80R18984

PID控制与模糊控制是从自动控制的角度来设定的，PID控制是工业生产中的常规控制方式，技术成熟，用于本系统时因炉温是一个大惯性的对象，对快速性要求不高，但为减少对电网及用电设备的损害要尽量减少超调，因此在构造PID控制器时采用了积分分离的形式，即在大偏差时用P调节器，小偏差时用PI调节器，从而既减少了超调，又保证了稳态有较高的精度。

　　模糊控制采用的模糊决策表，该表存放于S7的某个变量存贮区中，由查表程序获得控制量，即对应的调节时间。为避免被控量在期望值附近振荡，对模糊决策表进行了适当调节，设立了一个调节死区，从而减小了稳态时电极的调节次数。实际生产情况表明，只要系数调节得当，模糊控制和PID控制都能获得较好的调节特性。

　　变周期控制对计算机控制系统而言，合理的控制周期至关重要，电石炉控制系统也有这个问题，若控制周期短，则响应快，但调节频繁，反之亦然，为保证响应的快速性，又去掉冶炼过程中功率晃动对所采入模拟量的影响，除对模拟量进行平滑滤波处理外，还对系统的控制周期作了调整，使其在电流（功率）变化初期控制周期较短，保证响应的快速性，而在稳定工作段控制周期较长，利于滤掉功率晃动引起的频繁调节。
丙烯腈车间循环水冷却塔，由风机对循环水进行冷却。为确保循环水冷却效果，并从经济性、安全可靠性及技术先进性几个方面考虑，由一台风机采用变频控制，两台风机采用软启动器。在确保冷却效果的前提下，充分发挥变频调速的作用。

　　在风量要求较低时，采用变频方式降低电机转速，使电机能耗大大下降，取得显著的节能效果。

　　将变频风机设为两种启动方式，即变频启动方式和直接启动方式，可以实现风机在不实行变频启动的情况下也可紧急进行直接工频启动，确保在任何情况下风机均能安全可靠工作，保证冷却塔的冷却效果。

　　每台锅炉由两台风机送风，采用变频控制方案，由变频风机进行风量调节，实现节能，提高风质量，保证锅炉燃烧效果。两台锅炉分别由二台变频器和二台软启动器构成风机控制系统。变频启动风机控制也同样可以实现直接启动功能，在不执行变频启动的情况下，将转换开关放在直接启动功能，实现直接启动控制。
现在的变频装置是在逆变器的基础上发展起来的，过去的逆变器，由于受半导体发展的影响和微电子技术发展的影响，体积做得很大，并且容量小，各种性能不太理想，因此也就阻碍着它的推广应用。交流变频调速装置在改善工艺条件和节能降耗上的优异特性，使得人类用电更为合理有效，它的推广应用还能使企业的装备向现代化方面发展，提高企业的装备素质。

　　近年来，在所有发达国家中各类产品的调速系统都采用了这一装置，由于交流变频调速装置在改善工艺条件和节能上的优异特性，对泵、风机等用电设备，需要调节流量时，应采用电机调速代替阀门控制。交流调速驱动是我国近年来发展较快的节电技术，这门技术用于变负荷的风机、水泵等设备，可比阀门、档板等节流方法节约更多电力。

　　所谓变频器，它的简称代号为VVVF即为变压变频，一般的称呼就为变频器，它的工作原理是基于变压变频之上，变化频率和变化电压相一致，即V/f=常数，为变频器的压频特性。由三相电源经三相桥式整流为脉动的电源到三相逆变电路，经三相逆变电路变化成不同频率和不同电压的电源输出，三相桥式整流电路为大功率硅二极管组成，三相逆变电路由电力晶体管组成，基极接控制电路的控制信号，由不同大小的控制信号完成晶体管的导通情况，以达到变化逆变器的输出，输出电源波形近似为正弦波形。此调制也最适用于交―直―交变频器中，也就是说在中小容量变频器中得到广泛应用，如果在大容量，高压中应用，就须采用交―交变频器。

