Electrician exam positive and negative circuit diagram and connection diagram
The following are the principles of the motor positive and negative circuit diagrams and connection diagrams involved in several common electrical examinations: ** I. Contactor interlocked motor reversing control circuit ** 1. ** Principle ** - Forward rotation control: Turn on the power switch Q, press the forward start button SSB2, and the coil of the contactors KM1 will be energized and pulled in. At this time, the main contact is closed to connect the motor to the power supply, and the normally open auxiliary contact is closed to realize self-locking (even if the SSB2 button is released, the KM1 coil is still energized). The motor M is rotating in the forward direction. At the same time, the normally closed auxiliary contact of the KM1 was disconnected, which prevented the power supply of the contactors KM2 (realizing the interlocked, preventing the two contactors from being energized at the same time and causing short-circuit and other faults). At this time, the phase sequence of the power supply connected to the motor was A-B- C. - Reverse rotation control: If you want the motor to change from forward rotation to reverse rotation, first press the stop button SSB1, so that the forward rotation circuit is cut off (the KM1 coil loses power, the main contact is cut off, the normally open auxiliary contact is cut off, and the normally closed auxiliary contact is restored to be closed), and then press the reverse start button SSB3. The KM2 coil is energized and attracted, and its main contact and the normally open auxiliary contact are closed, so that the motor can rotate in reverse. At the same time, the normally closed auxiliary contact of KM2 was disconnected to prevent the contact KM1 from being energized. At this time, the phase sequence of the power supply connected to the motor was C-B- A. To stop the electric motor, press the stop button SSB1. 2. ** Connection diagram key points (illustration)** - The main circuit part: the three-phase power supply is connected to the fuse (for protection), then connected to the main contacts of the contactors KM1 and KM2, then connected to the thermal relay (for overload protection), and finally connected to the motor. Among them, the main contact connection of KM1 and KM2 must ensure the correct switching of phase sequence during forward and reverse rotation. - The control circuit part: connect the stop button SSB1 (normally closed contact) from the power lead. The other end of SSB1 is connected to the forward start button SSB2 (normally open contact) and the reverse start button SSB3 (normally open contact) respectively. The other end of the SSB2 is connected to the coil of the contactors KM1, and the normally closed auxiliary contact of the KM2 is connected in series on this line to realize the interlocked connection; the other end of the SSB3 is connected to the coil of the contactors KM2, and the normally closed auxiliary contact of the KM1 is connected in series on this line to realize the interlocked connection. The normally open auxiliary contacts of the contactors KM1 and KM2 are respectively connected in parallel with their respective start buttons to realize the self-locking function. ** 2. Double interlocked reversing circuit ** 1. ** Principle ** - This circuit combined a button interlocked with a contactors interlocked. The button interlocked was achieved through the circuit design of the forward start button SSB2 and the reverse start button SSB3, and the contactors interlocked through the normally closed auxiliary contacts of KM1 and KM2. The advantage of this design was that it could directly switch the direction of the motor, which improved the convenience and safety of the operation. 2. ** Connection diagram key points (illustration)** - The main circuit is similar to the control circuit of the positive and negative rotation of the interlocked motor. - Control circuit part: on the basis of the interlocked contactors, the normally closed contacts of the forward start button SSB2 and the reverse start button SSB3 are respectively connected in series to the starting circuit of the other party to achieve button interlocked. For example, the normally closed contact of the SSB2 is connected in series in the circuit connecting the SSB3 and the KM2 coil, and the normally closed contact of the SSB3 is connected in series in the circuit connecting the SSB2 and the KM1 coil. ** 3. Automatic shuttle control circuit (an application of the motor's forward and backward rotation)** 1. ** Principle ** - After switching on the power switch QL, press the start button (similar to the forward start button), the contactors KM1 will self-lock, and the trolley will start to move forward. When the limit switch SQ1 was touched, the KM1 coil lost power, the KM2 self-locked, and the trolley ran in the opposite direction. As long as the stop button was not pressed, it would cycle. 