Monday 22 February 2010

Electro Pneumatic circuit (1)


Electro pneumatic circuit (1)







In the given circuit diagram, answer the following questions:

Q1) Name the indicated parts in the pneumatic circuit
1-……………………………………
2-……………………………………
3-……………………………………
4-…………………………………..

Q2) what is the function of part no. 2
……………………………………………………………………………….
………………………………………………………………………………

Q3) Write down the type of the following switches:
S1 ……………………………………………...
S2 ………………………………………………
S3 ………………………………………………
S4 ……………………………………………..

Q4) Is the above circuit direct control or indirect control? Why?
………………………………………………………………
………………………………………………………………


Q5) How can the cylinder rod be extended?
………………………………………………………………………….
…………………………………………………………………………

Q6) How can the cylinder rod be retracted?
………………………………………………………………………….
…………………………………………………………………………

Q7) What is the name of the part which is labeled as Y1?
……………………………………………………….

Q8) How many relays are there in the circuit?
………………………………………………

Q9) What is the meaning of the symbols below circuit 1 and circuit 3?
……………………………………………………………………
……………………………………………………………………

Q10) Redraw the circuit using direct method






Part (2) Practical
a- Draw the circuit in the Fluidsim software
b- Connect the circuit in the pneumatic table

Good luck
Mr. Mohamed Abdel Aal

Indirect control


AND circuit - Direct control



Lesson Plan (M1)

Lesson Plan

Instructor Mohammed Abdel Aal
Instructional Practice Adopted
Learning Cycle Mid Term 1 – 2nd Semester
Cooperative Learning
Subject & Title Introduction to electro-pneumatics
Project Based Learning
Grade & Cluster G11 – Automation & Mechatronics
Lab. Based
Date 31-01-2010

Module/Textbook Module ( 1 )

Approximate time
Four 45-minute class periods (4*45=180 min)

Warm-up

Ask the students, did you see before the yogurt filling machine, and what are the main parts in this machine? Ask the students about the type of control in this machine? We can use some pictures and movies for this purpose

Introduction


G = What is the advantage of using electro pneumatic system
L = Has anyone seen how the bus driver open and close the door
O =By the end of this lesson, you will be able to:
· Identify different types of control and electrical switches
· Control of the pneumatic cylinders by using solenoid valves
S = We will work on the following distinct areas
- Identify the main types of electrical switches
- Differences between pushbutton and detent switches
- Different types of contact points
- Practical job indicating the control of the cylinders electrically
S = Safety in working with electro Pneumatics, make sure the desks and the chairs are setup correctly, and revise quickly the safety precautions in Pneumatics Lab.
S = As soon as you can control the cylinders by direct actuation, you will be
familiar about indirect controlling of the cylinders using relays

Lesson Objectives

In the end of this module the student will be able to:
1. Identify some types of linear actuators
2. Compare between different types of switches
3. Control of a lamp using different types of switches
4. Control of DAC using 5/2 way, single solenoid valve

Resources

List the materials and resources required for this lesson.

Textbook
Smart board
White Board
Module material
Power Point Presentation PPP
Cross sectional models
Projector
Fluid sim Software
Pneumatic Tables

Pre-requisites/Recap

Evoke prior learning by asking the students; what are the differences in using Pneumatic control and electro pneumatic control? And which is better?

Instructional Procedure

Obj. No.
Teacher’s role

Explain the contents of module 1 step by step and give a basic understanding using many teaching techniques like oral questions, discussing the different point of views, white and smart boards, PPP and magnetic symbols
And cross sectional models
- check the students understanding step by step and motivate the students for new ideas


student's role
Worming up and interaction
Answer the questions in the presentation
Listening and Watching the pictures and movies
Answer the questions in the module
Interaction in the class
All students should carrying out the practical job

5.1
Revision
Quick revision on the main parts of Pneumatic system, and the function of each item
Answer the oral questions and discuss the different point of views

5.2
Types of switches
- Pushbutton switches
- Detent switches
Answer the oral questions and discuss the different point of views

5.3
Some types of contact points
- N/O contact
- N/C contact
Draw the ISO symbols of N/O pushbutton switch and see the pictures on p 9 module 1
5.4
Types of Control
- Direct control
- Indirect control
Draw the ISO symbol of relay
5.5
Some Types of electrical switches
- Limit switch
- Pushbutton switch
In groups, students should collaboratively answer work sheets page 17 and 18, module 1
5.6
Fluid sim Software
Draw the two circuits on page 18 in module 1, and check your connections and make the simulation
In groups, the students draw the pneumatic circuit on p18 on the fluid sim software and simulate the circuit
5.7
Practical Jobs
Carrying out the same jobs on the pneumatics tables
In groups, the students carrying out the same pneumatic circuit on the pneumatic tables and operate the cylinders
5.8
Quiz
Small quiz covering this lesson
Solve the given quiz

