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2013 International Conference on Computer Communication and Informatics ( ICCCI -2013), Jan. 04 – 06, 2013, Coimbatore, INDIA

978-1-4673-2907-1/13/$31.00 ©2013 IEEE

Simulation approach on Step Speed Control

of Induction Motor using Lab View

L.Venkatesan Dr.R.Arulmozhiyal A.D.Janarthanan

Department Of Power Electronics & Drives Department Of Power Electronics & Drives Department Of Power Electronics & DrivesSona College of Technology Sona College of Technology Sona College of Technology

salem, India salem, India salem, India

[email protected] [email protected] [email protected]

Abstract — This paper gives an overview on

Simulation approaches for the Induction

Motor using Lab VIEW. Lab View is a

Simulation software used for monitoring and

control process. Lab VIEW software's can be

used in Real Time process applications also forcontinuous monitoring. Today's Industrial

Control Applications are done by Remote

Process only. Lab VIEW Software plays

major role in Industrial Monitoring and

control systems. It is One of the most common

applications required in remote control and

monitoring. Drive control system has various

types of controller, in order to perform some

actions such as control the speed, forward and

reverse turning direction of the motor. Lab

VIEW is a human machine interfaces designsoftware that is user friendly. It can be easily

communicate with different hardware.

Keywords: Lab VIEW, Induction motor, Speed Control

I.INTRODUCTION

In the Designing field only most problemsoccurs while using more number of control

circuits. since increase in more number of control

circuits leads to increase in requirement of more

number of wirings. To reduce the usage of wiringon Hardware circuits the hardware circuit

functions can be implemented on Simulation level

using simulation software's. The hardware usagecost can be reduced by adaption simulation

controls on Industrial applications side. It is not

possible to design distance control of the systemas more hardware's and wirings were needed.

when implementing an control circuit in a

Hardware level implementation once then thesame cannot be used for long distance control. It

requires additional external circuits which willincrease the cost but implemented with the high

signal to noise ratio Due to the rise of thetechnology, Lab VIEW simulation program have

easily made the engineering design with lesser

the materials required, it is because the entiredesign is implemented in software programming

paradigm. Lab VIEW had been commonly used in

the industry, including controlling inductionmotor inverter fed variable drive system. Thus

Designing distance control machinery is now

possible, even by using Ethernet as thecommunication device between the computer and

the Induction motor[1]. The engineers can use

LabVIEW [2], which has various types of

industrial applications which are in virtualinstrument (VI) instead of the real and heavy

instrument, to control the Induction motor.

II. CONFIGURATIONS

I. Lab VIEW Lab VIEW meant for Laboratory Virtual

Instrumentation Engineering Workbench and is agraphical development environment for

generating flexible and scalable design, control,

and test applications rapidly at minimal cost.

Engineers and scientists are able to interface withreal-world signals, analyse data for meaningful

information, and share results through intuitive

displays, reports, and the Web. Lab VIEW doesn't




need any programming Experience from user endso it can be done fast and easy for all users.

The programming method used in LabVIEW is G programming, which is defined for

graphical programming. It is also known as data

flow programming as it is depending on the

structure of the graphical block diagram to execute the user-designed program. when

Comparing with text-based programming, Lab

VIEW is user friendly as the user can design the program by simply arrange and wiring the

relevant icons together. Lab VIEW programs are

also named as virtual instruments, or VI, becausetheir appearance and operation mimic the physical

instruments, such as oscilloscope and multi-

meters.Lab VIEW also has an extensive library of

math functions similar to MATLAB libraries andalso formula nodes that allow text-based

programming for certain sections of the code thatrequire complex logical structures. Like other

conventional programming, Lab VIEW has

standard features such as looping structures, datastructures, event handling, object-oriented

programming. Lab VIEW has front-end interface

applications that allow user to design and then usefor controlling systems. In general Lab VIEW has

three main elements: the front panel, the block

diagram and the connector panel. The front panelallows the user to build the controls and

indicators.

Figure 1. Three main elements of Lab VIEW software.

The controls are including Cons, push buttons,dials, and other input mechanism. Indicators are

graphs, LEDs, and other output displays.Meanwhile, the block diagram let user to add code

using VIs and structures to control the front panel

objects. The connector panel allows user to

represent a single VI as a sub VI icon that can becalled in another VI.

The elements are illustrated in Figure 1.

II. Levels of Lab View Simulation

1. Virtual Implementation Process The objective in this paper is to control

Induction motor using Lab View simulation

Software. To achieve this objectives, the

establishment of the communication Lab VIEWand Induction motor has to be done and it should

be verified. The implementation used in this Lab

VIEW to perform the start and stop operation ofthe motor, either in forward or reverse direction,

and varying the speed by changing the frequency

of the motor. Since system is not an SCADA based control so there is no practical data

measurement acquire from the actual output of the

motor.




The system has three-layer network architecture

illustrated in Figure 2.