2. ** Connection diagram key points (illustration)** - The main circuit part was also a three-phase power supply to the motor through the fuse, the main contact of the contactors, and the thermal relay. - Control circuit part: In addition to the control circuit of the positive and reverse contactors KM1 and KM2 (including interlocked), it also needs to be connected to the travel switch SQ1 and SQ2 (used to control the positive and reverse limits respectively). For example, in the forward operation, the KM1 self-locking circuit is connected in series with SQ2 (normally closed contact). When the trolley touches SQ2, the KM1 coil loses power; in the reverse operation, the KM2 self-locking circuit is connected in series with SQ1 (normally closed contact). When the trolley touches SQ1, the KM2 coil loses power. Read more exciting novels for free
Zhangpu Sui 'an town Adier kindergarten recruitment
Zhangpu County's Sui 'an Aidier kindergarten is recruiting kindergarten teachers. The educational requirements are junior college. The salary range is 3,000 - 4,500 yuan. The maximum salary is 3,000 - 4.5K (data as of August 27, 2023). There were also recruitment information showing that there were no restrictions on education and experience for early childhood teachers across the country. The salary was 2 - 6,000 yuan. In Zhangzhou, the salary was also 2 - 6,000 yuan for those with college education and experience. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The concubine is favored by the novel, the female protagonist is very enchanting, the novel is recommended
Here are some recommendations for novels that are favored by concubines and have a seductive female lead: - "But She's Seductive": The story between the female lead, the charming and charming top star in the capital, Tang Wu, and the overbearing prince, Song Mo, who forbade love and cut off desire. There are many plots in the text that show the charm of the female lead and the change of the male lead's feelings for the female lead, from disgust to deep love. - < As a Concubine >: The Lord of the Plains, who had a voice-activated facial paralysis, had a delicate concubine. The female protagonist had a unique charm in the process of getting along with the Lord. Not only did she cure the Lord's insomnia, but there were also many emotional entanglements between the two. - " The Dumb Concubine, She's Charming and Touching ": The story between the little mute concubine, who is soft on the outside but tough on the inside, and the mad dog beauty Regent. Although the female lead of the mute concubine can't speak, she has a unique charm. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
To recommend the stories of disabled people to the world
The following are some examples of the content of the "Stories of Disabled People to the World": ** 1. Title ** "Amazing Stories of Disabled People" ** 2. Section content ** 1. ** The Story of Itzhak Perlman ** - Yitzhak Perlman was an outstanding violinist. He was born in Israel and started playing the violin at the age of three and a half. However, when he was four years old, his legs were paralyzed due to rabies. Despite his physical disability, his musical talent continued to bloom. He started performing in concerts at the age of nine, and when he was 13, he got the chance to participate in the Ed Sullivan-variety show. His family moved to New York, and in a difficult environment, he studied English while studying the violin at the Juilliard School. In March 1964, at the age of 19, he won the highest award in the Edgar Leventret International Violin Competition. He was sitting in a wheelchair with superb skills and was called the " Prince of the Violin." He used his own actions to explain that disabled people could also achieve extraordinary achievements in the field of art. - Itzhak Perlman, an outstanding violinist, was born in Israel. He started playing the violin at the age of three and a half. However, at the age of four, he was paralyzed in both legs due to polio. Despite his physical disability, his musical talent continued to shine. He began performing in concerts at the age of nine. At the age of 13, he got the opportunity to participate in the "Ed Sullivan Variety Show". His family moved to New York. In a tough environment, he learned English while studying the violin at the Juilliard School. In March 1964, at the age of 19, he won the highest award in the Edgar Leventritt International Violin Competition while sitting in a wheelchair, and was known as the "Prince of Violin". He showed that disabled people can also achieve extraordinary success in the field of art with his own actions. 