Pneumatic Control Circuit Wiring - 5

Question 1

What are Pneumatic systems?

Answer 1

Pneumatic systems use pressurized gas, typically compressed air, as their power source.

Question 2

What is an example of a pneumatic system?

Answer 2

A Jackhammer.

Question 3

What five basic components are consisted of in a pneumatic system?

Answer 3

• Power Input Devices
• Control Devices
• Power Output Devices
• Conductors
• Gas

Question 4

What is the power input device that provides pneumatic power to the system?

Answer 4

A Pump. Also called an Air Compressor.

Question 5

What does an Air Compressor do?

Answer 5

An Air Compressor draws air from the atmosphere, compresses it, and then pushes it into the supply line.

Question 6

Name a common control device used in a pneumatic system.

Answer 6

A Valve.

Question 7

What are Valves used for?

Answer 7

Valves are used to control the direction, pressure, and flow rate of the pressurized air in the system.

Question 8

List a Power Output Device used in a pneumatic system.

Answer 8

Actuators.

Question 9

What do actuators do

Answer 9

Actuators convert pneumatic power to mechanical power.

Question 10

Name two common types of pneumatic actuators.

Answer 10

• Cylinders

* Motors

Question 11

What type of motion do cylinders provide?

Answer 11

Linear motion.

Question 12

What type of motion do motors provide?

Answer 12

Rotary motion.

Question 13

What is a conductor in a pneumatic system?

Answer 13

A conductor is the pipe, tube, or hose that transmits the air between pneumatic components.

Question 14

What is the main conductor in a pneumatic system called?

Answer 14

The Supply Line.

Question 15

What is the most common gas used in a pneumatic system?

Answer 15

Air. (Air is a mixture of gases)

Question 16

Which three industries use pneumatic applications?

Answer 16

• Manufacturing
• Transportation
• Construction

Question 17

What features of pneumatic systems make them appealing?

Answer 17

• High Speed
• Clean Operation
• Low Cost

Question 18

What is an important concept in pneumatics?

Answer 18

Pressure.

Question 19

What is one common way to measure pneumatic pressure?

Answer 19

A Pressure Gauge.

Question 20

What units of measurement are used in a pressure gauge?

Answer 20

• US Customary Units (PSI)

* SI Metric Units (Pascals)

Question 21

What is a Pressure Regulator Valve?

Answer 21

Controls pressure flowing downstream from the air supply.

Question 22

Why is a Pressure Regulator Valve usually needed?

Answer 22

The air pressure needed for pneumatic system applications is often less than the pressure available from the main air supply.

Question 23

What does a pressure regulator valve consist of? (Six Components)

Answer 23

• Body
• Restricting Element
• Loading Element
• Adjustment Spring
• Adjustment Knob
• Poppet Spring

Question 24

Symbol for Pressure Regulator.

Answer 24

https://imgur.com/a/vBjNGCl

Question 25

What is the description of an Actuator?

Answer 25

Actuators are the pneumatic components that convert air power into mechanical power.

Question 26

What does a Cylinder (Type of Actuator) do?

Answer 26

A Cylinder converts air power into mechanical power in the form of linear motion.

Question 27

What does a pneumatic cylinder consist of?

Answer 27

A Piston/Rod that can move inside a barrel-shaped body.

Question 28

Double-Acting Cylinder Schematic Symbol

Answer 28

https://imgur.com/a/bd8nY4I

Question 29

What is a directional control valve (DCV)?

Answer 29

A DCV controls the direction of air flow.

Question 30

What do pneumatic DCV's have that specify them?

Answer 30

* Number of flow paths | * Number of Positions to which the valve can be moved

Question 31

A common type of DCV is a 5-ported, 4-way, 3-position. What are its applications?

Answer 31

Extend, Retract, and Stop in mid-position.

Question 32

What components does a 5-ported, 4-way, 3-position DCV consist of?

Answer 32

* Valve Body * Operator * Spool * Springs * Ports

Question 33

What type of DCV is designed to directly operate on the valve spool?

Answer 33

A Solenoid-Operated DCV.

Question 34

What are solenoids composed of?

Answer 34

Frame, Coil, and Armature.

