【液壓精品培訓資料】派克：基本的數字電液控制裝置液壓ppt課件

1、CHAPTER 16BASIC DIGITAL ELECTROHYDRAULIC DEVICESFigure 16-1 Sine waveCOPYRIGHT(2001) EATON CORPORATIONC0+V-VSine WaveFigure 16-2 Random AC voltageCOPYRIGHT(2001) EATON CORPORATIONC0+V-VTimeRandom VoltageFigure 16-3 Varying negative DC voltageCOPYRIGHT(2001) EATON CORPORATIONC0+V-VTimeTimeNegative DC

2、Figure 16-4 Digital signalsCOPYRIGHT(2001) EATON CORPORATIONC0+V-VTimeDigital SignalFigure 16-5 Basic relay constructionCOPYRIGHT(2001) EATON CORPORATIONC24 vdcCRSymbolSymbol112233445566N.O.N.O.N.CN.CN.O.CN.C.456N.O.CN.C.456N.O.CN.C.123N.O.CN.C.123Coil OnCoil OffCoil OnFigure 16-6 115 volt, single p

3、hase circuit is used to control a 480 volt, three-phase motorCOPYRIGHT(2001) EATON CORPORATIONCABCDEFGLine115 VACMCRFuse1Circuit PowerOnOffN.O.SW12ReturnMCR-2N.O.SW2ManualStopN.C.ManualStartN.O.SW 3Seal-inContactN.O.1M-1Safety GateClosed1M01O.L.02O.L.03O.L.N .C .N .C .N .C .MotorStarter1LSN.C.5436GN

4、.O.6“Motor OnPush to TestTo Terminal 31M-3RN.C.6“Motor OffPush to TestTo Terminal 31M-2MCR-1N.O.Figure 16-7 Comparison between relays and microprocessorsCOPYRIGHT(2001) EATON CORPORATIONCSpeedCostPower UseNumber of ComponentsRequiredSizeFlexibilityRELAYSSlow response (milliseconds)$50 and upWattsTho

5、usands ofrelays0.1 - 6 cubic inchesSingle functionMICROPROCESSORSFast response (microseconds)$7.50 to $20Milliwatts= 1 microprocessorLess than 0.1 cubic inchesHundreds of functionsFigure 16-8 Block diagram of a microprocessor based electrohydraulic closes loop control systemCOPYRIGHT(2001) EATON COR

6、PORATIONC12V DC PowerPower ConditioningAnalogSensorsSignalConditioningA/DD/AAnalogActuatorsSignalConditioningMicro-ProcessorFigure 16-9 Programming logic controllerCOPYRIGHT(2001) EATON CORPORATIONCProgrammable Logic ControllerProcessingUnit(CPU)Input and Output modulesFigure 16-10 PLC ladder diagra

7、m for relay logic circuitCOPYRIGHT(2001) EATON CORPORATIONCLINE1234100Motor Off100Motor OnStop 010Start 011Safety Gate 0121M100Green Light101Red Light101Motor OnFigure 16-11 PLC wiring diagram for relay logic circuitCOPYRIGHT(2001) EATON CORPORATIONCGR010011012013014015016017INPUTCARDStopStart115 VA

8、CReturn100101102103104105106107OUTPUTCARD115 VACReturnPLC1MGateFigure 16-12 Modem used for data transmissionCOPYRIGHT(2001) EATON CORPORATIONCMPUBUSParallelI/OCardUARTModemModemUARTParallelI/OCardBUSMPUTelephone or Dedicated LineFigure 16-13 Serial data transmissionCOPYRIGHT(2001) EATON CORPORATIONC

9、SenderReceiverStop BitMeans “This is theend of this word”STOP01111001STARTSerial transmission of digital byte 101011102Start BitMeans “Here comessome dataFigure 16-14 Parallel transmission dataCOPYRIGHT(2001) EATON CORPORATIONCSenderReceiverRequestAcknowledgeOnOffOnOnOnOnOffOff2222222210111100765432