　　变频器调速应用到风机、泵类上有如下优势。

　　（1）因为转速都与流量、压力、轴功率有比例关系、平方关系、三次方关系、调节了变频器，那么转速也变化，转速变化，那么流量、压力、轴功率也就跟着变化。

　　（2）由转速的变化调节流量、压力代替阀门的节流方法，可以节约大量的电能。　

　　（3）风机和泵类采用了变频器后在低速下运行还可以降低噪音。

　　为何风机和泵类适应变频器调速，以最佳的运行状态满足生产工艺的要求这是因为在设计风机和泵类时，要将其留有一定余量，是为了在较大负荷时，能满足生产工艺的要求，但是生产工艺是变化的，生产工艺要随着实际情况而变化，一会大，一会小，在此种情况下，采用调速控制其流量的输出，从多方面实际经验得出以上的结论。

　　总而言之，变频技术的成熟，以及变频装置的推广应用，使企业的装备上档次，上水平。让企业用电更合理化，为企业降耗增效提供可靠的条件和措施，早应用早收效。
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Dedietrich Temperature sensors beavertail 37" platinum coated

DEFECTIVE FOR PARTS ONLY ERROR SOLD AS IS

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Delta AC Motor Drive Inverter VFD1100C43A VFD-C2000 Series 150HP 3 phase 380V

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Delta AC Motor Drive Inverter VFD1850C43A VFD-C2000 Series 250hp 3 phase 380V

Delta AC Motor Drive Inverter VFD185V23A-2 VFD-VE Series 25HP 3 phase 220V 18.5K

Delta AC Motor Drive Inverter VFD185VL43A VFD-VL series for Elevator 25HP 3

Delta AC Motor Drive Inverter VFD185VL43A-J for Elevator 25HP 3 phase 380V 18.5K

Delta AC Motor Drive Inverter VFD2200C43A VFD-C2000 300HP Series 3 phase 380V

Delta AC Motor Drive Inverter VFD2200F43A VFD-F Series 300HP 3 phase 380V 220KW

Delta AC Motor Drive Inverter VFD220B23A VFD-B 30HP 3 phase VARIABLE FREQUENCY

Delta AC Motor Drive Inverter VFD220V43A-2 VFD-VE Series 30HP 3 phase 380V 22KW

Delta AC Motor Drive Inverter VFD2800C43A VFD-C2000 Series 3 phase 380V 280KW

Delta AC Motor Drive Inverter VFD300B23A VFD-B 40HP 3 phase VARIABLE FREQUENCY

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Delta AC Motor Drive Inverter VFD300C43A VFD-C2000 40HP 3 phase 380V 30KW

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Delta AC Motor Drive Inverter VFD3150C43A VFD-C2000 Series 3 phase 380V 315KW

Delta AC Motor Drive Inverter VFD3550C43A VFD-C2000 Series 3 phase 380V 355KW

Delta AC Motor Drive Inverter VFD370C43A VFD-C2000 50HP 3 phase 380V 37KW

Delta AC Motor Drive Inverter VFD370F43A VFD-F 50HP 3 phase VARIABLE FREQUENCY

Delta AC Motor Drive Inverter VFD370VL43A VFD-VL series for Elevator 50HP 3

Delta AC Motor Drive Inverter VFD450C23A VFD-C2000 Series 60HP 3 phase 220V 45KW

Delta Comp. (Modicon Comp.) MMC188/41 Motion Controller

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Delta Computer Systems RMC100 with DIO Card

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Delta F DF-150 Oxygen Analyzer 153-5000

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Delta Tau Data Circuit Board 602199-102 602405-101602200-102

