Global Strategy and operations Paper Essay Example | Topics and Well Written Essays - 750 words

Global Strategy and operations Paper - Essay Example The assumption that budget considerations have already been considered will be emphasized and adapting the tools necessary for business success will be achieved with theoretically approved business dollars. Creating a new business venture is a difficult operation when taking into account the multiple variables to achieve a successful launch. Even more complex is the operations planning involved in creating a business division constructed overseas. Cultural considerations of the indigenous population where the business will be centered must be taken into consideration, as well as any ethical expectations of how the company should perform its transactions. Adopting appropriate Information Technology and research and development (R & D) lies in understanding how the overseas entity will function in its production, distribution, and in generating innovative products. The first step in the successful launch of Global Beauty Cosmetic Center (GBCC), the business entity being launched in Costa Rica, is to understand the methods in communicating with its partner in the United States. Interoffice memorandum, as distributed via postal services, would certainly be an inefficient method to conduct internal business. From an operations perspective, adopting an effective e-mail/communications system would be an integral component in shortening response time between divisions. Implementation of such a system is a relatively simple process, as well-established technologies exist for these purposes. The business will rely on delivering a team of IT professionals to Costa Rica to generate this system, and all other IT needs, and report back to headquarters of its test and successful incorporation. Achieving successful inputs will be crucial to the success of Global Beauty Cosmetic Center. Inputs consist of the supplies needed to create the beauty products, including raw materials, labor issues (payroll), and facilities management (Gomez-Mejia, et al 2005).

Equipment & Systems Engineering Essay Example for Free

Equipment Systems Engineering Essay Product overview CATIA Plant Layout 1 (PLO) enables organizations to optimize their manufacturing plant layout. This product is one piece of Dassaults integrated Digital Manufacturing Solutions. It deals specifically with the spatial organization and components of the plant, allowing quick easy layout and downstream evolution of the layout design. Through the CATIA V5 integrated product environment, users have a seamless solution to address all their manufacturing environment needs. They have the tools necessary to optimize production facility layout, leading to optimized factory production and output. CATIA Plant Layout 1 (PLO) provides an accessible solution for departments of small and medium enterprises. Its friendliness, intuitiveness, and ease of use makes it possible for inexperienced users to use the system with a minimal cost of implementation. The complete layout of the facility can be driven almost completely with the mouse and the product has a user interface that helps users make the transition from traditional 2D layout to 3D. With the intelligence behind the V5 Plant Layout model, plant designers and systems layout design teams can identify and solve problems with the layout or production process long before equipment is installed or moved inside the plant. The software enables users to not only complete designs faster, but also to significantly improve the quality of their designs. Today, every manufacturing company is looking for new methods to reduce the time it takes to ramp-up, reduce the number of problems on the production floor including downtime, and get products to market faster. Dassaults Digital Manufacturing Solutions, which include the CATIA Plant Layout 1 (PLO) product line, assist companies in achieving these objectives. CATIA Plant Layout 1 (PLO) , together with Dassault Data Management offerings, gives users the power to manage their plant layouts and associated components from initial design to plant operations, in a way that is easily adapted to how the customer works. Product Highlights Includes an optimized user interface for easy maneuverability and layout design iteration Provides an easy tool to define pathway route for preliminary space claim. Provides optimized tools for quick and easy layout of complex configurations.

Commercialization And Profit Making Incentive In Healthcare Economics Essay

Commercialization And Profit Making Incentive In Healthcare Economics Essay Commercialization and the profit making motive in healthcare has been an issue for heated debate in recent times. Should the healthcare industry be regarded as a for profit enterprise or retain the philosophical approach intended which should be to treat sick patients at the barest minimum available price? I will with this essay present an argument against commercialization or a profit making incentive by looking at it from the perspective of the physician, the economy, the patient and all other stakeholders in the sector. As far back as ancient China, a member of a family was expected to be proficient in the art of medicine in other to meet the health demands of his kin. This has eventually evolved into receiving a financial reward for this expertise and hence the emergence of the medical profession as we have known it to be. A doctor sees a patient and receives a fee for treatment offered. This is in itself not a bad thing as quite agreeably, a service has been offered and like most services, should involve remuneration. Only problem with this is that unlike most other types of services, healthcare is quite a peculiar form of service as it doesnt follow the normal laws of economics. For example, a hotelier can decide not to accommodate an individual without the financial capacity to pay for a room but it screams out against all the medical profession has stood for in all these years to turn an individual (who for the sake of strengthening this argument, needs a minimal intervention to prevent a life threatening catastrophe) without the financial capacity away from the hospital. Needless it is to mention that the medical profession is one that has been governed by ethics and rules, the very foundations that make the profession a noble one. A profit making motive serves to do a whole lot more damage than good. Basic definitions Before resuming this essay, it will be important to understand the basic definitions of to concepts which will be the sole foundations of this argument. Profession: As Hodson and Sullivan explain, a profession is a knowledge-based occupation with high status that has four principal characteristics: specialized knowledge, autonomy, and authority over other subordinate occupational groups, and a degree of altruism (Hodson and Sullivan, 2002). These four characteristics can be said to serve as the basic ideologies which define a profession. Commercialized healthcare: Provision of healthcare services through market relationships to those who can afford it; investments in and production of services and of inputs to them, for cash income to profit, including private contracting and supply to publicly financed health services; and healthcare finance by individual payment and private insurance. (UNRISD, 2005) COMMERCIALIZATION AND THE PATIENT It has been effectively argued that putting a price on health will reduce number of patients who seek unnecessary procedures or surgeries such as in the case of cosmetic surgery, or even more positively make people more health conscious for example people will avoid being morbidly obese as they know that the cost of a gastric by-pass surgery will be overwhelming, and will do all they can to get into shape, eat healthier and live a relatively healthier life than if it wasnt expensive. However, the relationship between a physician and the patient is one of trust, where the patient subjects him/herself to the judgement of the physician, judging that the physicians decision about his/her health will be solely guided by the patients best interest at heart, a vulnerable position, very open to abuse and can encourage to promote profit producing drugs, unnecessary surgeries, tests and treatment. In this situation, the possibilities for manipulation and abuse of the trust are limitless. Studies have shown reduced trustworthiness amongst for-profit institutions (Schlesinger et al., 2005). There have been cases heard of doctors keeping patients on dialysis earlier than they should be so that more money can be made, or refusing/not suggesting a kidney transplant which can stop the dialysis altogether. In particular, the relationship between the provider and consumer in this case cannot be compared to what gives under normal economic market forces. This is because the healthc are consumer is not sovereign and lacks the medical know about their condition and what they exactly require. Besides the sick or frightened patients do not regard their physicians as they would normal purveyors of goods and services nor do they regard the hospital as a department store. This is all without mentioning the economic impact it will have on the patient, who might be made to pay for what is relatively cheaper, or even totally unnecessary and that might not be beneficial to the patients health at all. In a for-profit enterprise, treatments and procedures lacking an opening for profit, however effective and cost saving