2. ** The Story of Tang Zhanzhong ** - Tang Zhanzhong was a physically disabled man, born in 1981 in Mengshan County, Guangxi Zhuang Autonomous Region. He was born without arms, so he used his feet to live, write, and paint. He overcame many difficulties in the process of growing up. In 1993, he won the first "Top Ten Disabled Youth Talent Award in China". In 1996, he won the Excellent Painting and Calligraphy Award from the United Nations Education and Culture Organization. In 1997, he published the book "Feet and Life", which attracted national attention. He was admitted to the Fine Arts Department of the Guangxi Institute of Art with perseverance and became a graduate student of the school's Chinese Painting Department. He also served as a member of the China Disabled Artists Association. His oral and written works have won many awards. His story showed that disabled people could succeed in many aspects such as art and academia through their own efforts. - Tang Zhanzhong, a male with physical disability, was born in Mengshan County, Guangxi Zhuang Independent Region in 1981. He was born without arms and uses his feet to live, write calligraphy and paint instead of hands. He overcame many difficulties during his growth. In 1993, he won the first "Top Ten Disabled Teenagers' Talent Achievement Award in China". In 1996, he won the excellent award for calligraphy and painting works issued by UNESCO. In 1997, he published the book "Feet and Life", which attracted national attention. With his perseverance, he was admitted to the Fine Arts Department of Guangxi Arts Institute and became a postgraduate in the Chinese painting major of this school. He also serves as a member of the Chinese Disabled Artists Association, etc. His works created by mouth and feet have won many awards. His story shows that disabled people can achieve success in art, academics and other aspects through their own efforts. 3. ** How to help the disabled ** - In our society, helping the disabled is a traditional virtue. Although we might not be able to give them a lot of money, we can help them in their daily lives. For example, helping blind people cross the road, helping people with inconvenient hands to carry things, and so on. We should reach out to the disabled who need help, so that our world will become a better place. - In our society, helping the disabled is a traditional virtue. Although we may not be able to give them a large amount of money, we can offer help in daily life. For example, helping the blind cross the road, helping people with inconvenient hands to carry things, etc. We should give a helping hand to the disabled in need, so that our world will become more beautiful. ** 3. Decoration ** You could draw some pictures related to disabled sports on the edge of the handwritten copy, such as the wheelchair logo, the logo of the paralympics, etc., or draw some scenes of disabled people overcoming difficulties, such as a person walking on crutches climbing to the top of a mountain. These patterns could both embellish the handwritten newspaper and better reflect the theme. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The novel of Douluo punching in from Spirit Hall
According to the information provided, the novel "Starting from Douluo" might involve the plot of starting from Spirit Hall. The main character of the novel had a series of experiences in Spirit Hall, such as awakening three spirits in Spirit Hall, innate full spirit power rank thirty becoming Spirit Hall Academy genius, etc., among which might contain contents related to Spirit Hall. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
State Development Small and Micro-Enterprise Management Form Test Answer
The following are the answers to the questions related to the National Small and Micro-Enterprise Management Examination: 1. The internal environmental power of the enterprise belonged to the micro-environment of the enterprise. The answer was yes. 2. In start-ups, the reason for the highest failure rate was that they could not find a profit model. 3. The risk control of the business model mainly included determining that the customer's demand was strong enough, being vigilant of entering industries with low barriers, preventing losses caused by the departure of partners, and sufficient financial planning to prevent capital from being cut off. As the reference materials did not fully present the contents of the Form Test, this was only a sample of the answers. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The novel name of the male protagonist surnamed Lu
In the book, the male protagonist's surname is Lu, and his name is Lu Heng. He transmigrated to the late years of the Great Qi Dynasty and awakened a small immortal cultivation game that can automatically hack and obtain various resources and rewards. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The development of China engraving can be divided into several stages
