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PLC系統(tǒng)的正常供電電源均由電網(wǎng)供電。由于電網(wǎng)覆蓋范圍廣，將受到所有空間電磁干擾而在線路上感應電壓和電路。尤其是電網(wǎng)內部的變化，入開關操作浪涌、大型電力設備起停、交直流轉動裝置引起的諧波、電網(wǎng)短路暫態(tài)沖擊等，都通過輸電線路到電源邊。PLC電源通常采用隔離電源，但其機構及制造工藝因素使其隔離性并不理想。實際上，由于分布參數(shù)特別是分布電容的存在，隔離是不可能的。
(4)來自信號線引入的干擾
與PLC控制系統(tǒng)連接的各類信號傳輸線，除了傳輸有效的各類信號之外，總會有外部干擾信號侵入。此干擾主要有兩種途徑：一是通過變送器或共用信號儀表的供電電源串入的電網(wǎng)干擾，這往往被忽略；二是信號線受空間電磁輻射感應的干擾，即信號線上的外部感應干擾，這是很嚴重的。由信號引入干擾會引起I/O信號工作異常和測量精度大大降低，嚴重時將引起元器件損傷。對于隔離性能差的系統(tǒng)，還將導致信號間互相干擾，引起共地系統(tǒng)總線回流，造成邏輯數(shù)據(jù)變化、誤動和死機。PLC控制系統(tǒng)因信號引入干擾造成I/O模件損壞數(shù)相當嚴重，由此引起系統(tǒng)故障的情況也很多。
PARKER 1000PSI MAX HYDRAULIC PUMP PVP16104R2M12 *NEW*
PARKER 1/4" M X 1/2" F INCREASE AND EXTENSION CONNECTOR, LOT OF 6
BANJO 2-1/8" POLYPROPYLENE CAMLOCK 200A
VICKERS TOKIMEC HYDRAULIC PISTON PUMP PVQ16-A2L-SE1S-?11-C21-11
LIQUIFLO 3/4" GEAR PUMP
EATON HYDRAULICS V10 1S2S 11C20, NNB
GUSHER 3HP COOLANT PUMP MSC4-5-300FJ
BELL & GOSSETT 3" X 4" CENTRIFUGAL PUMP, NO LABEL
GOULD PUMPS WATER PUMP 2MS1G5C0 1 1/4 X 1 1/2-6
PARKER 3/4" M X 1" M W/ P16 FERRULE TUBE ADAPTER
SPIRAX SARCO 66105 COVER GASKET FOR PPF/PPC, NEW
DIAMOND POWER DIAPHRAGM FOR PUMP 53A015350T *NEW*
FILTRATION SYSTEMS SUCTION PUMP FILTER OF3-12-10
ROTO-JET SIZE S-375 PUMP ROHA 3X2 DI / 1.7805 GEAR REDUCER W/ 250HP MOTOR, A
PARKER 90 DEGREE STREET ELBOW PIPE FITTING THREAD ADAPTER 3/4 CD-S
YAMADA CORPORATION 1/4" NPT AIR POWERED PUMP, 851783 *NEW*
PARKER 3/4" & 3/8" GEAR PUMP H25AA1A/656876
STEEL HEX HEAD BUSHING 3/8" FEMALE X 1 1/4" MALE NPT, LOT OF 9
PARKER H-PAK FIXED DISPLACEMENT POWER UNIT H1X9631/10
BORG WARNER 1/2"NPT PRESSURE LOADED PUMP S1221AK25R
GRACO CONNECTING ROD FOR MODEL 222-248 KING PUMP 168-253 *NEW*
3/8" FLARELESS NUT EO 10-S , LOT OF 35
GOULDS STAINLESS MULTI STAGE PUMP W/ BALDOR RELIANCE MOTOR 1SVB1H5J6 / VM3556
SMART TURNER LTD 1750RPM END-SUCTION CENTRIFUGAL PUMP MODEL M, 4 X 3 X 10
PENBERTHY 1-1/2" NPT JET PUMP IRON MODEL LL 1 1/2 *NEW*
BANJO 2-1/8" POLYPROPYLENE CAM LEVER COUPLINGS 200D
YONG CHIUANN * 1/2 HP/230/460V/3P COOLANT PUMP * TYPE YC
VICKERS HYDRAULIC PUMP PVQ32-B2L-SE1S-?10-CM7-11 W/ UNIMOUNT 125 3HP MOTOR A954A
STERLING PEERLESS PUMP HYDROCONSTANT VARIABLE SPEED DRIVE MODEL M8C-1807-250
GEBR STEIMEL SF4-63 GD GEAR FEED PUMP W/ 3-PHASE MOTOR 5AP100L-4s (7AA) *NEW*
PARKER P4 BL 1/4" NUT , LOT OF 39
SMITH & LOVELESS 10HP MOTOR W/ 200GPM @ 75PSI PUMP 4B2A 101839
