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Operating ModesVector V/f control (r0108.2 = 0)3.3 Vector V/f control (r0108.2 = 0)The simplest solution for a control procedure is the V/f curve, whereby the statorvoltage for the induction motor or synchronous motor is controlled proportionatelyto the stator frequency. This method has proved successful in a wide range of applicationswith low dynamic requirements, such as: Pumps and fans Belt drivesand other similar processes.V/f control aims to maintain a constant flux φ in the motor, whereby the flux is proportionateto the magnetization current Iµ or the ratio of voltage (U) to frequency(f).φ ∼ Iµ ∼ U/fThe torque (M) generated by the induction motors is, in turn, proportionate to theproduct (or, more precisely, the vector product φ x I) of the flux and current.M ∼ φ x ITo generate as much torque as possible with a given current, the motor must functionusing the greatest possible constant flux. To maintain a constant flux (φ), therefore,the voltage (V) must also be changed in proportion to the frequency (f) toensure a constant magnetization current (Iµ). V/f characteristic control is derivedfrom these basic premises.V, M, ΦPoint of motorVM n, Φ nVM, Φf nf maxVoltage rangeField rangefuf_steuerung.vsdFig. 3-43Operating areas and characteristic curves for the induction motor with convertersupplySeveral variations of the V/f characteristic exist, which are shown in the followingtable.3-158© Siemens AG 2006 All Rights ReservedSINAMICS S120 Function Manual, 03/2006 Edition
Operating ModesVector V/f control (r0108.2 = 0)Table 3-19V/f characteristic (p1300)ParametervaluesMeaning0 Linear characteristic Standard (w/o voltageboost)Application / propertyVV n0p1300 = 0uf_p1300_0.vsdf nf1 Linear characteristicwith flux current control(FCC)Characteristic thatcompensates for voltagedrops in the statorresistance for static /dynamic loads (fluxcurrent control FCC). Thisis particularly useful forsmall motors, since theyhave a relatively highstator resistance.VV maxr0071p03040dependentfp0310uf_p1300_1.vsdLoad current2 ParaboliccharacteristicCharacteristic that takesinto account the motortorque characteristic(e.g. fan/pump).a) Quadraticcharacteristic(n 2 characteristic)b) Energy savingbecause the low voltagealso results in smallcurrents and drops.VV n0p1300 = 2f nuf_p1300_2.vsdf3 ProgrammablecharacteristicCharacteristic that takesinto account the motor /machine torquecharacteristic(e.g. synchronous motor).p1325VV maxr0071p1327p1323uf_p1300_3.vsdp1321r13150f1p1320f2 f3 f4p1322p1324p1326ffmaxp1082© Siemens AG 2006 All Rights ReservedSINAMICS S120 Function Manual, 03/2006 Edition3-159
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Function Manual 03/2006 Editionsina
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Safety information/instructionsThis
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ForewordTable F-1Useful phases and
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ForewordTechnical supportIf you hav
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ForewordESD information!CautionAn e
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Foreword!Caution The surface temper
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Table of Contents3.1.10 Sensorless
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Table of Contents4.24.3 Referencing
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InfeedActive Infeed1.1 Active Infee
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InfeedActive InfeedOperating modes
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InfeedActive InfeedIdentification m
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InfeedActive InfeedSwitching off th
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InfeedActive InfeedExample: setting
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InfeedSmart InfeedConnection diagra
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InfeedSmart Infeed1.2.2 Line and DC
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InfeedSmart InfeedSwitching on the
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InfeedBasic Infeed1.3 Basic Infeed1
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InfeedBasic InfeedSwitching on the
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InfeedLine contactor control1.4 Lin
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Operating ModesServo controlParamet
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Operating ModesServo controlFixed a
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Operating ModesServo controlCurrent
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Operating ModesServo controlLow-pas
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Operating ModesServo controlParamet
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Operating ModesServo controlStructu
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Operating ModesServo controlSwitcho
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Operating ModesServo controlMotor d
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Operating ModesServo controlInducti
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Operating ModesServo controlSynchro
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Operating ModesServo controlMotor M
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Extended FunctionsMotor changeoverO
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Extended FunctionsMotor changeoverT
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Extended FunctionsSimulation mode (
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Extended FunctionsParking axis and
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Extended FunctionsBoot with partial
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Extended FunctionsBoot with partial
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Extended Functionsdv/dt filter plus
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Extended FunctionsFlying restart (v
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Extended FunctionsArmature short-ci
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Extended FunctionsArmature short-ci
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Extended FunctionsSwitching-in a dr
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Extended Functions“Braking Module
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Extended FunctionsFunction module
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Extended FunctionsFunction module p
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Extended FunctionsBypass (vector)Co
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Extended FunctionsSynchronization (
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Extended FunctionsTerminal Module 4
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Extended FunctionsTerminal Module 4
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Extended FunctionsChanging over uni
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Extended FunctionsApplication examp
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Extended FunctionsApplication examp
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Extended FunctionsPosition tracking
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Extended FunctionsPosition tracking
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Basic Information about the Drive S
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Availability of SW FunctionsTable A
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Availability of SW FunctionsTable A
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List of AbbreviationsAbbreviation G
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List of AbbreviationsNotesB-338© S
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ReferencesInteractive catalogs/CA01
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References/PFT6S/SINAMICS Synchrono
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ReferencesNotesC-344© Siemens AG 2
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IndexExtended torque control, 3-80F
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IndexTorque control, 3-137Extended,
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Overview of SINAMICS Documentation
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