will be disregarded to make way for newer and sometimes even unreliable but far more profitable procedures and treatment. One of the most pressing issues in this is the health inequality gap this creates especially amongst socio-economic groups. Richer individuals who are able to afford the large sums required for their treatment will ultimately survive longer than those who are less privileged. Even the UK health system, which commenced a comprehensive free healthcare system by the mid twentieth century funded by tax revenue, still faces issues with health inequality, how much more a system where healthcare is out of pocket service and with the possibility of profit making motive. COMMERCIALIZATION AND THE DOCTOR The medical doctor is one who has gone through gruelling training to acquire medical skill a supporter of commercialization can easily argue. The cost of training a doctor varies in different countries but arguably tops the list in these countries nonetheless as the training takes longer than a regular undergraduate programme, and of all professions, it is the one that requires constant reading and updating, after all, we are dealing with human lives here. And so, it has been said that well paid professionals, who have no need to worry about their daily needs, and/or catering for their families tend to be the most effective. It is argued that they will be able to concentrate on their jobs fully and perform most efficiently. While comfort cannot be ignored as comfort brings happiness and happiness leads to efficiency, this has never been the backbone of the medical profession. I believe the healthcare provider should be adequately compensated, but not like businessmen, or else the consumer will be perceived as a commodity and no longer as a sick patient in need. For example a healthcare deliverer who is driven for profit, will be biased in the provision of his services, where he/she will have more zeal and attention to a profitable case than he would in a non-profitable one. The physicians oath, which with its third line declares that I will practise my profession with conscience and dignity; the health of my patient will be my first consideration, must always be at the back of his/her mind. Commercialization will lead to leaving certain values and morals that are necessary to a community, such as caring, compassion, charity. The idea of altruism should be perpetuated by all healthcare providers and their primary concern has to be the alleviation of human suffering and the restoration of health. Society must not allow such important and fragile virtues to be extinguished by the self-interest that drives for-profit enterprise. Furthermore, as a marketing scheme, multinational drug companies spend more and more on education in medical schools, and also on doctors with the aim of eventually influencing the physicians decision making, tilting to favour the companies sometimes at the expense of the patient. COMMERCIALIZATION AND THE ECONOMY Health is one of the main priorities of a country and the provision of affordable healthcare and a good welfare system should not be a privilege to any member of a large society. Unfortunately, this will not be seen in a profit oriented health setting. Solicitors of for-profit health institutions will argue that with the advent of managed care, less and less will be spent on healthcare. This is by introducing policies of insurance into healthcare because the more people subscribed to the system, the cost for healthcare will be spread over all of them. Physicians under this programme will be advised to use less expensive treatment and sometimes at the expense of the patient. The cost to the workforce of sick patients who are unable to carry out normal daily activities will be very obvious. Also, when the financially capable are the ones who are more likely to get medical attention and the ones who cannot are left out to dry, it further increases the upper-lower class margin creating a terrible inequality that should not be accepted. COMMERCIALIZATION OF HEALTH AND OTHER STAKEHOLDERS One of the major driving forces of commercialization of healthcare is the introduction of investor owned institutions. Now everybody wants a dip of this now largely rewarding enterprise ranging from bankers to insurance managers, stockbrokers, economists and so on. This has only done nothing but to undermine the authority of the health care provider as he/she is now subject to higher authority; the authority of investors. This will not allow him/her make the best decisions in favour of the patient as his decisions will become profit oriented. There is also the issue of unfair competition for non profit health institutions. When for profit institutions agree to take only the wealthier clients and those who are able to pay, this indirectly shifts all those who are unable to pay to the non profit health care providers causing an undue and unfair burden on them. In some cases it can also turn non-profit institutions into for profit ones, and cycle continues gradually phasing the non-profit institutions out of existence. The medical establishment works closely with the drug multinationals whose main objective is profits, and whose worst nightmare would be an epidemic of good health. Lots of drugs must be sold. In order to achieve this, anything goes: lies, fraud, and kickbacks. Doctors are the principal salespeople of the drug companies. They are rewarded with research grants, gifts, and lavish perks. The principal buyers are the public from infants to the elderly who must be thoroughly medicated and vaccinatedat any cost! Why do the authorities forbid alternative medicine? Because they are serving the industry, and the industry cannot make money with herbs, vitamins, and homeopathy. They cannot patent natural remedies. That is why they push synthetics. They control medicine, and that is why they are able to tell medical schools what they can and cannot teach. They have their own sets of laws, and they force people into them. The healthcare industry has become so reliant on the big multinational co mpanies that these funders exert authority over the healthcare providers, and cause them to violate precepts of medical ethics (Grouse, 2008). Misplaced attention driven by profit making incentive is another issue. Multinational pharmaceutical companies focus their research and development on high profile, profit-making drugs like Viagra instead of developing cures for life threatening diseases in poorer countries.   COMPARISON OF THE UNITED KINGDOM AND THE UNITED STATES HEALTHCARE SYSTEMS The UK as earlier mentioned started a comprehensive free medical coverage for its citizens by 1948. The system is sponsored by tax revenue from its citizens. And as such, healthcare is fully monitored by the government through one body; the NHS which is Englands public health service provider, leading to the provision of free healthcare to its citizens. There are private health institutions for those who will want to pay for services but this is said to be patronized by just about 8% of the total population. Some of the disadvantages of this healthcare system are longer waiting lists as everyone has equal access to healthcare, questionable quality of service as the healthcare providers might sometimes forget that the patient has paid for the service required already through taxes. However, this system has the advantage of free healthcare and nothing beats that. The United State in comparison is largely owned and operated by the private sector. Healthcare insurance is provided largely by the private sector as well except for some health programmes such as the medicare, Medicaid, tricare, the childrens health insurance programme and the veterans health administration which in all are unable to cater for an appreciable percentage of the total population. This kind of healthcare system that is largely dominated by the private sector allows for the profit making incentive to be a common trend. Both systems their strengths and weaknesses Commercialisation of healthcare is something that has been thoroughly scorned on by members of the profession itself. Various medical associations have risen up to fight this threat to the profession. CONCLUSION It is true that a lot of investment goes into the training of a doctor or any healthcare specialist at that and that they need to be well remunerated for their services, however this should not be a primary focus of the service provider because as this essay has shown, the health market differs from all other markets and that the patient doctor relationship is one built solely on trust; trust that the right, best intervention is given to the patient. Perhaps most importantly, professionals must have an ideology that assigns a higher priority to doing useful and needed work than to economic rewards, an ideology that focuses more on the quality and social benefits of work than its profitability. This ideology is one that should be preserved for the sake of the profession. The younger generation of health care providers should also be considered so nobody should go into this profession with the aim of amassing wealth, so that the altruistic nature of the profession, which stands as one of its core values, will be preserved. Healthcare is a right and not a privilege and it goes without saying that every society is morally obliged to provide healthcare to its members. An increase in for-profit health care provision however, will only exacerbate the growing problem of accessibility to healthcare.

