Electro Pneumatics Prac - Exercise 1

Summary

In this instructional video, students learn to build an electro-pneumatic circuit for transferring parts from a conveyor belt using a single-acting cylinder. The instructor explains the function of limit switches, a double-acting cylinder, and a latching push button switch. The circuit diagram details the connections between components, including relays and solenoids, to ensure automatic operation. By tracing the electrical connections, students gain hands-on experience in wiring and understanding how the system activates and resets. The demonstration concludes with the successful operation of the circuit, reinforcing key concepts in electronics and automation.

Takeaways

• 😀 The exercise focuses on building an electro-pneumatic circuit for a sorting device using a conveyor belt.
• 🔄 A single-acting cylinder is used to push parts off the conveyor, with the piston rod automatically returning to its initial position.
• 🔌 Limit switches or sensors are essential for detecting the positions of cylinders in the circuit.
• 🛠️ The circuit incorporates a double-acting cylinder controlled by a spring-return five two-way valve, activated by a solenoid.
• ⚡ The power supply provides a 24-volt line, with red connections indicating 24 volts and blue for zero volts.
• 🔄 The circuit includes push button switches that can be normally open or normally closed, allowing for various configurations.
• 🔗 A latching circuit is employed, enabling the system to remain active after releasing the push button.
• 🕹️ The connection of relays allows for simultaneous control of multiple switches in the circuit.
• 🛑 Each component must be wired correctly according to the circuit diagram for proper functionality.
• ✅ The final system tests show that pressing the start button activates the cylinder and that the relay resets when the cylinder reaches the limit switch.

Q & A

What is the main function of the circuit being built in this exercise?

The main function of the circuit is to transfer parts from a conveyor belt using a push button switch to activate a single acting cylinder, which pushes the part off the conveyor.

Why are limit switches or sensors necessary in the circuit?

Limit switches or sensors are necessary to detect the position of the cylinders and to ensure the system can perform the next function automatically.

What type of valve is used in this circuit, and how is it activated?

A spring return, single solenoid activated, double acting valve is used in the circuit. It is activated by applying current to one side, and it resets when the current is removed.

What does the term 'normally closed switch' mean in the context of this circuit?

'Normally closed switch' means that the circuit is closed (allowing current to flow) until the switch is activated, which opens the circuit and stops the current flow.

How does the latching circuit function in this setup?

The latching circuit allows the push button switch to stay on after it is pressed, maintaining the current flow through the relay until the next part of the sequence is completed.

What role do relays play in this electro-pneumatic circuit?

Relays serve to control the flow of electrical power within the circuit, allowing for multiple functions to be activated simultaneously through a single relay activation.

How does the electrical circuit complete when the push button is pressed?

When the push button is pressed, power flows from the 24-volt line through the push button, the normally closed limit switch, and to the relay, completing the circuit and activating the system.

What happens when the cylinder reaches the end of its stroke?

When the cylinder reaches the end of its stroke, it hits the limit switch, which turns off the relay and resets the valve, allowing the cylinder to return to its retracted position.

Can you explain the difference between normally open and normally closed configurations in this circuit?

Normally open configurations mean that the switch remains open until activated, while normally closed configurations mean the switch remains closed until activated, affecting how the circuit operates.

What are the components mentioned in the script used for electrical connections?

The components mentioned include push button switches, limit switches, relays, and the power supply lines marked with red for 24 volts and blue for zero volts.