隨著我國(guó)城鄉(xiāng)建設(shè)的迅速發(fā)展,水、電供應(yīng)不足的矛盾越來(lái)越成為人們關(guān)注的問(wèn)題。例如,人們?nèi)粘Ｉ�活中的用水量越�?lái)越大,一天中的用水量的波動(dòng)也越來(lái)越大。以往的供水系統(tǒng)中,水泵的選取往往是按最大供水量來(lái)確定,而實(shí)際的用水量在不斷變化。高峰用水時(shí)間較短,這樣水泵在很長(zhǎng)一段時(shí)間內(nèi)有較大余量,不僅水泵效率低,供水壓力不穩(wěn),而且造成大量電力、水資源的浪費(fèi);并且以往依靠手動(dòng)操作控制泵的啟動(dòng)、停止,也已不能滿足要求。這里,介紹一種變頻控制的恒壓供水系統(tǒng),它既能解決人工操作的繁雜勞動(dòng)和精神壓力,又能節(jié)約能源[5]。 一、系統(tǒng)介紹 該控制系統(tǒng)主要裝置包括：可編程控制器（PLC）、變頻器、壓力傳感器、PID控制器以及相關(guān)軟件控制單元。該裝置形成一套完整的、全自動(dòng)的、智能的恒壓供水控制系統(tǒng)，如圖1所示。該系統(tǒng)能夠以三種方式工作，分別為全自動(dòng)、半自動(dòng)和手動(dòng)操作方式，其中后兩種是在全自動(dòng)方式出現(xiàn)故障時(shí)的彌補(bǔ)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。RX61DT80N2BMG1HF
1494V-DH666
259004AL007, 148570-1
HS GH-7
S-K220UL
AV301CB120
1756DHRI0
306-567,04
LB-20K
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Allen Bradley, 1746-NI4
Ross, 2171A8924
JKC8316G34V, 302681-V
EF8210B54
P48-14M-115-E 
Giken, GFC-S2, LWDJ011808 
480 208 879
BL-701
HW9380787-A
DSA3208CR-L
NDX3B100
QBM32150TN 
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DG5S4-046C-M-FW-B5-60 DG4V-3S-6C-M
4WEH16J63/6EW110 
VM3543T
2755-LD8S1X1 
KXSD40-ALZ
PKD01UB1 MD01R-02-0045
MRE-32SP062SBC
Yaskawa, SGDH-01AE
48ASE3M10 ESP100 
KG, ATT-350A
Allen Bradley, 700DC-F400Z24
Superior Electric, 221797-001
Yaskawa, JANCD-ABB04-E
Miller 187243 
E-C 9114 
BEAV005 0156234.03 
1305-BA03A-HA2 
218/AS-BDAP-218
Fireye EP160 
Siemens 6ES5470-8MA11 
Rexroth, VT-5004-24/R1E, R900010742
Banner, GMMSDINT-1T2
Omron, 3G3MV-AB040
Allen Bradley, 194R-NJ030P3
Siemens 3TK3540-0AC2 
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F362V
57C404C 0-57404-3A
425A/60A/480V/277V/0V10/PA/99/674/00
425A
JANCD-MIF05, DF9200840-BO
PNOZ3-24VDC-5S-10
CSF-14-100-2A-R-SPA843
110444.00, C6T17FB14B
SLC-0050
FR-40-100-2-G-SP
USAREM-01CE2OB
RO196C-F-SP
FR-A520-0.4K-NA
1398-DDM-009, 9101-1532
Ingersoll Rand 99384224 
V0.1-BR
SF108-065
87-011751-01 E, SX6-DRIVE
R88M-M40040-B
SGMAS-01ACA2B
MS4324B-2 
Q06HCPU-ATHS
DC330E-KE-200-21-000000-E0-0
16PLC120D3
CIMR-G08C 
M5404-564-422-A 
PLC Direct, D3-05B-1
Yaskawa CIMR-PCU20P7
Siemens, 3RT1046-1BB40
FR-E520-0.75K-NA
IAI RCP2-SA6-I-PM-6-100-P1-R05 
SVXF07A1-2A1B1 
Vickers, CT06C50
IFM, G15005
Allen Bradley, 140M-I8P-C50S
DC330E-E0-000-20-000000-00-0
SE23400075
Opto 22, SNAP-B3000-ENET
Siemens, 6GK1 502-3CB10
Omron, ZX-LDA11-01
Yaskawa, JANCD-YI021-E
Siemens, 6ES7210-0CA00-0XB0
6ES5450-8MD11
EE560-84400
973357.040.ANSI
FAL340151212J
OC-ADN-54-152-L-A
DG4V-3S-6C-VM-FTWL-B5-60
GKLA40J1C2-F05
MLV40-54-G-1646
70D20
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RCP2-C-SA6-A-PM-0-P
FRN002E1S-7U
ABB, EHW250WC2P-1L
Allen Bradley, 140G-G6C3-C80
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Siemens, 6SE64202UD175AA1
M1220BP 
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107-855
504Du IP55 
DG4S4LW-012N-B-60, 02-119575
HW9480596-A/HW9480146-A
Keyence, LR-TB2000C
Omron, D5VA-3F1, D5VA3F1
Siemens 3SF7844-8MD04-0SS1
K259558
Yaskawa, SGM-04U312
Graco, 189907, 
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Graco, 223561,
SM2-145
Yaskawa JZNCU-MTU04-3 
Dynatorque, 7D-42-2299, 7D-11-832
Sick, DFV60A-22PC65536
