IC200ALG431
IC200ALG431
工作方式:當(dāng)電流接通時(shí),繼電控制線路中各繼電器都處于受約狀態(tài),即該吸合的都應(yīng)吸合,不該吸合的都因受某種條件限制不能吸合。而PLC的控制邏輯中,各繼電器都處于周期性循環(huán)掃描接通之中,從宏觀上看,每個(gè)繼電器受制約接通的時(shí)間是短暫的。
控制速度:繼電控制邏輯依靠觸點(diǎn)的機(jī)械動(dòng)作實(shí)現(xiàn)控制,工作頻率低。觸點(diǎn)的開(kāi)閉動(dòng)作一般在幾十毫秒數(shù)量級(jí)。另外機(jī)械觸點(diǎn)還會(huì)出現(xiàn)抖動(dòng)問(wèn)題。而PLC是由程序指令控制半導(dǎo)體電路來(lái)實(shí)現(xiàn)控制的,速度極快,一般一條用戶指令的執(zhí)行時(shí)間在微秒數(shù)量級(jí)。PLC內(nèi)部還有嚴(yán)格的同步,不會(huì)出現(xiàn)抖動(dòng)問(wèn)題
限時(shí)控制:繼電控制邏輯利用時(shí)間繼電器的滯后動(dòng)作進(jìn)行限時(shí)控制。時(shí)間繼電器一般分為空氣阻尼式、電磁式、半導(dǎo)體式等,其定時(shí)精度不高,定時(shí)時(shí)間易受環(huán)境濕度和溫度變化的影響,調(diào)整時(shí)間困難。有些特殊的時(shí)間繼電器結(jié)構(gòu)復(fù)雜,不便維護(hù)。 PLC使用半導(dǎo)體集成電路作定時(shí)器,時(shí)基脈沖由晶體振蕩器產(chǎn)生,精度相當(dāng)高,定時(shí)范圍一般從0.1 s到若干分鐘甚至更長(zhǎng),用戶可根據(jù)需要在程序中設(shè)定定時(shí)值,然后由軟件和硬件計(jì)數(shù)器來(lái)控制定時(shí)時(shí)間,定時(shí)精度小于10 ms且定時(shí)時(shí)間不受環(huán)境的影響。
設(shè)計(jì)與施工:使用繼電控制邏輯完成一項(xiàng)控制工程,其設(shè)計(jì)、施工、調(diào)試必須依次進(jìn)行,周期長(zhǎng),而且修改困難。工程越大,這一點(diǎn)就越突出。而用PLC完成一項(xiàng)控制工程,在系統(tǒng)設(shè)計(jì)完成以后,現(xiàn)場(chǎng)施工和控制邏輯的設(shè)計(jì)(包括梯形圖和程序設(shè)計(jì))可以同時(shí)進(jìn)行,周期短,且調(diào)試和修改都很方便。
可靠性和可維護(hù)性:繼電控制邏輯使用了大量的機(jī)械觸點(diǎn),連線也多。觸點(diǎn)開(kāi)閉時(shí)會(huì)受到電弧的損壞,并有機(jī)械磨損,壽命短,因此可靠性和可維護(hù)性差。而PLC采用微電子技術(shù),大量的開(kāi)關(guān)動(dòng)作由無(wú)觸點(diǎn)的半導(dǎo)體電路來(lái)完成,它體積小、壽命長(zhǎng)、可靠性高。PLC還配備有自檢和監(jiān)督功能,能檢查出自身的故障,并隨時(shí)顯示給操作人員,還能動(dòng)態(tài)地監(jiān)視控制程序的執(zhí)行情況,為現(xiàn)場(chǎng)調(diào)試和維護(hù)提供了方便。
在電機(jī)功率很小時(shí),有時(shí)候電機(jī)的空載電流將超過(guò)電機(jī)額定電流的50%,而對(duì)于大功率的電機(jī),其空載電流還可能不到電機(jī)額定電流的20%,同步電機(jī)更低。同時(shí)電機(jī)極對(duì)數(shù)越多空載電流越大。
