電大機械本科【機電控制與可編程控制器技術(shù)設(shè)計】復(fù)習(xí)題小抄參考

1、設(shè)計題復(fù)習(xí)：題一、按起動按鈕sbi后，一臺三相交流電動機運轉(zhuǎn)10s，停止5s，重復(fù)動作3次后停止運轉(zhuǎn)；按下急停機按鈕sb2，電動機停止；過載時熱繼電器fr動作，電動機停止。按上述工作要求；（1）設(shè)計電機控制主回路； 2）選擇plc，設(shè)計plc控制回路；3）分配io 通道，畫出梯形圖。1：圖（a）為電機控制主回路，圖（b為控制回路，圖c為控制梯形圖、選cpm1a10點plc（也可以選其它型號plc）2： io點分配 啟動按鈕sbi 00000 急停按鈕sb2 00001 熱保護fr 00002 電機控制接觸器km1 001003梯形圖 如圖（c）題二：由兩臺三相交流電動機m1、m2。組成的控制系

2、統(tǒng)的工作過程是；按起動按鈕sb1，m1電動機起動，過5秒后m2電動機起動，按起動按鈕sb2，m2電動機起動；按停止按鈕sb3，m1、m2電動機停止；若m2電動機過載測兩臺電動機都應(yīng)停機，若m1電動機過載則m1電動機停機、按上述要求：（1）設(shè)計電機控制主回路；（2）選擇 plc，設(shè)計 plc控制回路（3）分配 io通道。畫出梯形圖。答： （設(shè)計出電機控制主回路5分；選plc和設(shè)計出plc控制回路5分；io點分配5分；設(shè)計出控制梯形圖5分。） 1圖（a）為電機控制主回路，圖(b)為plc控制電路。2選 cpmia 10點 plc（也可以選其它型號 plc）題三： 一臺三相交流電機驅(qū)動機床工作自前后

3、運動，sq1和sq2為限位開關(guān)，安裝在機床前后的預(yù)定位置上當(dāng)按下正向啟動按鈕 sb1，電動機正轉(zhuǎn)，機床工作臺向前運行，當(dāng)運行到終端位置時，裝在機床工作臺上的擋鐵（撞塊）碰撞限位開關(guān)sq1，電動機斷電停轉(zhuǎn)，機床工作臺停止運行；按下反向啟動按鈕sb2時，電動機反轉(zhuǎn)，機床工作臺向后運行，當(dāng)運行到終端位置時，裝在機床工作臺上的擋鐵（撞塊）碰撞限位開關(guān)sq2，電動機斷電停止，機床工作臺停止運行；停機時按下停機按鈕sb3，電動機停下來。過載時熱繼電器fr動作，電動機停止按上述工作要求：（1）設(shè)計電機控制主回路；（2）選擇plc，設(shè)計plc控制回路；（3）分配i/o 通道，畫出梯形圖題4：一臺三相交流電機驅(qū)

4、動機床工作自前后運動，sq1和sq2為限位開關(guān)，安裝在機床前后的預(yù)定位置上當(dāng)按下正向啟動按鈕 sb1，電動機正轉(zhuǎn)，機床工作臺向前運行，當(dāng)運行到終端位置時，裝在機床工作臺上的擋鐵（撞塊）碰撞限位開關(guān)sq1，電動機反轉(zhuǎn)，機床工作臺向后運行，當(dāng)運行到終端位置時，裝在機床工作臺上的擋鐵（撞塊）碰撞限位開關(guān)sq2，電動機反轉(zhuǎn)，機床工作臺向前運行，不斷往復(fù)運動斷電停止，停機時按下停機按鈕sb3，電動機停下來。過載時熱繼電器fr動作，電動機停止按上述工作要求：（1）設(shè)計電機控制主回路；（2）選擇plc，設(shè)計plc控制回路；（3）分配i/o 通道，畫出梯形圖。答案 題5：由兩臺三相交流電動機m1、m2組成的控

