ICS Triplex T8871現(xiàn)場輸入輸出模塊現(xiàn)貨

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型號(hào)：T8871
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優(yōu)勢品牌：Allen Bradley、BentlyNevada、ABB、Emerson Ovation、Honeywell DCS、Rockwell ICS Triplex、FOXBORO、Schneider PLC、GE Fanuc、Motorola、HIMA、TRICONEX、Prosoft等各種進(jìn)口工業(yè)零部件

ICS Triplex T8871現(xiàn)場輸入輸出模塊現(xiàn)貨

該系統(tǒng)選用FR-500日本三菱變頻器。該系統(tǒng)中具有功能：
1自動(dòng)切換變頻/工頻運(yùn)行功能
變頻器提供三種不同的工作方式供用戶選擇：
方式0：基本工作方式。變頻器始終固定驅(qū)動(dòng)一臺(tái)泵并實(shí)時(shí)根據(jù)其輸出頻率：控制其他輔助泵啟停。即當(dāng)變頻器的輸出頻率達(dá)到大頻率時(shí)啟動(dòng)一臺(tái)輔助泵工頻運(yùn)行、當(dāng)變頻器的輸出頻率達(dá)到小頻率時(shí)則停止后啟動(dòng)的輔助泵。由此控制增減工頻運(yùn)行泵的臺(tái)數(shù)。
方式1：交替方式,變頻器通常固定驅(qū)動(dòng)某臺(tái)泵,并實(shí)時(shí)根據(jù)其輸出頻率,使輔助泵工頻運(yùn)行,此方式與方式0不同之處在于若前一次泵啟動(dòng)的順序是泵1→泵2,當(dāng)變頻器輸出停止時(shí),下一次啟動(dòng)順序變?yōu)楸?→泵1。
方式2：直接方式。當(dāng)啟信號(hào)輸入時(shí)變頻器啟動(dòng)一臺(tái)泵當(dāng)該泵達(dá)到高頻率時(shí),變頻器將該泵切換到工頻運(yùn)行,變頻器啟動(dòng)下一臺(tái)泵變頻運(yùn)行,相反當(dāng)泵停止條件成立時(shí),先停止先啟動(dòng)的泵。
2　PID的調(diào)節(jié)功能
由壓力傳感器反饋的水壓信號(hào)(4-20MA或-5V)直接送入PLC的A/D口(可以通過手持編程器),設(shè)定給定壓力值,PID參數(shù)值,并通過PLC計(jì)算何以需切換泵的操作完成系統(tǒng)控制,系統(tǒng)參數(shù)在實(shí)際運(yùn)行中調(diào)整,使系統(tǒng)控制響應(yīng)趨于完整。
3“休眠”功能
系統(tǒng)運(yùn)行時(shí)經(jīng)常會(huì)遇到用戶用水量較小或不用水(如夜晚)情況,為了節(jié)能,該系統(tǒng)專用設(shè)置了可以使水泵暫停工作的“休眠”功能,當(dāng)變頻器頻率輸出低于其下限時(shí),變頻器停止工作,2#、3#泵不工作,水泵停止(處于休眠狀態(tài))。當(dāng)水壓繼續(xù)升高時(shí)將停止1泵,當(dāng)水壓下降到一定值時(shí)將先啟動(dòng)變頻器運(yùn)轉(zhuǎn)2#泵或3#泵,當(dāng)頻率到達(dá)一定值后將啟動(dòng)1#泵調(diào)節(jié)2#或3#泵的轉(zhuǎn)速。
“休眠值”變頻器輸出的下限頻率PR507設(shè)置。
“休眠確認(rèn)時(shí)間”用參數(shù)PR506設(shè)置,當(dāng)變頻器的輸出頻率低于休眠值的時(shí)間如小于休眠時(shí)間td時(shí),即tdtn時(shí)變頻器將進(jìn)入休眠狀態(tài)。“喚醒值”由供水壓力下限啟動(dòng),當(dāng)供水壓力低于下限值時(shí)由PLC發(fā)出指令喚醒變頻器工作。
經(jīng)測試“休眠值”為10HZ
“休眠確認(rèn)時(shí)間”td:20s
“喚醒值”70%
4通訊功能
該系統(tǒng)具有計(jì)算機(jī)的通訊功能,PLC變頻器均提供有RS232或485接口PLC可選用西門子的S7-200計(jì)算機(jī)可以與一套或多套系統(tǒng)進(jìn)行通訊,利用計(jì)算機(jī)同時(shí)可以監(jiān)測：電流、電壓、頻率、轉(zhuǎn)速、壓力等也可以控制變頻器的各類參數(shù)。
此外該系統(tǒng)還具有手動(dòng)/自動(dòng)操作,故障報(bào)警,運(yùn)行狀態(tài),電流,電壓、頻率狀態(tài)顯示缺水保護(hù)等功能。
運(yùn)行特征
以三臺(tái)水泵的恒壓供水系統(tǒng)為例,系統(tǒng)在自動(dòng)運(yùn)行方式下,可編程控制器控制變頻器軟啟動(dòng)1#泵,此時(shí)1#泵進(jìn)入變頻運(yùn)行狀態(tài),其轉(zhuǎn)速逐漸升高,當(dāng)供水量Q<1/3Qmax時(shí)(Qmax為三臺(tái)水泵全部工頻運(yùn)行時(shí)的大流量),可編程控制器CPU根據(jù)根據(jù)供水量的變化自動(dòng)調(diào)節(jié)1#泵的運(yùn)行轉(zhuǎn)速,以保證所需的供水壓力。當(dāng)用水量Q在1/3Qmax 當(dāng)外供水量減少至1/3Qmax 5.