Laboratory EPN

Electro-Pneumatics Laboratory

ELECTRO-PNEUMATICS LABORATORY EXPERIMENTS

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GENERAL INSTRUCTIONS AND SAFETY PRECAUTIONS •

The arrang arrangeme ement nt of the equipm equipment ent on the workstation should be as shown in the evaluated evaluated electro-pne electro-pneumati umaticc circuit circuit diagram sketch.

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The working pressure of pe=5 bar shall be at the pressure regulator of the air service unit.

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The The pneum pneumat atic ic comp compone onent ntss are are to be firmly connected with plastic tubes and acce access ssor orie iess accor accordi ding ng to the the circ circui uitt diagram.

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Also observe the proper removal of the conn connec ecti tion onss of the the hose hosess and and othe otherr accessories from the components.

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The workin working g voltag voltagee for the electr electrical ical wiring diagrams shall be provided 2! "# power supply unit and an electric manifold unit.

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The The elec electr tric ical al comp compone onent ntss are are to be firmly firmly connected connected with $umper wires and acce access ssor orie iess accor accordi ding ng to the the circ circui uitt diagram

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%andle %andle the component componentss with with care care and caution.

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Arra Arrang ngee the the comp compon onen ents ts and and equipment after use.

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&e guided accordingly with your sub$ect instructor.

othe otherr

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ELECTRO-PNEUMATIC CONTROL CHAIN

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ENERGY GROUP )neu )neuma mati ticc and and elec electr tric ical al ener energi gies es are are required in electro-pneumatic controls. +ign +ignal al elem elemen ents ts,, cont contro roll elem elemen ents ts and and act actuati uating ng elem elemen entts are are supp suppli lied ed wit with electrical energy. Actuating elements and drive elements are supplied with pneumatic energy. SIGNAL ELEMENTS The The signa signali ling ng elem element entss conve convert rt manua manuall comma command ndss and and mech mechan anic ical al moti motion onss into into electrical signals.

DRIVE ELEMENT #ylinder

Y1

ACTUATI NG ELEMENT "irectional #ontrol !alve

Pneumatic Pneumatic Diagram Diagram

CONTROL ELEMENTS The control elements connect the approaching signals and direct these to the components of the actuating element group. ACTUATING ELEMENTS The The act actuati uating ng elem elemen entts take ake over over the func functi tion on of conn connec ectting ing or conv conver ertting ing electrical energy and pneumatic energy DRIVE ELEMENTS The drive elements convert the pneumatic energy into mechanical energy and motions.

Air #ompressor

'lectr ic (otor

SIGNALI NG ELEMENT )ush24V button

*elay #ontact L1

S1

K1

K1

Y1

0V

N

Electrical Electrical Wiring Diagram Diagram CONTR *elay #oil

REPRESENTATION REPRESENTATION OF PNEUMATIC CIRCUIT DIAGRAMS

OL ELEMENT +olenoid

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EXPERIMENT 1 COMMAND-VARIABLE CONTROL OF CYLINDERS WITH SINGLE -SOLENOID VALVES

Objective

This eperiment provides basic know-how and skills on the proper design, set-up and operation of electro-pneumatic controls using the direct and indirect control of a single-acting cylinder as an eample.

List of Components and Equipment Qty.

 

Des!"#t"

%$)neumatic power supply Air service unit /filter with water separator, pressure regulator and pressure gauge0 with 12 directional control ball valve



)neumatic "istributor, 3-fold



2!"# power supply unit



'lectric (anifold unit



#ontrol switch-2 pushbutton unit



+ingle-acting cylinder

 

"ouble-acting cylinder 12 directional control valve, electrically operated, spring return, closed neutral position



52 directional control valve, electrically operated, spring return, closed neutral position 

*elay units,

 changeover contacts

207

)neumatic and 'lectrical Accessories

Problem Definition 1

. 4pon pressing a normally-open keyoperated pushbutton switch, the solenoid coil of a directional valve shall be directly energied by this electrical switch causing the cylinder rod of a single-acting cylinder to move outward to its maimum etended position. 2. The piston rod of the single-acting cylinder should remain etended as long as the button is pressed. 1. 4pon releasing the said electrical switch, solenoid coil of that directional valve will cause the piston rod of the singleacting cylinder to retract and return to its rear-end position.


