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© t4 Galway Education Centre 0
L e a v i n g C e r t i f i c a t e
Technology
Pneumatics
Practical Circuit Building
1 © t4 Galway Education Centre
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
© t4 Galway Education Centre 2
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
© t4 Galway Education Centre
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
© t4 Galway Education Centre 4
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
© t4 Galw
Actuator.
ay Education C
entre 6