Operating System Used In Portable Devices Computer Science Essay

Operating System Used In Portable Devices Computer Science Essay This report is about Operating system used in portable devices like PDA and laptops etc. As the passage of time consumer needs are becoming more and more demanding and life is becoming compact so as devices are also becoming more powerful and their OS also more advanced and complicated we will discuss some those most commonly used OS and their different uses and the devices they are used produced by different manufacturers and a brief introduction to OS and its types. Operating system is the most important program which enables hardware to communicate with each other and humans also. Every program needs an operating system to run on computers or handheld devices. It is responsible of managing inputs given by user and transferring them into desired outputs by using devices like keyboard, mouse, printers and monitors etc. attached to motherboard. OS usually exists in hard drives of computers or in handheld devices in flash rom memory. OS also arrange, manage organize all file and folders on computers. The more systems are larger the more complex the process in those system becomes so the OS used in these systems are more powerful and the task they perform are also exponential. They are capable of doing many tasks simultaneously without interference of each other and providing expected performance at the same time. Different type of OS available for desktop or laptops are Windows which is dos based and Mac OS which is Unix based, Ubuntu which is Linux based etc. and for handheld there are many choices as well like Symbian OS, Android, Windows mobile and apple iOS etc. Operating system can be mainly of four types based on their use and support. They are as follows: Real time OS This OS is developed for devices which have limited memory and to make them efficient and fast less coding is used as resources are crucial and execution time needs to be minimal. Example is Windows CE. Single user single Task It is a advanced version of previously mentioned Real time OS. In this type one user can perform one task at one time. The palm top or PDA fits in this type. Example is Window mobile. Single user multi Task This is the most commonly used OS type nowadays. These OS are capable of Multitasking and capable of performing all user tasks as multimedia, internet ,games and all commonly used tasks Example of this type could be Window 7 ,Mac OS etc. Multi User These are the most powerful OS of all. They are capable of handling many users at same time and providing all of them with the resources they need. These OS are not like single user multi task where only one user can perform task at a particular time in this type many user can login at same time. Example is UNIX, Linux etc. Literature Review The increasing demand of handheld or portable devices created a new era in computing history as from year 2000 and onwards the approach of people regarding mobile devices changed and life started becoming fast and compact day by day so the need of business and entertainment devices and so the mobile OS started become popular and lots of computer hobbyist and developers started developing faster and efficient mobile OS and its applications. The use of internet, emails and messaging started becoming popular in devices and these facilities started becoming a part of handheld devices and some of those are discussed below. 1) PDA PDA stands for Personal Digital Equipment usually called pocket pcs or pocket computers it is an handheld device which has functionalities like phone, internet, multimedia etc. all in pocket able size. User interact with these through a stick called stylus or nowadays mostly fingers some of these also have built in QWERTY keyboards for quick and better input. PDA also have features like hand recognition, voice recognition and gesture response. 1.1) Types of PDA Some types of PDS available are as follows: 1.1.1) Palm It is kind of PDA which runs its own OS called Palm OS example could be Palm TX, Palm Pilot etc. Palm became a very renowned name in portable computing industry. It played a major role in the development of PDAs it introduced a variety of different versions of devices in market. Palm OS can also be found in Sony Clie, Handspring Visor and Tapwave Zodiac. 1.1.2) Pocket PCs These kinds of PDA are usually based on Microsoft Windows Mobile OS which uses Windows CE core. They are capable of all sorts of functionalities like video and music playback, Web browsing through built in internet explorer, fax sending, and email etc. There are many manufacturers of pocket pcs in market some of which are HP, HTC, Motorola, Dell etc. 2) Laptops These are smaller, lighter and in most cases equally powerful in performance computers compared to desktops. They are meant to do computing on the move. laptops got large capacity ,more memory and better processors as compared to other mobile computing devices. They run Windows Xp, Vista or 7, Mac OS and Ubuntu etc. 2.1) Netbooks These are a newer kind of laptops which are much smaller in size as well as computation. They include all components as normal laptops but in scaled down version there size is normally of a A4 size page and qwerty keyboard with a bit less keys then normal laptops. They are capable of performing normal day to day task as surfing web, using word watching HD YouTube widows (newer versions only).There battery life vary from 8 to 9 hrs. That is 4 to 5 times more than standard size laptops. Mostly Ubuntu, Android, Windows XP and Windows 7 starter are used as OS in netbooks. 3) Other Mobile OS We have discussed Palm OS and Windows Mobile but there are very well known OS which are as follows: 3.1) Symbian OS This OS is the most renowned in the industry and more than 85 percent of mobiles manufacturer use this as standard in their devices and lots of developers had become interested in developing their applications which totally changes the user experience of Symbian running devices. Symbian has released different versions of its OS like Symbian series 20 or 30 for low end handsets, Symbian series 40 and 60 for mid-range and series 90 for high end business communicators and uses 2.5G and 3G. 3.2) Android This is the one of the most promising and trusted OS compared to others. It is verily used in devices like 3G internet tablets ,mobile phones and recently released a 4G version of their android also installed in HTC EVO 4G. It is mainly based on Linux kernels so the development is quite easier and lots of applications are already in market for this OS. 3.3) iOS It is created and developed by apple Inc. It was knows as iPhone OS before it uses apple OS X also UNIX like OS. The new version iOS 4 is a hybrid system and it uses kernel type from Darwin foundation uses 4 abstraction layers. It also supports multitasking and features like video calling, VoIP (Voice over internet protocol), background music playback etc. Conclusion Operating System of devices like PDA and Laptops solves many user problems as the passage of time these mobile devices are more and more compact and high performance so their OS is also becoming more and more complex to develop. As we can see from this research that plenty of mobile devices companies are paying more attention to their OS because if its poorly designed whole device no matter how best the hardware is will change whole user view about device. If the device is losing its internet connection every second or hanging or giving unexpected errors means its OS is not properly developed and tested after implementation on device under different scenarios and environment. The best examples of well-designed OS in mobile industry are Android, iOs, Symbian etc. as mentioned in this report. Laptops on the other hand can run any desktop version OS according to their hardware capabilities and netbooks usually use lighter version of these OS as we have seen in this report.

Comparison of Electoral Politics :: essays research papers

Comparing the electoral politics of most Western and Eastern European countries is like comparing night and day. While most of Western European countries have a strong political system, thriving economy, and a developed government†¦most Eastern European countries have just started this idea of a democratic nation. Most governments are corrupt and the political officials are not very trustworthy. The economy is also struggling and there is unrest with the people. This transition from communism is giving Eastern Europe a lot of problems. This is the case when comparing the Republic of Ireland and the Republic of Albania. Republic of Ireland The Republic of Ireland has been recognized as an independent state since 1921 resulting from a powerful revolutionary movement led by the Sinn Fein (â€Å"Ourselves Alone†), currently the political arm of the Provisional Irish Republican Army. Once very influential in the Irish government the original Sinn Fein was formed in 1905 to promote Irish independence and led the movement that helped produce a free Irish State. Presently their political aim remains unchanged-â€Å"the right of the Irish people as a whole to attain national self-determination†(Local Ireland). Wanting to achieve a United Ireland ‘by whatever means necessary’ (Local Ireland). Government The Irish government is a parliamentary system with a bicameral legislature. The Executive branch consists of The chief of state, President Mary McAleese (Fianna Fail) was elected in 1997 to a seven year term and is basically a figure-head with no executive powers. The Head of the Government is the Prime Minister Bertie Ahern (Fianna Fail) nominated by the House of Representatives and appointed by the president. The president appoints the Cabinet with previous nomination by the Prime Minister and approval of the House of Representatives. In elections the president is elected by popular vote. The president also appoints the Supreme Court judges on the advice of the government. The Irish Parliament (Oireachtas) consists of the Senate (Seanad Eireann) and the House of Representatives (Dail Eireann). The Senate consists of 60 seats, 49 elected by the universities and from candidates put forward by five vocational panels, while the other 11 are nominated by the Prime Minister, Bertie Ahern. The members serve five-year terms. The House of Representatives has 166 seats elected by direct popular vote and in most counties a proportional representation system calls the single transferable vote system (STV) is used. This complicated system is very rare and is only used in the small Mediterrianian Island of Malta.