Sick, WT27L-2F430A
Graco, D07311
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DRC, 25-L010-B14-1500
Square D, FAL340151212
Hyde Park, SM556A100LE
Baldor, ID102F50-E
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Cognex CIO-1460 
Modicon 170 AAO 921 00 
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Simplex Grinnell 4120-6014 
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7150-101-004
MR-J3-40B
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BN624A546-01 
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Allen Bradley 592-C1HT 
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1772-LN1/A
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505-BOD-A2D, B0D 
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PR25M07K1SN
6GK5208-0BA10-2AA3
E6C3-AG5C, E6C3-AG5C-256
Go Switch, 73-13527-4DD
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XM10-H21-3, MGBH-013, GC320-3-V2S5
Danly, 0712-98J4, B-18489B-1
DL1200A
LS303, 817.0017, SB8G-004
MC07B0011-5A3-4-00, FSC11B
RAYSHLTCF2LS1 
Sti VS6572 
836T-T351JX121X9
FA36050 
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Keyence, IL-1000
SEC23010083
865132-MR
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Ajax Tocco 9FP57 0639 
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Ingersoll-Rand, 363-314
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12-5810-010 
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Sew Eurodrive, DFT80K4
Siemens ITE, B0S14352
CCS, LDR2-701R95
Graco, 204926
L5455Z10253
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SMC, NVBA4100-T04
Weber, 3202.30, D-25377
Procentec, 17010
4080C000000000X
505-BOD-B1E, B0D 
KP1-203
VS-20TP 
GPC-D1, AU662N1
KA361252200 
CL07E311MD, CL07E300M
30-0295 LP-25 
Balluff, BTL-5-A11-M0152-Z-SU050-S32
Banner, MSE2424
Mitsubishi, FR-E520-2.2KN
Rexroth, 0 811 405 081, 1M45-0.8A
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Graco,178888, 402-757
LCF450
UDC 3300, DC330E-K0-000-20-00000-00-0
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333DC2 
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DILM1000-XHI11-SA
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RCP2-SA6-A-PM-3-100-P1-S-BE
5,000lb Load Cell 3274-5K 5000 
ED48CZ
3C-300PC-SE1SP 
2088-G2A22A1
RH450X5B, 153331-1
MUSC-1T3-02637
42RLL-4000B
LC2D65AG7
Compumotor, 96011700231
CB-5101M, MB7391
FR-E740-0.4KNF
C-8172-1030G 
HMCP150T4C
CN76060-PV
FGOSST0100N00S
MR01-P22A
Siemens 6ES5456-4UA12 
EP-1394V-0 
30003896B 61000482 
TM98-I/A 
EHW250W-20-11, SK826481-BG, EHW250WC2P-1L
UFC-1200A, UDS9A 
060-H417-01
DV-90NE
12-10009 XLY271
No.444 AU6638N1 6590-91018 
SMC ISA11-6-01G 
LC2D65ABD
Fast Corporation CSC 901NT 
SMC ISA15-5R-01BG 
Allen Bradley, 836T-T351JX9
Banner, MSE3224, 41403
DC300L-0-000-20-BF00-0, UDC3000-VERSA-PRO
120-213C
HI-125E2
157500-0052 A105N 
6KG1123F50X4B1 
CMSS 310FG-12-02
N3659100249, K352078 
FR-E520-1.5K-NA
Dodge 132155 
PN.9987-3338-1000 
TB96-PO1A
PQ3203G
006AD MG18 CS1GW-51 YKC8V-0 9701C020
XCS-E7513
Allen Bradley 150-A05NB
Townsend Riveter 42561 
BA17DMHMTPA
A17 3408617861 
QJ71DN91
GV-H450

注：聯(lián)系我時(shí)，請(qǐng)說(shuō)是在“傲立機(jī)床網(wǎng)”上看到的，謝謝！