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MKS 1480A
發(fā)布者:fzjfx0001  發(fā)布時(shí)間:2019-08-15 15:42:37

MKS 1480A現(xiàn)貨 in stock! 歡迎來電咨詢~?。?/p>

MKS 1480A


 廣州地鐵三號(hào)線集中冷站系統(tǒng)構(gòu)成及特點(diǎn)
  廣州地鐵三號(hào)線集中冷站采用了施耐德高端PL C QUANTUM 控制器系列,對(duì)集中冷站和車站進(jìn)行控制,各車站與集中冷站之間采用多模光纖以太網(wǎng)通訊方式,通訊協(xié)議為MODBUS TCP .大大保證了通訊速率和通訊信息量的要求,同時(shí)也保證了通訊距離和系統(tǒng)的安全可靠性。送排風(fēng)及空調(diào)系統(tǒng)采用變頻器調(diào)節(jié)風(fēng)量,水系統(tǒng)二次泵也均采用變頻器調(diào)節(jié)。變頻器與通過Modbus通訊接口接入就地遠(yuǎn)程I/O箱的遠(yuǎn)程通訊模塊上,大大減少了通訊線的距離,避免了干擾。
  ● 集中冷站系統(tǒng)構(gòu)成
  ○ 集中冷站供冷系統(tǒng)由集中冷站,傳輸管道和末端設(shè)備構(gòu)成
  ○ 其中供冷系統(tǒng)圖如圖1-1,冷站系統(tǒng)圖如圖1-2
集中冷站系統(tǒng)特點(diǎn)
  與分站供冷方式相比,集中冷站供冷系統(tǒng)需要為多個(gè)車站供冷,在供冷范圍和數(shù)量上都要大得多,有以下幾個(gè)主要特點(diǎn):
  ● 冷凍水傳輸距離長(zhǎng)。一般地鐵站距在1000米左右,本系統(tǒng)為6個(gè)車站供冷,冷凍水傳輸距離將達(dá) 2000~3000米。長(zhǎng)距離傳輸,管路的阻力大為增加,并且系統(tǒng)的熱惰性加大,增大了系統(tǒng)的調(diào)節(jié)難度
  ● 末端設(shè)備數(shù)量多,供冷管路形成網(wǎng)絡(luò)。由于各站的負(fù)荷情況不同,系統(tǒng)調(diào)節(jié)時(shí)易導(dǎo)致出現(xiàn)相互影響,需考慮整個(gè)網(wǎng)絡(luò)的整體水力平衡
  ● 集中冷站供冷系統(tǒng)的制冷部分,通常采用多機(jī)組,二級(jí)泵的形式。這種形式適應(yīng)了長(zhǎng)距離管路輸送阻力較大的情況,能夠減小末端系統(tǒng)對(duì)冷機(jī)的影響。但是增加了泵的數(shù)量和管路復(fù)雜性,使調(diào)節(jié)控制的難度加大
  調(diào)節(jié)控制方法與策略
  調(diào)節(jié)控制手段
  ● 廣州地鐵三號(hào)線集中供冷系統(tǒng)中,PLC采用的調(diào)節(jié)控制手段有:
  ○ 風(fēng)機(jī)變頻變風(fēng)量(末端設(shè)備)
  ○ 水泵變頻變水量
 ○ 水閥調(diào)水量
  ○ 質(zhì)調(diào)節(jié)
  調(diào)控手段的選擇
  由于管路很長(zhǎng),冷凍水從集中冷站到末端設(shè)備需要運(yùn)行數(shù)十分鐘,如果采用質(zhì)調(diào)節(jié),則調(diào)節(jié)時(shí)滯太大。因此在實(shí)時(shí)控制中,主要采用量調(diào)節(jié)的方式(包括風(fēng)量調(diào)節(jié)和水量調(diào)節(jié))。質(zhì)調(diào)節(jié)則采用開環(huán)方式,根據(jù)外溫或季節(jié)確定冷凍水溫,并在一定時(shí)間內(nèi)(比如1天內(nèi))保持相對(duì)穩(wěn)定。
  二級(jí)泵管路長(zhǎng),阻力大,且流量直接受末端負(fù)荷的影響,因此二級(jí)泵采用變頻調(diào)節(jié),可以達(dá)到較好的節(jié)能效果。同時(shí)為了保證通過冷水機(jī)組的水量,一級(jí)泵采用定速泵,并與冷機(jī)對(duì)應(yīng)運(yùn)行,不進(jìn)行變頻調(diào)節(jié)。
  從節(jié)能的角度考慮,優(yōu)先考慮節(jié)能效果較好的風(fēng)機(jī)變頻和水泵變頻調(diào)節(jié),盡量少使用水閥調(diào)水量的方法。
  控制調(diào)節(jié)的策略
  初調(diào)節(jié)
  集中冷站供冷的管路復(fù)雜,不同支路之間的阻力差距大,因此需要進(jìn)行認(rèn)真的系統(tǒng)初調(diào)節(jié),以免系統(tǒng)水力失調(diào),導(dǎo)致運(yùn)行調(diào)節(jié)無法正常進(jìn)行。
  ● 初調(diào)節(jié)目標(biāo):
  ○ 驗(yàn)證系統(tǒng)可以達(dá)到設(shè)計(jì)工況
  ○ 實(shí)現(xiàn)系統(tǒng)的水力平衡,為運(yùn)行調(diào)節(jié)準(zhǔn)備條件。
  ● 調(diào)節(jié)步驟
  經(jīng)多次調(diào)整,使系統(tǒng)內(nèi)各機(jī)組的流量基本相同(如機(jī)組型號(hào)不同,則各機(jī)組的流量比值應(yīng)基本相同。流量比值=實(shí)際流量/設(shè)計(jì)流量)。且至少1個(gè)機(jī)組的閥門為全開狀態(tài)。
  1、調(diào)整一級(jí)泵系統(tǒng)水力平衡
  2、設(shè)計(jì)頻率整定

