21-04-2014, 04:31 PM
Automatic Induction Motor Starter with Programmable Timer
Automatic Induction Motor.doc (Size: 104 KB / Downloads: 11)
INTRODUCTION
Man is an ambitious creator. He has conquered the world of science and has reached to this 21ST century. In pre-cuts of perfection. He has cared much for automation and product quality which is directly co related to electronics.
In this fact developing society, electronic has come to stay as the most important branch of Engineering. Electronic devices are being used in almost all the industries for quality control and automation. They have become a fast replacement of present workers army which is engaged in processing and assembling of the factory.
Great strides taken in the industrial applications of electronics during recent years have demonstrated that this versatile tool can be of great importance in increasing production. Efficiency and control. The rapid growth of electronic technology appears as a formidable challenge to the beginners. The purpose of this introduction is the presentation of elementary knowledge of modern electronics.
PURPOSE OF PROJECT
An engineer discover new ideas and identifies opportunities in various sectors of national economy. He explores the possibilities of starting adventures infield of agriculture, trade, industry, transport and communication etc.
An engineering project is a combination of numerous activities on the part of entrepreneurs, organisers, designers, workers and etc. project is a reflection of hard but harmonious labour on the part of above agencies.
The engineer is the key element in any project work and it is not possible to attain success for every engineer. An engineer should posses certain qualities and characteristics to achieve success in project or task undertaken. The characteristics which contribute to engineers success in his.
Technical competence, better judgement, intelligence, leadership, self confidence, attitude of creativeness, honesty and emotional stability.
Automatic induction motor starter with programmable timer.
Induction motors are popular due to their low-cost, sturdy construction, fast pick-up , low maintenance expenditure and good efficiency. The DOL ( direct-on-line ) starters and star/delta starters used for starting and running of induction motors provide coarse type of protect ions against voltage fluctuations and single phasing. Induction motors are very sensitive to low voltage and single phasing during which they draw a heavy current and can burn out unless switched of within few seconds of occurrence of such conditions. This makes the requirement of a sensitive protective device absolutely essential to avoid burning of induction motors under such conditions.
THE CIRCUIT
As the circuit being described is required to be used with a DOL starter, the internal diagram of the same is given in Fig. 1. The three phases (R. Y, and B) entering the starter are passed via fuses Fl, F2. and F3. The current rating of the fuses would depend on contactor and motor current ratings. The three phases from the DOL starter are extended to the automatic starter circuit of Fig. 2 via points marked R ', Y', and B'. The other points which are to be extended to Fig. 2 are marked C through F. All the points marked identically in Figs I and 2 are to he connected together.
INTEGRATED CIRCUIT 4060
DESCRIPTION :
Integrated circuit 4060 is a sixteen pin CMOS integrated circuit. It is a twelve stage Ripple Carry Binary Counter. The counters are advanced one count on the negative transition of each clock pulse. The counters are reset to the zero state by a logical “I” at the reset input independent of clock.
CHARACTERISTICS ;
1. It has wide supply voltage range from Iv. To I 5v.
2. Integrated circuit 4060 had high noise immunity s 0.45 VDO.
3. Its lower power Transistor Logic is Fan out of two driving 741. or one driving 74LS.
4. Maximum speed of operation is 8 MHz. Tip. At = 10 volts.
5. It is used Schmitt trigger clock input.