Corporate Governance Essay examples -- Business Management Essays

Corporate Governance Corporate Governance is the relationship between the shareholders, directors, and management of a company, as defined by the corporate character, bylaws, formal policies and rule laws. The corporate governance system was designed to help oversee the decisions and best interest of the shareholders. The system should works accordingly: The shareholders elect directors, who in turn hire management to make the daily executive decisions on the owner’s behalf. The company’s board of director’s position is to oversee management and ensure that the shareholders interest is being served. Corporate governance focus is with promoting enterprise, to improve efficiency, and to address disputes of interest which can force upon burdens on the business. Ensuring that the clearness, and truth in a company’s business can make contribution to improving the enterprise standards and public governance. What created corporate governance is still a question of debate? It is a developing order control system, and one in which little has been rearranged from the outlook of developing and transition economies. From the corporation’s outlook, the developing system’s general agreement is that the purpose of corporate governance is to increase the firm’s value, subject to meeting the corporation’s financial and other legal obligation. They believe that the extensive meaning stresses the need for boards of directors to balance the interest of capital providers with those of stakeholders in order to achieve long term maintained commercial success. While on the other hand, the public believe the purpose of corporate governance is to nature the spirit of the company while ensuring accountability for the exercise of power and special privileges by the firm. The role of the public policy is to provide firms with the incentives and discipline to minimize the difference between private and social returns, and to protect the interest of stakeholders. Corporate governance has become an issue of worldwide importance. Corporations have a role to play in promoting economic development and social progress therefore they must have the best members on the board to assure good standards. Board members and directors should possess certain characteristics that will allow them to make good decisions for the firm. The appropriate characteristics should be possessed by each c... ...lling away from the company. This new Nasdaq rule is suppose to make investors and the public aware of what is happening with the company weather its conflict of interest or other corporate abuse. They also believe it will give investors more confidence in the companies that they invest their money in. The new rule should prevent a bad company from showing dishonest behavior. Many agree that there will not really be a change for companies that are doing business correctly already. All it really will do is show the public who the bad companies are and see them as they are put to justice. The bottom line to the whole scenario is â€Å"all honest people are honest people and crooks are crooks†. It has been said that this new rule will only make the bad people work harder to be bad and continue wrongful doings to learn new ways to bet the corporate governance system. Face it the bottom line is if you want something done right you have to do it yourself, but how could one person have some many obligations to meet for a company when they will face problems also. Hopefully along with the new Nasdaq rule and obedience board directors corporate governance will become better with in time.

Plc Programmable Logic Controller

AUTOMATIC CONTROL OF HYDRAULIC SYSTEM USING PLC * Company Products & Services * Abstract * Hydraulic System * Bow Compression Machine * Circuit Diagram * Description * Chiller Unit * Solenoid valve * Introduction To PLC * Software * Advantages Of PLC * Introduction To PLC * Existing System * Proposed System * Ladder Logic Diagram * Ladder Logic Description * Energy Saving Calculation * For Existing Method * For Proposed Method * Advantages & Applications * Conclusion * References ABSTRACT :One of the challenging factor in factories, for the proper functioning of the machine for the long duration with efficiency is to keep certain parameters within a specific range. Thus, in this paper, we have designed a ladder diagram for running PLC with the objective to automatically control the hydraulic system. Our main requirement is to design a PLC which can be connected to hydraulic system to implement the parameters and operations like Temperature detection, Pressure detection, Lubrication, Automatic machine operation and Oil level detection.The mentioned parameters and operations can be sensed and operated through PLC without any manual checking and operation. This saves more power to industries by reducing the power consumption. INTRODUCTION In the last decades, the machines used in the industries were operated manually. So keeping its certain important parameters in a specific range was difficult. Also they can not be checked out frequently. This results in improper functioning of the machine. Also, the machines cannot work efficiently for a long time.For example, if the temperature of the oil goes beyond the desired value it will affect the machine function. Hence the machine accessories cannot withstand this high temperature. This leads to the damage in machine and the durability of the machine also gets reduced. Thus, the working machine requires frequent checking of certain parameters to maintain the value within the specified range for proper operation. The var ious parameters to be checked frequently are: 1. Temperature detection 2. Lubrication 3. Automatic machine operation 4. Oil level detection . Pressure Thus we are using a PLC to control all these parameters. We are designing a ladder diagram to control all the parameters automatically. In this paper, we are describing about the hydraulic drive system in which PLC is used to control its working. An introduction of PLC is provided and also the ladder diagram overview. We will be discussing about the advantages of PLC and also the power saving estimation in the industries by using PLC. The machine which we have taken under consideration for implementation is BOW CORRECTION MACHINE.Also, the chiller unit is described as it plays a major role for the power saving purpose. HYDRAULIC DRIVE SYSTEM : A  hydraulic drive system  is a drive or  transmission  system that uses pressurized  hydraulic fluid  to drive  hydraulic machinery. The term hydrostatic refers to the transfer of energy from flow and pressure, not from the  kinetic energy  of the flow. Principle of a hydraulic drive Pascal's law  is the basis of hydraulic drive systems. As the pressure in the system is the same, the force that the fluid gives to the surroundings is therefore equal to pressure ? rea. In such a way, a small piston feels a small force and a large piston feels a large force. For an understanding of how a hydraulic system works, we must know the basic principles, or laws, of hydraulics, that is, of confined liquids under pressure. This will be made easier, however, if we first examine the somewhat simpler laws governing the behavior of liquids when  unconfined, that is, in open containers. 