The development of Chinese printmaking can be generally divided into three important stages, namely the initial stage, the development stage and the prosperous stage. In the initial stage, traditional Chinese printmaking has a long history of two thousand years with distinct national characteristics. It is a gem of Chinese traditional culture and art. China is among the first countries where printmaking emerged. Tracing back to the origin of printmaking, from a large number of unearthed Neolithic artifacts, we can see patterns on pottery vessels three thousand years ago. The geometric patterns such as rope marks, mat marks, and cloth marks were all made by stamping, which was the initial form of plate - making. The inscriptions on oracle bones in the Yin - Shang period, the bronze inscriptions and bird - and - beast patterns in the Shang - Zhou period, the development of gold and stone in the Qin - Han period, and the improvement of metal carving tools, especially the epoch - making creation of Han stone reliefs, provided sufficient technical preparations for the emergence of woodcut printing. China has long had the habit of using seals as credentials. In fact, whether it is using a seal to print characters on paper with ink paste or taking rubbings of inscriptions on steles with paper and ink, both methods are directly related to woodcut printing. Although we cannot be sure whether woodcut printing existed at that time, it can be determined that the method of taking stele rubbings was an important precondition for the development and growth of Chinese woodcut printing. In the 1st century AD, China invented papermaking, and the appearance of paper provided the most direct condition for the invention of woodcut printing. The existing woodcut print is the "Jetavana" preaching picture on the frontispiece of the first volume of the "Diamond Sutra" printed by woodcut in 868 AD (Tang Xian - tong 9th year), which was discovered in Dunhuang Mogao Grottoes in 1900. This carved Buddhist painting has a full composition, a compact structure, vivid and delicate figure portrayals, and powerful lines, looking very concise and skillful. It can be inferred that the appearance of Chinese printmaking was earlier than this painting. In the Tang Dynasty, woodcut printing mainly served Buddhism, and the prosperity of religion at that time promoted the development of the printing industry. The import of Indian culture at that time was reflected in the woodcut art. Most of the woodcut art reflected the plots in Buddhist scriptures. The images of Buddha, Bodhisattva, Arhat, and Vajra in the paintings adopted the neat and delicate line - drawing positive carving technique, emphasizing shape - making with lines, and the color was a single ink color or cinnabar, with a very clean and soft combination, giving people a very comfortable feeling, which was in line with the painting style at that time. In the development stage, during the Song, Yuan, Ming, and Qing dynasties, the economic development in the Northern Song Dynasty promoted technological innovation and progress. With the improvement of handicraft technology and the prosperity of literature and art, woodcut art became popular and achieved great success. At this time, woodblock prints adapted to the needs of the people, and the scope of materials was very wide, including almanacs, medical books, classics, arithmetic, painting manuals, etc. Prints were used in agricultural books, "Yingzao Fashi", acupuncture maps, and illustrations of novels, with numerous engraved versions. At that time, the woodcut printing industry in the Northern Song Dynasty was very developed. From official to private bookshops, all were engaged in woodcut printing. The quantity was large, the scope was wide, and the production was exquisite, not only surpassing the previous generation but also difficult to compare with the Ming and Qing dynasties. In addition, folk prints and Buddhist prints also had new developments. In the Yuan Dynasty, the woodcut printing technology tended to be excellent, evolving from a single ink plate or cinnabar plate to two - color overprinting of red and ink. Due to the further development of productivity, the Ming society showed a long - term stable and prosperous situation. People's huge demand for various books directly stimulated the handicraftsmen of woodcut printing to increase the quantity and quality of products. The competition among booksellers became increasingly fierce, which raised the art of printmaking to a new level. Some famous painters began to participate in the drawing of woodcut plates. The rapid development of opera and novel creation also provided opportunities for printmaking to make illustrations. In the prosperous stage, in the late