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。REL-BLT1 540S39
UDK5114NA
MXW12-125B
2000-808
61C542
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1S8F
928500, MBU-625
JANCD-Y1021-E, Q15348-913-4
07115, BP200
SGDR-SDA140A01BY33
40HP32AA
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Sick, DT20-P244B, 1040406
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CE0750E2ACE
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HW8380798-A, 479052-1, CS-20-80-2A-GR-SP
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Allen Bradley 1334-50387
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Allen Bradley, 100-B110NZ243
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GE, CR115E422112
Siemens 6SE6-420-2UD21-1AA1
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Ross, 2171A8924
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P48-14M-115-E
Giken, GFC-S2, LWDJ011808
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NDX3B100
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4WEH16J63/6EW110
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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
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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
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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
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