DELTA TAU DATA SYS 400-602204-10X OPT-1 USPP 40060220410XOPT1

DELTA TAU DATA SYS 400-602204-10X POI/4A USPP 40060220410XPOI4

DELTA TAU DATA SYS PMAC-1-LITE USPP PMAC1LITE

DELTA TAU DATA SYS PMAC2-VME NSPP PMAC2VME

DELTA TAU DATA SYS PMAC-PC USPP PMACPC

DELTA TAU DATA SYS PMAC-VME USPP PMACVME

DELTA TAU DATA SYS TURBO PMAC2 MOTION CONTROLLER

Delta Tau Data Systems 025-21N-363-000F Turbo PMAC2 CPU Motion Controller

Delta Tau Data Systems PMAC-LITE 56002 Assy 602402-101 V1.16a 20Mhz OPT 4a

DELTA TAU DATA SYSTEMS PMAC-VME CPU MODULE PMACVME

DELTA TAU GEO BRICK LV LOW-VOLTAGE SERVO/STEPPER AMPLIFIER & CONTROLLER P/N GB

DELTA TAU PMAC VME 602199-104 W/ 602273-101

DELTA TAU PMAC VME 602199-104NICE

DELTA TAU PMAC2 VME 602413-101 VME CPU BOARD

DELTA TAU UMAC PMAC2 MOTION CONTROLLER COMPUTER

DELTA TAU UMAC TURBO PMAC2 CPU MOTION CONTROLLER,ACC-24E2,ACC-24E2A,ACC-28E,11E

Delta VARIABLE FREQUENCY AC Motor Drive Inverter VFD370V43A-2 VFD-VE Series 50HP

Delta VARIABLE FREQUENCY AC Motor Drive Inverter VFD450B43A VFD-B Series 60HP

Delta VARIABLE FREQUENCY AC Motor Drive Inverter VFD450CP43A-21 VFD-CP2000 60HP

Delta VARIABLE FREQUENCY AC Motor Drive Inverter VFD450V43A-2 VFD-VE Series 60HP

Delta VARIABLE FREQUENCY INVERTER VFD450F43A 60HP 45KW 3 phase 380V 0.1 ~120HZ

Delta VARIABLE FREQUENCY VFD370B43A VFD-B 50HP 37KW 37000W 3 phase 400HZ

Delta VFD220B43A AC Drive VFD B Inverter 30HP 460V

Delta VFD370B43A AC Drive VFD B Inverter 50HP 460V

Delta VFD450B43A AC Drive VFD B Inverter 60HP 460V

Delta VFD550B43A AC Drive VFD B Inverter 75HP 460V

Delta VFD750B43A AC Drive VFD B Inverter 100HP 460V

DELTA-TAU 115/230 VAC UNIVERSAL POWER SUPPLY TURBO PMAC2; 4-AXIS INTERFACE UMAC

DELTAV 12P1442X032 NSFP 12P1442X032

DeltaV M-series MX Controller by Emerson

DELTEC RSR21/RSR21002-00122200 POWER SUPPLY SYSTEM 2.1KVA 1.4KW 17.5ANIB

Demag / Van Dorn Ergotech Nc4 Compact control card 007 636 66 - 00763666

Demag / Van Dorn Ergotech Nc4 Compact control card 060 386 66 - 06038666

Demag / Van Dorn Ergotech Nc4 Compact control card 067 587 65 - 06758765

DEMAG 240-350-2 USPP 2403502

DEMAG 502001 USPP 502001

DEMAG BRAKE MOTORS AND GEAR SURPLUS

DEMAG FG08 U0-H1-F1 MICROSPEED UNIT 15/.86 kW HP RATIO 19.2:1

DEMAG FG08-B KBA 80 125 11KW 460V 9.9:1 MICROSPEED UNIT GEAR MOTOR D208952

DEMAG FG08-B3-Z1-F1-H1 MICROSPEED UNIT 1.6/7.5 HP RATIO 7.8:1

DEMAG FG08-B5-U0-H1-F1 MICROSPEED UNIT 11/.125 kW HP RATIO 9.9:1

DEMATIC KBF100-B-4 NSFP KBF100B4

DENEX 51E2010 LASER COPYSENSOR EDGE DETECTOR

DENEX 51E3000 NSFP 51E3000

DENEX 51K1000 NSPP 51K1000

DENEX 51L2000 USPP 51L2000

