Hydraulics and Pneumatics: Unit IV: Pneumatic and Electro Pneumatic Systems
Review and summary
Pneumatic and Electro Pneumatic Systems - Hydraulics and Pneumatics
Review and summary: Pneumatic and Electro Pneumatic Systems - Hydraulics and Pneumatics
REVIEW AND SUMMARY • The electrical control devices are widely used to improve the overall control flexibility of fluid power systems. • Types: The most commonly used electrical control devices are: 1. Push-button switches, 2. Limit switches, 3. Pressure switches, 4. Temperature switches, 5. Solenoids, 6. Relays, and 7. Timers. • The push-button switches are mainly used for starting and stopping of the machinery. They also provide manual operation when an emergency arises. • The limit switches are used to identify the extreme limits of the cylinder actuation. • The pressure switches are used to sense a change in pressure automatically, and opens or closes an electrical switch when a predetermined pressure is reached. • The temperature switches are used to sense a change in temperature automatically, and opens or closes an electrical switch when a predetermined temperature is reached. • A solenoid is an electromagnetic mechanical transducer that converts an electrical signal into a mechanical output force. • An indicator lamp is used to indicate the state of a specific circuit component. • Relays are commonly used to open to close the contacts and thereby energize or de- energize solenoids. • Timers are time delay switches used to control the time duration of a working cycle. • A ladder diagram is a representation of hardware connections between switches, relays, solenoids, etc., which constitute the basic components of an electrical control system. • At the end of the chapter, the various electrohydraulic circuits have been analyzed with the help of ladder diagrams. Electrical Control devices Push-button switches SPST-NO SPST-NC Pressure switches PS-NO PS-NC Temperature switches TS-NO Time-delay relays Ladder diagram Legs Rungs DPST-NO/NC DPDT-NO/NC Momentary switches Limit switches LS-NO LS-NC TS-NC Solenoids Indicator lamp Relays Timers Electrohydraulic circuits Dual-cylinder sequencing circuit Regenerate circuitKEY TERMS ONE SHOULD REMEMBER
Hydraulics and Pneumatics: Unit IV: Pneumatic and Electro Pneumatic Systems : Tag: : Pneumatic and Electro Pneumatic Systems - Hydraulics and Pneumatics - Review and summary
Hydraulics and Pneumatics: Unit IV: Pneumatic and Electro Pneumatic Systems
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Hydraulics and Pneumatics
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