问题 问答题 简答题

简述YLB加压变频装置给电操作步骤?

答案

参考答案:

⑴操作盒运行开关置断开位置时,ZK1、ZK3、ZK4均处于断开,可编程控开关S1置于停止;

⑵外部电源合闸后,顺次合上ZK1、ZK3、ZK4,开关S1置于运行;

⑶给电后,如加压变频装置无异常,黄色指示灯亮;

⑷确认变频器内部参数已设置正确,电动机及负载机械完好;

⑸将操作盒上速度给定电位器调至最小,合上开关黄色指示灯灭,绿色指示灯亮,逐步增大给定,频率表同步增大;

⑹开关为手动/自动转换开关,合上开关时,运行在自动模式。当回转电动机电流增加到0.8Ie时,加压速度逐渐自动下降;当回转电流大于1.4Ie时,加压速度在0.5秒内迅速减到停机状态,经5秒延时后,加压速度自动上升,自动模式运行时对回转电流进行监测和自动控制。当运行在手动状态时,装置不能对回转电流进行监测和自动控制,加压速度须由人工设定。

单项选择题 案例分析题
阅读理解

阅读理解。

     Although Wu Huifei was only a concubine (妃子) of Tang Xuanzong (AD 685-762), the sixth

emperor of the Tang Dynasty, her influence was far greater than most in her position.

     Historians say that the ruler loved her so much that, in AD 724, he banished his wife and made

Wu a royal concubine.

     "Although she was only a concubine, she was treated as an empress with palace etiquette (礼节),"

explained Shi Xiaoqun, director of relics collection for Shaanxi History Museum. "Tang Xuanzong even

wanted to make her his empress but was opposed by the ministers."

     The emperor had thousands of concubines in his palace in Chang'an (now called Xi'an, capital of

Shaanxi province) but, according to Shi, he only loved Wu, the mother of seven of his children.

     Wu died in the December of AD 737 at the age of 38 and was buried in Jingling Mausoleum. She

was given the title Empress Zhenshun after her death.

     "It's rare for a concubine to be given so much posthumous (死后获得的) honor in the history of

Chinese feudal (封建) society," said Liu Daiyun, research director at the Shaanxi Archaeological

Research Institute.

     Her tomb -53 meters wide by 56 meters long - is located in the west of Pangliu village, which is

part of Xi'an's Chang'an district.

     The recovered sarcophagus (石棺) is 4 meters long, 2 meters wide and 2 meters tall and is

decorated with flowers and maiden figures, which archaeologists say is a rare cultural relic of high

scientific, historical and artistic value. In ancient times, a sarcophagus was used to house wood coffins

in order to preserve the body of the noble person.

     "I knew it was precious but I didn't know it was so beautiful," said Han Qinglong, who headed the

team that brought the relic back to China four years after it was stolen and sold abroad by tomb raiders (盗墓者).

1. The underlined word "banished" in Paragraph 2 is closest in meaning to "      "

A. killed  

B. removed  

C. divorced  

D. persuaded 

2. The passage mainly focuses on          .

A. the life story of Wu Huifei.    

B. the reason why Wu Huifei was favoured by Tang Xuanzong

C. the scientific, historical and artistic value of the recovered sarcophagus of Wu Huifei.

D. the influence of Wu Huifei and her posthumous honor.

3. Which of the following descriptions about Wu Huifei is true according to the passage?

A. She wasn't made empress by Tang Xuanzong because of the opposition from the ministers.

B. She was born in 737 AD and died in 775 AD.

C. No other woman has a greater influence on Chinese history than she does.

D. Like many concubines, she was given much honor after her death.