1. Liquids in open containers. a. Density and specific gravity. The first characteristic of an unconfined liquid which interests us is its density.The density of a fluid is the  weight of a unit volume of it. The unit of volume normally used in this text is the cubic foot; the unit o f weight normally used is the pound. The standard of density, to which the densities of all other liquids are referred, is that of pure water at zero degrees centigrade (32 degrees Fahrenheit), and at sea-level atmospheric pressure. b. Force and pressure. A liquid has no shape of its own. It acquires the shape of its container up to the level to which it fills the container. However, we know that liquids have weight.This weight exerts a force upon all sides of the container, and this force can be measured. Therefore, for unconfined liquids, that is, liquids in open containers, the pressure in pounds per square inch exerted by the liquid on the bottom of the container is equal to the weight of the liquid on each square inch of the bottom of the container. It must be emphasized that the  weight  of the liquid is here thought of as a  forceexerted on the bottom of the container. Expressed as a formula, we have: Pressure = Force per unit areaIt is understood that the word pressure , when not otherwise qualified, means  pressure in pounds per square inch. This is called the total force and is obtained by the formula: Total Force = Pressure X Area The pressure exerted by a liquid on the bottom of a container is independent of the shape of the container, and depends only on the height and density of the liquid. 2. Liquids in enclosed systems. a. Liquids are practically incompressible. The following two basic principles will help to explain the behavior of liquids when enclosed: a) Liquids are practically incompressible. ) The applied pressure is transmitted equally in all directions at once. b. Increase of force with area. The ratio between the  force applied to the smaller piston  and the  force applied to the larger piston  is the same as the ratio between the  area of the smaller pistonand the  area of the larger piston. Expressed as a proportion, then, we have: Force on larger piston/Force on smaller piston = Area of larger piston/Area of small er piston This means that the mechanical advantage obtainable by such an arrangement is equal to the ratio between the areas of the two pistons.Since the area of the larger cylinder is 10 times as great as that of the smaller cylinder, pushing the smaller piston downward a distance of 1 inch will move the larger piston upward only 1/10 of an inch. The ratio between the displacement of liquid in the smaller cylinder and the displacement of liquid in the larger cylinder is once again equal to the ratio between their areas. so that the amount of work (force X distance) done by the larger piston is exactly the same as the amount done by the smaller piston. c. Multiple units.It is not necessary to confine our system to a single line from the source of hydraulic power. Hydraulic power may be transmitted in many directions to do multiple jobs. PUMP – In practice we usually need some device which will deliver, over a period of time, a definite volume of fluid at the required pressure , and which will continue to deliver it as long as we desire it to do so. Such a device is called a  pump. Basic principles of pumps. A hydraulic pump is a mechanical device which forcibly moves, or displaces, fluids.Various pumping principles are employed in the different types of hydraulic pumps, but one fundamental principle applies to all: a volume of fluid entering the intake opening, or port, is moved by mechanical action and forced out the discharge port. Hydraulic fluids. Almost any free-flowing liquid is suitable as a hydraulic fluid, as long as it will not chemically injure the hydraulic equipment. For example, an acid, although free-flowing, would obviously be unsuitable because it would corrode the metallic parts of the system. a. Basic units of a hydraulic system. 1.A reservoir, or supply tank, containing oil which is supplied to the system as needed and into which the oil from the return line flows. 2. A pump, which supplies the necessary working pressure. 3. A hydra ulic cylinder, or actuating cylinder, which uses the hydraulic energy developed in the pump to move the door. 4. A cut-out valve, by means of which the pressure in the actuating cylinder may be maintained or released as desired. 5. A check valve, placed in the return line to permit fluid to move in only one direction. 6. â€Å"Hydraulic lines,† such as piping or hose, to connect the units to each other.The supply tank must have a capacity large enough to keep the entire system filled with oil and furnish additional oil to make good the inevitable losses from leakage. The tank is vented to the atmosphere; thus atmospheric pressure (14. 7 pounds per square inch) forces the oil into the inlet, or suction, side of the pump. The tank is generally placed at a higher level than the other units in the system, so that gravity assists in feeding oil into other units. The pump is the hand-operated, reciprocating piston type. SOLENOID VALVE : A  solenoid valve  is an  electromechan ically  operated  valve.The valve is controlled by an  electric current  through asolenoid: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports. Multiple solenoid valves can be placed together on a  manifold. Solenoid valves are the most frequently used control elements in  fluidics. Their tasks are to shut off, release, dose, distribute or mix fluids. They are found in many application areas. Solenoids offer fast and safe switching, high reliability, long service life, good medium compatibility of the materials used, low control power and compact design.There are many valve design variations. Ordinary valve can have many ports and fluid paths. A 2-way valve, for example, has 2 ports; if the valve is  closed, then the two ports are connected and fluid may flow between the ports; if the valve is  open, then ports are isolated. If the valve is open when the solenoid is n ot energized, then the valve is termed  normally open  (N. O. ). Similarly, if the valve is closed when the solenoid is not energized, then the valve is termednormally closed. [1]  There are also 3-way and more complicated designs.A 3-way valve has 3 ports; it connects one port to either of the two other ports (typically a supply port and an exhaust port). Solenoid valve are also characterized by how they operate. A small solenoid can generate a limited force. If that force is sufficient to open and close the valve, then a  direct acting  solenoid valve is possible. An approximate relationship between the required solenoid force  Fs, the fluid pressure  P, and the orifice areaA  for a direct acting solenoid value is: Where  d  is the orifice diameter. A typical solenoid force might be 15  N (3.   lbf). An application might be a low pressure (e. g. , 10 pounds per square inch (69  kPa)) gas with a small orifice diameter (e. g. ,  3? 8  in (9. 5  mm) fo r an orifice area of 0. 11  sq  in (7. 1? 10? 5  m2) and approximate force of 1. 1  lbf (4. 9  N)). When high pressures and large orifices are encountered, then high forces are required. To generate those forces, an  internally piloted  solenoid valve design may be possible. [1]  In such a design, the line pressure is used to generate the high valve forces; a small solenoid controls how the line pressure is used.Internally piloted valves are used in dishwashers and irrigation systems where the fluid is water, the pressure might be 80 pounds per square inch (550  kPa) and the orifice diameter might be  3? 4  in (19  mm). In some solenoid valves the solenoid acts directly on the main valve. Others use a small, complete solenoid valve, known as a pilot, to actuate a larger valve. While the second type is actually a solenoid valve combined with a pneumatically actuated valve, they are sold and packaged as a single unit referred to as a solenoid valve.Piloted valv es require much less power to control, but they are noticeably slower. Piloted solenoids usually need full power at all times to open and stay open, where a direct acting solenoid may only need full power for a short period of time to open it, and only low power to hold it. A direct acting solenoid valve typically operates in 5 to 10 milliseconds. The operation time of a piloted valve depends on its size; typical values are 15 to 150 milliseconds. Solenoid valves are used in  fluid power  pneumatic and hydraulic systems, to control cylinders, fluid power motors or larger industrial valves.Automaticirrigation sprinkler  systems also use solenoid valves with an automatic  controller. Domestic  washing machines  and  dishwashers  use solenoid valves to control water entry into the machine. Solenoid valves are used in  dentist chairs  to control air and water flow. In the  paintball  