. 4pon pressing a normally-open keyoperated pushbutton switch, the coil of an electro-mechanical relay shall be energied by this electrical switch causing the electrical contact of this relay to indirectly energie the solenoid coil of a directional valve which then causes the cylinder rod of a doubleacting cylinder to move outward to its maimum etended position. 5. The piston rod of the double -acting cylinder should remain etended as long as the button is pressed. 3. 4pon releasing the said electrical switch, the coil of the electro-mechanical relay shall relieved of its electrical signal, which then causes the electricallycontrolled directional valve to be relieved of its pilot energy which then causes the cylinder rod of a doubleacting cylinder to retract and return to its rear-end position


Procedure

. +ketch the pneumatic circuit diagram based on the stated problem definition. 2. +ketch the electrical circuit diagram based on the stated problem definition. 1. %ave your instructor check your circuit diagram for proper evaluation. . 6ather the required components and arranged them properly on the workstation and in accordance with the verified electro-pneumatic circuit diagram. 5. #onnect the pneumatic components with plastic tubes and accessories according to the circuit diagram. 3. #onnect the electrical components with $umper wires and accessories according to the circuit diagram. 7. (ake sure that the air service unit switch is in the off position and double check the connections of the hoses and other accessories if they are firmly coupled to the components for safe operation. 8. Turn on the pneumatic power supply /compressor0 compressed-air distributor. 9. Turn on the switch the air service unit and set the working pressure of pe=5 bar at the pressure regulator. :. Turn on the 2"#! power supply distributor. . The eperiment is started and the proper function is verified. 2. *eturn and arrange the components and other equipment properly upon completion of the eperiment.

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1. "raw the pneumatic circuit diagram on the data sheet. +tate your observations and conclusion.


EXPERIMENT 1 DATA SHEET COMMAND-VARIABLE CONTROL OF CYLINDERS WITH SINGLE -SOLENOID VALVES Pneumatic Circuit Diagram

Electrical Wiring Diagram

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210

Pneumatic Circuit Diagram


Observation and Conclusion

EXPERIMENT & HOLDING-ELEMENT CONTROL OF A DOUBLE-ACTING CYLINDER WITH AN

Electro-Pneumatics Laboratory IMPULSE VALVE' CONTROLLED

DIRECTLY

Objective

This eperiment demonstrates the control of a double-acting cylinder with an electrically controlled 52 directional control impulse valve without the use of a relay.

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2. The piston rod of the double -acting cylinder should remain etended even after the pushbutton is released. 1. 4pon momentarily pressing another normally-open key-operated pushbutton switch, the opposite solenoid coil of the directional valve shall be directly energied by this second electrical switch causing the cylinder rod of a double-acting cylinder to retract and return to its rear-end position.


 

Des!"#t"

%$. The piston rod of the double -acting cylinder should remain retracted even after the latter pushbutton is released.

)neumatic power supply Air service unit /filter with water separator, pressure regulator and pressure gauge0 with 12 directional control ball valve

5. %ence, each pushbutton switch has its own unique function of either etending or retracting the cylinder only.

Procedure

 








 


"ouble-acting cylinder 52 directional control valve, electrically operated both ways )neumatic and 'lectrical Accessories

Problem Definition

. 4pon momentarily pressing a normallyopen key-operated pushbutton switch, the solenoid coil of a directional valve shall be directly energied by this electrical switch causing the cylinder rod of a double-acting cylinder to move outward to its maimum etended position.

. +ketch the pneumatic circuit diagram based on the stated problem definition. 2. +ketch the electrical circuit diagram based on the stated problem definition. 1. %ave your instructor check your circuit diagram for proper evaluation. . 6ather the required components and arranged them properly on the workstation and in accordance with the verified electro-pneumatic circuit diagram. 5. #onnect the pneumatic components with plastic tubes and accessories according to the circuit diagram. 3. #onnect the electrical components with $umper wires and accessories according to the circuit diagram. 7. (ake sure that the air service unit switch is in the off position and double check the connections of the hoses and other

Electro-Pneumatics Laboratory accessories if they are firmly coupled to the components for safe operation. 8. Turn on the pneumatic power supply /compressor0 compressed-air distributor. 9. Turn on the switch the air service unit and set the working pressure of pe=5 bar at the pressure regulator. :. Turn on the 2"#! power supply distributor. . The eperiment is started and the proper function is verified. 2. *eturn and arrange the components and other equipment properly upon completion of the eperiment. 1. "raw the pneumatic circuit diagram on the data sheet. +tate your observations and conclusion.

