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高壓直流模塊電源
大功率開(kāi)關(guān)型高壓直流電源廣泛應(yīng)用于靜電除塵、水質(zhì)改良、醫(yī)用X光機(jī)和CT機(jī)等大型設(shè)備。電壓高達(dá)50~l59kV,電流達(dá)到0.*以上,功率可達(dá)100kW。
自從70年代開(kāi)始,日本的一些公司開(kāi)始采用逆變技術(shù),將市電整流后逆變?yōu)?kHz左右的中頻,然后升壓。進(jìn)入80年代,高頻開(kāi)關(guān)電源技術(shù)迅速發(fā)展。德國(guó)西門子公司采用功率晶體管做主開(kāi)關(guān)元件,將電源的開(kāi)關(guān)頻率提高到20kHz以上。并將干式變壓器技術(shù)成功的應(yīng)用于高頻高壓電源,取消了高壓變壓器油箱,使變壓器系統(tǒng)的體積進(jìn)一步減小。
國(guó)內(nèi)對(duì)靜電除塵高壓直流電源進(jìn)行了研制,市電經(jīng)整流變?yōu)橹绷?采用全橋零電流開(kāi)關(guān)串聯(lián)諧振逆變電路將直流電壓逆變?yōu)楦哳l電壓,然后由高頻變壓器升壓,**整流為直流高壓。在電阻負(fù)載條件下,輸出直流電壓達(dá)到55kV,電流達(dá)到15mA,工作頻率為25.6kHz。
電力有源濾波器
傳統(tǒng)的交流-直流(AC-DC)變換器在投運(yùn)時(shí),將向電網(wǎng)注入大量的諧波電流,引起諧波損耗和干擾,同時(shí)還出現(xiàn)裝置網(wǎng)側(cè)功率因數(shù)惡化的現(xiàn)象,即所謂“電力公害”,例如,不可控整流加電容濾波時(shí),網(wǎng)側(cè)三次諧波含量可達(dá)(70~80)%,網(wǎng)側(cè)功率因數(shù)僅有0.5~0.6。
電力有源濾波器是一種能夠動(dòng)態(tài)抑制諧波的新型電力電子裝置,能克服傳統(tǒng)LC濾波器的不足,是一種很有發(fā)展前途的諧波抑制手段。濾波器由橋式開(kāi)關(guān)功率變換器和具體控制電路構(gòu)成。與傳統(tǒng)開(kāi)關(guān)電源的區(qū)別是:(l)不僅反饋輸出電壓,還反饋輸入平均電流; (2)電流環(huán)基準(zhǔn)信號(hào)為電壓環(huán)誤差信號(hào)與全波整流電壓取樣信號(hào)之乘積。
PLC控制系統(tǒng)硬件設(shè)計(jì)方法應(yīng)用系統(tǒng)總體方案設(shè)計(jì)
1．PLC控制系統(tǒng)類型F 由PLC構(gòu)成的單機(jī)控制系統(tǒng)。F 由PLC構(gòu)成的集中控制系統(tǒng)。F 由PLC構(gòu)成的分布式控制系統(tǒng)。
F 用PLC構(gòu)成遠(yuǎn)程I／0控制系統(tǒng)。2．系統(tǒng)的運(yùn)行方式F 手動(dòng)運(yùn)行方式。F 半自動(dòng)運(yùn)行方式。F 自動(dòng)運(yùn)行方式。
二 系統(tǒng)硬件設(shè)計(jì)根據(jù)1．工藝要求2．設(shè)備狀況3．控制功能4．I／0點(diǎn)數(shù)和種類5．系統(tǒng)的先進(jìn)性
三 可編程序控制器的機(jī)型選擇1. CPU的功能2. I/0點(diǎn)數(shù)3. 響應(yīng)速度4. 指令系統(tǒng)5. 機(jī)型選擇的其他考慮
四 輸入/輸出模板的選擇1．?dāng)?shù)字量輸入模塊的選擇2．?dāng)?shù)字量輸出模塊的選擇3．模擬量模塊的選擇4．智能I／0模塊的應(yīng)用選擇
五 系統(tǒng)硬件設(shè)計(jì)文件1．系統(tǒng)硬件配置圖2．模塊統(tǒng)計(jì)表3．I／0硬件接口圖及I／0地址表
六 系統(tǒng)供電設(shè)計(jì)1．供電系統(tǒng)的保護(hù)措施2．電源模塊的選擇4． I／0模塊供電電源設(shè)計(jì)5. 系統(tǒng)接地設(shè)計(jì)6. 可編程序控制器供電系統(tǒng)設(shè)
7. 電纜設(shè)計(jì)和敷設(shè)延時(shí)中斷OB 20 ——西門子S7-300PLC組織塊OB及其應(yīng)用由調(diào)用SFC 32啟動(dòng)．調(diào)用SFC 32時(shí)要提供實(shí)參。OB-NR 延時(shí)中斷OB的號(hào)碼DTIME 延時(shí)長(zhǎng)度（1至60000ms）SIGN 延時(shí)OB被調(diào)用時(shí)進(jìn)入OB的啟動(dòng)信息標(biāo)志器RET-VAL OB 執(zhí)行過(guò)程中發(fā)生錯(cuò)誤時(shí)的錯(cuò)誤代碼處理延時(shí)中斷的SFCSFC32
SRT_TINT 啟動(dòng)延時(shí)中斷 SFC33
CAN_DINT 取消延時(shí)中斷SFC34
QRY_TINT 查詢延時(shí)中斷
I/A Series Advantage Upgrade Paths