industry, solenoid valves are usually referred to simply as â€Å"solenoids. â €  They are commonly used to control a larger valve used to control the propellant (usually compressed air or CO2). In addition to this, these valves are now been used in household water purifiers (RO systems).Besides controlling the flow of air and fluids, solenoids are used in pharmacology experiments, especially for patch-clamp, which can control the application of agonist or antagonist. Many variations are possible on the basic, one-way, one-solenoid valve described above: * one- or two-solenoid valves; * direct current  or  alternating current  powered; * different number of ways and positions; INTRODUCTION TO PLC : A  Programmable Logic Controller, or PLC, is more or less a small computer with a built-in operating system (OS). This OS is highly specialized to handle incoming events in real time, i. . at the time of their occurrence. The PLC has input lines where sensors are connected to notify upon events (e. g. temperature above/below a certain level, liquid level reached, etc. ), and output lines to signal any reaction to the incoming events (e. g. start an engine, open/close a valve, etc. ). The system is user programmable. It uses a language called â€Å"Relay Ladder† or RLL (Relay Ladder Logic). The name of this language implies that the control logic of the earlier days, which was built from relays, is being simulated.The PLC is primarily used to control machinery. A program is written for the PLC which turns on and off outputs based on input conditions and the internal program. In this aspect, a PLC is similar to a computer. However, a PLC is designed to be programmed once, and run repeatedly as needed. In fact, a crafty programmer could use a PLC to control not only simple devices such as a garage door opener, but their whole house, including switching lights on and off at certain times, monitoring a custom built security system, etc.Most commonly, a PLC is found inside of a machine in an industrial environment. A PLC can run an automatic machine for years with little human intervention. They are designed to withstand most harsh environments. When the first electronic machine controls were designed, they used relays to control the machine logic (i. e. press â€Å"Start† to start the machine and press â€Å"Stop† to stop the machine). A basic machine might need a wall covered in relays to control all of its functions. There are a few limitations to this type of control. * Relays fail. * The delay when the relay turns on/off. There is an entire wall of relays to design/wire/troubleshoot. A PLC overcomes these limitations, it is a machine controlled operation. PLCs are becoming more and more intelligent. In recent years PLCs have been integrated into electrical communications  networks  Ã¢â‚¬â€œ i. e. , all the PLCs in an industrial environment have been plugged into a network which is usually hierarchically organized. The PLCs are then supervised by a control center. There exist many propri etary types of networks. One type which is widely known is  SCADA  (Supervisory Control and Data Acquisition).The PLC is a purpose-built machine control computer designed to read digital and analog inputs from various sensors, execute a user defined logic program, and write the resulting digital and analog output values to various output elements like hydraulic and pneumatic actuators, indication lamps, solenoid coils, etc. Scan cycle Exact details vary between manufacturers, but most PLCs follow a ‘scan-cycle' format. Overhead Overhead includes testing I/O module integrity, verifying the user program logic hasn't changed, that the computer itself hasn't locked up (via a watchdog timer), and any necessary communications.Communications may include traffic over the PLC programmer port, remote I/O racks, and other external devices such as HMIs (Human Machine Interfaces). Input scan A ‘snapshot' of the digital and analog values present at the input cards is saved to an i nput memory table. Logic execution The user program is scanned element by element, then rung by rung until the end of the program, and resulting values written to an output memory table. Output scan Values from the resulting output memory table are written to the output modules. Once the output scan is complete the process repeats itself until the PLC is powered down.The time it takes to complete a scan cycle is, appropriately enough, the â€Å"scan cycle time†, and ranges from hundreds of milliseconds (on older PLCs, and/or PLCs with very complex programs) to only a few milliseconds on newer PLCs, and/or PLCs executing short, simple code. ADVANTAGES OF PLC: * PLC’s have flexibility (i. e. ) it is possible to use just one model of PLC to run any one of the 15 machines. * In a PLC program circuit the PLC program can be used from any keyboard sequence in a matter of minute and rewriting is required. PLC has a large number of contacts for each coil in its programming. * I ncreased technology makes it possible to compact move functions into smaller and less expensive packages. * A PLC programmed circuit can be pre-un ad evaluated in the officer or lab. The program can be typed in tested observed and modified if needed. * PLC circuit operation can be seen during operation directly on a CRT screen. * The operation speed for the PLC program is very fast. * PLC is more reliable. * A PLC programmer who works in digital or Boolean control system can easily perform PLC programming. PLC’s program can’t be made unless the PLC properly unlocked and programmed. LADDER LOGIC DIAGRAM : What is a Ladder Diagram? A Ladder Diagram is one of the simplest methods used to program a PLC. It is a graphical programming language evolved from electrical relay circuits. Each program statement is represented with a line, called the rung, that has all relevant inputs to the left and the output to the right. The output device of a rung is energized if electric powe r can conceptually flow from the left side of the rung to the right side.Input devices are assumed to block the flow of power if they are not activated. During the execution of a ladder diagram, the PLC reads the states of all inputs, then determines the states of all outputs starting from the rung at the top side, going down to the last rung, and finally updates the state of the output devices. * Naming Convention During the development of a PLC program, we must use specific names to identify the inputs, outputs, memory flags, timers and counters. PLC manufactures use a variety of approaches in naming the inputs, outputs and other resources.A typical naming convention is to identify inputs with the letter â€Å"I† and outputs with the letter â€Å"O†, followed be a 1-digit number that identifies the slot number and a 2-digit number that identifies the position of the input or output in the slot. For example: I1:00 refers to the first input of slot 1 O2:00 refers to th e first output of slot 2. Some manufactures number the inputs or outputs starting from 00, while others use the number 01 to identify the first input or output. It is also common to use numbers like 400 e. t. c. The state of an output can be also used as an input in a ladder diagram.In such a case the PLC uses the state of the specific output device that is stored in the output image memory. * Relay Logic Instructions (XIC and XIO) Examine if Closed (XIC) —–[ ]—— Use the XIC instruction in your ladder program to determine if a bit is On. When the instruction is executed, if the bit addressed is on (1), then the instruction is evaluated as true. When the instruction is executed, if the bit addressed is off (0), then the instruction is evaluated as false. Examine if Open (XIO) ——-[/]—— Use the XIO instruction in your ladder program to determine if a bit is Off.When the instruction is executed, if the bit addressed is off (0), the n the instruction is evaluated as true. When the instruction is executed, if the bit addressed is on (1), then the instruction is evaluated as false * Relay Logic Instructions: Input Transition Sensing Positive Transition Sense (PTS) The condition of the right link is ON for