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EXPERIMENT & DATA SHEET HOLDING-ELEMENT CONTROL OF A DOUBLE-ACTING CYLINDER WITH AN IMPULSE VALVE' DIRECTLY CONTROLLED Pneumatic Circuit Diagram


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EXPERIMENT ( STOPPING CONTROL OF A DOUBLEACTING CYLINDER WITH A )*( DIRECTIONAL CONTROL VALVE WITH

Electro-Pneumatics Laboratory A CLOSED MID-POSITION' INDIRECTLY CONTROLLED

Objective

The aim of this eperiment is to demonstrate the most often applied solution for stop control in electro-pneumatics. A 51 directional control valve with a closed mid-position is used as an actuator.


 

Des!"#t"





2

;ne-way









 

"ouble-acting cylinder 51 directional control valve, electrically operated, closed mid position, spring centered

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an electro-mechanical relay shall be energied by this electrical switch causing the electrical contact of this relay to indirectly energie the solenoid coil of a directional valve which then causes the cylinder rod of a doubleacting cylinder to slowly move outward to its maimum etended position such that the length of its forward stroke is dependent upon the duration of the pressing of the pushbutton. 2. 4pon pressing another normally-open key-operated pushbutton switch, the coil of another electro-mechanical relay shall be energied by this second electrical switch causing the electrical contact of this relay to indirectly energie the opposite control-solenoid coil of the same directional valve which then causes the cylinder rod to slowly move inward to its maimum retracted position such that the length of its backward stroke is also dependent upon the duration of the pressing of that pushbutton. 1. The piston rod of the double -acting cylinder should remain in whatever position it has reached when either of the two pushbuttons is released or not being pressed. . %ence, each pushbutton switch has its own unique function of either etending or retracting the cylinder to a certain length of stroke only.

Procedure

2

*elay units  changeover contacts

. +ketch the pneumatic circuit diagram based on the stated problem definition.

)neumatic and 'lectrical Accessories 2. +ketch the electrical circuit diagram based on the stated problem definition. Problem Definition

. 4pon pressing a normally-open keyoperated pushbutton switch, the coil of

1. %ave your instructor check your circuit diagram for proper evaluation.

Electro-Pneumatics Laboratory . 6ather the required components and arranged them properly on the workstation and in accordance with the verified electro-pneumatic circuit diagram. 5. #onnect the pneumatic components with plastic tubes and accessories according to the circuit diagram. 3. #onnect the electrical components with $umper wires and accessories according to the circuit diagram. 7. (ake sure that the air service unit switch is in the off position and double check the connections of the hoses and other accessories if they are firmly coupled to the components for safe operation. 8. Turn on the pneumatic power supply /compressor0 compressed-air distributor. 9. Turn on the switch the air service unit and set the working pressure of pe=5 bar at the pressure regulator. :. Turn on the 2"#! power supply distributor. . The eperiment is started and the proper function is verified. 2. *eturn and arrange the components and other equipment properly upon completion of the eperiment. 1. "raw the pneumatic circuit diagram on the data sheet. +tate your observations and conclusion.

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EXPERIMENT ( DATA SHEET STOPPING CONTROL OF A DOUBLEACTING CYLINDER WITH A )*( DIRECTIONAL CONTROL VALVE WITH A CLOSED MID-POSITION' INDIRECTLY CONTROLLED Pneumatic Circuit Diagram


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EXPERIMENT + LOGICAL CONTROL OF A DOUBLEACTING CYLINDER WITH A SINGLE--

Electro-Pneumatics Laboratory SOLENOID VALVE AND A DOUBLESOLENOID VALVES'

Objective

The aim of this eperiment is to convey the understanding for the logical A>"? and ;*? functions in relay technology.


 

Des!"#t"








219

acting cylinder to assume a retracted position. 2. 4pon pressing either of the two normally-open key-operated pushbutton switches alone, the coil of its corresponding electro-mechanical relay shall be energied by the actuated electrical switch causing the electrical contact of that relay to indirectly energie the solenoid coil of a singlesolenoid valve which then causes the cylinder rod of the double-acting cylinder to move outward to its maimum etended position. 4pon releasing the chosen pushbutton, the cylinder rod will retract and return to its rear-end position. 1. 4pon pressing both pushbutton switches /not necessarily being at the same time0, the cylinder rod shall also assume a retracted position.