From To (Lifecycle Phase) Adv. Upgrade Part / Model #s Description
CP10 FCP270 P270 The Field Control Processor 270 (FCP270) is a distributed, optionally fault-tolerant, field-mounted controller module. The FCP270 performs regulatory, logic, timing, and sequential control together with connected Fieldbus Modules (FBMs). It also performs data acquisition and alarm detection and notification. The FCP270 connects to the MESH control network via standard fiber optic 100 Mbps Ethernet. The fault-tolerant version of the FCP270 consists of two processor modules. These modules install in adjacent FCP270 slots in a baseplate for high speed communication between the modules. The unique and patented fault-tolerant operation of the FCP270 greatly imrpoves reliability relative to other process controllers. The fault-tolerant version of the FCP270 consists of two modules operating in parallel, with two Ethernet connections to the MESH control network. The two FCP270 modules, married together as a fault-tolerant pair, provide continuous operation of the controller in the event of virtually any hardware failure occurring within one module of the pair.
CP30A
CP30B
CP40A
CP40B
CP60
Micro I/A
CP10 ZCP270 P270 The Z-Module Control Processor 270 (ZCP270) is an optionally fault-tolerant, Z-form factor controller. The ZCP270 performs regulatory, logic, timing and sequential control together with connected Fieldbus Communications Modules (FCMs) and Fieldbus Modules. It also performs data acquisition and alarm detection notification. The ZCP270 connects to the MESH control network and FCM 100Ets/FCM100Es via standard fiber optic 100 Mbps Ethernet. The FCM100Et interfaces the 2 Mbps Module Fieldbus used by the 200 Series FBMs and the FCM100E interfaces the 2Mbps Module Fieldbus used by the 200 Series FBMs or the 268 Kbps Fieldbus used by the 100 Series FBMs. Depending on sizing considerations, the ZCP270 can be used with a mix of FCM100E and FCM100Et modules. The fault-tolerant version of the ZCP270 consists of two single-width processor modules. These modules install in adjacent ZCP270 slots in a 1x8 or 2x8 mounting structure and connect to a fault-tolerant connector to allow for high-speed communication between the modules.
資訊來(lái)源：廈門航拓電氣
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