MODICON MM-PM21-200 USPP MMPM21200

ASEA BROWN BOVERI 57771224 NSFP 57771224

ALLEN BRADLEY 1336VT-B025-EOP-FA2-L1 USPP 1336VTB025EOPFA2

COOPER INDUSTRIES 927255 NSPP 927255

PACIFIC SCIENTIFIC SC723B001-01 USPP SC723B00101

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ABB 57773677 Mem86-E Mem86-128K AB Stromberg

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8510A-A1 ALLEN BRADLEY DRIVES REMANUFACTURED

SIEMENS 6RA7078-6DS22-0 USPP 6RA70786DS220

ATLAS COPCO 2101-S4-115R USPP 2101S4115R

ASEA BROWN BOVERI AF460-30-11 USPP AF4603011

MITSUBISHI MRJ2S11KA NSFP MRJ2S11KA

INDRAMAT MAC112C-0-HD-4-C/130-A-0/WI518LV/S021 NSPP MAC112C0HD4C130A

APW MCLEAN 13-0116-G0014 USPP 130116G0014

TELEMECANIQUE VZ3-IM2400M1202 USPP VZ3IM2400M1202

Siemens 6ES5-436-7LA11 NSFP 6ES54367LA11

SIEMENS 6ES5 482-8MA12S5

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MKS 1480A

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ALLEN BRADLEY 1756-DMA31 NSFP 1756DMA31

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SIEMENS Sinumerik CPU Module 6FX1120-4BD03 E Stand A

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SIEMENS CONTROLLER CARD 6SN1118-0DM23-0AA0

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(N2-3) 1 DATA PRODUCTS 30750732 MEMORY CARD N2-3

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ALLEN BRADLEY 1336-B040-EJ6-FJ3-L1 USPP 1336B040EJ6FJ3L1

GE FANUC IC600LX680 NSPP IC600LX680

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RELIANCE ELECTRIC 2GU41010 USPP 2GU41010

SIEMENS 6ES7-157-0AC80-0XA0 NSPP 6ES71570AC800XA0

Siemens 6ES5 470-4UB12 6ES54704UB12

Siemens 6ES5945-7UA13 6ES5 945-7UA13 CPU945 S5-115U Processor 60 DAYS WARRANTY

SIEMENS 6ES5-440-8MA11 NSFP 6ES54408MA11

Siemens 6ES5 755-4AA11 SINEC H1 N TYPE COAX CON /BOX

Siemens S5 6ES5 943-7UA22 6ES59437UA22 CPU Module

SIEMENS C98043-A1035-L5

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Square D 8020 SMM-115

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WS-C3560-48PS-S CISCO 3560-48PS SWICTH W/1 YR -WSC356048PSS Fast Shipp

Siemens 6ES7314-1AE04-0AB0

Siemens Simodrive 611 6SN1118-0NJ01-0AA1

Reliance F-014962

Schneider Modicon AS-P933-000 POWER SUPPLY ASP933000

Schneider Modicon AS-B545-000 NSFP ASB545000

Schneider Modicon AS-W512-003 USPP ASW512003

Schneider Modicon AS-BDEP-209 PLC

Schneider Modicon AS-B825-016 24vdc Input Module C PICS

MODICON AS-8228-100 NSPP AS8228100

SIEMENS HTRI-D DUAL INPUT MODULE

SHARP ZW-32IO2 USPP ZW32IO2

SIEMENS OPERATOR INTERFACE PMU 6SE7090 0XX84 2FA0 2FAO

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SIEMENS 6SN1118-0NH00-0AA2 6SN11180NH000AA2

SIEMENS Simatic Simodrive Card C98040-A1087. .

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TELEMECANIQUE ATV-58HD33N4ZU NSPP ATV58HD33N4ZU

EDWARDS MC4160-C14 NSFP MC4160C14

CUTLER HAMMER 92-00414-02 USPP 920041402

PFANNENBERG 13310911200 NSFP 13310911200

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Schneider Modicon AS-P230-000 USPP ASP230000

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Schneider Modicon AS-8534-000 High/Low Density Connector -

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SIEMENS SIMATIC S7 DIGITAL INPUT MODULE 6ES7421-1BL01-0AA0

Siemens 6ES7 334-0KE00-0AB0 -FS- 6ES73340KE000AB0

 

來源:工控備件
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