Assessment

Students will verbally answer the questions during the whole lesson and share and discuss the other ideas
Students will draw by themselves electro pneumatic circuit on the fluid sim software
Students will be able to carry out the practical jobs and give them assistance when needed.
Give a small quiz at the end of the lesson


Homework

Draw the different types of electrical switches


Participation Criteria

Actively participation on the oral questions and constructive questions as well
Correct using of the software and pneumatic components


Lesson Closure

Conclusion
O = I hope that all of you now able to identify all types of switches
F = Good work, all been successful
F = in our next session, we are going to learn about relays



Class work (2)

Class work (2) Student name:
Section:

Q1) what are the two types of control


Q2) Draw the ISO symbol of a single acting cylinder


Q3) Draw the ISO symbol of a double acting cylinder



Q4) List two advantages of direct control


Q5) Draw the ISO symbol of one way flow control valve



Q6) List two advantages of indirect control



Q7) Draw the ISO symbol of 5/2 single solenoid valve




Q8) Draw the ISO symbol of 5/2 double solenoid valve




Q9) Draw the ISO symbol of electrical relay



Instructions for practical jobs

Instructions for practical jobs

1. Drawing the electro pneumatic circuit diagram

2. Check your answer using fluid sim software

3. Mount the components on the board

4. Connect the components pneumatically and electrically

5. Switch on air supply and dc power supply

6. Operate the circuit

7. Switch off air supply and dc power supply

8. Dismantle and tidy up


(NB) Do not forget to follow all the safety precautions

Energizer

Energizer
Colours game
Instructions
1- Do not read the word; say what’s the colour of the word



GreenYellow – Blue – Red – Green – Black – White – Green – Blue – WhiteRedRed – Black – Green- Red - BlackBlue – Green – White – Red – Blue - Green - Blue -

Safety in Mechatronic Lab.

Safety in Mechatronics lab.

1- Securely plug in pneumatic devices

2- Keep piston rod travel free

3- Check all connections before connecting the compressed air

4- Do not exceed the maximum pressure

5- Check working pressure

6- Be careful from the recoil risk

7- Do not completely unscrew the regulating screw

8- Tighten each locknut after setting the regulating screw

9- Never tighten the regulating screw with force

10- Never operate roller by hands

11- Connect the compressed air supply only when you complete all connections

12- Close off the compressed air supply before dismantle

13- Follow your teacher’s instructions for individual exercise

14- Tidy up all the components after finishing
15- Be careful from the electric supply
16- Connect the wires correctly according to the circuit to avoid the short circuits
17- Switch on the power supply after finishing all the connections
18- Switch off the power supply before dismantling the wires
19- Wear your safety glasses

Sunday 21 February 2010

Class work 2

Class work Student name
Module (2) Class

Q1) What are the two types of energy used in electro-pneumatics



Q2) What is the difference between 5/2 single solenoid and 5/2 double solenoid






Q3) Explain the difference between direct and indirect control





Q4) what is the relay




Q5) What is the function of the relay




Q6) List two advantages of direct control



Q7) List two advantages of indirect control




Q8) List two disadvantages of direct control



Q9) List two disadvantages of indirect control











Q10) Draw the ISO symbols for the following components
a- Single acting cylinder



b- Double acting cylinder


c- Air service unit


d- Air supply / Pressure source


e- Air tank


f- One way flow control valve



g- 3/2 way (N/C), single solenoid valve


h- 5/2 way , single solenoid valve



i- 5/2 way, double solenoid valve



j- Solenoid / Coil


k- N/O pushbutton switch


l- N/C pushbutton switch


m- Relay


n- Limit switch








Q11) Draw an electro-pneumatic circuit under the following condition
A double acting cylinder advance when two pushbutton switches are pressed together and the cylinder will retract if any one of the pushbutton switches is released (use direct control)





















Q12) Draw an electro-pneumatic circuit under the following condition
A double acting cylinder advance when a pushbutton switch S1 is pressed and the cylinder will retract if another pushbutton switch S2 is pressed (use indirect control)


Class work 1

Class work 1 Student name:
Module (1) Class

Q1) Define (what is) the Electo-Pneumatics



Q2) List three applications of electro-pneumatics


Q3) State three advantages of electro-pneumatics




Q4) Give two examples of signal processing in electro-pneumatics





Q5) Give two examples of signal input in electro-pneumatics




Q6) Give two examples of signal output in electro-pneumatics




Q7) Give two examples of command execution in electro-pneumatics




Q8) List four electro-pneumatic components





Q9) What are the two types of electric current




Q10) Draw the two types of electric current AC and DC







Q11) What is the function of the DC power supply



Q12) what are the three components which consist the DC power supply







Q13) List three types of switches



Q14) what is the difference between control (detent) switch and pushbutton switch



Q15) what is the difference between N/O pushbutton switch and N/C pushbutton switch





