欠壓脫扣器11的線圈并聯(lián)在主電路上，當(dāng)線路電壓正常時(shí)，欠壓脫扣器產(chǎn)生的電磁吸力能夠克服彈簧9的拉力而將銜鐵10吸合，如果線路電壓降到某一值以下，電磁吸力小于彈簧9的拉力，銜鐵10被彈簧9拉開(kāi)，銜鐵撞擊杠桿7使搭鉤頂開(kāi)，則觸點(diǎn)2分?jǐn)嚯娐贰．?dāng)線路發(fā)生過(guò)載時(shí)，過(guò)載電流通過(guò)熱脫扣器的發(fā)熱元件13而使雙金屬片12受熱彎曲，于是撞桿7頂開(kāi)搭鉤，使觸點(diǎn)斷開(kāi)，從而起到過(guò)載保護(hù)作用。根據(jù)不同的用途，自動(dòng)開(kāi)關(guān)可配備不同的脫扣器。
再生過(guò)電壓保護(hù)。采用逆變器使電動(dòng)機(jī)快速時(shí)，由于再生功率直流電路電壓將升高，有時(shí)超過(guò)容許值?？梢圆扇⊥Ｖ鼓孀兤鬟\(yùn)轉(zhuǎn)或快速減速的辦法，防止過(guò)電壓。瞬時(shí)停電保護(hù)。對(duì)于數(shù)毫秒以內(nèi)的瞬時(shí)停電，控制電路工作正常。但瞬時(shí)停電時(shí)間在10s以上時(shí)，通常會(huì)使控制電路誤動(dòng)作，主電路也不能供電，所以檢出后使逆變器停止工作。
轉(zhuǎn)換作用在用電設(shè)備之間轉(zhuǎn)換或?qū)Φ蛪弘娖鳌⒖刂齐娐贩謺r(shí)投入運(yùn)行，以實(shí)現(xiàn)功能切換，如勵(lì)磁裝置手動(dòng)與自動(dòng)的轉(zhuǎn)換，供電的市電與自備電的切換等
F3LE01-5T 橫河PLC優(yōu)惠8
F3LE01-5T 橫河PLC優(yōu)惠8
福州卓凱電子科技有限公司
聯(lián)系人：程工
手機(jī)：15205082707
電話：0591-62182558
郵箱；340135333
傳真：0591-62032566 QQ:340135333
變頻器通電后無(wú)顯示，也是較常見(jiàn)的故障現(xiàn)象之一，引起這類故障原因，多數(shù)也是由于開(kāi)關(guān)電源的損壞所致。如MF系列變頻器的開(kāi)關(guān)電源采用的是較常見(jiàn)的反激式開(kāi)關(guān)電源控制方式，開(kāi)關(guān)電源的輸出級(jí)電路發(fā)生短路也會(huì)引起開(kāi)關(guān)電源損壞，從而導(dǎo)致變頻器無(wú)顯示。
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。
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PC10011 橫河PLC優(yōu)惠8
TSXCANCADD03
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UNIOPETT-VGA-0045
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1771-P4S/B電源模塊
IC200ALG320
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OMRONC60K-CDR-AUSPPC60KCDRA
1442-PS-0560E0010N
ALLENBRADLEY74103-160-511336T-GT2-SP4B/1336T-GT2-SP42B
AB1746-BASBASICMODULE
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140BP00600
IC697BEM733RR
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7ME3940-6BL02
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ALLENBRADLEY2711-B5A5PV5502711B5A5
BoschNAA35/1-DNr.:1070075122-205
1336F-AFB2A
PC10021
IC693CHS398RR
140G-H6C3-C40
安川伺服驅(qū)動(dòng)器放大器SGDS-04A12AY511
IC200MDL650E輸入模塊
CutlerELHFD3050L
7ML1998-1GL31
2711P-K6C8D
140CRA93200
140NOM21100
變頻器工作原理弄明白之前，不妨先看看變頻器究竟為何方神圣？
文字符號(hào)分為基本文字符號(hào)和輔助文字符號(hào)。文字符號(hào)適用于電氣技術(shù)領(lǐng)域中技術(shù)文件的編制，也可表示在電氣設(shè)備、裝置和元件上或其近旁以標(biāo)明它們的名稱、功能、狀態(tài)和特征
REXROTHLFA25GWA6X/A10?/12HYDRAULICCONTROLVALVE-NEW
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AS-S908-110
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HE660BGM424
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ALLEN-BRADLEY2711-B5A1XPANELVIEW550SCREENSER.FREV.FFRN.3.16TESTED!!
6ES5-102-8MA02
