恒壓供水系統(tǒng) 全自動(dòng)恒壓供水控制原理 當(dāng)主水管網(wǎng)壓力傳感器的壓力信號(hào)4~20mA送給數(shù)字PID控制器，控制器根據(jù)壓力設(shè)定值與實(shí)際檢測(cè)值進(jìn)行PID運(yùn)算，并給出信號(hào)直接控制變頻器的轉(zhuǎn)速以使管網(wǎng)的壓力穩(wěn)定。當(dāng)用水量不是很大時(shí)，一臺(tái)泵在變頻器的控制下穩(wěn)定運(yùn)行；當(dāng)用水量大到變頻器全速運(yùn)行也不能保證管網(wǎng)的壓力穩(wěn)定時(shí)，控制器的壓力下限信號(hào)與變頻器的高速信號(hào)同時(shí)被PLC檢測(cè)到，PLC自動(dòng)將原工作在變頻狀態(tài)下的泵，投入到工頻運(yùn)行，以保持壓力的連續(xù)性，同時(shí)將一臺(tái)備用的泵用變頻器起動(dòng)后投入運(yùn)行，以加大管網(wǎng)的供水量，保證壓力穩(wěn)定。若兩臺(tái)泵運(yùn)轉(zhuǎn)仍，則依次將變頻工作狀態(tài)下的泵投入到工頻運(yùn)行，而將另一臺(tái)備用泵投入變頻運(yùn)行。當(dāng)用水量減少時(shí)，首先表現(xiàn)為變頻器已工作在最低速信號(hào)有效，這時(shí)壓力上限信號(hào)如仍出現(xiàn)，PLC首先將工頻運(yùn)行的泵停掉，以減少供水量。當(dāng)上述兩個(gè)信號(hào)仍存在時(shí)，PLC再停掉一臺(tái)工頻運(yùn)行的電機(jī)，直到最后一臺(tái)泵用主頻器恒壓供水[4]。另外，控制系統(tǒng)設(shè)兩臺(tái)泵為一組，每臺(tái)泵的電機(jī)累計(jì)運(yùn)行時(shí)間可顯示，24小時(shí)輪換一次，既保證供水系統(tǒng)有備用泵，又保證系統(tǒng)的泵有相同的運(yùn)行時(shí)間，確保了泵的可靠壽命。ALLEN BRADLEY 1746-NI4 WARNER ELECTRIC 5370-273-204 UM-50-1020
KOLLMORGEN BDS5A-106-00200/204C-2-030
MILLER AV81B2B-2.00-8.000-0063-N11-0
GENERAL ELECTRIC MDP1130000CA
ALLEN BRADLEY 1794-IRT8
ALLEN BRADLEY 1746-NI4
MAGNETROL 705-5200-110
SIEMENS 6SE7021-8EB61
MITSUBISHI FR-E520-5.5KND-04
ALLEN BRADLEY SP-142535
CLEVELAND MOTION CONTROLS MWP-12662-0
SCHMALZ SMP20NCASVD
FOXBORO 13A-MS2 3-15PSI
METTLER TOLEDO B15201300A
ALLEN BRADLEY 505-COD
DOMINO L012640
KEYENCE SR-1000
FUJI ELECTRIC CPS-420F
ALLEN BRADLEY 135254
MITSUBISHI FR-A540-5.5K-EC
GENERAL ELECTRIC DS3800NGMA1B1A
CUTLER HAMMER 1775K
RELIANCE ELECTRIC 35W344Z538G1 079163-64-EA
EATON W200MLCFCY4Y7
JSK RBS-001-A-C
KUNKLE VALVE 910BHGM03ALF
KEARNY & TRECKER 871-20652-00
YASKAWA CIMR-G5M47P5
ALLEN BRADLEY 808-M2
GE FANUC IC697PCM711W
GE FANUC IC697PCM711S
FANUC A16B-2203-0910/07A
FURNAS 18CSD92WFSS
GENERAL ELECTRIC 36D877201CAG03
FANUC IC697CMM712A
VIATRAN 2184BEGF51E
SIEMENS 6AU1230-2AA01-0AA0
ALLEN BRADLEY 22DJ9-4001
SIEMENS 6GK60900GS210BA0-ZA04
ALLEN BRADLEY 808-J2
ALLEN BRADLEY 809-A11E
BANNER ENGINEERING PPROCAM1.3S
ROSEMOUNT 3152ND3A2F0A3C3Q8 3626PSIG
DYNISCO PT422A-10M-6/18
EATON XTAE185L22TD220
PHOENIX CONTACT RAD-ISM-900-BD-BUS 2867092 5-36VAC/DC
KEYENCE LKG-3000
RELIANCE ELECTRIC 57416-N
NOTIFIER SIB-2048
SQUARE D 8810SCO4V02S
CCS LFV2-70SW2
ROMET RM3000 175PSI
FAIRCHILD TFX8001-061061
SIEMENS 7ML5033-2AA10-1A
AERO-MOTIVE 90JA
ALLEN BRADLEY 440LR4K1280YD
KUHNKE KUAX 671
ALLEN BRADLEY 808-J4
KEYENCE FD-M5AYP
BENDER IRDH575B1-435
QPL21100C2P-C
MITSUBISHI HC-SFS152
ALLEN BRADLEY 20-750-EMCCM1-F8
LENZE AC TECH M15100B
FANUC A06B-0128-B675#0008
FISHER 24B2191X012
GENERAL ELECTRIC CR305F000BAUA
ROSEMOUNT 1151DP4E23B3
BAILEY 543041FAAZ1
MARPOSS 3408010001 0ND4943
ROSEMOUNT 1151DP4E22B1DF
MSA A-ULTX-PCB-E-E-3-0-0-0
ALLEN BRADLEY 1336-B003-E0D-FA2-L3
NACHI AXTP EFD0T-EC10
AMERICAN INDUSTRIAL STS-1002-A6-FP
GENERAL ELECTRIC DS3800NEPD1E1B
GENERAL ELECTRIC DS3800NEPD1D1B
GIDDINGS&LEWIS DSA030-230-S M.1300.5142
HONEYWELL STD924-E1H-00000-1C.MB.S2-B77P
WINSMITH E24XDSD061X0RF
EUROTHERM ACMN0650-4/2-6-GW
OKUMA I006-0613-74-95
SIMCO CHARGEMASTER 5 0974707000
OMRON NE1A-SCPU01-V1
FLOWSERVE 052370-00 8CNG104
DURANT 55100-450
NABTESCO RV-120C-36.75
GE FANUC IC693ALG391
FESTO VIFB-03-B03E-FB603P-4M4J4M+HW 18980R315
INDRAMAT KDA 3.2-100-3-A00-U1
ALLEN BRADLEY 6176M-19PT
YASKAWA SGMEV-08DDKH-HY11
ENDRESS+HAUSER 50P40-ELGA5RA0BAAW
SEW-EURODRIVE MDX61B0005-5A3-4-00/DFP21B/DFP21
FISCHER DE50N340B91E
SYMBOL 3805-CM0EA6E
DANAHER B160WD
GRUNDFOS 96712417 DMI3.0-10B-PVC-P3/T/C-XG133F
ALLEN BRADLEY 2364-SPC02A
HONEYWELL YSTG140-(E1G)-00000-A1
ROSEMOUNT 8711ATA15FU1E1G2Q4Q8DTV2
YOKOGAWA AE220MN-AB1-LSA-A1DH/BR/FF1/FN1
BALDOR 601A100-1
CUTLER HAMMER 92-01263-02
ALLEN BRADLEY 2707-L8P2X
IPO TECHNOLOGIE PAC8SL
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