Toshiba VF-S9 manual Extremely low loads and low inertia loads, Occurrence of instability

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E6580757

Extremely low loads and low inertia loads

The motor may demonstrate instability such as abnormal vibrations or overcurrent trips at light loads of 50 percent or under of the load percentage, or when the load's inertia moment is extremely small. If that happens reduce the carrier frequency.

Occurrence of instability

Unstable phenomena may occur under the load and motor combinations shown below.	1
Combined with a motor that exceeds applicable motor ratings recommended for the inverter
Combined with special motors such as explosion-proof motors

To deal with the above lower the settings of inverter carrier frequency. (Do not set to 2.2kHz or lower during vector control).

Combined with couplings between load devices and motors with high backlash

In this case, set the S-pattern acceleration/deceleration function and adjust the response time (inertial moment setting) during vector control or switch to V/f control.

Combined with loads that have sharp fluctuations in rotation such as piston movements

In this case, adjust the response time (inertial moment setting) during vector control or switch to V/f control.

Braking a motor when cutting off power supply

A motor with its power cut off goes into free-run, and does not stop immediately. To stop the motor quickly as soon as the power is cut off install an auxiliary brake. There are different kinds of brake de- vices, both electrical and mechanical. Select the brake that is best for the system.

Loads that generate negative torque

When combined with loads that generate negative torque the protection for overvoltage and overcurrent on the inverter will go into operation and may cause a trip. For this kind of situation, you must install a dynamic braking resistor, etc. that complies with the load conditions.

Motor with brake

If a motor with brake is connected directly to the output side of the inverter, the brake will not release because voltage at startup is low. Wire the brake circuit separately from the motor's main circuits.

MC2 (Non-exciting brake)

MC1
Three-phase	FLB FLC ST	CC
power supply		MC3
		MC3
MC1		MC3
		MC3
MC3		MC2
		MC2

B

IM

MC1

Three-phase power supply

MC2

B

IM

RY RC

MC2

Circuit Configuration 1Circuit Configuration 2

In circuit configuration 1, the brake is turned on and off through MC2 and MC3. If the circuit is config-