2

"ouble-acting cylinder



52 directional control valve, electrically operated, spring return,



52 directional control valve, electrically operated both ways 2

*elay units,




. 4pon pressing neither of two keyoperated pushbutton switches, the spring of a single-solenoid spring return valve shall cause the cylinder rod of a double-

. 4pon pressing neither of two keyoperated pushbutton switches, the double-solenoid valve shall cause the cylinder rod of a double-acting cylinder to assume a retracted position. %ence, the opposite solenoid should be initially energied by the proper relay contact arrangement. 5. 4pon pressing either of the two normally-open key-operated pushbutton switches alone, the coil of its corresponding electro-mechanical relay shall be energied by the actuated electrical switch causing the electrical contact of that relay to indirectly energie the solenoid coil of a doublesolenoid valve which then causes the cylinder rod of the double-acting cylinder to move outward to its maimum etended position. >ote that when the solenoid is energied, the initially energied opposite solenoid

Electro-Pneumatics Laboratory should be de-energied at the same time. 4pon releasing the chosen pushbutton, the cylinder rod will retract and return to its rear-end position. 3. 4pon pressing both pushbutton switches /not necessarily being at the same time0, the cylinder rod shall also assume a retracted position.

Procedure

. +ketch the pneumatic circuit diagram based on the stated problem definition. 2. +ketch the electrical circuit diagram based on the stated problem definition. 1. %ave your instructor check your circuit diagram for proper evaluation. . 6ather the required components and arranged them properly on the workstation and in accordance with the verified electro-pneumatic circuit diagram. 5. #onnect the pneumatic components with plastic tubes and accessories according to the circuit diagram. 3. #onnect the electrical components with $umper wires and accessories according to the circuit diagram. 7. (ake sure that the air service unit switch is in the off position and double check the connections of the hoses and other accessories if they are firmly coupled to the components for safe operation. 8. Turn on the pneumatic power supply /compressor0 compressed-air distributor. 9. Turn on the switch the air service unit and set the working pressure of pe=5 bar at the pressure regulator.

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:. Turn on the 2"#! power supply distributor. . The eperiment is started and the proper function is verified. 2. *eturn and arrange the components and other equipment properly upon completion of the eperiment. 1. "raw the pneumatic circuit diagram on the data sheet. +tate your observations and conclusion.


EXPERIMENT + DATA SHEET LOGICAL CONTROL OF A DOUBLEACTING CYLINDER WITH A SINGLE-SOLENOID VALVE AND A DOUBLESOLENOID VALVES' Pneumatic Circuit Diagram


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Pneumatic Circuit Diagram



EXPERIMENT ) PRIORITY CONTROL OF A DOUBLEACTING CYLINDER WITH A SINGLE-SOLENOID VALVE' SPRING RETURN'


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to move outward to its maimum etended position and stay etended. Objective

@n this eperiment, the most common priority control methods for actuating circuit systems are demonstrated as well as the various possible circuits with latching /storage circuits0 using relay.


 

Des!"#t"











2


2


2

52 directional control valve, electrically operated, spring return, 1

*elay units,



Problem Definition

. @nitially, upon momentarily pressing a key-operated pushbutton switch, the coil of an electro-mechanical relay shall be energied by this electrical switch causing the electrical contact of this relay to indirectly energie the solenoid coil of a directional valve causing the cylinder rod of a double-acting cylinder

2. 4pon momentarily pressing another keyoperated pushbutton switch, the coil of another electro-mechanical relay shall be energied by this electrical switch causing the electrical contact of this relay to indirectly energie the solenoid coil of another directional valve causing the cylinder rod of another double-acting cylinder to move outward to its maimum etended position and stay etended. >ote that the first cylinder will now move to its maimum retracted position and stay retracted the same time the second cylinder will etend. 1. 4pon momentarily pressing the first pushbutton switch again, the coil of the first electro-mechanical relay shall be energied again by this electrical switch causing the electrical contact of this relay to indirectly energie the solenoid coil of the first directional valve causing the cylinder rod of the first double-acting cylinder to move outward to its maimum etended position and stay etended. >ote that the second cylinder will now move to its maimum retracted position and stay retracted the same time the first cylinder will etend. . %ence, whichever pushbutton switch is actuated at any time shall cause its own controlled cylinder to etend and stay etended the same time making the other cylinder to retract and stay retracted. 5. %owever, upon momentarily pressing a third key-operated pushbutton switch, the cylinder rod of any of the two cylinders that is etended at any time shall be retracted and stay retracted.

