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A16B-1200-0220,

A16B-1200-0220

該體系采用PLC作為操控中心，完成PID閉環運算、多泵上下行切換、顯示、故障確診等功用，由變頻器調速方法主動調理水泵電機轉速，達到恒壓供水的意圖。

　　一、前語

　　跟著操控技術的發展與完善，變頻器及PLC在各個行業的使用愈來愈廣，PLC與變頻器的可靠性與靈活性得到了用戶的認可。一起傳統的水塔供水方法暴露了許多缺點：水的二次污染，用水高低峰的不平衡，管道閥門易損壞，維修保養費用過高等等。在此條件下各種恒壓供水方法應運而生，其間由變頻器、PLC操控的方法尤為遍及，這種方法的特色：體系穩定，功用強大，變頻器用于供水更加節能，所以廣泛使用在多層住宅小區生活消防供水體系中，現在許多場合也有使用，比方中央空調體系、供水加壓站、集中供熱等，這種方法經受了時刻的考驗，已有許多的使用實例。本文介紹的體系在寶雞某電廠家屬區已從98年運轉至今，體系穩定，性能可靠，得到了用戶的必定和好評。

　　二、體系組成：

　　1、體系概述：

　　該體系由四臺大泵(22KW)與一臺小泵(5.5KW)組成;PLC部分由西門子可編程操控器S7-200系列的CPU226，文本顯示器TD200組成;變頻器采用三菱FR-A540系列，功率22KW。

　　用戶所需的生活用水壓力、消防用水壓力、運轉方法等參數在TD200文本顯示器上設定，壓力傳感器把用戶管網壓力轉換為0-10V標準信號送進PLC模擬量模塊EM235，PLC經過采樣程序及PID閉環程序與用戶設定壓力構成閉環，運算后轉換為PLC模擬量輸出信號送給變頻器，調理水泵電機轉速，達到恒壓供水的意圖。

　　該體系有各個泵的運轉時刻累計功用，經過PLC的數據區保持可以斷電回憶。每次起動時先起動1#小泵，當用水量超越一臺泵的供水能力時，PLC經過程序完成泵的延時上行切換，切換原則為當前未運轉的大泵累計運轉時刻最少的先投入;當壓力超越時，PLC經過程序完成泵的延時下行切換，切換原則為當前正在運轉的大泵運轉時刻最多的先撤出。直到滿足設定壓力為止。尋求的最終目標為壓力恒定。

　　當供水負載變化時，變頻器的輸出電壓與頻率變化主動調理泵的電機轉速，完成恒壓供水。

　　體系還可經過PLC的實時時鐘主動守時供水，用戶在TD200上設定每天最多6段(段數也可設定)守時供水，比方早上6：00到8：30，中午11：20到1：30等。

　　體系可動態顯示各種參數，如設定壓力，運轉壓力，水位高度，運轉方法，實時時刻，日歷，各個泵的運轉時刻累計(準確到秒)，運轉狀況，故障信息等等。為了不使體系中TD200畫面顯得呆板，在PLC程序中操控TD200中的畫面守時切換，動態顯示;

　　體系還有故障自確診功用，各泵發作過載、缺相、短路、傳感器斷線、傳感器短路、水位下限、水壓超高、水壓超低、變頻器故障等，都會有聲光報警，TD200上一起顯示故障類型，告訴設備維修人員處理，并可回憶故障發作時刻及班次，以便追查原因及相關責任。

　　2、作業原理：主動手動方法

　　(1)手動運轉時，可按下按鈕起動中止水泵在工頻狀況下運轉，徹底脫離開PLC及變頻器的操控，該功用首要用在檢修及主動體系出現故障時的應急供水方法中。

　　(2)主動運轉時，悉數泵的運轉依程序主動作業。

　　上行過程：當在主動運轉方法時，按下TD200上的起動軟健，體系先起動1#小泵，PLC程序操控模擬量模塊EM235給定變頻器一固定頻率輸出，此時若用 PID運算輸出直接操控變頻器則(設定壓力大，運轉壓力為零，所以運算輸出最大)變頻器依設定的上升時刻運轉，升速太快，體系沖擊很大。等泵運轉一會兒，管網壓力堆集后，再用PID運算輸出操控變頻器。具體時刻和頻率與管網體系有關，在現場調試時這兩個參數在TD200上設定調整。管網越大，時刻越長。

　　當 1#小泵達到50HZ后，體系壓力仍偏低，則延時一段時刻后，體系靠PLC程序把1#泵切換到工頻運轉，一起由PLC輸出一個開關量給變頻器的MRS端子，變頻器瞬間制止輸出，此時PLC把運轉時刻最少的泵變頻接觸器接通后，撤掉制止輸出，相應的泵變頻起動運轉;延時切斷1#小泵，體系中相應的一臺大泵變頻運轉，壓力主動調理，若體系壓力平衡，則頻率穩定在一個相對的規模，若頻率達到50HZ后壓力依然偏低，則再投入一臺大泵，比較剩下的泵的累計運轉時刻，時刻少的先行投入，以此類推。注意，上行中，只要有一臺大泵運轉，則1#小泵要斷開，大泵與小泵一起運轉時，小泵的功率很低。

　　下行過程：當體系壓力偏高，變頻器運轉在18HZ左右(18HZ以下泵的功率很低，經驗值)時，PLC程序判斷運轉在工頻狀況的泵累計運轉時刻(若只有一臺泵不作判斷)，運轉時刻最多的泵延時先行撤出，在撤出的瞬間，PLC操控變頻器運轉頻率在50HZ，要不體系沖擊過大，簡單有水垂現象，延時一會兒后，再把 PID運算輸出投入即可;以此類推。注意：下行過程中，到最后一臺大泵運轉時，頻率在18HZ左右，體系壓力依然偏高時，則把1#小泵切換到變頻運轉。這種情況在夜間或許發作，當供水管網很大時，也許沒有這個或許性。

