恒壓供水系統(tǒng) 全自動恒壓供水控制原理 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)際檢測值進(jìn)行PID運(yùn)算，并給出信號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與變頻器的高速信號同時(shí)被PLC檢測到，PLC自動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)將一臺備用的泵用變頻器起動后投入運(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有效，這時(shí)壓力上限信號如仍出現(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)信號仍存在時(shí)，PLC再停掉一臺工頻運(yùn)行的電機(jī)，直到最后一臺泵用主頻器恒壓供水[4]。另外，控制系統(tǒng)設(shè)兩臺泵為一組，每臺泵的電機(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。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
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QJ71DN91
GV-H450
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57405-D
GPC-D2
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SIG Berger Lahr, VRDM 597/50
940-A4V-AD-001
C-8335-4810-10 YN70008M8H
NRG050S1ZC1
Siemens, 6GK1502-3CB10
LCS-2TA
MSB01-15-100
YEW005010
MVH-5/3G-1/8-B-VI-X
JANCD-MEW02-1, DF9201012-C0
0064465-001
PNOZ8
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TP-5107-3
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QD62
1784-PKTXD
XVME-230, 70230-001
A20B-0008-0242, A20B-0008-0242/0204A
MCS-500-01, 7150-101-004
BES-516-B02-KHG-12-602-SP02
Cash Acme 20303-0040
PC-A984-145
700-NM200A1
PDT-S2010S00, PDT-S2010S
MG-08-0F-20
SP-120659, 1336
V5055C 1026
160-AA03NPS1
140M-H8P-C30
6KG1123F50X1B1 AF-300G11
Parker AMP, 5034-233
JAPMC-I02308
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Megger, 212359
IF5155-131
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HDU221
ATI, PV1-M, QC151M
Lion Precision, LRD 2100
LG5B65PU
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A20B-2900-0480, A20B-2900-0480/02A
253-420, VAP040-A
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Fanuc, A16B-1211-0042, A16B-1211-0042/02A
Allen Bradley 1784-PCIDS
GE Fanuc A16B-2200-045
Parker, L6553910249
Graco, 208997
Flex Link, XTPD D35
A20B-2902-0372
FCS-N1/2AP-ARX-B1151/D031
XC1 AC117 AC117H2
Q61P-A2
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M001
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Dwyer W.E. Anderson, SF11
AN2P35012
SG926-LN5403.5
MR-E-40AG-QW003
MP-2500-00-000
KBLD180-C
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MG10-P1
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TA 2-81240
LK7023
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16732 RM831000
RA15A18004
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Fanuc A16B-2202-0401
Allen Bradley 700-RTC31S300U1
Riken Keiki GP-621D
Omron, E5AX-LAF-X
Parker, P5G-AP6BCNRAS-A
Unipulse, F362V
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AS-B827-032
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TZ1RE024BHA-C1903
Thomson Industries, 7828132
NTAI06
AL230A-7A2
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MML400-E25535, 4B3NA2A-1436
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RB18025UUCC0-G1G
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C11500
836T-T352JX6
SR33-017AM
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ENF602-3PB611
SPG1 209039 FJ 60a
DC300K-A-2A3-21-0000-0
FC-D980C
Allen Bradley, 154-A11NB
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MXQ16L-50C-M9BL
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81-MT
1746-NI4
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W200MLCFC, 1A96682E01
Rosemount, 580D-10
1179B00713CR14V
9363-B10-1K-20P1
Dura, HS H7 B, 3-12
Jamesbury VPVL200-SR6-B-C
Burkert, W33ML, 00002428
2213 67.55/1 50-5000803
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Mitsubishi, FR-A220E-0.75K-UL
Lab Master DMA 811962
Allen Bradley, 194R-NU100-1753
Valtorc, TJ26396
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SFR-13 FR-20-50-2
0-51831-6
Square D, 8502 PG3 11V02
AJ35TB1-16DT
Opto 22, G4RAX
DC300E-0-000-20-0000-0
Paragon 500-132-00
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