The valve remains in this switching
position as long as electrical current flows through the solenoid
coil or the relay coil. The relay drops out when the flow of
electrical current through the relay coil is interrupted and the
valve switches to its normal position.
More complicated indirect actuation is used when the control
circuit and the primary circuit use different voltages, when current
flowing through the directional control valve’s solenoid coil is
greater than permissible current for the pushbutton, when
several valves are switched with a single pushbutton or pressure
switch or if extensive logic operations are required amongst the
signals from various pushbuttons.
Exercise 1: Inspecting beverage cases
© Festo Didactic GmbH & Co. KG 541090 7
Design and function of electrical switches
In principle, switches are subdivided into two types, namely pushbuttons and control switches and function
as NC contacts, NO contacts or change-over contacts.
– Describe the design and function of the switches depicted below.
Symbol Design / function
3
4
Design:
Pushbutton with normally open contacts
Function:
In the case of a pushbutton, the selected switching position is only retained as long as the pushbutton is
activated. The pushbutton shown here has a normally open function. With normally open contacts, the electrical
circuit is interrupted when the pushbutton is in its normal position, i.e. in the unactivated state. When the
control stem is actuated, the electrical circuit is closed and current flows to the consuming device. When the
control stem is released, the pushbutton is returned to its normal position by means of spring force and the
electrical circuit is interrupted.
Design:
Control switch with normally closed contacts
Function:
Control switches are mechanically locked into the two switching positions. The respective switching position is
retained until the switch is once again activated. The control switch shown here has a normally closed function.
In the case of normally closed contacts, the electrical circuit is closed when the control switch is held in its
normal position by means of spring force. When the control switch is activated, the electrical circuit is
interrupted and reactivation closes the circuit again.
42
1
Design:
Pushbutton with change-over contacts
Function:
In the case of a pushbutton, the selected switching position is only retained as long as the pushbutton is
activated. The pushbutton shown here has a change-over function. In the case of change-over contacts, NC and
NO functions are combined into a single component. An electrical circuit is closed and another is interrupted
with a single switching operation. Both circuits are briefly interrupted during switching.
Exercise 1: Inspecting beverage cases
8 © Festo Didactic GmbH & Co. KG 540671
Mode of operation of various valve types
Electrically actuated directional control valves are switched by means of solenoids. In principle, they can be
subdivided into two groups:
• Solenoid valves with spring return
• Double solenoid valves
– Explain the difference between the two groups with regard to function and performance in the event of a
power failure.
Valve type Mode of operation
Solenoid valve with spring
return
The actuated switching position is only retained as long as electrical current flows through the solenoid
coil. The normal position is clearly defined by the reset spring. If there is no electrical power, the valve
returns to its normal position by the spring. This may cause dangerous machine motion.
For example, the piston rod of a pneumatic cylinder could be returned to its normal position, thus
releasing a previously clamped workpiece.
Double solenoid valve Only a brief signal is required in order to reverse the valve and the last switching position is retained
even in the de-energised state as the result of static friction. All solenoid coils are de-energised in the
normal position and the normal position cannot be clearly defined. The valve stays in its last switching
position in the event of a power failure. No dangerous machine motion can be triggered as a result.
For example, the piston rod of a pneumatic cylinder is kept in its operating position and workpiece
clamping is thus retained.
Exercise 1: Inspecting beverage cases
© Festo Didactic GmbH & Co. KG 541090 9
Identifying valve ports
In order to prevent incorrect tubing connections at directional control valves, the valve ports (working and pilot
lines) are identified in accordance with ISO 5599-3 on the valves themselves, as well as in the circuit diagram.
– Explain the meanings and functions of the port designations listed below.
Port identification Meaning and function
3 Exhaust port
12 Pilot line, function for pilot actuated or pneumatically actuated directional control valves when
actuated: supply port 1 and working port 2 are connected
10 Pilot line, function for pilot actuated or pneumatically actuated directional control valves when
actuated: supply port 1 is closed
Exercise 1: Inspecting beverage cases
10 © Festo Didactic GmbH & Co. KG 540671
Complete the pneumatic and electrical circuit diagrams
– Complete the pneumatic and electrical circuit diagrams for the sorting system.
1V2
2
2
1
1M1
31
1A1
1V1
1M1
1
S1
13
14
+24 V
0 V
Pneumatic circuit diagram Electrical circuit diagram
Exercise 1: Inspecting beverage cases
© Festo Didactic GmbH & Co. KG 541090 11
Create an equipment list
In addition to the circuit diagram, complete project documentation also includes an equipment list.
– Create an equipment list by entering the required components in the table below.
Quantity Designation
1 Cylinder, single-acting
1 One-way flow control valve
1 3/2-way solenoid valve, normally closed
1 Pushbutton (normally open)
1 Distributor block
1 On-off valve with filter regulator
1 Compressed air source
1 Power supply unit, 24 V DC
Equipment list
Exercise 1: Inspecting beverage cases
12 © Festo Didactic GmbH & Co. KG 540671