A-11

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Contents Tosvert VF-S9 Contents E6580757 Iii Safety precautions Safety precautionsMeanings of symbols Explanation of markingsGeneral operation Transportation ‚ Installation WiringOperations When retry function is selected inverter Maintenance and inspectionDisposal Attach warning labelsFeatures II. IntroductionCheck product purchase Read firstMandatory Contents of the product code Names and functions Outside viewCharge lamp Terminal board coverE6580757 Main circuit and control circuit terminal boards 2022PL2015PM VFS9-2022PM/2037PM VFS9-4007PL ∼ 4037PLVFS9-2055PL/2075PL 4055PL/4075PL How to open the front terminal board cover See 2.3.2 for details on all terminal functionsMotors Occurrence of instability Braking a motor when cutting off power supplyExtremely low loads and low inertia loads Loads that generate negative torqueProtecting inverters from overcurrent Power factor improving capacitorsInverters Inverter capacityCircuit interupting fuse What to do about leak currentEffects of leak current across ground MCCBn+1 INVnFfects of leak current across lines PowerRemedies SupplyUse the electronic thermal built into the inverter Continuous operation this may result in fire InstallationInstallation environment Not examples for resistance to fire or explosionConsult with Toshiba about these measures How to install Installation locationCabinet must be ventilated and cooled Inverter TypeInstalling more than one unit in a cabinet Connection equipment Wiring Control and main power supplyPreventing radio noise Standard connections Standard connection diagram 1 sink common CC This diagram shows a standard wiring of the main circuitStandard connection diagram 2 source common P24 VF-S9Main circuit terminals Power supply and motor connectionsDescription of terminals Connections with peripheral equipmentControl circuit terminals sink logic Main circuitPut. Standard default setting output cur 1mA full-scale dc Input Standard default setting 0~10Vdc input Internal imped~60Hz60Hz setting frequency By jumper JP302 switching Full scale DC amOutput Detects the operation of the inverters 30Vdc-1A Multifunction programmable relay contact= 1, 30Vdc-1A, 250Vac-1A cos φ = At resistance load During protection function operationInput Common Output Logic switching/voltage-current output switching jumper Operations Motor How to operate the VF-S9Wiring Main circuitE6580757 Mccb Motor Simplified Operation of the VF-S9 Adjustment rangeMonitor display selection Is set to How to start and stop How to set the frequencyMoves the frequency down Setting the frequency using the operation panelExample of operating a run from the panel PotentiometerE6580757 Basic VF-S9 operations Setting monitor mode Mode for setting inverter parametersStatus monitor mode Mode for monitoring all inverter status VF-S9 has the following three monitor modesHow to set parameters Setting monitor modeHow to set the basic parameters Press the Enter key to save the changed maximum frequencyHow to set extended parameters Key and the key to selectExample of parameter setting Search and resetting of changed parametersKey to change the dynamic braking selection from How to search and reprogram parameters How to program setup parameters Command mode selection Set , and and can Returning all parameters to standard default settingParameters that cannot be changed while running Key or the key to change the set value. To return to Key operated LED display OperationPressing the Enter key displays Automatic acceleration/deceleration Setting acceleration/deceleration timeBasic parameters Set automatic acceleration/deceleration to orAcceleration time Seconds Manually setting acceleration/deceleration timeParameter setting Title Function Adjustment range Deceleration time SecondsIncreasing starting torque Automatic torque boostIf auto-tuning error Appears, see 6.13 Automatic torque boost and V/F control mode selectionSet V/F control mode selection to 0 V/F constant AutoAutomatic environment setting Setting environmental protectionSetting parameters by operating method Automatic function settingVIA/II UP/DOWN Command mode selection Selection of operation modeCommand mode selection Frequency setting mode selection Title Function Adjustment rangePreset-speed operation Meter setting and adjustmentMeter selection Meter adjustment Example of 4-20mA programmed output for details, see Adjustment scale with meter adjustment parameterResolution Connect meters as shown belowDefault setting Standard default settingAdjusting the meter in inverter stop state Tion Is set toSelecting forward and reverse runs operation panel only Setting valuesParameter setting Forward/reverse run selectionMaximum frequency Maximum frequencyUpper limit and lower limit frequencies Upper limit frequency Lower limit frequencyBase frequency Base frequencyBase frequency 25 ∼ 400 Hz Time Selecting control modeControl mode selection SelectionConstant torque characteristics general method of use Setting for fans and pumpsMotor constant must be set Setting V/F control selection Automatic torque boostIncreasing starting torque This gives steady torque for stable runsSorless vector control Precautions on vector controlEnergy-saving Somewhat lowerManual torque boost increasing torque at low speeds Setting the electronic thermalTorque boost Protection Stall Title Function Adjustment range Default settingOverload Motor electronic thermal proSetting of motor electronic thermal protection level Default setting 100% Press Key to change the parameter toSetting the motor electronic thermal protection level Setting value Overload protection Overload stallPreset-speed operation frequencies 1~7 Preset-speed operation speeds in 15 stepsInverter over load characteristics Preset-speed operation frequencies 8~15Terminal functions are as follows Terminal S1 Preset-speedS3-CC =6 SS1Using other speed commands with preset-speed command Example of 7-step speed operationLow-speed signal output frequency ∼ Hz Low-speed signalLow-speed signal output frequency Extended parametersParameter setting of output terminal selection Output of designated frequency reach signalSpeed reach detection band Parameter setting of set frequency and detection band Output of set frequency speed reach signalSpeed reach setting frequency Speed reach detection band Title Function Adjustment range SettingChanging the standby signal function Input signal selectionST standby signal selection Setting the reset signal Modifying input terminal functions Terminal function selectionKeeping an input terminal function always active on Always-active function selectionInput terminal selection 3 RST Reset Setting of contact input terminal functionTerminal Title Function Adjustment range Default setting Connection method Contact input Sink logicSink logic/source logic input Example of application ... Three-wire operationCase of three-wire operation Set to Input terminal selectionExamples of application Setting of output terminal functionModifying output terminal functions Output terminal selectionSetting of switching terminals Switching motor characteristics via terminal inputBasic parameters Automatic frequency switching Frequency priority selectionExternal contact UP/DOWN External switching Fchg enabledSet frequency is cleared automatically after power-off Contact input. SeeSetting frequency command characteristics 10Vdc voltage input adjustment