Tinh Toan Cho FAN Pump

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Tính toán Fan and pump

Transcript of Tinh Toan Cho FAN Pump

  • Inverter ApplicationFor FAN/Pump

  • Load Characteristic

    Load Characteristic

    Speed

    Torque

    Reduced torque

    Note:Vacuum Pump has different characteristic

    Constant Torque loadWinding-Traverse

  • Acceleration ta Available to get 120% rated torque

    ta=[JNmax][9.55(1.2Tm-TL)] in acceleration,it is not necessary to set a large value.

    Deceleration td The torque is about 10 to 20 %

    td=[JNmax][9.55(0.1*Tm+TL)] in deceleration,and the Fan which haslarge inertia should be set a long time

    for a deceleration.

    Calculation for Acceleration/Deceleration

    JAll inertia on motor shaft (kg.m2NmaxMaximum revolution(rpm)TmRated motor torque(N.m) TL Load torque(N.m) for the calculation of deceleration time,TL=0

  • Brake unit register) selection procedure

    Calculation of deceleration time Tb=[JNmax][9.55tb] Tbrequired del. torque (Nm)

    tblimit of del.. Time(sec)Regenerated power Pb=0.105NmaxTb (w)

    Calculation of regeneration of Register (Rb) Rb=VPN2[1.2Pb] (VPN 200Vclass:350V

    400Vclass :700V

    Selection of regenerated register value and typeCalculate %ED(ratio of continuous usage ,compare the specification of register.

    Selection of BRD unit Inverter model has integrated BRD model and no equipment model.

    In case of equipment model, selectproper register type.

  • Easy reducing procedure for acceleration time

    Rev

    olu

    t io n

    N1

    Nmax

    td1

    tdN1 Nmax

    TL1

    Range of standard use

    td1=[J(Nmax-N1)][9.55(0.1Tm+TL1)] Possible to set the deceleration time until lower load torque.

    terminal SET for 2 step acceleration

  • The function for FAN Pump application Control MethodControl Method V/F Control V/F constant control(V

    characteristic)

    V/F reduced torque (VP F1.7)

    V/F free setting (desired characteristic)

    Energy saving drive

    Vector control Vector control with an EncoderSensor less Vector Control without

    an Encoder

    Control Method for FAN and Pump

    Control Method for Carriers and Lift

  • Auto save energy drive

    Auto save energy driveP

    ower

    Driving Frequency

    Automatically adjusted to save energy

    Normal V/F drive Auto save drive

  • Limit of driving range Frequency limitter

    Frequency limitter function

    Ou

    tpu

    t fr

    e qu

    ency

    Frequency command

    fHLIM

    fLLIM

    Available to set a upper and lower limit of frequency even analog input is not in

    upper fHLIMlower fLLIM

  • Limit of driving range External Frequency command

    a.Start Frequency enableOu

    tput

    Frequen

    cy

    Frequency Command

    OS OE

    Even if analog input signal for frequency command is 0 Hz,Start Frequency will be fs.

    O-L input active range for start frequency

    O-L input active range for end frequency

    O-L input active range for start voltageOS

    O-L input active range for end voltageOE

  • b. Start Frequency enable

    Limit of driving range External Frequency command

    OS OE

    Output

    Frequen

    cy

    Frequency Command

    If analog input signal is lower than Os[v], Inverter will not start, and if input exceed Os, inverter will start with fs.

    O-L input active range for start frequency

    O-L input active range for end frequency

    O-L input active range for start voltageOS

    O-L input active range for end voltageOE

  • For avoiding machine vibration or noise by resonance,inverter can avoid the resonance frequency in acceleration and deceleration.

    Avoid of resonance:Jump frequency

    Escape zone for resonance

    Output frequency

    Frequency command

    Available to set 3 frequency.

    Jump frequency setting1Jump frequency setting2Jump frequency setting3Jump frequency width setting1Jump frequency width setting2Jump frequency width setting3

  • Automatic Restart-1 Accordance with peripheral unit

    setting param eter A ctivityAllowable under-voltage power failure timeb002

    This setting is no influence to peripheral units, set a time for restart . If instantaneous time is over than this time, inverter is trip not to give any influence to peripheral units.

    Retry wait time before motor restart(b003)

    For the setting on this parameter, all peripheral unit received reset signal after recover the power failure.The setting value is the waiting time for reset signal receipt. If this time setting is too short, inverter may be over current trip.