Ming Dynasty, Chinese printmaking entered its heyday. During this period, many schools of printmaking emerged according to regions, such as Jinling printmaking, Huizhou printmaking, Wuxing printmaking, Wulin printmaking, and Jian'an printmaking, and a large number of excellent works emerged continuously. Just for the illustrated version of "The Romance of the Western Chamber", several versions appeared. From the late Ming to the early Qing Dynasty, printmaking flourished. Due to the cooperation between famous painters and famous engravers emerging at this time, many excellent prints were created. Zheng Zhenduo said in the preface to "The History of Printmaking": "Therefore, when Chen (Lao - lian) and Xiao (Chi - mu) freely waved their brushes, whether it was deep or shallow, thick or thin, strong as if a thousand - foot - high cliff, or soft as if a new brush touching the paper, they could all achieve vividness and resemblance to the original painting, much like an ink painting, not like a woodcut. " Thus, the paintings and engravings complemented each other. In 1638 AD (Ming Chong - zhen 11th year), Chen Hongshou's engraved version of "Chu Ci - Jiu Ge", and in 1645 AD (Qing Shun - zhi 2nd year), Xiao Yuncong's engraved version of "Lisao Tu" were both printmaking works with the poems of the famous patriotic poet Qu Yuan as the theme. These two sets of works are high - quality illustrated prints in Chinese printmaking history and reflect the prosperity of Chinese printmaking in the late Ming and early Qing dynasties. In the late Qing Dynasty, the art of printmaking gradually declined. With the invasion of imperialism, modern printing techniques were introduced into China, and traditional woodcut printing techniques and the printmaking derived from them began to be neglected. In the 1920s, Mr. Lu Xun introduced woodcut printmaking from abroad and promoted it, enabling the further development of Chinese printmaking. After liberation, the forms of expression and artistic techniques of printmaking were ever - changing, excellent printmakers emerged in large numbers, and their creative styles varied, presenting a flourishing situation. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The latest chapter of the honey pet's cute wife novel
The latest chapters of " The Cute Wife " included: Chapter 1," Cold Operating Table ", Chapter 2," Pregnant with Twins ", Chapter 3," Five Years Later ", Chapter 4," Mr. Face Paralysis ", Chapter 5," You're So Beautiful Tonight ", Chapter 6," Awkward Scene ", Chapter 7," Revenge of Humiliation ", Chapter 8," Swaggering Away ", Chapter 9," Danger Is Closer Step by Step ", Chapter 10," His Bed ", Chapter 11," She's in Trouble ", Chapter 12," Prison of Human Hearts ". Chapter 13:" The Big Battle royale ", Chapter 14:" The Twins Mistaken Their Mistakes ", Chapter 15:" Poor Baby Moves into a Wealthy Family ", Chapter 16:" The Life of a Young Master ", Chapter 17:" Finally Found You ", Chapter 18:" Wealthy Baby Becomes a Loser ", Chapter 19:" The Woman Who Was Kicked Out of the Bed ", Chapter 20: Dig a Trap for Her to Jump Into ", Chapter 21:" Evil Guidance ", Chapter 22:" It's Definitely Intentional ", Chapter 23:" Finally Found You " Chapter 24: This Man Is Hate Enough, Chapter 25: Good in Bed, Chapter 26: Longjing Tea in Silk Stockings, Chapter 27: Soulless! Chapter 28 " Secret notepad ", Chapter 29 " Ambiguous Tranquility ", Chapter 30 " Sudden Bad News ", Chapter 31 " Heart Connection ", Chapter 32 " Be His Lover ", Chapter 33 " First Night ", Chapter 34 " Crazy Shopping After Leaving the Hospital ", Chapter 35 " Why Are You Crying ", etc. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The novel of the princess in a coma
In the reference materials, there was a plot related to the princess's coma in the Flower Order, but the document did not elaborate on the whole plot. Another novel mentioned that the viscountess had been unconscious for three days. After she woke up, her body had some changes, such as the pain in her waist was relieved, her whole body was full of strength, and her movements were light. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
When will the Lotus Festival be held in 2024?
The following are the dates of some of the Lotus Fairs in 2024: - The Song Jiang Lotus Festival opened on July 5th and lasted until National Day. - The 16th Lotus Festival was held from July 19th to 21st. - The Mingcui Lake Lotus Festival was about to begin (specific date not mentioned). - The Golden Lake Lotus Festival would begin on June 10th. - The second Lotus Festival in Yaotou Village, Dong 'e Town, Pingyin County, began on June 14th and continued until National Day. While waiting for the TV series, you can also click on the link below to read the original work of "Little Fox Demon Matchmaker" to understand the plot in advance!