Figure 2 Three-Layer Network Architecture

2. Implementation of VI Design

The objective of the VI program in this paper

is to allow user to make the decision of the startand stop operation of the motor, either in forward

or reverse direction, and varying the speed by

changing the frequency of the motor, by perform two simple step. This process isimplemented in VI's by using some Logics

applied. very first step in this simulation is to

Press the power Button to Upward Direction toswitch on Control circuit and select the Motor

turning direction by pressing the selector switch to

select Forward/Reverse Direction in the VI Front

Panel. Secondly, vary the speed by turning theFrequency knob to the value of the frequency that

the user desire. Figure 3 shows the VI Front

Panel.we have created 5 tags and used in the

implementation, and the details of the tags have

been tabulated in Table 1.By referring to Figure 3, when the Grey

push Forward button is the switch to determine

the motor is turning in forward direction.Meanwhile, the Grey Black push button is the

switch to determine the motor is turning in reversedirection. Both Forward and Reverse light

indicators at the right hand side show whether the push buttons have been switched ON. The knob

labelled as “Frequency” is the key program to

control the frequency as well as the speed of themotor. The push button labelled as “Stop”

function to stop the program execution.

Figure 4 describes about the VI BlockDiagram, which the programming part of the VI.

By referring to the Figure 4, the following VIcomponents that are visible in both Front

Panel and Block Diagram. For Example the push buttons, knob, light indicator. But the Red colour

square boxes without dotted lines are the VI

component that is visible in Block Diagram but

they are not visible in Front Panel, which areessential VI to structure the program. For

example, Logics used with in Case Structure and

the While loop. The While loop, which is similarconcept with the While loop in C Programming, is

used in this VI to ensure the program execute

continuously until the stop button is triggered.The VI block diagram consists of two parts

of the program. First part of the program is to

allow user to switch on either Forward or Reversedirection of the squirrel cage induction motor. The

second part of the program is to vary thefrequency of the motor by changing the

Frequency knob value.

Table 1

THE DETAILS OF TAGS AND ITS CONNECTION TO INVERTER.

TAG NAME CONNECTED

TERMINAL

TERMINAL NAME

OUTPUT

BIT 1S1

Multi Function

input1

(Forward/Stop)

OUTPUT

BIT 2S2

Multi Function

Input2

(Reverse/Stop)

OUTPUT

BIT 5S5

Multi Function

Input5

(Multispeed reference 1)

OUTPUT BIT 6

S6

Multi Function

Input5


OUTPUT

BIT 7S7

Multi Function

Input5


By referring to Figure 3, if the user has switchedon the Forward button, the signal will be

transmitted to the “outputbit1, i.e. the signal will

be Generated from the Reference Frequency.




Then once the signal has been successfullytriggers the light indicator of the output address,

and the “Forward” direction indicator in the

LabVIEW’s Front Panel will light. The same

process is identical to the reverse direction aswell.

Figure 3. VI front panel of the project.

By referring to the Figure 4, the square boxes

indicate the Frequency calculations. After the user

set the value of the frequency by turning the“Frequency Variable” knob, the value will be sent

to the Case Structure where Logics used. Theoutput of the Case structure has been divided into

Multispeed Reference 1,2,and 3, in which the

number is either 0 or 1.Table 2 below describes the relationship

between the multi-step speed references 1 through

3 and frequency references 1 through 8.The value

of each frequency reference can be set in the

function parameters of the variable frequency

drive. In this paper, the value of each frequencyreference has been tabulated in Table 3.

Figure 4. VI Block Diagram of the project.

Figure 5. VI block diagram program (motor orientation

switching part).






3. Testing and Verification

Testing the created Simulation is the final

stage of this project. We have tested the

simulation by step by step process in bothForward and in Reverse Directions. We found

good results from this simulation. Thus SpeedControl on Induction Motor has been

implemented with the Lab VIEW Software.

III. CONCLUSIONS Thus we came to conclude, that from this

the objective, scope and fundamental

requirements of the project had been achieved.

Every decision made by the user is done throughLab VIEW Simulation only. There is limitation

in the speed control as there are only 3 multi-

step references in the VFD. The frequencychanges in this project cannot perform in smallersteps unless there are additional multi-step

references provided.

In overall, choosing Lab VIEW as the humanmachine interface for the implementation is a

proper decision as it has various types of

applications and functions that are easy to

understand and use. Additionally, this approachis more economical as the objectives of the

system implementation have been achieved with

only basic functionality of the Lab VIEWtoolkits used.

References

[1] W.-F. Chang, Y.-C. Wu and C.-W. Chiu,

“Design and Implementation of a Web-

Based Distance PLC Laboratory,”

Proceedings of the 35th Southeastern

Symposium on System Theory, Morgantown,16-18 March 2003, pp.326-329.

doi:10.1109/SSST.2003.1194584

[2] M. Rodrigues, J. Mendes and J. Fonseca,

“Application of a Web-Based Monitoringand Control System in Plastic Rotational

Moulding Machine,” IEEE International

Conference on Industrial Technology,Hammamet, 8-10 December 2004,

pp.819-823

[3] N. N. Barsoum and J. A. Roland, “Ethernet

Lab VIEW Control,” Undergraduate Thesis,Curtin University Sarawak Campus, Sarawak,

2010.

[4] National Instruments, “Getting Started with

Lab VIEW,” National Instruments, TechniqueReport 373427F-01, 2009.

[5] National Instruments, “Using the Lab VIEWShared Variable,”2010.http://zone.ni.com/dev

zone /cda/ tut/p/id/4679

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