Procedure

. +ketch the pneumatic circuit diagram based on the stated problem definition.


2. +ketch the electrical circuit diagram based on the stated problem definition. 1. %ave your instructor check your circuit diagram for proper evaluation. . 6ather the required components and arranged them properly on the workstation and in accordance with the verified electro-pneumatic circuit diagram. 5. #onnect the pneumatic components with plastic tubes and accessories according to the circuit diagram. 3. #onnect the electrical components with $umper wires and accessories according to the circuit diagram. 7. (ake sure that the air service unit switch is in the off position and double check the connections of the hoses and other accessories if they are firmly coupled to the components for safe operation. 8. Turn on the pneumatic power supply /compressor0 compressed-air distributor. 9. Turn on the switch the air service unit and set the working pressure of pe=5 bar at the pressure regulator. :. Turn on the 2"#! power supply distributor. . The eperiment is started and the proper function is verified. 2. *eturn and arrange the components and other equipment properly upon completion of the eperiment. 1. "raw the pneumatic circuit diagram on the data sheet. +tate your observations and conclusion.

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EXPERIMENT ) DATA SHEET PRIORITY CONTROL OF A DOUBLEACTING CYLINDER WITH A SINGLE-SOLENOID VALVE' SPRING RETURN' Pneumatic Circuit Diagram


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EXPERIMENT , TIMER CONTROL OF A DOUBLEACTING CYLINDER WITH A DOUBLE-SOLENOID VALVE


being a double-solenoid valve, the opposite solenoid should be initially energied to ensure that the cylinder rod is also initially retracted0.

Objective

This eperiment shows the use of an electric, switch-on timer relay element in a hold element control.


 

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2. &y the same time that the cylinder had etended, another pre-determined time should elapsed after which will cause the cylinder rod to automatically retract and return to its rear-end position and stay retracted.

Des!"#t"


1. >ote that only electro-mechanical relays and their corresponding contacts are to be used for the circuit and that roller limit switches and cylinder switches are not allowed for this problem.

Procedure













 2

"ouble-acting cylinder 52 directional control valve, electrically operated both ways

2

*elay unit,


2

Timer *elay units )neumatic and 'lectrical Accessories

Problem Definition

. 4pon momentarily pressing a keyoperated pushbutton switch, a predetermined time shall elapse after which will energie a double-solenoid valve shall cause an initially retracted cylinder rod of a double-acting cylinder to move outward to its maimum etended position and stay etended. />ote that

. +ketch the pneumatic circuit diagram based on the stated problem definition. 2. +ketch the electrical circuit diagram based on the stated problem definition. 1. %ave your instructor check your circuit diagram for proper evaluation. . 6ather the required components and arranged them properly on the workstation and in accordance with the verified electro-pneumatic circuit diagram. 5. #onnect the pneumatic components with plastic tubes and accessories according to the circuit diagram. 3. #onnect the electrical components with $umper wires and accessories according to the circuit diagram. 7. (ake sure that the air service unit switch is in the off position and double check the connections of the hoses and other accessories if they are firmly coupled to the components for safe operation.

Electro-Pneumatics Laboratory 8. Turn on the pneumatic power supply /compressor0 compressed-air distributor. 9. Turn on the switch the air service unit and set the working pressure of pe=5 bar at the pressure regulator. :. Turn on the 2"#! power supply distributor. . The eperiment is started and the proper function is verified. 2. *eturn and arrange the components and other equipment properly upon completion of the eperiment. 1. "raw the pneumatic circuit diagram on the data sheet. +tate your observations and conclusion.