Q16) what are the types of contacts in pushbutton switches





Q17) What is the function switches



Q18) What is the function of the limit switch



Q19) which part in pneumatic system is similar to the electrical limit switch



Q20) what is the relay


Q21) List two advantages of relays






Answer key classwork 1

Class work 1 Student name:
Module (1) Class

Q1) Define (what is) the Electo-Pneumatics

It is the use of electrical signals to control pneumatic systems

Q2) List three applications of electro-pneumatics
• Filling
• Packaging
• Handling of work pieces
• Stamping
• Metal forming
• Automation processes

Q3) State three advantages of electro-pneumatics

• Cheap
• Greater reliability
• Easy handling
• Simple installation
• Easily modified and adapted
• Secure mounting


Q4) Give two examples of signal processing in electro-pneumatics

Relays
Contactor
PLC

Q5) Give two examples of signal input in electro-pneumatics

Pushbutton switches
Limit switches
Sensors

Q6) Give two examples of signal output in electro-pneumatics

5/2 single solenoid valve
5/2 double solenoid valve

Q7) Give two examples of command execution in electro-pneumatics

Cylinders
Motors
Optical display

Q8) List four electro-pneumatic components

DC power supply
Switches
Relays
Sensors
Solenoid valves
DC power supply
Switches
Relays
Sensors
Solenoid valves

Q9) What are the two types of electric current

Direct current DC
Alternating current AC


Q10) What is the function of the DC power supply

It is used to convert the 230 V AC into 24 V DC

Q11) what are the three components which consist the DC power supply

1- Transformer used to reduce the voltage from 230 V to 24 V
2- Rectifier used to convert the current from AC into DC
3- Stabilizer used to smooth and maintain constant voltage at the output

Q12) List three types of switches
1- Pushbutton switches
2- Control (Detent) switches
3- Limit switches

Q13) what is the difference between control (detent) switch and pushbutton switch

If you release the switch
The pushbutton will return back to the normal position
The detent will remain in the last position

Q14) what is the difference between N/O pushbutton switch and N/C pushbutton switch

N/O pushbutton switch is used to connect the current
N/C pushbutton switch is used to interrupt (cut) the current

Q15) what are the types of contacts in pushbutton switches

1- N/O switches
2- N/C switches
3- Changeover switches

Q16) What is the function switches

They are used to connect and interrupt the electric current

Q17) What is the function of the limit switch

It is used for automatic operation

Q18) which part in pneumatic system is similar to the electrical limit switch

3/2 way valve, roller lever operated

Q19) what is the relay

It is an electromagnetic switch and it has a coil and some contact points

Q20) List two advantages of relays

1- it can be used to switch one or more contacts
2- it is used to switch a high current with a low current circuit



module 2

Control in Electro-Pneumatics

Types of control
Direct control without using relays or PLC
Indirect control by using relays

Advantages of direct control
1- simple and easy
2- cheap

Disadvantages of direct control
1- remote control is not possible
2- switching more than one valve at a time is not possible
3- Latching is not possible
4- Some design is not possible

Difference between 5/2 single pilot and 5/2 double pilot
When the electric signal is cut
5/2 single pilot return to the initial position
5/2 double pilot keep and store the last position (like a detent)

module 1

Electro-Pneumatics

Definition
It is the use of Electrical signals to control Pneumatic systems

Applications of Electro-Pneumatics
• Filling
• Packaging
• Handling of work pieces
• Stamping
• Metal forming
• Automation processes
• Modern industries

Advantages of Electro-Pneumatics
• Cheap
• Greater reliability
• Easy handling
• Simple installation
• Easily modified and adapted
• Secure mounting
• Environmentally friendly


Examples of signal input in electro-pneumatic systems
Pushbutton switches
Limit switches
Sensors

Examples of signal processing in electro-pneumatic systems
Relays
Contactor
PLC

Examples of signal output in electro-pneumatic systems
5/2 single solenoid valve
5/2 double solenoid valve


Examples of command execution in electro-pneumatic systems
Cylinders
Motors
Optical display

Electro-Pneumatic components
DC power supply
Switches
Relays
Sensors
Solenoid valves

Types of electric current
Direct current DC
Alternating current AC

Power supply
It is used to convert the 230 V AC into 24 V DC

Main component of the power supply
1- Transformer used to reduce the voltage from 230 V to 24 V
2- Rectifier used to convert the current from AC into DC
3- Stabilizer used to smooth and maintain constant voltage at the output


Switches
They are used to connect and interrupt the electric current

Types of switches
1- Pushbutton switches
2- Control (Detent) switches
3- Limit switches

Types of contact points (switches)
1- N/O switches
2- N/C switches
3- Changeover switches


Relay
It is an electromagnetic switch and it has a coil and some contact points

Advantages of the relays
1- it can be used to switch one or more contacts
2- it is used to switch a high current with a low current circuit