    Instantaneous powerfailure/under-voltage trip events(b004)

    In case of automatic restart is not proper system, inverter is just trip after power failure happened. No use of automatic restart.

  • Automatic Restart- Restart procedure)

    Restart procedure after power failure recovered,it decided, by load torque or inertia characteristic,and motor revolution drop level when power failure occurred.

    Load Inertia Loadtorque

    Revolution drop

    proper control

    FAN big small small after frequencymatching,restart

    Pump small big big 0Hz start

  • Countermeasure of motor revolution drop when motor restart

    Pump

    Revolution drop

    Pressure drop

    System down

    Counter measure

    After recover power supply,quick restart

    Set short time for retry wait timebefore restart

    Possibility of over current trip

    Low inertia&

    heavy load

  • Cause of over current trip - Motor residual voltage

    V=V0exp[-1/T2t]exp[jrt]T2Motor time constant

    r Motor angular speedrevolution

    Cut off out put frequency

    Motor residual voltage attenuation characteristic

    The motor residual voltage attenuation characteristic After power off, high

    voltage is remaining in short time

  • Cause of over current trip -2 Motor residual voltage

    Secondary constants on standard motor (4P)

    M otor(kw) Tim e constant (s) M otor(kw) Tim e constant (s) 3.7 0.12 30 0.58 5.5 0.12 37 0.79 7.5 0.13 55 0.84 11 0.22 75 0.89 15 0.37 110 1.19 22 0.50

  • Cause of over current trip-:Short circuit at IGBT

    Short Circuit Mode

    Motor

    residual voltage

    Short circuit flow

    InverterIGBT part

    Active on all upper IGBT

    Inverter ApplicationFor FAN/Pump

    Load Characteristic

    Load Characteristic

    Speed

    Torque

    Reduced torqueNote:Vacuum Pump has different characteristic

    Constant Torque loadWinding-Traverse

    AccelerationtaAvailable to get 120% rated torqueta=[JNmax][9.55(1.2Tm-TL)] in acceleration,it is not necessary to set a large value.

    Deceleration td The torque is about 10 to 20 % td=[JNmax][9.55(0.1*Tm+TL)]in deceleration,and the Fan which haslarge inertia should be set a long timefor a deceleration.

    Calculation for Acceleration/Deceleration

    JAll inertia on motor shaft (kg.m2NmaxMaximum revolution(rpm)TmRated motor torque(N.m) TLLoad torque(N.m) for the calculation of deceleration time,TL=0

    Brake unit register) selection procedure

    Calculation of deceleration time Tb=[JNmax][9.55tb] Tbrequired del. torque (Nm) tblimit of del.. Time(sec)Regenerated power Pb=0.105NmaxTb(w) Calculation of regeneration of Register (Rb) Rb=VPN2[1.2Pb] ( VPN 200Vclass:350V 400Vclass :700V Selection of regenerated register value and type Calculate %ED(ratio of continuous usage , compare the specification of register. Selection of BRD unit Inverter model has integrated BRD model and no equipment model. In case of equipment model, select proper register type.

    Easy reducing procedure for acceleration time

    Revolution

    N1

    Nmax

    td1

    td

    N1 Nmax

    TL1

    Range of standard use

    td1=[J(Nmax-N1)][9.55(0.1Tm+TL1)] Possible to set the deceleration time until lower load torque.

    terminal SET for 2 step acceleration

    The function for FAN Pump application

    Control MethodControl Method V/F Control V/F constant control(V characteristic) V/F reduced torque (VP F1.7) V/F free setting (desired characteristic) Energy saving drive

    Vector control Vector control with an Encoder Sensor less Vector Control without an Encoder

    Control Method for FAN and Pump

    Control Method for Carriers and Lift

    Auto save energy drive

    Auto save energy drive

    Power

    Driving Frequency

    Automatically adjusted to save energy

    Normal V/F drive

    Auto save drive

    Limit of driving rangeFrequency limitter

    Frequency limitter function

    Output frequency

    Frequency command

    fHLIM

    fLLIM

    Available to set a upper and lower limit of frequency even analog input is not in

    upper fHLIMlower fLLIM

    Limit of driving range External Frequency command

    a.Start Frequency enable

    Output Frequency

    Frequency Command

    OS OE

    Even if analog input signal for frequency command is 0 Hz, Start Frequency will be fs.

    O-L input active range for start fr