228


EXPERIMENT , DATA SHEET TIMER CONTROL OF A DOUBLEACTING CYLINDER WITH A DOUBLE-SOLENOID VALVE Pneumatic Circuit Diagram


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EXPERIMENT  POSITION -DEPENDENT SEQUENTIAL CONTROL OF A DOUBLE-

Electro-Pneumatics Laboratory ACTING CYLINDER USING A DOUBLE-SOLENOID VALVE

Objective

This eperiment intends to facilitate the understanding of reciprocation controls of a lone cylinder and provides practical knowledge of setting up a simple reciprocating control system.


 

Des!"#t"



















52 directional control valve, electrically operated both ways 

*elay unit,


2

*oller limit switch or cylinder switch )neumatic and 'lectrical Accessories

231

maimum etended position. />ote that being a double-solenoid valve, the opposite solenoid should be initially energied to ensure that the cylinder rod is also initially retracted0. 4pon reaching its maimum outward stroke, the cylinder rod will automatically retract and return to its rear-end position. 2. 4pon reaching its initial position, the cylinder rod will again automatically etend and retract repeatedly until another key-operated pushbutton switch is momentarily pressed at any time to bring it to a complete stop but finishing the last sequence and returning the cylinder rod in its initial position. 1. %ence, $se/-$$# se0e%e $2 A3 Ausing roller limit switches or cylinder switches.

Procedure

. +ketch the pneumatic circuit diagram based on the stated problem definition. 2. +ketch the electrical circuit diagram based on the stated problem definition. 1. %ave your instructor check your circuit diagram for proper evaluation. . 6ather the required components and arranged them properly on the workstation and in accordance with the verified electro-pneumatic circuit diagram. 5. #onnect the pneumatic components with plastic tubes and accessories according to the circuit diagram.

Problem Definition

. 4pon momentarily pressing a keyoperated pushbutton switch, a doublesolenoid valve shall cause the cylinder rod of a double-acting cylinder to immediately to move outward to its

3. #onnect the electrical components with $umper wires and accessories according to the circuit diagram. 7. (ake sure that the air service unit switch is in the off position and double check

Electro-Pneumatics Laboratory the connections of the hoses and other accessories if they are firmly coupled to the components for safe operation. 8. Turn on the pneumatic power supply /compressor0 compressed-air distributor. 9. Turn on the switch the air service unit and set the working pressure of pe=5 bar at the pressure regulator. :. Turn on the 2"#! power supply distributor. . The eperiment is started and the proper function is verified. 2. *eturn and arrange the components and other equipment properly upon completion of the eperiment. 1. "raw the pneumatic circuit diagram on the data sheet. +tate your observations and conclusion.

232


EXPERIMENT  DATA SHEET POSITION-DEPENDENT SEQUENTIAL CONTROL OF A DOUBLE-ACTING CYLINDER USING A DOUBLE-SOLENOID VALVE Pneumatic Circuit Diagram


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EXPERIMENT 4 POSITION-DEPENDENT SEQUENTIAL CONTROL OF TWO DOUBLE-ACTING

Electro-Pneumatics Laboratory CYLINDER USING DOUBLE--SOLENOID VALVES

Objective

This eperiment intends to facilitate the understanding of sequential controls of two cylinders and provides practical knowledge of setting up a control system with two pneumatic drives. The actual design and practice in developing sequential diagram and pneumatic and electrical circuit diagram shall also be eercised.


 

Des!"#t"











2

"ouble-acting cylinder 52 directional control valve, electrically operated both ways

3

*elay unit,



*oller limit switch or cylinder switch



. 4pon detecting an ob$ect, an electronic sensor shall energie a double-solenoid valve which will cause the cylinder rod of a double-acting cylinder /cylinder A0 to immediately move outward to its maimum etended position. />ote that being double-solenoid valves, the opposite solenoids should be initially energied to ensure that the two cylinders rods are also initially retracted0. 4pon reaching its maimum outward stroke, another double-solenoid valve shall cause the cylinder rod of another double-acting cylinder /cylinder &0 to automatically move outward to its maimum etended position. 2. 4pon reaching cylinder &s maimum outward stroke, cylinder A will automatically retract and return to its rear-end position. >ote that during the retraction of cylinder A, cylinder & remains etended. 4pon reaching cylinder As initial position, cylinder & will automatically retract and return to its rear-end position.




