1. Industrial Electronics
DAE 32003
Industrial Electronics
Jabatan Kejuruteraan Elektrik, PPD

2. HYDRAULIC AND PNEUMATIC CONTROL SYSTEM
CHAPTER 7
HYDRAULIC AND PNEUMATIC CONTROL SYSTEM

3. Introduction to Pneumatic systems
Pneumatic products represent a multi-billion dollar industry today.
Pneumatic devices are used in many industrial applications.
Most pneumatic devices are designed to use clean dry air as an energy source.
The actuator then converts that compressed air into mechanical motion. The type of motion produced depends on the design of the actuator.

4. Introduction to Pneumatic systems
Electro pneumatic system consist of both electrical and pneumatic system.
Usage of electro pneumatic includes:
Packaging
Stamping, shearing & embossing part
Sorting part
Component stacking
Material stacking

5. Introduction to Pneumatic systems
Example of Pneumatic Diagram

6. Introduction to Pneumatic systems
Example of Electrical Diagram

7. System components
Solenoid valve
Cylinder
Compressor
Actuator

8. System components

9. System components: SOLENOID VALVE Solenoid valve symbols

10. System components: DIRECTIONAL CONTROL VALVE
Directional control valve is attached with solenoid, so that it can move forward & backward.
The movement of the valve allows compressed air to go into the airway of the valve to control the movement of the cylinder.

11. System components: DIRECTIONAL CONTROL VALVE
POSITIONS (Y)
[ X / Y ] WAY VALVE
PORTS (X)
For this EXAMPLE:
X = 4 ; Y = 2
4 / 2 WAY VALVE

12. System components: DIRECTIONAL CONTROL VALVE
Valve switching positions are represented by squares.
The number of switching positions of the valve is shown by the number of squares.
The arrow show the direction of flow paths.
Shut off positions are identified in the boxes by lines at right angles.
The connection (inlet and outlet ports) are shown by lines on the outside of the box and are drawn in the initial position.

13. System components: DIRECTIONAL CONTROL VALVE
Port or
connection
DIN ISO
5599
Lettering
System
Pressure port 1 P
Exhaust port 3 R
Exhaust ports
5,3
R,S
Signal
outputs
2,4
B,A

14. System components: DIRECTIONAL CONTROL VALVE

15. System components: CYLINDER Single acting cylinder
SV DE-ENERGIZE
Rest position, air supply shut off, cylinder retracted by the spring.
When switch closed, current flow to the circuit & start to energize solenoid coil.
Magnetic field created, push the plunger that will slide the valve to the right.

16. System components: CYLINDER Single acting cylinder
This will allow the air to flow inside the piston & extend the piston.
If switch released, the valve will slide back & cause the air to stop.
SV ENERGIZE

17. System components: CYLINDER Double acting cylinder
Rest position, air supply flowing to the cylinder piston rod via the valve and pushing the piston at rest / retraction position - no current flow to the solenoid
Switch closed, energized solenoid coil-magnetic field develop at solenoid.
SV DE-ENERGIZE

18. System components: CYLINDER Double acting cylinder
Magnetic filed develop push the plunger and cause valve slide to the right.
This allow air flow inside the piston via the other port & push/extend the valve.
When switch released, current not flow, cause the magnetic field weaker and vanish - valve slide to initial position.
SV ENERGIZE

19. System components: CYLINDER
Single acting cylinder
Double acting cylinder

20. System components: DIRECTIONAL CONTROL VALVE

21. System components: DIRECTIONAL CONTROL VALVE

22. System components: CYLINDER

23. Hydraulic systems

24. Control of pneumatic systems using PLC

25. Control of pneumatic systems using PLC
Another consideration is important for double solenoid valves. Most double solenoid valves cannot withstand simultaneous activation of both coils. One of the circuits shown in Figure LC-8 should be considered to prevent this occurrence. In both circuits, SOL-A and SOL-B are attached to the same solenoid valve. A single control relay (CR-1) is used in the left circuit to activate contacts (CR-1A and CR-1B) which cannot be closed simultaneously. The circuit on the right uses the same principle for each solenoid coil.