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L e a v i n g C e r t i f i c a t e

Technology

Pneumatics

Practical Circuit Building

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1. Identify the components on the SMC Kits.

2. Familiarise yourself with the Pneumatic valve ports nomenclature. (Nostandard nomenclature, Letters and Numbers used, we are keeping to theNumber system to avoid confusion? SMC kits use Letter system.)

Pressure Regulator

Solenoid valves Pneumatic Pilot valves

Flow controlvalves

Two pressure valve

Compressor

3/2 Way directionalcontrol valve normallyclosed

3/2 Way directionalcontrol valve normallyopen

5/2 Way directionalcontrol valve

Number of Ports.

Number of Positions

Number of Ports.

Number of Positions

Compressed AirManifold

3/2 Pushbuttonvalves

Single acting &double Actuators

Shuttle Valve

3/2 Lever valves

3. First simple circuit, 3/2 Pushbutton valve with a single acting actuator.

4

Fl

Single actingActuator Spring

. Aa

return.

CAi

ow co

val

ret

3 Port, 2 PositionPushbutton control

ctuator speed control using a 3/2 Pushbutton valve with a single actingctuator and flow control valve.

ompressedr Supply

ntrol valve

valve

urn.

3 Port, 2 PositionPushbutton control

Single actingActuator Spring

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ve

3

5. Second circuit, a 3/2 pushbutton valve, a 5/2 Pilot controlled pneumaticvalve and a double acting actuator.

6. Double acting actuator speed control using a 3/2 pushbutton valve, a 5/2Pilot controlled pneumatic valve and two flow control valves.(Demonstrates how the piston speed may be different on the in and outstrokes.)

Flow controlvalves

Double actingactuator

5/2 Pilot valve

3/2 PushButton Valve

Compressed Airsupply

5/2 Pilot valve

Double actingActuator

3 Port, 2 PositionPushbutton control

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valve

Spring return

return.

Logic circuits.

7. The OR Logic circuit using two 3/2 pushbutton valves, a shuttle valve anda single acting actuator.

8. The AND circuit using two 3/2 pushbutton valves, a two pressure valveand a single acting actuator.

Shuttle valve

Two pressure valve

.

valve

3 Port, 2 PositionPushbutton control

Single actingActuator

Single actingActuator Spring

v

3 Port, 2 PositionPushbutton control

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alve

5 © t4 Galway Educatio

9. Semi automatic circuit using a 3/2 pushbutton control valve, a 3/2 rollerlever valve, a 5/2 pilot valve, a single and a double acting actuator.

10. Fully automatic circuit using a 5/2 Solenoid control valve, a Single and aDouble acting actuator. Control is achieved using a feedback signal to thePIC Logicator interface board and Software.

Programming cable fromLaptop

Compressed Air supplyManifold

Single actingActuator

PIC ControlProgramme

board to Solenoid

Input to PIC controlboard from Reedsensor

Power supply cable

sensor

5/2 Solenoid

3/2 Pushbutton valve

3/2 roller Levervalve

5/2 Pilot valveSingle actingactuator

Double acting actuator

Doubleacting

n

a

T

C

Output from PIC control

Centre

ctuator

piecevalve

ontrol valve

Reedswitch

3/2 Roller leverPneumatic control

Fully Automatic Pneumatic Circuit

Simple PIC Logicator Control programme for the Automatic circuit.

5/2 Solenoid valveSolenoid Powersupply signal

Compressed Airsupply

Compressed Airsupply

Single actingActuator

Double actingActuator

Proximitysensor

Switch operatedby Proximitysensor

3/2 roller lever valve

The programme starts and goesto the decision box, checks tosee if Input 7 is High. If it is low itgoes around the right hand loopand checks again until it gets aHigh. When Input 7 is High, itmakes Output 1 High. It thenwaits 1 second and makesOutput 1 low. It follows to looparound to the top of the decisionbox and checks again for thenext cycle. This simpleprogramme switches on and offthe Solenoid controlling the flowof compressed air to the

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Actuator.

ay Education C

entre 6