　　三、注意事項：

　　1、該體系中有泵的工頻變頻上行切換，為了體系的快速響應，切換時刻最好越短越好，切換時時刻差很小，所以各個泵的變頻接觸器與工頻接觸器最好用可逆接觸器，電氣線路與PLC程序中也要有互鎖功用。避免發作意外短路事端。對體系或變頻器形成危害。

　　2、變頻器上行下行切換時刻設定，假如設定值過大，則體系不能迅速對管網的用水量做出反應;假如設定值過小，則或許引起體系頻繁的投入泵，撤出泵的動作;為此，PLC程序中增加判斷設定壓力與運轉壓力在臨界切換狀況時，只要不超越答應的誤差規模內，不做泵的切換。

　　3、變頻器在上行切換時，必須要有瞬間制止輸出功用，變頻器沒有此功用可用自在停車功用;所以選擇變頻器時要注意這點。

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140CFD03200 Quantum CABLEFAST,數字輸入塊,2線或3線,單獨保險

294E-FD2P5P-G1-3 Variable Frequency Drive

WLNJ 觸點：1開1閉10A機械壽命：1500萬次?撞壓式?卷簧型

1492-SPM3B320 MCB Supplementary Protector 32 A

軟啟動器 3RW40372BB15

中央處理單元 6ES7 211-1HE40-0XB0 CPU 1211C DC/DC/RLY

150-F85NBD SMC Flex Smart Motor Controller

1734-IM2 POINT I/O 2 Point Digital Input Module

1783-ETAP 3 Port EtherNet/IP Tap

193-EPD E1 Plus Panel Mount Adaptor

20-750-EMC2-F45 PowerFlex 750 Size 4-5 Frm EMC Core Kit

2090-CPWM7DF-12AA40 MP-Series 40 m Length Power Cable

2098-DSD-030X Ultra 3000 3kW Servo Drive

GA646IFCLNTCRO005 GCA iFIX iClient Read Only 10 PK Keyless Runtime Version

GFK-2205 Programming Manual for Target ARS and IMC-D Series Controllers

IC220TBK084 I/O TERMINAL STRIP, 8 POSITION SPRING STYLE, AC OUTPUT-QTY 10

IC647G90C G90:GE Fanuc SNP

IC647SDEM SDE:Square D

IC693MDL645CA Conformal Coated Input module 24VDC 16 point POS/NEG logic

IC756DVE010J-98 EO GECK (Graphical Editor Construction Kit) - Intel x87, Japanese, Ver sion 9.8

MSI-QUAL-50-43 Quality Mang Clients 50 Pack-43

PLC-5/1771 System 1771-A4BK CONFORMALLY COATED, I/O CHASSIS ASSEMBLY 16 SLOT

Distributed I/O 1790D-T8BV8B DNET LDX 24VDC, 8 UNIV IN/8 SRCE OUT BASE TERM BLK

Communications 1770-CG RS-232C INTERFACE CABLE

Operator Interface 2727-G7P20D1P5 MOBILEVIEW GUARD G750

Support 9305-RSVADFCITR SUPT REINSTATEMENT CONTRACT FOR 9305RSVADFCIT

Support 9515-RSAAMPRDS SUPT RENEWAL CONTRACT FOR 9515RSAAMPRDENE

EtherNet/IP Products 2706-P42R INVIEW MESSGE DISPLAY. 1 OR 2 LINE, 12 OR 20 CHAR

RSI Software Products 9301-2SE3400PTE RSVIEW32 RUNTIME 32K (PORTUGUESE)

RSI Software Products 9515-RSCHM025ENE RSMACC CHANGE MGMT FOR UP TO 25 DEVICES

Motion Control 1326AB-B430E-S2L MOTOR,SERVO,460V,6.6NM,3000RPM,SINGL,IP67

3415-128-C Greyline OS, 4 Line, (20) 9MM Chars, VFD, Quick Connect, 128K Memory W/Clock/Date, NEMA 4

HMI-BEZ-204 BEZEL 6" STAINLESS STEEL

IC693ALG220 Analog Input, Voltage/Current, 4 Channels

QPL2D200C2P/B QUICKPANEL COLOR 12.1" TFT BLANK

TGT-E000-0-0 Target series rack expansion module with 10 foot rack linker cable

20BC5P0A3AYNACC0 PowerFlex 700 AC Drive 5 A at 2.2 kW 20B

20F1ANF012AN0NNNNN PowerFlex 753 AC Packaged Drive

22B-D4P0F104 PowerFlex 40 1.5 kW (2 Hp) AC Drive

140ACI04000C Quantum 模擬量輸入, 16通道, 高密度,CC

284E-FVD6P0Z-25-CR EtherNet Variable Frequency Drive

E2E-X10E1 10mm,電感式,三線,常開 200mA NPN電源:10-30VDC圓M30

1492-SPM1C040 MCB Supplementary Protector 4 A

通用型變頻器 6SE6 420-2UD15-5AA1 0.55 KW，73 x 173 x 149

電機啟動器 3VU13400NL00

1497D-A6-M14-0-N Gen Purpose Transformer

1608N-BP025A240V1 MiniDySC 25 Amp Bypass

1769-OW16 CompactLogix 16 Pt D/O Relay Module

190S-CND2-CC16D-TE 10-16 A Compact Comb Starter W/Ckt-Bkr

194R-NU100-1753 Disconnect non-fused NEMA 3 poles 100A

2090-CPBM7DF-16AF07 MP-Series 7m Cable

2090-XXTPMP-10S30 MP-Series 30 m Length Power Cable

CGGMP99901 GC GM PSRS