VIA, VIB 20mAdc current input adjustmentSample sequence diagram 1 Adjustment with continuous signals Adjustment with pulse signals Parameter-setting exampleMinimum unit of frequency adjustment Sample sequence diagram 2 Adjustment with pulse signalsFrequency adjustment range Simultaneous inputStarting frequency Starting frequency settingOperation frequency Function Frequency set with the parameterDC braking 2 Run/stop control with frequency setting signalsDC braking Jog run frequency Jog run stopping pattern Jog run modeDC braking time 20.0 sec Jog run setting Jump frequency jumping resonant frequencies Jump frequency Jumping width Jump frequency 3 Jumping widthRandom mode Preset-speed operation frequency 8 to∼ Preset-speed operation frequency 8 to PWM carrier frequencyAuto-restart Restart during coasting Trip-less intensificationAuto-restart control selection Restarting motor during coasting Motor speed search function DC braking during restartIf momentary power failure occurs Regenerative power ride-through controlRegenerative power ride-through control ApplicationRetry function Canceling conditionsRetry selection Dynamic regenerative braking Dynamic braking selection Braking resistor operation rateParameter setting Title Function Connecting an external braking resistor optionalSeparate-type optional resistor with thermal fuse Setting the braking resistor operation rate Minimum resistances of connectable braking resistors 12.5 Avoiding overvoltage trippingOvervoltage limit operation Output voltage adjustment/Supply voltage correction To the base frequency So that noOutput voltage unlimited 100.0 Integral gain Conducting PI controlExternal connection 100.0Gain adjustment parameter Setting PI controlAdjusting the PI control gain level Types of PI control interfacesAdjusting analog command voltages Set the auto-tuning parameter to Setting motor constantsSelection 1 Setting by automatic torque boost See .2 for details of the setting methodRameters Auto-tuning Application of individual settings Perform adjustments according to the actual operation To the actual operationDeceleration time 3600 s Acceleration time 3600 sAcceleration/deceleration patterns Linear acceleration/decelerationSwitching to acceleration/deceleration Selection using parametersSetting motor electronic thermal protection Protection functionsStall prevention level Setting current stallInverter trip retention Inverter trip retention selectionIs set to Emergency DC braking, also set External input trip stop mode selectionExternal trip stop via terminals Emergency DC braking timeFailure detection signal generated FL relay deactivated Output phase failure detectionOutput phase failure detection mode selection Emergency stopping from the operation panelControl mode for small current Input phase failure detectionInput phase failure detection mode selection Over-torque trip Specified time Title Function Adjustment rangeDisabled Enabled Over-torque trip/alarm level ∼ 250 % Level flows for more thanOutput terminal function 12 OT Over-torque detection Detection signalNo trip Over-torque detection Pre-alarm signal No trip Over-torqueUndervoltage trip selection Undervoltage trip15.10 4-20mA dc calibration Meter biasProhibition of change of parameter settings Prohibition of change of parameter settingsExamples of setting Setting methodsUnit selection Resetting methodChanging the display unit to A/V/min-1 Free unit selectionDisplay in percentage terms Display in amperes/volts Changing the status monitor display format Changing the display format while power is onStandard monitor mode ⇒ Standard monitor display selection Standard monitor display selectionCommunication function Common serial Transmission specifications Using the RS232C/RS485Setting the communication functions Communication function parameters Common serial optionsNext data Use the terminal board to branch the cable Command by communicating independentlyExample of connection for RS485-communication Number, to the host computerOperation panel key setting Setting the operation frequencyApplied operation S1 UP S2 Down S3 CLR To switch to VIA/II setting, use the external PNL/TB Preset-speed settingSwitching between external contact UP/DOWN VIA input S1FCHGSetting by means of a remote input device Switching between analog setting and preset-speed settingSignal Voltage signal Operation is controlled in accordance with SettingSetting the operation mode Terminal board operationEration holding S1 terminal set to Case of three wire operation Set toEnable to run at HD on Operation, inverter stopS2 PNL/TB VIA VIB Operation from an external input deviceOFF LED Display of trip information Display of trip informationExample of call-up of trip information E6580757 Taking measures to satisfy the CE/UL directive How to cope with the CE directiveAbout the EMC directive Measures to satisfy the EMC directive Example of wiring Single-phase 200V classInverter satisfies the low-voltage directive About the low-voltage directiveMeasures to satisfy the low-voltage directive Plate. Refer to the .1 for earth cable sizesSelection of wiring materials and devices Peripheral devicesSelection of wiring devices Magnetic contactor in the primary circuit Installation of a magnetic contactorMagnetic contactor in the secondary circuit Installation of an overload relay Optional external devicesOr less Input AC reactor DC reactor Effect Reactor type Power factor Harmonics Suppression200V-3.7kW Improvement Other model Actor effective for external surge suppressionModel PWU001Z Extension panel Ward/reverse switch Model CBVR-7B1Parameter writer UP/DOWN key, Monitor key, and Enter key Model RKP001ZDevices Input AC re ActorDCL Devices External dimensions and connections Foot Mounted Noise filterDevices External dimensions and connections Braking Resistor Sion panel Devices External dimensions and connections ParameterWriter Exten CommunicaFour automatic functions Table of parameters and dataUser parameters Other Basic parametersExtended parameters Input/output parametersFrequency parameters VIB, VIA/II0213 VIB input point 400 Frequency Frequency Down Operation mode parameters Acceleration/deceleration time parameters Torque boost parametersProtection parameters Operation panel parameters Communication parametersDefault settings by inverter rating Table of input terminal functions 1/3Table of input terminal functions 2/3 ST+PNL/TBTable of input terminal functions 3/3 Table of output terminal functions 1/2Table of output terminal functions 2/2 POLOrder of precedence of combined functions Models and their standard specifications SpecificationsStandard specifications Specification Outside dimensions and mass Outside dimensions and massFig.A PlateBefore making a service call Trip information and remedies Trip causes/warnings and remediesProblem Possible causes Remedies Overvoltage during Problem Possible causes Remedies Small-current opera Process of initializa Values Restoring the inverter from a trip If the motor does not run while no trip message is displayed How to determine the causes of other problems How to cope with parameter setting-related problems Inspection and maintenance Regular inspectionCheck items Periodical inspectionCheck points Call the local sales agencyReplacement of expendable parts Making a call for servicing Standard replacement cycles of principal partsKeeping the inverter in storage Warranty Disposal of the inverter Toshiba Corporation