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P/N 286175Y P/N 9101-1135
P/N 9101-1136
H-200BA2F-G
CD-001-2 # TM-4SE
C0750E2AFB
tr-9dd1b
bu-kda3250, 250a
9070 SK5271T
01.7/1/op 02
HV2 163-238120, 163-265206
BW013-A0 B00 seqio, 68E2.117634
PC2J-CPU/THC-2764
141-1bf10-0xb0
Sencon, Inc. R800-A
M.1018.1239
140-0110-000H
bn624a241h01, fx63/fx63a
42DRC-5400
OSAI/Allen Bradley OS 5395 PC Board, 9327796M
Yaskawa jancv-MCP02B-1/jancu-MCP02B-1 & JANCD-MMM04
30250, PSC-3
A138021
100-0369
e4809-032-473-a
214069001/214 069 00i
Eli Platine 1936190
4243648, 3-3/8
e4809-045-038-c
Siemens Platine 634901-b1020
DSP-875, # 344-66675A, ASSY 344-66715
DSP-886, # 344-66686A, ASSY 344-66726A
DSP-874, # 344-66674B, ASSY 344-66714
214069 00f
Q-0510, 650 Q-0509-02
852 5770C
SI 681, 40225a
JUSP-WSCB 02aa, df9302710-do
Toyoda PC Board, TP-2240-3
109-0468-3806-01
CT20.C/CT20C/60.6.14
CT50.A/CT50.B/84.12.17
CT30.B/CT30B/85/4/5
51981/zuep
LGF-040-100
803' 01-00/803.0100doe
415-0181-002
OPP-01
PWA 27-1037
608051-9405
bn634e183g52, fx84b/fx84-5
14L AR008-11
a20b-8002-0050/01a ic660elb912j
a16b-2300-0011/03a
608481-9320
Siemens 4av3202-2ab
UF01A, FX30A, BN624A235H01
PC-0085-005
by171a443g51
31-009 R3
4ap2195-7da00-8b
20-S-74W-M-3 - yeyd - 1-44
B-AL-37k
dg4v-3s-2n-m-u-h5-60
JPAC-D003.1, ETK000830, ypct - 11056-1
3M-921813B, YM9094304 B
as-506p-008, Rev. C, m506-000
D1SBD2 851228 8513 61
KS-YZ 201a-2, BN 330 B 248 *, ks-yz402a-0, KS-YZ 201a
a20b-2000-0650/01a
Leeds & Northrup , 074417
415-0601-002t
a16b-2202-0918/05b
fhl361001021
A06B-6083-H245
pg1-480-3
C70051/C
HJ 060, hja260151
f480p1000
ngdx 2425-890809t6,
e8204b39, bu-1201d, sa5-005495
V209AM020
fx709b/bn624a527g52
ORB-H-170-2PM
6140-42-21-7x5
WB116A, KS-WXH0-1, KS-WXH0-11/FP5-MD45
4d41-s1593
kal362251212
4D61-S1593
ACNL-X2-40X350
KGG 75-12
BN624E860G53, MC031C
AIA-23
Motor H-100CC4-G
a06b-6047-h002, a20b-0009-0320/10d
509-DOA
OEMC - 8MB
HURCO 415-0193-003A 414-0193-002A
HURCO 415-0193-003b
bn634a218g52, mc611/mc611e
1024 02s12-03
503-E04-262M
TL-C-2
30011, PSC-3
Shibaura 8D02 PC Board H034264
Shibaura 8SCU PC Board H072876
DSP-873, 344-66673C, ASSY 344-66713
Cincinnati PC Platine 3 542 1135a
68E3121873
Pilz PNOZ xv2.1p
Typ # ADV 9424
20-MU PC Board, Mod # 4202879
2212B-A018ABD-1-7EB42-24J-37-98-850GMD
44A294506-G01 , 44A296356-001
HC1-XD-50X200-FA
7007CGD2/GNP4
c41e-0701ag300
852475 apm4, 5a, 811080 E
3-E98380A
Omron CJ1W-V600C12 CJ1WV600C12
462018.1916.01, 462018.7600.51
140DAO84000
109-0852-3a09-08, 109-0852-3b09-08
FEC-FC30-CHI, PM974201-200143 H00-S1.03
Wei?e Sundstrand 128 in-G Modul PC Board, 65000778
44A294501-G0, SUP3, 44B294156-003
fr05cm52ac
RP236B, MEC-37AV-0
E61160
6315327002, 6840040185/b
CRA1FSH50-100
BN634B017G51, MC251/MC251B
Typ # 4-t0113
MA02/1-0059
cz-v21
t750l
mc151a, # bn634a336g52
5012611 B m8028
UF01A, FX10A, BN 624 E 288
TOP-1ME75-2-10MA
UF01A, FX30A
HFC-D-303, 1800
B521078-2
AS-884A-301
LCM-140, 70160-1011
a20b-8002-0130/02a
h23102410123796
A20B-3300-0254/01A
TT-700
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