恒壓供水系統(tǒng) 全自動恒壓供水控制原理 當主水管網(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)定值與實際檢測值進行PID運算，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。當用水量不是很大時，一臺泵在變頻器的控制下穩(wěn)定運行；當用水量大到變頻器全速運行也不能保證管網(wǎng)的壓力穩(wěn)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(tài)下的泵，投入到工頻運行，以保持壓力的連續(xù)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(wǎng)的供水量，保證壓力穩(wěn)定。若兩臺泵運轉(zhuǎn)仍，則依次將變頻工作狀態(tài)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(xiàn)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(xiàn)，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(tǒng)設(shè)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(tǒng)有備用泵，又保證系統(tǒng)的泵有相同的運行時間，確保了泵的可靠壽命mm8800/xx A20B-2100-0120/02A
Type # T-1
pk564bn-tg7.2a3
PRM3 PP07K
2755-DS4A
LX2-01R & LX2-01T
A860-0304-T011
a06b-6047-h001
se-176
General Electric 44A294529-G01 Board, APA1, 44B295308-001
99340465, 99340473, s/w 89994R02
Northman Druckschalter, ps-35
125, 105-212
1000-nx103
A20B-2900-0482/01A
44A719314-G01 002/3, 44A719201-001
kso-g02-2ba-20/ks-g02-2ba-20
60gj03, 600vac
KRF2-1000
CDA2F40-50 - F 5 2-SMC D-F5BA
CRA1BW50-190C
SMD6 30F30
3rk1300-1hs01-0aa0
IBM 1-03/00, SLM 2-02/01
ds121, 626b100g04
152/010-500-180sz825
nf-s-413075/11-80
e3900-596-007
3rk1300-0ks01-0aa0
pe-1002-05
cvx-0260b-n
C-8335-1110D
HD51C B/HD-51CB
075TG4P-GR4, TOP-1ME75-2-10MA
2e-24p
GT-20601
GE Trafo, 9T58B3357
a16b-1810-0010/02a
HD3-42SG-KcP-03B-DC-L
dfm-32-100pa-gf
modicon 3 position servo boden, 110-131
a20b-2902-0290/16c
6dp2-50/210ym
mgse 75-12a
p4130b-2
M52
HURCO BMC 4020HT
Typ # 6.0
TM12, D-73461
A16B-0160-0543/30G
03.25 SB2AUS19C
1208 1210 1212
b-63005en/01
BFCI-z3
8121190
vt130g204035, vt3b-0101b
18d-1-30
1ZK71B2
SJ 555106-1
987-7-36
A16B-2200-0853/05B
he-d-mini/lfr-d-7-5m - midi-a-sa/lf-1/8-meh-hgl-sa
XCG-03-F-10
AS-H827-107
JEC-204, Typ HT-30C
m325my-v, mc021c, bn624e859g52
30222, PSC-3
IFM efector pn7003 Drucksensor 0-363
Monarch Board, 50303
6728-042.244639
6-07-004-010
PCB 11d704
f-66wn2
233900, pse4-sc-01
7610015
AA1124
958287-01
rmg12.2-nn
25TP305
LZ60-C
DS2100-1010
2212 ETN9/C3
ETK000720
836T-T351JX28
a860-0300-t002 2500
rb525-278
bn624e525h01
FX702B, BN624E525H01
a300w-20
8520-Riom 1, Art.-Nr. 160620, REV 01
a05b-2310-c010
OPT3, A-79131-2
SE-154X/SE154X
fin1200010v
prm2pp07k31 x4387
FL7M-10J6DT
typ # sma-6
CRQ2BW40-180C
u60-t95a
A02B-0236-C150/B N860-3118-T001/07A
8536-sbto/8536-SBT0
Okuma/TDK MRM 043C/MRM043C
700-PR2710A1
a16b-2200-0917/05b
415-0177-019
419-0-0444-01
06 & usfr - 08
Autocon 4204347 C 181 t4204019
SM10
AS-884A-211
Okuma LT25
Type # T-3
a-5259-0026
hd3-2wd-bca-03a-lya1
SAMSOMATIC 2614-00
100s-c43zj14c
FS5106-16-07
eq5100-dep-1
8997 EQ5100-DEP
Mod # bt-10917
Lapp Textima Transformer, ein 130542,
MLA-03W
6fx1126-4aa00, 548 264 9001
509-T0D-A2E
CCP2AU14AC
Typ # rf2080
Daykin Transformator, TA500
b-al-30k
B592
JPAC-c346
Mitsubishi CNC IPA-56A
tdc-1a, qa-624
avca - 02-dwc, by171a444g51
140-0350-000F
osm-01-2gaz9-n13
Shibaura Platine H07287601
8pp-37130-03/8pp-36776-00/8pp3677600
15-242-51, 1524251, 15-000242-0051
BTA-A11-0230-E, btaa 110230E
bta-a11-0225-e
S20-D1
sxe9573a800028na
FANUC PC BOARD, a16b-2202-0850/02a
DF Steuerung Platine 6403 04 000 152 00
GE 44a399748-g01 PC Board snrd 2a, 44b399269-001
Kuhnke i1540/i1540.2
AP-11
Art.-Nr. 088946
rc22a, bn624a949h01
R98790
Ossa - 04-g, by171a396g51
DMPA - 02-g, by171a398g51
swinc - 3-g2
55325-78/55325-78a
ra16an/ra-16n, 13-55599012, mit 16-Idec r15-0a23z
IC600CB504A
fw53c, bn634e040g53
Nemic LAMBDA DC Netzteil, ec-9-5v
0039/sdcs - 07
FANUC PC BOARD, A16B-2200-015
WERA EMG Recotec 2-Axis
18-13-11-00/03, 18-13-11-ls
nnb0798, nn-16sii/t/tc
415-018-002
mbv2-p di16, Art # 55483
PCBA 81-0039
ino-12 10-08-04
ldv-5412dt
eu10023, eue-7-100230100
1937794
se-136-1
3s011005
Schneider 25a Ground Fault Protector, 60989
021-5238 000 E, 140-5421-000B
VME Ji 17 Slot, 23000-047
nn-13sii
FPA067T-1, KS-CM7B, NM5A-1
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