GRISWOLD PUMP CO. TYPE DI 3X1.5 SIZE 4.750 DIAMETER CENTRIFUGAL PUMP 811S
METAL BELLOWS CORP. 1/2HP COMPRESSOR/VACU?UM PUMP MB-602 103715
TEEL * PUMP * 1P777
INGERSOLL-DRESS?ER 3112 STAINLESS STEEL PUMP 2.5X2.5X4 D824 W/ 3HP AC MOTOR
VICKERS YOKE PINTLE FOR PISTON PUMP, 388745 *NEW*
PIAB 0.4-0.6MPA CLASSIC VACUUM PUMP M25B6-EN *GAUGE*
GOULDS PUMPS 180-200GPM SS316 VERTICAL BOOSTER PUMP 6SVDK8 *NEW*
GUSHER 5HP COOLANT PUMP MSC4-8-500FJ
AHLSTROM 36FT 1464GPM 1170RPM 6" X 10" CENTRIFUGAL PUMP TLN-15
WILDEN 1 1/4" INLET 3/4" OUTLET DIAPHRAGM PUMP 04-5020-01
HANNING ELEKTRO-WERKE 220-240V 450-540W 2,4-2,5A VACUUM PUMP E 8 C D 4 B 1 - 162
CHICAGO 29 7/8 " EYE BOLT
VERSA-MATIC 100 PSI -7 BAR PUMP E1AA5T559A NIB
GATES HYDRAULIC CRIMPER PUMP S20003T 3330 W/ 1HP BALDOR MOTOR
AHLSTROM 304FT 1000GPM 1780RPM 4" X 6" CENTRIFUGAL PUMP TLS-10
PFEIFFER 210L/S VACUUM PUMP TMH 260 SG / PM P02 130-A / D-35614
PARKER HYDRADYNE 2GPM, 5HP, 3000PSI HYDRAULIC POWER SYSTEM JO828A, LISTING #2
AHLSTROM 1085FT 245GPM 3580RPM 3" X 4" PUMP TYPE 6FLG8
S.J. ELECTRO SYSTEMS INC 120VAC 50/60HZ SUPER SINGLE PUMP SWITCH, 10SSD1WP *NEW*
SIEMENS 77GPH ENCORE 700 DIAPHRAGM METERING PUMP E7D3DAXSDA1
St.1/4" X 1/8" STRAIGHT COMPRESSION TUBE FITTING EO 6-S, LOT OF 4
G&I GOULD PUMP CO. SIZE 1X2-8 STAINLESS STEEL 2HP CENTRIFUGAL PUMP 10ST52035V
PARKER 5/16" ASSORTED COMPRESSION FITTINGS, LOT OF 4
WORTHINGTON ROTARY PUMP SYMBOL 3GR
LIQUIFLO GEAR PUMP 33FS1133S00000 NIB
IDP 4" X 6" STAINLESS STEEL CF8M A744 CENTRIFUGAL PUMP HOUSING UH1889
CARVER PUMP CO. 10-1/16 DIA. 600GPM 1750RPM 20HP IMPELLER 5X4X11 HAV-27 100472
GUSHER PUMPS CENTRIFUGAL PUMP PCL3X4-10SEH-C-?A
Newly listedBLACK CLAWSON UV 600 POWER END
GAST ROTARY VANE PUMP 1065-V3 W/ DAYTON 1/2HP CAPACITOR AC MOTOR 4K937-L
AURORA 1750RPM CENTRIFUGAL PUMP 1.5 X 3 X 6 C T921 153 14
GUSHER 1&1/2" LONG COOLANT PUMP YL-LONG-CDM-A
MAC 3.0 / 1.4A 115/230V TYPE 2C2-42316 PUMP B7449-3
SCHERZINGER PUMPENFABRIK GEAR PUMP WITHOUT MOTOR 7300B/EX/2A5
SULZER AHLSTROM 125FT 1660GPM 1780RPM 6" X 8" CENTRIFUGAL PUMP APT42-6
NORDSON PUMP 306566A *NEW*
GORMAN-RUPP 3/8IN THREAD 316 SS PROPELLER CF8M / 56208 102000
BSF STAINLESS STEEL C-FACE ADAPTOR VQPE-A0028, NEW
NASH VACUUM PUMP SIZE CL 2005
VICKERS EATON VARIABLE DISPLACEMENT PISTON PUMP PVH57 C RF 1S 10 C25V 31
BSM PUMP CO 1-1/2" HYDRAULIC PUMP BS 55 KE 31
ITT 3 X 6
HUBBELL KELLEMS WIRING DEVICE F4 074-01-1042 LOT OF 3
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