口訣是現(xiàn)場(chǎng)快速求算電動(dòng)機(jī)空載電流具體數(shù)值的口訣,它是眾多的測(cè)試數(shù)據(jù)而得。它符合"電動(dòng)機(jī)的空載電流一般是其額定電流的1/3"。同時(shí)它符合實(shí)踐經(jīng)驗(yàn):"電動(dòng)機(jī)的空載電流,不超過(guò)容量千瓦數(shù)便可使用"的原則(指檢修后的舊式、小容量電動(dòng)機(jī))。口訣"容量八折左右求"是指一般電動(dòng)機(jī)的空載電流值是電動(dòng)機(jī)額定容量千瓦數(shù)的0.8倍左右。中型、4或6極電動(dòng)機(jī)的空載電流,就是電動(dòng)機(jī)容量千瓦數(shù)的0.8倍;新系列,大容量,極數(shù)偏小的2級(jí)電動(dòng)機(jī),其空載電流計(jì)算按"新大極數(shù)少六折";對(duì)舊的、老式系列、較小容量,極數(shù)偏大的8極以上電動(dòng)機(jī),其空載電流,按"是小極多千瓦數(shù)"計(jì)算,即空載電流值近似等于容量千瓦數(shù),但一般是小于千瓦數(shù)。運(yùn)用口訣計(jì)算電動(dòng)機(jī)的空載電流,算值與電動(dòng)機(jī)說(shuō)明書(shū)標(biāo)注的、實(shí)測(cè)值有一定的誤差,但口訣算值完全能滿足電工日常工作所需求。
一般波峰焊機(jī)比較大,流水線生產(chǎn),但有些客戶比如實(shí)驗(yàn)室、學(xué)校、小型工廠需要小型的無(wú)鉛波峰焊機(jī).某電子設(shè)備廠開(kāi)發(fā)了這種產(chǎn)品,采用了永宏FBS 系列PLC 和Panelvisa 觸摸屏.該設(shè)備需要控制三個(gè)溫度,共三個(gè)PID,永宏FBS 系列PLC 最多實(shí)現(xiàn)8路PID,可以滿足該設(shè)備要求.再配上Panelvisa 觸摸屏,具有很高的性價(jià)比.
雙波峰焊機(jī)首先要把焊錫溫度、預(yù)熱溫度、預(yù)熱補(bǔ)償溫度共三個(gè)溫度加到設(shè)定的溫度值.當(dāng)條件成立后,整機(jī)就可以生產(chǎn)了.把PCB 板放到軌道上,按啟動(dòng)開(kāi)關(guān),傳輸電機(jī)運(yùn)行,氣泵啟動(dòng),噴助焊劑,PCB 板助焊劑的噴涂完成,延時(shí)氣泵停止.當(dāng)PCB 板到左邊預(yù)熱區(qū)后,傳輸電機(jī)停止,PCB 板停在預(yù)熱區(qū),預(yù)熱倒計(jì)時(shí),時(shí)間到后,傳輸電機(jī)啟動(dòng),PCB 板向右運(yùn)行,錫泵電機(jī)啟動(dòng)噴錫,PCB 板經(jīng)過(guò)預(yù)熱補(bǔ)償溫度區(qū),進(jìn)入了噴錫區(qū),過(guò)了噴錫區(qū)后,錫泵停止,當(dāng)PCB 板到右邊后,傳輸電機(jī)停止,冷風(fēng)電機(jī)啟動(dòng).這樣一個(gè)完整的循環(huán)就結(jié)束了.
1只要有堅(jiān)強(qiáng)的持久心, 一個(gè)庸俗平凡的人也會(huì)有成功的一天, 否則即使是一個(gè)才識(shí)卓越的人, 也只能遭遇失敗的命運(yùn).
2我們的產(chǎn)品均提供一年質(zhì)保,15天有任何質(zhì)量問(wèn)題包退換,做到讓您放心的購(gòu)買。
3如果你正在找或是需要用上我們的產(chǎn)品,千萬(wàn)不要錯(cuò)過(guò)。
4具體型號(hào)來(lái)電咨詢;充足的庫(kù)存、健全的網(wǎng)絡(luò)、完善的物流、優(yōu)惠的價(jià)格,只要你想要的。
5產(chǎn)品的質(zhì)量是未來(lái)公司生存下去的首要條件之一。
6成功者一遇到問(wèn)題就馬上動(dòng)手去解決. 他們不花費(fèi)時(shí)間去發(fā)愁, 因?yàn)榘l(fā)愁不能解決任何問(wèn)題, 只會(huì)不斷增加憂慮、浪費(fèi)時(shí)間。
聯(lián)系人:李濤(銷售一部經(jīng)理)電話:0591-62182520手機(jī):13696852881
聯(lián)系人:王工(銷售一部助理)電話:0591-62182535手機(jī):15506917382
傳真:059--62032566
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