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描述

140CPS11100

熔斷器是一種廣泛應(yīng)用的最簡單的有效的保護(hù)電器。在使用時(shí),熔斷器串接在所保護(hù)的電路中,當(dāng)電路發(fā)生短路或嚴(yán)重過載時(shí),它的熔斷體能自動(dòng)迅速地熔斷,從而切斷電路,使導(dǎo)線和電氣設(shè)備不致?lián)p壞。熔斷器主要由熔斷體(俗稱保險(xiǎn)絲)和熔座(俗稱保險(xiǎn)座)兩部分組成。熔斷體一般由熔點(diǎn)低、易于熔斷、導(dǎo)電性良好的合金材料制成。熔斷體為一次性使用元件,熔斷后,再次工作必須更換。

異步電動(dòng)機(jī)用變頻器調(diào)速運(yùn)轉(zhuǎn)時(shí)的結(jié)構(gòu)圖如圖1所示。通常由變頻器主電路(IGBT、BJT、或GTO做逆變?cè)┙o異步電動(dòng)機(jī)提供調(diào)壓調(diào)頻電源。此電源輸出的電壓或電源及頻率,由控制回路指令進(jìn)行控制。而控制指令則根據(jù)外部的運(yùn)轉(zhuǎn)指令進(jìn)行運(yùn)算獲得。對(duì)于需要精密速度或快速響應(yīng)的場(chǎng)合,運(yùn)算還應(yīng)包含由變頻器主電路和傳動(dòng)系統(tǒng)檢測(cè)出來的信號(hào)和保護(hù)電路信號(hào),即防止因變頻器主電路的過電壓,過電流引起的損壞外就,還應(yīng)保護(hù)異步電動(dòng)機(jī)及傳動(dòng)系統(tǒng)等。

額定頻率是指電動(dòng)機(jī)所接的交流電源每秒鐘內(nèi)周期變化的次數(shù),用fN表示。我國規(guī)定標(biāo)準(zhǔn)電源頻率為50Hz。
額定轉(zhuǎn)速表示三相電動(dòng)機(jī)在額定工作情況下運(yùn)行時(shí)每分鐘的轉(zhuǎn)速,用nN表示,一般是略小于對(duì)應(yīng)的同步轉(zhuǎn)速n1。如n1=1500r/min,則nN=1440r/min。
? ? 絕緣等級(jí)是指三相電動(dòng)機(jī)所采用的絕緣材料的耐熱能力,它表明三相電動(dòng)機(jī)允許的最高工作溫度。三相電動(dòng)機(jī)的絕緣等級(jí)和最高允許溫度。
? ? 定額是指三相電動(dòng)機(jī)的運(yùn)轉(zhuǎn)狀態(tài),即允許連續(xù)使用的時(shí)間,分為連續(xù)、短時(shí)、周期斷續(xù)三種。
? ? 連續(xù)工作狀態(tài)是指電動(dòng)機(jī)帶額定負(fù)載運(yùn)行時(shí),運(yùn)行時(shí)間很長,電動(dòng)機(jī)的溫升可以達(dá)到穩(wěn)態(tài)溫升的工作方式
? ? 短時(shí)工作狀態(tài)是指電動(dòng)機(jī)帶額定負(fù)載運(yùn)行時(shí),運(yùn)行時(shí)間很短,使電動(dòng)機(jī)的溫升達(dá)不到穩(wěn)態(tài)溫升;停機(jī)時(shí)間很長,使電動(dòng)機(jī)的溫升可以降到零的工作方式。
? ? 周期斷續(xù)工作狀態(tài)是指電動(dòng)機(jī)帶額定負(fù)載運(yùn)行時(shí),運(yùn)行時(shí)間很短,使電動(dòng)機(jī)的溫升達(dá)不到穩(wěn)態(tài)溫升;停止時(shí)間也很短,使電動(dòng)機(jī)的溫升降不到零,工作周期小于10min的工作方式。
? ? 三相電動(dòng)機(jī)定子繞組的連接方法有星形(Y)和三角形(△)兩種。定子繞組的連接只能按規(guī)定方法連接,不能任意改變接法,否則會(huì)損壞三相電動(dòng)機(jī)。
? ? 防護(hù)等級(jí)表示三相電動(dòng)機(jī)外殼的防護(hù)等級(jí),其中IP是防護(hù)等級(jí)標(biāo)志符號(hào),其后面的兩位數(shù)字分別表示電機(jī)防固體和防水能力。數(shù)字越大,防護(hù)能力越強(qiáng),中第一位數(shù)字“4”表示電機(jī)能防止直徑或厚度大于1毫米的固體進(jìn)入電機(jī)內(nèi)殼。第二位數(shù)字“4”表示能承受任何方向的濺水。