DENEX 51L2010 NSFP 51L2010

DENEX 51L2010 USPP 51L2010

Dengensha Servo Spot Gun 7800071518 Weld Trans R91-445C5S Never Intalled

DENKA TFE Source Fiament No. 1929A (1929-A) 174 SH (174SH) 1745H Emitter

DENKI KOGYO TRANSFORMER DST-500SSURPLUS

DENSAN DCP586/11(9390C) XLT

DENSAN DVE 7447/50,(MPC7447A) PROCESSOR BOARD

DENSO 6 AXIS ROBOT VSS-6354 CM/CONTROLLER RC3-V6A/ TEACING PENDANT TP3/CABLES

DENSO 6 AXIS ROBOT VSS-6354 CM/CONTROLLER RC3-V6A/ TEACING PENDANT TP3/CABLES/YE

Denso RC3-C4AB RC3C4AB 410000-5460 Robot Controller U

Denso RC3-V6A Robot Controller RP-192 Software 9.61 Type VS-6354C-W

DENSO ROBOT CONTROLLER RC7M-WLBA,410200-1220,MP7ME3P4 TEACH PENDANT

Denso Teach Pendant TP-RC 7/8

Denver Instrument IR-200 ?

Denver IR200 Moisture Balance

DERRICK CORP LARGE VIBRATION MOTORS #C75-18-460V

DERRICK CORPORATION Super G ? Vibrating Motors SGX-38-18-460/480-6

Design Componets Inc. motorized stage CC - 77 , 8" x 10" table

Desktop Automatic mounter PT-200

Desktop Automatic mounter PT-400V

Desktop USB Spectrum Analyser 10MHz - 6GHz

DESOUTTER 92292 NSFP 92292

DESOUTTER 92292 USPP 92292

Despatch EC605

Despatch LAC1-67-5

DESTACO K1000-50-7-1 USPP K10005071

DESTACO PM4-E3754-ND40-AAMA-AAMA-0 POWER PIVOT,

DESTACO PM4-R304-RD51-MAAA-MAAA POWER PIVOT, SERIES 4,

DESTACO PM4-R304-RD51-MAAA-MAAA-0 POWER PIVOT, SERIES 3,

Destaco SLA-120-800 Smart Linear Actuator

Desuper Heater Assembly & Soot Blower Element PN:1492-635-20 Blw PN: 807

DETCON MODEL 210AFB MODEL 10A O2 MONITOR 210A-FB 4511 REV 4 DO4556 REV 1

Detection Technology X-Scan F2-0.8-410 X-ray subsystem

DETLA frequency converter VFD-550F43A 380V 55KW for industry use

DETLA frequency converter VFD-750F43A 380V 75KW for industry use

DETRONICS 003436-001 NSFP 003436001

DETRONICS C7052J5000 NSFP C7052J5000

DETRONICS EQ3730DW USPP EQ3730DW

DETRONICS R7404-B7001 USPP R7404B7001

DETRONICS R9105-P5002 USPP R9105P5002

DET-TRONICS R7300B3111 ULTRAVIOLET FIRE DETECTION SYSTEM R7300B3111

DET-TRONICS RELAY OUTPUT MODULE R6006A2001

Deutsche Star Type 0360-300-00 & 0360-400-00 XY Table Linear Actuators Rexroth

DEV KIT, CC2431, ZIGBEE, 2.4GHZ, CC2431ZDK 1573882

DEV KIT, FOR I.MX31, MCIMX31ADSE/C 1579877

Deviser NA7100/7300 Vector Network Analyzer 12 Mos

Deviser NA7300A Vector Network Analyzer 300kHz - 3GHz, 50 Ω

Deviser NA7300B Vector Network Analyzer 300kHz - 3GHz, 75 Ω

DEWALT 84976 WORM WHEEL 10X10X4 BRASS GEAR REDUCER REPLACEMENT PART B210653

DEWETRON DEWE2012 32ch 16bit Multi Media Data Logger

DEWETRON DEWE5000 16ch 24bit Multi Media Data Logger

Dewetron VGPS-200 VGPS GPS System Speed & Displacement (2013 SALE )