2

235


'lectronic sensor unit

1. 4pon reaching cylinder &s initial position, the sequence of cylinder actions will then repeat continuously if the electronic sensors continuously detects the ob$ect, otherwise the sequence will automatically stop at &finishing the last sequence and returning the cylinder rods in their initial positions. . /;)T@;>AB0 The initiation of the sequence can also optionally triggered by a key-operated switch and stopped by another key-operated switch. 5. %ence, $#e%-$$# * $se/-$$# se0e%e $2 A3 B3 A- B- using roller limit switches cylinder switches.

)neumatic and 'lectrical Accessories Procedure Problem Definition

Electro-Pneumatics Laboratory . +ketch the pneumatic circuit diagram based on the stated problem definition. 2. +ketch the electrical circuit diagram based on the stated problem definition. 1. %ave your instructor check your circuit diagram for proper evaluation. . 6ather the required components and arranged them properly on the workstation and in accordance with the verified electro-pneumatic circuit diagram. 5. #onnect the pneumatic components with plastic tubes and accessories according to the circuit diagram. 3. #onnect the electrical components with $umper wires and accessories according to the circuit diagram. 7. (ake sure that the air service unit switch is in the off position and double check the connections of the hoses and other accessories if they are firmly coupled to the components for safe operation. 8. Turn on the pneumatic power supply /compressor0 compressed-air distributor. 9. Turn on the switch the air service unit and set the working pressure of pe=5 bar at the pressure regulator. :. Turn on the 2"#! power supply distributor. . The eperiment is started and the proper function is verified. 2. *eturn and arrange the components and other equipment properly upon completion of the eperiment. 1. "raw the pneumatic circuit diagram on the data sheet. +tate your observations and conclusion.

236


EXPERIMENT 4 DATA SHEET POSITION-DEPENDENT SEQUENTIAL CONTROL OF TWO DOUBLE-ACTING CYLINDER USING DOUBLE--SOLENOID VALVES Pneumatic Circuit Diagram


237


238


EXPERIMENT 5 TIME-BASED PROCESS CONTROL FOR POSITION-DEPENDENT SEQUENTIAL CONTROL OF TWO

Electro-Pneumatics Laboratory DOUBLE-ACTING CYLINDER DOUBLE--SOLENOID VALVES

USING

Objective

This eperiment intends to facilitate the understanding of incorporating a timer control circuit on sequential controls based process of two cylinders and provides practical knowledge of setting up a control system with two pneumatic drives.


 

Des!"#t"














2


2


*elay unit,







Timer *elay 4nit

239

. 4pon momentarily pressing a keyoperated pushbutton switch, a doublesolenoid valve shall be energied which will cause the cylinder rod of a doubleacting cylinder /cylinder A0 to immediately move outward to its maimum etended position. />ote that being double-solenoid valves, the opposite solenoids should be initially energied to ensure that the two cylinders rods are also initially retracted0. 4pon reaching its maimum outward stroke, another double-solenoid valve shall cause the cylinder rod of another double-acting cylinder /cylinder &0 to automatically move outward to its maimum etended position. 2. 4pon reaching cylinder &s maimum outward stroke, cylinder A will automatically retract and return to its rear-end position. >ote that during the retraction of cylinder A, cylinder & remains etended. 4pon reaching cylinder As initial position, cylinder & will automatically retract and return to its rear-end position. 1. 4pon reaching cylinder &s initial position, the sequence of cylinder actions will then repeat continuously until a predetermined time has elapsed which will then automatically stop the sequential movements of the cylinders at &- finishing the last sequence and returning the cylinder rods in their initial positions. . >ote that the sequence of cylinder movements can also be manually stopped at any instant without regards to the timer-based process control element when another key-operated pushbutton switch is momentarily pressed.


Problem Definition

t"6e-78se/ $se/-$$# 5. %ence, se0e%e $2 A3 B3 A- B- using roller limit switches cylinder switches.

Electro-Pneumatics Laboratory Procedure

. +ketch the pneumatic circuit diagram based on the stated problem definition. 2. +ketch the electrical circuit diagram based on the stated problem definition. 1. %ave your instructor check your circuit diagram for proper evaluation. . 6ather the required components and arranged them properly on the workstation and in accordance with the verified electro-pneumatic circuit diagram. 5. #onnect the pneumatic components with plastic tubes and accessories according to the circuit diagram. 3. #onnect the electrical components with $umper wires and accessories according to the circuit diagram. 7. (ake sure that the air service unit switch is in the off position and double check the connections of the hoses and other accessories if they are firmly coupled to the components for safe operation. 8. Turn on the pneumatic power supply /compressor0 compressed-air distributor. 9. Turn on the switch the air service unit and set the working pressure of pe=5 bar at the pressure regulator. :. Turn on the 2"#! power supply distributor. . The eperiment is started and the proper function is verified. 2. *eturn and arrange the components and other equipment properly upon completion of the eperiment.