Question 35

What does a 3-position DCV require?

Answer 35

Two solenoids. One on each end.

Question 36

What are pneumatic solenoid valves equipped with to allow the valve to be manually shifted?

Answer 36

One or more manual overrides.

Question 37

What is a schematic?

Answer 37

A Schematic is a circuit drawing that uses standard symbols to represent components.

Question 38

What is the purpose of a schematic circuit diagram?

Answer 38

It helps the user determine how a circuit operates.

Question 39

How do you interpret a pneumatic schematic?

Answer 39

Start at the air power supply and follow the lines to the individual components.

Question 40

What schematic is often shown alongside a control diagram?

Answer 40

Power diagram.

Question 41

What format is a control diagram shown in?

Answer 41

A Ladder Diagram.

Question 42

What format is a power diagram shown in?

Answer 42

A Schematic with the addition of electrical wiring connections.

Question 43

What diagrams are needed for connecting an Electro-pnuematic circuit?

Answer 43

Both a control diagram and power diagram.

Question 44

The control diagram shows the components that control the what?

Answer 44

The Electro-Pneumatic System.

Question 45

The power diagram shows the components that perform the what?

Answer 45

The Pneumatic Operation.

Question 46

What are several important points for proper wiring technique in electro-pneumatic control systems?

Answer 46

* Running Wires through Conduit * Wire Labeling * Terminal Blocks * Terminal Connection Methods

Question 47

Wires that are outside panel boxes are run through what?

Answer 47

Conduit.

Question 48

Constantly _____ each wire according to the ladder diagram.

Answer 48

Label.

Question 49

What do you use when exiting or entering a panel or junction box?

Answer 49

Terminal Blocks.

Question 50

What are typically connected in an electro-pneumatic system connected to wires that are routed from electrical panels.

Answer 50

Solenoid valves.

Question 51

The wires from an electrical panel are sometimes routed to a junction box before they are connected to what?

Answer 51

The Solenoid Valve.

Question 52

What three solenoid wiring connections are there?

Answer 52

* Direct Terminal Connection * Spliced Connection * DIN Connection

Question 53

What do some solenoid valves have that directly connect to the control wires?

Answer 53

Terminals.

Question 54

What are the steps for Direct Terminal Connection method?

Answer 54

1. Strip a portion of insulation from the wire. 2. Twist the end of the exposed wire if it is stranded. 3. Attach the wire under the terminal screw clamp. 4. Tighten the screw to secure the wire

Question 55

Some solenoid valves are connecting by ________ the control wires to fixed wires coming out of the solenoid.

Answer 55

Splicing.

Question 56

All wire splice connections must be contained inside a ...?

Answer 56

Junction Box.

Question 57

Wires are spliced to a solenoid valve wires using the following steps:

Answer 57

1. Remove junction box cover to expose the two wires. 2. Strip a portion of insulation from both wires. 3. Twist both wires together for several turns. 4. Cut the end of twisted wires to leave about 0.5 inch of exposed wire. 5. Attach a wire nut to the exposed wires. 6. Wrap electrical tape around the wire nut and wires. 7. Replace the junction box cover.

Question 58

Control wires are connected to the terminal block using the following steps:

Answer 58

1. Remove DIN housing from solenoid coil. 2. Remove terminal block from DIN housing. 3. Connect one wire to the positive terminal. 4. Connect the other wire to the negative terminal. 5. Place terminal block into the DIN housing. 6. Replace DIN housing back onto the solenoid coil.

Question 59

What is the description of a flow control valve?

Answer 59

Flow control valves restrict fluid flow in one direction and allow free flow in the other direction.

Question 60

A flow control valve allows you to adjust the _____ of the actuator in one direction when connected to either the inlet or outlet port.

Answer 60

Speed.

Question 61

You can control the Actuator's both __________ when connecting flow control valves to both ports.

Answer 61

Directions.

Question 62

What does a Meter-In circuit do?

Answer 62

A Meter-In Circuit provides precise control and is a common method of controlling speed.

Question 63

Why is a Meter-In Circuit only used in a couple applications?

Answer 63

It is only used to control cylinder speeds when the load opposes the rod movement.