10、10Figure 16-15 Simple electrical AND circuitCOPYRIGHT(2001) EATON CORPORATIONCPowerSupplyMotor+S1S2Both S1 and S2 must be closed before motor can runFigure 16-16 Simple hydraulic equivalent of AND controlCOPYRIGHT(2001) EATON CORPORATIONCHydraulic equivalent “AND circuit. Both valves must be opened

11、to run motorManualValve AManualValve BFigure 16-17 Digital AND circuitCOPYRIGHT(2001) EATON CORPORATIONCCondition ACondition B“AND” gate symbolEither S1 OR S2 must be closed before motor can runFigure 16-18 Simple electrical OR circuitCOPYRIGHT(2001) EATON CORPORATIONCPowerSupplyMotor+S1S2Hydraulic

12、equivalent “OR” circuit. Either valve A or B must be opened to run motorFigure 16-19 Simple Hydraulic equivalent OR circuitCOPYRIGHT(2001) EATON CORPORATIONCManual Valve AManual Valve BFigure 16-20 Digital OR circuitCOPYRIGHT(2001) EATON CORPORATIONCDigital “OR” circuit. Valve energized by condition

13、 A or BCondition ACondition B“OR” gate symbolMFilter 1Filter 2Valve 1Valve 2p= Differential Pressure Switch. Normal condition = Clean Filter = Low Differential PressureContacts time delayed to avoid triggering due to pressure surges.Valves 1 and 2 are = Solenoid operated, spring offset with monitor

14、switch.Switch off = Valve off = Oil flow to filter off.The above circuit will be interlocked to automatically switch to a clean filter and to shut down the motor if both filters are dirty.Figure 16-21 Machine interlock circuitpCOPYRIGHT(2001) EATON HYDRAULICSCpTo Hydraulic SystemFigure 16-22 Ladder

15、diagram of machine interlock circuitCOPYRIGHT(2001) EATON CORPORATIONCABCDE115 VACPum pStop1TD R1MPB2Pum pStartPB11M -1Val ve 1 O nVal ve 2 O n01 02 0334Pum pStart2TD R3C R4C R1212ReturnFi l ter 1RunM ai nt.1234SW 1Fi l ter 2RunM ai nt.1234SW 2Fi l ter 2Fi l ter 1RunM ai nt.5678SW 1SW 25678PB11TD R-

16、1P22TD R-1P13C R1P24CR13CR24CR23CR34CR31TDR-23CR44CR42TDR-2Val ve 1Sel ected1 Second O ff-D el ayVal ve 2Sel ected1 Second O ff-D el ayFi l ter 1D i rtyFi l ter 2D i rtyReplaceFilter 1ReplaceFilter 2Dirty FilterShutdownBoth FiltersCleanValve 1SolenoidValve 2SolenoidFGKLMNPQRSTUTDRInput SignalInstant

17、aneous ContactDelayed ContactOnOffOnOnOffOffOffDelayWhen the coil is de-energizedthe instantaneous contact reactslike a normal relay contact;the delayed contact remains on for thedelay time period, then de-energizes.TIME OFF-DELAY RELAYM otorStartedP1P21TD R-2RunM ai nt.TimeYYYYFigure 16-23 Binary a

18、nd decimal equivalentsCOPYRIGHT(2001) EATON CORPORATIONC01234567891011121314150000000100100011010001010110011110001001101010111100110111101111BINARYDECIMALFigure 16-24 Bit positions valuesCOPYRIGHT(2001) EATON CORPORATIONC1101101 2MSBLSBPOSITIONWEIGHTVALUEDIGIT324089771063,000,0006105200,000510440,000410303102800210190110073,240,897 Denotes base of number system10DECIMAL NUMBERBINARY NUMBERPOSITIONWEIGHTVALUEDIGIT