240

1. "raw the pneumatic circuit diagram on the data sheet. +tate your observations and conclusion.


EXPERIMENT 5 DATA SHEET TIME-BASED PROCESS CONTROL FOR POSITION-DEPENDENT SEQUENTIAL CONTROL OF TWO DOUBLE-ACTING CYLINDER USING DOUBLE--SOLENOID VALVES Pneumatic Circuit Diagram


241


242


EXPERIMENT 19 COUNTER-BASED PROCESS CONTROL FOR POSITION-DEPENDENT SEQUENTIAL CONTROL OF TWO

Electro-Pneumatics Laboratory DOUBLE-ACTING CYLINDER DOUBLE--SOLENOID VALVES

USING

Objective

This eperiment intends to facilitate the understanding of incorporating a counter control circuit on sequential controls based process of two cylinders and provides practical knowledge of setting up a control system with two pneumatic drives.


 

Des!"#t"














2


2


*elay unit,







#ounter 4nit )neumatic and 'lectrical Accessories

Problem Definition

243

. 4pon momentarily pressing a keyoperated pushbutton switch, a doublesolenoid valve shall be energied which will cause the cylinder rod of a doubleacting cylinder /cylinder A0 to immediately move outward to its maimum etended position. />ote that being double-solenoid valves, the opposite solenoids should be initially energied to ensure that the two cylinders rods are also initially retracted0. 4pon reaching its maimum outward stroke, another double-solenoid valve shall cause the cylinder rod of another double-acting cylinder /cylinder &0 to automatically move outward to its maimum etended position. 2. 4pon reaching cylinder &s maimum outward stroke, cylinder A will automatically retract and return to its rear-end position. >ote that during the retraction of cylinder A, cylinder & remains etended. 4pon reaching cylinder As initial position, cylinder & will automatically retract and return to its rear-end position. 1. 4pon reaching cylinder &s initial position, the sequence of cylinder actions will then repeat continuously until a number of sequential movements has been completed based on a predetermined number of desired counts which will then automatically stop the sequential movements of the cylinders at &- finishing the last sequence and returning the cylinder rods in their initial positions. . >ote that the sequence of cylinder movements can also be manually stopped at any instant without regards to the counter-based process control element when another key-operated pushbutton switch is momentarily pressed.

Electro-Pneumatics Laboratory 5. %ence, $%te!-78se/ $se/-$$# se0e%e $2 A3 B3 A- B- using roller limit switches cylinder switches.

Procedure

. +ketch the pneumatic circuit diagram based on the stated problem definition. 2. +ketch the electrical circuit diagram based on the stated problem definition. 1. %ave your instructor check your circuit diagram for proper evaluation. . 6ather the required components and arranged them properly on the workstation and in accordance with the verified electro-pneumatic circuit diagram. 5. #onnect the pneumatic components with plastic tubes and accessories according to the circuit diagram. 3. #onnect the electrical components with $umper wires and accessories according to the circuit diagram. 7. (ake sure that the air service unit switch is in the off position and double check the connections of the hoses and other accessories if they are firmly coupled to the components for safe operation. 8. Turn on the pneumatic power supply /compressor0 compressed-air distributor. 9. Turn on the switch the air service unit and set the working pressure of pe=5 bar at the pressure regulator. :. Turn on the 2"#! power supply distributor. . The eperiment is started and the proper function is verified.

244

2. *eturn and arrange the components and other equipment properly upon completion of the eperiment. 1. "raw the pneumatic circuit diagram on the data sheet. +tate your observations and conclusion.


EXPERIMENT 19 DATA SHEET COUNTER-BASED PROCESS CONTROL FOR POSITION-DEPENDENT SEQUENTIAL CONTROL OF TWO DOUBLE-ACTING CYLINDER USING DOUBLE--SOLENOID VALVES Pneumatic Circuit Diagram


245

Laboratory EPN

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