隨著我國城鄉建設的迅速發展,水、電供應不足的矛盾越來越成為人們關注的問題。例如,人們日常生活中的用水量越來越大,一天中的用水量的波動也越來越大。以往的供水系統中,水泵的選取往往是按最大供水量來確定,而實際的用水量在不斷變化。高峰用水時間較短,這樣水泵在很長一段時間內有較大余量,不僅水泵效率低,供水壓力不穩,而且造成大量電力、水資源的浪費;并且以往依靠手動操作控制泵的啟動、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,它既能解決人工操作的繁雜勞動和精神壓力,又能節約能源[5]。 一、系統介紹 該控制系統主要裝置包括：可編程控制器（PLC）、變頻器、壓力傳感器、PID控制器以及相關軟件控制單元。該裝置形成一套完整的、全自動的、智能的恒壓供水控制系統，如圖1所示。該系統能夠以三種方式工作，分別為全自動、半自動和手動操作方式，其中后兩種是在全自動方式出現故障時的彌補恒壓供水系統 全自動恒壓供水控制原理 當主水管網壓力傳感器的壓力信號4~20mA送給數字PID控制器，控制器根據壓力設定值與實際檢測值進行PID運算，并給出信號直接控制變頻器的轉速以使管網的壓力穩定。當用水量不是很大時，一臺泵在變頻器的控制下穩定運行；當用水量大到變頻器全速運行也不能保證管網的壓力穩定時，控制器的壓力下限信號與變頻器的高速信號同時被PLC檢測到，PLC自動將原工作在變頻狀態下的泵，投入到工頻運行，以保持壓力的連續性，同時將一臺備用的泵用變頻器起動后投入運行，以加大管網的供水量，保證壓力穩定。若兩臺泵運轉仍，則依次將變頻工作狀態下的泵投入到工頻運行，而將另一臺備用泵投入變頻運行。當用水量減少時，首先表現為變頻器已工作在最低速信號有效，這時壓力上限信號如仍出現，PLC首先將工頻運行的泵停掉，以減少供水量。當上述兩個信號仍存在時，PLC再停掉一臺工頻運行的電機，直到最后一臺泵用主頻器恒壓供水[4]。另外，控制系統設兩臺泵為一組，每臺泵的電機累計運行時間可顯示，24小時輪換一次，既保證供水系統有備用泵，又保證系統的泵有相同的運行時間，確保了泵的可靠壽命。928500, MBU-625
JANCD-Y1021-E, Q15348-913-4
07115, BP200
SGDR-SDA140A01BY33
40HP32AA 
EE230-10420
E25BB-4H-SB-10-A-7406R-LED-EM16
IPESW11
700-RTC30Y100U1
S262SG02N3KK4 
200355-00-02-00
75-C953-04
PMG-223
501-04537-01
501-04561-00
A16B-1212-0540 
C1081740 C1081776 
F362 
VT5008-S16-R5, VT-5008, 11110092
A68ADC, 13KS20 
160-BA03RPS1
FR-A044-0.75K-UL 
C20E-030302A11, C20S-030102A11
VB-003SE-U
LR-TB2000C
AJ65BT-64RD3
XC-CPU201-EC256K-8DI-6DO
Sick, DT20-P244B, 1040406
SLSE30-900Q8, 117298
573-26406-00, M-1017-6277
CE0750E2ACE
FR-E520-0.75KN-TB 
HW8380798-A, 479052-1, CS-20-80-2A-GR-SP
ATV21HU22N4
34HLS4410
AK-BX850
02D224, O2DIRPKG/K
QJ71E71-100
PX02S1-30KG5T
DC300E-E-000-21-0000-0
Heidenhain, 336 976-32
6428PO
FXD63B150L
A16B-2200-0853/05B
KS-10PT
JARCR-XOI01B
A16B-3200-0220 
JUSP-WS08AB 
836T-D453JX81X15
WPPC0077
160-BA02NPS1P1
MR-J2-10A
FR-A024-2.2K-CD
Allen Bradley 1334-50387
AJ65BT-64DAV
Allen Bradley, 100-B110NZ243
R88M-U10030HA-S1
FHL3601513M8041
GE, CR115E422112
Siemens 6SE6-420-2UD21-1AA1 
505-TOS
DC330B-EE-003-20-000000-E0-0
MGR2416A
ISA11-6R-01G
700-912
AM-C916-100 
20AB2P2A3AYNNNC0 
RL-UV3/32/92 22-26VDC
Asco 8290A067 
8000-SA10 
MR-2000-09 
WH652-D-TS-22-50E9
UNR-L50
870B13PCB4GF4
NA2-N28
Bi15U-CK40-ADZ30X2-B1131 
IEE, 03901-A3-A01-07
GFC-P2
HS9170722-A
2706-E23J32X1 
Primeline 6723 
HM2P400X5WS10
F721-25-B5-J 
RX61DT80N2BMG1HF
1494V-DH666
259004AL007, 148570-1
HS GH-7
S-K220UL
AV301CB120