5、制系統(tǒng)的工作過程是：按起動按鈕，m1、m2電動機同時起動；接停止按鈕sb 2，m1電動機停止工作，延時5秒后m2電動機停止工作；若m2電動機過載則兩臺電動機都應(yīng)停機；若m1電動機過載，則m1電動機停機m2電動機不停機按上述要求：（1）設(shè)計電機控制主回路；（2）選擇plc，設(shè)計plc控制回路；（3）分配i/o 通道，畫出梯形圖。答：題6： 由兩臺三相交流電動機m1、m2組成的控制系統(tǒng)的工作過程是按起動按鈕sb1，m1電動機起動，m1電動機起動后按sb2，m2電動機起動（若m1電動機沒起動，則m2電動機不能起動）；按停止按鈕sb3，m2電動機停止，過5秒后m1電機停止；按急停按鈕sb4電動機m1、

6、m2停止；若m2電動機過載，則兩臺電動機都應(yīng)停機。 按上述要求：（1）設(shè)計電機控制主回路；（2）選擇plc，設(shè)計plc控制回路；（3）分配i/o 通道，畫出梯形圖。答 （設(shè)計出電機控制主回路5分選plc和設(shè)計出plc控制回路6分；i/o點分配5分；設(shè)計出控制梯形圖6分。） a圖。）為電機控制主回路，b圖）為plc控制電路。 2選cpmia10點plc（也可以選其它型號plc）題7： 接起動按sb1后，一臺三相交流電動機運轉(zhuǎn)10s，停止5s，重復(fù)動作3次后停止運轉(zhuǎn)；按下急停按鈕sb2電動機停止；過載時熱繼電器fr動作，電動機停止。 按上述要求； 1）設(shè)計電機控制主回路； （2）選則plc，設(shè)計p

7、lc控制回路（3）分配io通道，畫出梯形圖答：winger tuivasa-sheck, who scored two tries in the kiwis 20-18 semi-final win over england, has been passed fit after a lower-leg injury, while slater has been named at full-back but is still recovering from a knee injury aggravated against usa.both sides boast 100% records hea

8、ding into the encounter but australia have not conceded a try since josh charnleys effort in their first pool match against england on the opening day.aussie winger jarryd hayne is the competitions top try scorer with nine, closely followed by tuivasa-sheck with eight.but it is recently named rugby

9、league international federation player of the year sonny bill williams who has attracted the most interest in the tournament so far.the kiwi - with a tournament high 17 offloads - has the chance of becoming the first player to win the world cup in both rugby league and rugby union after triumphing w

10、ith the all blacks in 2011.id give every award back in a heartbeat just to get across the line this weekend, said williams.the (lack of) air up there watch mcayman islands-based webb, the head of fifas anti-racism taskforce, is in london for the football associations 150th anniversary celebrations a

11、nd will attend citys premier league match at chelsea on sunday.i am going to be at the match tomorrow and i have asked to meet yaya toure, he told bbc sport.for me its about how he felt and i would like to speak to him first to find out what his experience was.uefa hasopened disciplinary proceedings

12、 against cskafor the racist behaviour of their fans duringcitys 2-1 win.michel platini, president of european footballs governing body, has also ordered an immediate investigation into the referees actions.cska said they were surprised and disappointed by toures complaint. in a statement the russian

13、 side added: we found no racist insults from fans of cska. baumgartner the disappointing news: mission aborted.the supersonic descent could happen as early as sunda.the weather plays an important role in this mission. starting at the ground, conditions have to be very calm - winds less than 2 mph, w

14、ith no precipitation or humidity and limited cloud cover. the balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. it will climb higher than the tip of mount everest (5.5 miles/8.85 kilometers), drifting even higher

15、 than the cruising altitude of commercial airliners (5.6 miles/9.17 kilometers) and into the stratosphere. as he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.the balloon will slowly drift to the edge of space at 120,000 feet ( then, i would assume, he will slow

16、ly step out onto something resembling an olympic diving platform.they blew it in 2008 when they got caught cold in the final and they will not make the same mistake against the kiwis in manchester.five years ago they cruised through to the final and so far history has repeated itself here - the last

17、 try they conceded was scored by englands josh charnley in the opening game of the tournament.that could be classed as a weakness, a team under-cooked - but i have been impressed by the kangaroos focus in their games since then.they have been concentrating on the sort of stuff that wins you tough, e

18、ven contests - strong defence, especially on their own goal-line, completing sets and a good kick-chase. theyve been great at all the unglamorous stuff that often goes unnoticed in the stands but not by your team-mates.it is as though their entire tournament has been preparation for the final.in johnathan thurston, cooper cronk, cameron smith and either billy slater or greg inglis at full-back they have a spine that is unmatched in rugby league. they have played in so many high-pressure games - a pricele