Dexter Magnetic FO-703.5-3 FO70353 Dexter JIG U

DEZURIK 1055821-V-603 600189CG791 CONSISTENCY TRANSMITTER 190RPM 460V 42233

Dezurik 12" basis Weight Valves

DEZURIK 870020-013-11-13-01-07-00 ELECTRO-PNEUMATIC

DEZURIK 870020-014-11-13-01-07-00 ELECTRO-PNEUMATIC

DEZURIK 9184319 PLUG VALVE UNIT 450F PLUG-316

DEZURIK 9318141 USPP 9318141

Dezurik Control Valve 16"

D-F CORPORATION MAIN POWER RELAY # 3433-AY2-B NSN: 5945-01-173-7998

D-frame VLT High Power Drives Frequency Converter

DFV180M4 SEW EURODRIVE GEARBOX

DG535 (SRS) Pulse Generator Delay Channel

DGD Cooper DC Brushless Motor / Nutrunner Motor 1BA 927255 _ 1BA927255

DGD Electric Motor / Nutrunner Motor 3 BA 927257_3BA927257

DGD GARDNER DENVER 2BA 2B150A 2K2A 2ZA REMAN

DI-1M-200A Air Tool & Impact Wrench Digital Torque Tester, 1800 lbf-in, 110V

DI-1M-200A Air Tool & Impact Wrench Digital Torque Tester, 1800 lbf-in, 220V

DIAGRAPH 5760012PDP

DIAGRAPH 5760012SDP

DIAGRAPH 8701-975 NSFP 8701975

DIAGRAPH 8701-975 USPP 8701975

DIAGRAPH IDS3000 INK JET 5760012SDP

DIAGRAPH IJ3000XLS INK JET CONTROLLER 576009SV2D

DIAGRAPH IV9DOT-7/8" INK JET PRINTHEAD 5772002N875

DIAGRAPH IV9DOT-7/8" INK JET PRINTHEAD 5772002P875

DIAGRAPH KS02106-001 NSFP KS02106001

Dialogic D/600JCT-2E1-75- R2U( D600JCT2E175)

DIALOGIC DM/V960-4T1-CPCI USPP DMV9604T1CPCI

DIAMOND Automatic E2000 Fiber Connector Cleaver, Prepolisher Integrated Scope

Diamond Engineering DAMS6000 / DAMS 6000

DIAMONEX INC DUAL STARTER POWER SUPPLY VOLT & AMMETER

Dicon GP700

Dicon GP700 (J) Fiber Optic Switch, 5 port

Dicon GP700 15x15
Dicon GP700 16x16

Dicon GP700 2x(1x16)

Dicon GP700 Fiber Optic Switch 32 (1X2)

Dicon GP700 Fiber-optic Switch

DiCon GP700 General Purpose Fiber Optic Switch Platform GP-700 GP 700

Dicon GP700 General Purpose Fiberoptic Switch

DiCon GP700 Programmable Fiber Multi Switch 1x2

DiCon GP700 Programmable Fiber Multi Switch 1x32,1x4

DiCon GP700 Programmable Fiber Multi Switch 1x32,2x1x4

Dicon GP700 w/ 4x4 Single Mode Matrix Switches - Mint

Dicon GP700-12x12

Dicon GP700-1x12

Dicon GP700-8x8

Dicon GP700M FiberOptic Switch Mainframe (Config2)

Dicon GP700M FiberOptic Switch Mainframe (Config3)

DiCon GP700M Modular Mainframe

Dicon GP700M Modular Mainframe (4U)

Dicon GP700M Modular Mainframe (4U) with Rear Optical Panel

DiCon GP700M Programmable Fiber Multi Switch 1x4

DiCon Multi-Channel Fiberoptic Switch S1-10-200-SMA-B