1756DHRI0
306-567,04
LB-20K
RR-28M-180
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 
4WE6J62/EW110N9DK25L R900461621 4WEH10E44/6EW110N9ETS2DK25L
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 
RTT20-T1LAQFA-D2L3, RTT20-T
DW-AS-713-M30-618
6FX1122-3CA01 
6FX1122-1AC02 
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
TA8110N7441E848
C7-03VFT
RCP2-C-SA6-A-PM-0-P
FRN002E1S-7U
ABB, EHW250WC2P-1L
Allen Bradley, 140G-G6C3-C80
D2773A7980
RS20-0400M2T1SDAP
Siemens, 6SE64202UD175AA1
M1220BP 
Siemens 6SE3290-0CC87-2RA0 
A14B-0076-B324
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, 
DF8203830-C0, RPN701-4Z4A-16-7
Graco, 223561,
SM2-145
Yaskawa JZNCU-MTU04-3 
Dynatorque, 7D-42-2299, 7D-11-832
Sick, DFV60A-22PC65536
Sick, WT27L-2F430A
Graco, D07311
CJ1W-ETN21
QJ71DN91
FP-AI-112, 191020A-01
C30EG2 
AU3504N22E5
ATV58HU09M2ZU
Yaskawa Motoman, JANCD-MRY01B-3
DRC, 25-L010-B14-1500
Square D, FAL340151212
Hyde Park, SM556A100LE
Baldor, ID102F50-E
MCR-20A-270
Cognex CIO-1460 
Modicon 170 AAO 921 00 
KRP-C-1500SP
Simplex Grinnell 4120-6014 
JANCD-XIO02
7150-101-004
MR-J3-40B
AM201DN
6ES7332-5HD01-0AB0
BN624A546-01 
KID10B 
CL10E311MN 
P50B05010DXS79, USAREM-01CE20B
Allen Bradley 592-C1HT 
Heidenhain, 334 749 13, LS 323
PB351-0341
S-02W-C
1772-LN1/A
SA55-084E2C3 
5120-P1B
SGMP-02BW12C 
H368A-201
505-BOD-A2D, B0D 
RPS0260UD511C202411
PR25M07K1SN
6GK5208-0BA10-2AA3
E6C3-AG5C, E6C3-AG5C-256
Go Switch, 73-13527-4DD
CRBC-11020UUE07 
Asco, SB11D
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 
FR-A720-00030-NA
Keyence, IL-1000
SEC23010083
865132-MR
HW0472080-5.5, 154756-3
Ajax Tocco 9FP57 0639 
Westcode 9FP57 
Ingersoll-Rand, 363-314
DVT, 530MR
DK812VR5
149610, DV11H
12-5810-010 
HW9270543-B, 134465-1
Sew Eurodrive, DFT80K4
Siemens ITE, B0S14352
CCS, LDR2-701R95
Graco, 204926
L5455Z10253
41/0571-06
500F-DOD930
DD116456 60/891.014.OS 
SG676-5410
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
A16B-2201-0811/04B
ERC-RA64-I-PM-4-100-M-EP-FT
DC300T-0-0A0-20-0000-0
HPG-20A-21-F0JBKA, NX-1575176-006
Graco,178888, 402-757
LCF450
UDC 3300, DC330E-K0-000-20-00000-00-0
Yaskawa, JANCD-MSV01B
333DC2 
AJ71UC24
DILM1000-XHI11-SA
A20B-8001-0620
ET311-22151
774-0192-1
EE230-12320
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

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