1. PROGRAMMABLE LOGIC CONTROLLER (PLC) AND AUTOMATION
EJ501
EJ501
PROGRAMMABLE LOGIC CONTROLLER (PLC) AND AUTOMATION

2. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS
Objective
2. Logical Actuators
Describe solenoid, valves, cylinders and motors.
Explain solenoid, valves, cylinders and motors operations.
Use simple electro-hydraulics and electro-pneumatics systems using logical actuators based on simple logical control/automation.

3. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS
Solenoid

4. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS
Valves

5. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS
Cylinder

6. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS
Motor

7. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS
Hydraulic

8. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS
Electro -Hydraulic
The word electrohydraulic has two meanings for two highly different operations. It can stand for an electrical control device that makes precise adjustments in a hydraulic system. Also, it can mean a chemical reaction that is created by firing short, powerful electrical impulses into or directly beneath the surface of a body of liquid.
Perhaps the most well-known electrohydraulic device is an automobile's power steering unit — also called an electrohydraulic actuator. The unit combines high power with a high degree of accuracy to adjust for the minute movements of the steering wheel in a vehicle. This type of technology, where electrical components are used to increase the accuracy of hydraulic movements, can be applied to almost any situation where hydraulics is used.

9. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS
Electro -Hydraulic

10. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS
Pneumatic

11. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS
Electro - Pneumatic
The electro-pneumatic action is a control system for pipe organs, whereby air pressure, controlled by an electric current and operated by the keys of an organ console, opens and closes valves within wind chests, allowing the pipes to speak. This system also allows the console to be physically detached from the organ itself. The only connection was via an electrical cable from the console to the relay, with some early organ consoles utilizing a separate wind supply to operate combination
pistons.
The basic operation of the system is as follows: when the organist selects a stop and depresses a key, an electric circuit is completed, causing a low-voltage current to flow from depressed key, through the stop-tab switch, and on through the cable to the electro-pneumatic relay. The relay interprets the command from the console and sends an electric current to the appropriate solenoid. The solenoid is energized, causing the pipe valve connected to it to open, which emits compressed
air into the pipe, allowing the pipe to speak.

12. UNIT 2b LOGICAL SENSORS AND ACTUATORS
EJ501
UNIT 2b LOGICAL SENSORS AND ACTUATORS