系統(tǒng)經(jīng)濟(jì)效益分析及系統(tǒng)優(yōu)點(diǎn) 1經(jīng)濟(jì)效益分析變量泵的功率N1、供水量Q1與泵轉(zhuǎn)速n　1三者的關(guān)系如下式：N1/Q1=(n　1/n)3 Q1/Q=　n　1/n 式中Q—額定流量,Q1N—額定流量Q時(shí)的軸功率 n—水泵的額定轉(zhuǎn)速因額定流量Q=100%時(shí),n=100%,N=100%,若n　1=90%n時(shí)Q1=90%Q,N1=72.9%N,即可節(jié)電27.1%。若n　1=80%n時(shí)Q1=80%Q,N1=51.2%N,即可節(jié)電48.8%。The LED interface and button on the device can ensure simple and direct parameterization setting, and realize flexible and applicable to a wide range of applications. In addition, the integrated output protected by eFuse can also reduce wiring work and support the use of smaller cable cross-sectional area. For users, this can further improve their flexibility and reduce costs, especially in intensive applications.The packaging material itself will absorb moisture or gases in the atmosphere, especially under high temperature storage. Epoxy resin potting materials are usually very hard and highly chemically inert, but silicone or polyurethane materials are often softer and porous. Therefore, the porosity of the latter will allow moisture or oxygen in the atmosphere to enter the internal devices, causing corrosion effect and mechanical expansion, thus destroying the sealing layer between the pins or shells, allowing moisture to further penetrate. The integrity of the seal can be confirmed by the penetration test of UV fluorescent dye (Fig. 2). In this test, the device is immersed in water-based dye under high pressure for a period of time to check whether any liquid will penetrate any tiny cracks, pores or poorly sealed places. Then remove the device and place it under the UV lamp. Any liquid penetration will be invisible under the fluorescence of the dye. In order to improve the reliability of switching power supply products, the switching power supply will design the output overvoltage protection function to prevent the output voltage from rising after a component inside the product is damaged. The load on the back end of the power supply can only bear a certain voltage. Once the output voltage rises, it will damage the load on the back end of the power supply. In order to prevent this problem, the switching power supply will design the output overvoltage protection circuit, so as to improve the reliability of the system. In the circuit, once the pull-down resistor R2 is short circuited, according to the calculation formula,

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ICS Triplex T8871現(xiàn)場輸入輸出模塊現(xiàn)貨

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