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NEW ROSEMOUNT 3051 DIFFERENTIAL PRESSURE TRANSMITTER

SOLID STATE BURNER MANAGEMENT – FIREYE 70D10, 120VAC

NEW AMAT APPLIED MATERIALS 114090164 HIGH VOLTAGE POWER

NEW FANUC A16B12120871 POWER SUPPLY DC R-J2 TYPE

YOKOGAWA ADMAG AM-115DN MAGNETIC FLOW DETECTOR 15MM

HONEYWELL Z MDA SCIENTIFIC CM4 TOXIC GAS MONITOR

NEW ROSEMOUNT 3051 GAGE PRESSURE TRANSMITTER

NEW BOC EDWARDS D37370761 IGX ACCESSORY MODULE ASM

PORTABLE CONDENSATE TANK 316ss 23″ DIAMETER 42″ HIGH

BRINKMANN KINEMATICA POLYTRON PT 3000 HOMOGENIZER MIXER

ALLEN BRADLEY 2706E23J16B1 OPERATOR INTERFACE 2LINE

GILSON 233XL ON-LINE COLUMN SWITCHING / AUTOSAMPLER

ALLEN BRADLEY 1785KE INTERFACE MODULE DATA HWY PLUS RS-

NEW HONEYWELL 51403299-200 LCNP4 W/ GUIDE GUS BOARD

HONEYWELL 51308386-175, CC-TDIL01 DIGITAL INPUT, IOTA

NEW ALLEN BRADLEY 160BA03SF1AFDSD?13D61 DRIVE 1 HP

ALLEN BRADLEY 2760-RB/A FLEXIBLE INTERFACE MODULE

NEW KEYENCE CV-301 COLOR VISION SYSTEM CONTROLLER

HONEYWELL CC-TDI120 DIGITAL INPUT IOTA HV 51308396-125

NEW HONEYWELL 51305430-100 LCNP4 W/O CARD GUIDE FOR GUS

NEW HONEYWELL 51403282-100 LCNP4 W/ CARD GUIDE FOR GUS

HONEYWELL 51305319-800 REV A GUS BOARD W/ GUIDE

HONEYWELL 51305319-800 REV A GUS BOARD W/O GUIDE

NEW HONEYWELL 51403282-200 LCNP4 W/ CARD GUIDE FOR GUS

NEW STI P4100B-2 SERIES OPTO SAFE LIGHT CURTAIN SYSTEM

NEW HONEYWELL 51402797-200 LCNP W/ GUIDE GUS BOARD

ALLEN BRADLEY 2755-L4RAA SCANNER MEDIUM SPEED

ALLEN BRADLEY 2755L7RD SCANNER HEAD SIDE FOR BAR CODE

NEW ALLEN BRADLEY 2755-L4FAA BAR CODE SCANNER

ORIENTAL MOTOR UDX5128N SERVO CONTROL STEPPING DRIVER

OMRON C1000H-CPU1-E2V?1 CPU UNIT

MICRISTAR MODEL 828 DIGITAL PROCESS CONTROLLER

NEW LINCOLN 82655 CENTROMATIC COMPONENT RAM PUMP

NEW FANUC A16B12120930 CONTROL BOARD E-STOP

JOHN & BARNES PORTABLE HYDRAULIC PUMP PUMPING SYSTEM

NEW BROOKFIELD TT100-140AYZ DRIVE SHAFT FOR VISCOMETER

NEW US ELECTRICAL MOTOR 100012-2703-0 30HP AC MOTOR

NEW ECD PHA351 ANALYZER/CALIBR?ATOR FULL PH TEST KIT

LAM RESEARCH ETCHER ? PART NUMBER 853-250589-001-?1-231S


選擇深圳長欣,選擇放心,售后無憂大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營:本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊(cè)”(不管能不能看懂,先了解個(gè)大概,以便學(xué)習(xí)編程時(shí)查找);
2、由位控邏輯入手,逐漸增加定時(shí)、計(jì)數(shù)等條件,把或、與、非關(guān)系理順;
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換;
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解(最好是有個(gè)物理回路驗(yàn)證,比如變頻器+電機(jī)+測(cè)速傳感器);
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制(盡量避免跳轉(zhuǎn),非跳不可時(shí)也是跳的越近越好);
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動(dòng)器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌,由于PLC的基本框架大同小異,學(xué)會(huì)一種至于其它的學(xué)習(xí)起來也就簡單了。