one ladder rung evaluation when a change from OFF to ON at the specified input is sensed. Negative Transition Sense (NTS) The condition of the right link is ON for one ladder rung evaluation when a change from ON to OFF at the specified input is sensed. * Output Instructions Output Energize (OTE) —-( )—– If the condition of the left link of the OTE is ON then the corresponding bit in the output data memory is set. The device wired to this output is also energized. Negative Output Energize (NOE) ——(/)—– If the condition of the left link of the OTE is OFF then the corresponding bit in the output data memory is set. The device wired output is also energized. Output L atch/Set (OTL) and Output Unlatch/Reset (OTU) If the condition of the left link of the OTL is momentary ON then the corresponding bit in the output data memory is set, and remains set even if the condition switches to the OFF state.The output will remain set until the condition of the left link of the OTU is momentary ON * Basic Logic Functions (OR, AND) Two Input OR Function The output is ON only if the two inputs are OFF. Two Input AND Function The output is ON if both of the two inputs are ON. * Basic Logic Functions (NAND,NOR) Two Input NAND Function The output is ON if any of the two inputs is OFF. Two Input NOR Function The output is ON if both of the two inputs are OFF. * Basic Logic Functions (EXOR, EXNOR) Two Input EXOR Function The output is ON if any of the two inputs is ON, but not both. Two Input EXNOR FunctionThe output is ON if both of the two inputs are either OFF or ON. * Set/Reset Latch Set/Reset Latch using a Hold-in contact Set/Reset Latch using Latch/Unlatch out puts Notes: O1:00’ means that the output is unchanged If both inputs are ON then normally the output is OFF, since the Unlatch rung appears last in the ladder diagram. * Timer Instructions Timer Instructions are output instructions used to time intervals for which their rung conditions are true (TON), or false (TOF). These are software timers. Their resolution and accuracy depends on a tick timer maintained by the microprocessor.Each timer instruction has two values (integers) associated with it: Accumulated Value (ACC): This is the current number of ticks (time-base intervals) that have been counted from the moment that the timer has been energized. Preset Value (PR): This is a predetermined value set by the programmer. When the accumulated value is equal to, or greater than the preset value, a status bit is set. This bit can be used to control an output device. Each timer is associated with two status bits: Timer Enable Bit (EN): This bit is set when the rung condition to t he left of the timer instruction are true.When this bit is set, the accumulated value is incremented on each time-base interval, until it reaches the preset value. Done Bit (DN): This bit is set when the accumulated value is equal to the preset value. It is reset when the rung condition becomes false. * Timer On-Delay (TON) Instruction The TON instruction begins count when its input rung conditions are true. The accumulated value is reset when the input rung conditions become false. Timer ladder diagram example. Typical timing diagram (Assume that Preset = 07). * Timer Off-Delay (TOF) InstructionThe TOF instruction begins count when its input rung makes a true-to-false transition, and continues counting for as long as the input rung remains false. The accumulated value is reset when the input rung conditions become false. Timer ladder diagram example. Typical timing diagram (Assume that Preset = 07). * Retentive Timer (RTO) Instruction The RTO instruction begins count when its input rung conditions are true. The accumulated value is retained when the input rung conditions become false, and continues counting after the input rung conditions become true. * Counter InstructionsCounter Instructions are output instructions used to count false-to-true rung transitions. These transitions are usually caused by events occurring at an input. These counters can be UP (incrementing) or DOWN (decrementing). Each counter instruction has two values (integers) associated with it: Accumulated Value (ACC): This is the current number of the counter. The initial value is zero. Preset Value (PR): This is a predetermined value set by the programmer. When the accumulated value is equal to, or greater than the preset value, a status bit is set. This bit can be used to control an output device.Each counter is associated with two status bits: Counter Enable Bit (EN): This bit is set when a false-to-true rung condition to the left of the counter instruction is detected. Done Bit (DN): T his bit is set when the accumulated value is equal to the preset value. It is reset when the rung condition becomes false. The maximum count value is 9999*. After a maximum count is reached, the counters reset and start counting from zero. * Count-up (CTU) Instruction The CTU instruction increments its accumulated value on each false-to-true transition at its input, starting from 0. Counter ladder diagram example.Typical timing diagram (Assume that Preset = 10). * Count-down (CTD) Instruction The CTD instruction decrements its accumulated value on each false-to-true transition at its input, starting from 0. Counter ladder diagram example. Typical timing diagram (Assume that Preset = -10). * The Reset (RES) Instruction The RES instruction resets timing and counting instructions. When the RES instruction is enabled it resets the following. Counters:Accumulated value, Counter Done Bit , Counter Enabled Bit. Timers: Accumulated value, Timer Done Bit, Timer Timing Bit, Timer Enable Bit.R eset ladder diagram example. ADVANTAGES ; APPLICATION: * Automatic control of machine. * Free from manual operation and frequent checking. * Machine fault is reduced. * Energy consumption is reduced. * This method can save more power. * Industrial application mainly used for boiler production. * Drilling and boring applications. * This applications can be implemented for all machines in BHEL. BOW CORRECTION MACHINE : These are the specifications of the bow correction machine currently in use. MACHINE| BOW CORRECTION MACHINE| CAPACITY| 600 TONS| CYLINDER BORE| 550 MM| RAM DIAMETER| 520 MM|DAYLIGHT| 3000 MM| THROAT| 1700 MM| STROKE| 500 MM| CONNECTED LOAD| 60+1+5 HP| TOTAL WEIGHT| 80 TONS| BOLSTER SIZE| 1500*2000*200 MM| SPEEDS OF OPERATION| 15mm/sec – APPROACH6mm/sec – PRESSING60mm/sec – RETURN | PURPOSE. In the pipes used in boilers, small pipes are attached using welding. This welding makes the pipe to bent. Thus its surface becomes uneven and makes it imperfec t to be used in boilers. In this case this machine is used. Using this machine the bents and bows can be straightened and makes the pipes perfect to be used in the boilers. CIRCUIT DIAGRAM : OPERATION.The hydraulic circuit is designed to achieve fast approach speed, slow pressing speed and fast return speeds by use of a single pump. The fast approach speed is achieved by ensuring that the cylinder ram moves down through its self weight or what is termed as gravity fall. To achieve gravity fall of the cylinder of the cylinder it is important to ensure that at all times the pressure in return line is minimum 5 kg/ cm2. On starting the motor the pump delivery is directed to the tank through unloading type relief valve no. 4. The same flow is directed to the Z1 lines of catridge valves 5 ; 7, which ensures that the valves are closed.On operation of solenoid S1 of main relief valve the pump flow is directed to the catridge valves, however due to differential areas the catridges are still closed and pump reaches system pressure and unloads to tank through relief valve 4. On operation of solenoid S2( valve 6) along with S1, Port A of solenoid valve no. 6 is connected to tank Y1 which facilitates opening of catridge valve 5 and hence the oil flows into the forward line of the cylinder resulting in downward movement. At the same time the oil in the return line of the cylinder is connected to tank at the set pressure through valve no. 11.Hence the cylinder moves down with slow pressing speed. On operation of solenoid S4 ( valve 8) along with S1 ; S2 the X port of catridge valve 10 is connected to tank through valve 8, 6 and port Y1 that ensures the opening of the catridge valve 10. Opening of the catridge valve ensures that the return line is connected directly to tank and hence the cylinder oves down with its self weight and fast approach speed is achieved. At the same time prefill valve 14 opens to fill the cylinder forward area with oil. To set the maximum fast appro ach speed valve 10 is provided with a stroke adjustment setting.On operation of solenoid S3(valve 6) along with S1, port B of solenoid valve no. 6 is connected to tank Y1 which facilitates opening of catridge valve 7 and hence oil flows into the return line of the cylinder. At the same time since A port of solenoid valve no. 6 is connected to pump port X4 is also connected to pump, ensures the opening of prefill valve no 14 and that the forward line of the cylinder is connected back to tank. This results in reverse movement of the cylinder. Pressure relief valve 9 is provided to ensure smooth deceleration of the cylinder from fast approach to pressing.The valve ensures that the pressure in X port of the cartridge valve does not exceed set pressure therby ensuring that the valve closes slowly reducing jerks. The hot oil from the machine is then sent to the chiller unit to reduce its temperature. CHILLER UNIT: In the chiller unit, the refrigerant is used to cool down the hot oil from the machine. REFRIGERATION: A liquid whose Saturation temperature at normal atmospheric pressure is below the temperature that is to be produced by refrigeration is chosen as the working liquid in the refrigerant.Such a liquid will evaporate at lower temperatures and will absorb hear as it does so. This heat is extracted from the surroundings. The vapour formed in this way is compressed in a compressor. After compression the refrigerant may be in the vapour state or, in the liquid state if its temperature after compression is not greater than the saturation temperature at that increase pressure. The low temperature vapour is condensed in a condenser, in doing so it lowers its temperature below the surroundings . Now the condensed liquid is expanded to a lower pressure and the cycle of refrigeration is repeated.REFRIGERATION CYCLE: * Compressors are used in vapour compression cycles. It is the heart of the system and it sucks low-pressure refrigerant vapour from the evaporator and co mpresses it to a pressure corresponding to the saturation temperature that will be higher than continuously re-circulate the refrigerant through the system. * Air-cooled condensers are heat exchangers,which reject heat from the condensing refrigerant to the atmosphere. * The function of condenser in a refrigerated system is to de-superheat and condense the compressed discharge refrigerant vapour.High-speed fans are mostly used to speed up the process. * At the exit of the condenser the refrigerant loses temperature but still is in high-pressure state. The temperature falls down a little high to the ambient. * Dryers are mainly used to capture the moisture content if any mixed with the refrigerant. When the refrigerant passes through its thin filter mesh the moisture gets trapped on the silica gel and clean refrigerant flows through. * Throttle valve(also called as Expansion valve)is also a very important component of the vapour compression refrigeration system.The function of an exp ansion device is to expand the liquid refrigerant from the condensing pressure to the evaporating pressure. Also it throttles the required flow into the evaporator depending on the load conditions. Commonly used expansion devices are capillary tubes, thermostatic expansion valves and constant pressure expansion valves. * Any liquid when evaporate creates a cooling effect. Same applies here, when the refrigerant exists expansion valve it is partly in vapour state at low temperature and pressure. It flows through the evaporator and exchanges heat with the surroundings. After existing the evaporator it has gained heat from the surrounding media, thus lowering the temperature in the freezing compartment. This superhead vapour passes further and is drawn by the compressor, which compresses it,and delivers to condenser, thus, completing the refrigeration cycle. The ladder diagram used in this machine is : CNT_ON CNT_OFF MEM_1 MEM_1 MEM_1 MOT_ON MOT_ON MOT_OFF VAL4_ONVAL4_ON VAL4_ON MEM _2 MEM_2 S1 S2 S3 S4 S5 FAST_APP FAST_APP S1 S2 S3 S4 S5 PRESS_ON TIMER T1 PRESET 15 ACC 0 PRESS_ON S1 S2 S3 S4 S5 HOLD_ON HOLD_ON HOLD_MEM HOLD_MEM S1 S2 S3 S4 S5 RET_ONRET_ON VAL4_ON COMPARE TEMP_ON;45 TEMP_ON MEM_4 MEM_4 CHILLER_ON TEMP_ON CHILLER_OFF COMPARE TEMP_ON;45 LOW_SEN ALARM_ON V_LOW_SEN TANK_ONPRES_ON VAL14_ON EXISTING SYSTEM : * There is no temperature detection system. Hence, the chiller unit has to function continuously irrespective of hydraulic oil’s temperature. * Possibilities of machine can run due to friction since there is no Indication of oil in tank. * The chiller unit is running continuously hence there is a possibilities of lot of Energy consumption losses. * There is no automatic control for the whole machine. * There is no automatic function for declamping and lubrication. There is no oil level sensor in the hydraulic tank to sense the oil level in the tank. * Relays are used which is not automatic and inefficient. HORIZONTAL BORING MACHINE HY DRAULIC TANK CHILLER UNIT PUMP SOLENOID VALVE PROPOSED SYSTEM: * In this method there is a temperature sensor which is used to sense the temperature of the oil in the hydraulic tank. * The chiller unit will be turned on only when the oil temperature gets increased with the specified value of oil temperature * Friction of the machine can be reduced by implementing the lubrication function. Oil level in the hydraulic tank can be detected by using an oil level sensor . * Two types of oil level sensor is used. I. Low level sensor II. Very low level sensor So that we can avoid the machine running in dangerous condition. * All the operation in one axis (x or y or z) can be operated by a single push button switch. * Declamping and lubrication function takes place automatically. ENERGY SAVING CALCULATION: * WITH CHILLER UNIT WORKING CONTINUOUSLY: For continuous running of chiller unit the motor consumes 18KW. Per day: morning -4hrs night -8hrs so chiller unit runs totally 12hrs a day. 8KW*1 2hrs=216 KWhr The chiller unit consumes 216KWhr per day. For electricity: 1unit= Rs. 5 Therefore 216*5= 1080 So for 216 unit it costs Rs. 1080 per day. 1080*30=Rs. 32,400 For 1month it costs Rs. 32,400 32400*303= Rs. 98,17,200 For 1year it costs Rs. 98,17,200. * WITH PLC: For automatic on/off of chiller unit the motor consumes 10KW. Per day: morning -4hrs night -8hrs so chiller unit runs totally 12hrs a day. 10KW*12hrs=120KWhr The chiller unit consumes 120KWhr per day. For electricity: 1unit= Rs. 5 Therefore 120*5= 600 So for 120unit it costs Rs. 600 per day. 600*30=Rs. 8,000 For 1month it costs Rs. 18,000 18000*303= Rs. 54,54,000 For 1year it costs Rs. 54,54,000. CONCLUSION : This project mainly focuses the oil temperature and oil level detection and also the automatic control of machine. Implementation of this project is simple and very economical. This applications can be implemented for all machines in BHEL. All the functions can be achieved through a single PLC program. The adv antage of our project is used to eliminate manual checking and operation. The above mentioned parameters and operation can be sensed and operated through PLC.This project saves more power to industries by reducing the power consumption. REFERENCES : 1. â€Å"Allen bradely Instruction Set user manual† by Rockwell Automation. 2. Programmable Logic Controllers: Programming Methods and Applications by John R. Hackworth and Frederick D. Hackworth, Jr 3. â€Å"Ladder logic fundamentals† industrial control system fall 2006. 4. DOE FUNDAMENTALS HANDBOOK â€Å"INSTRUMENTATION AND CONTROL Volume 2 of 2†- U. S. Department of Energy Washington, D. C. 20585. 5. â€Å"Automating Manufacturing Systems with PLCs† (Version 5. 0, May 4, 2007) -Hugh Jack