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Toshiba VF-FS1 instruction manual Low loads and low inertia loads, Occurrence of instability

Models: VF-FS1

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E6581381

Low loads and low inertia loads

		The motor may demonstrate instability such as abnormal vibrations or overcurrent trips at light loads of
		50 % 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 with 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

To deal with the above lower the settings of inverter carrier frequency.

⋅ Combined with couplings between load devices and motors with high backlash

When using the inverter in the above combination, use the S-pattern acceleration/deceleration function, or when vector control is selected, adjust the speed control response/stability factor or switch to V/F control mode.

⋅ Combined with loads that have sharp fluctuations in rotation such as piston movements In this case, please do not use this inverter.

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 devices, both electrical and mechanical. Select the brake that is best for the system.

Load that produces regenerative torque

Do not use the inverter in combination with a load, such as an air conditioner, that produces regenerative torque. Or the overvoltage or overcurrent protection circuit of the inverter may be activated, causing the inverter to trip. If overvoltage tripping occurs during deceleration, lengthen the deceleration time.

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Toshiba VF-FS1 Low loads and low inertia loads, Occurrence of instability, Braking a motor when cutting off power supply

Contents

Industrial Inverter Page 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. Introduction Contents  E6581381 Iii Read first Check product purchaseContents of the product Names and functions Outside viewBottom Power circuit and control circuit terminal boards Power circuit terminal boardVFFS1-2004 ∼ 2037PM VFFS1-4004 ∼ 4055PL E6581381 E6581381 Grounding capacitor disconnecting switch and taps Control circuit terminal board AWGHow to open the front terminal board cover-18.5kW or less How to open the front terminal board cover-22kW or More Motors Occurrence of instability Braking a motor when cutting off power supplyLow loads and low inertia loads Load that produces regenerative torqueMeasures to protect motors against surge voltages InvertersBraking motor Protecting inverters from overcurrentOperating at other than rated voltage Power factor correction capacitorIf power supply distortion is not negligible MCCB1Remedies What to do about the leak currentEffects of leak current across ground ElcbAffects of leakage current across lines Installation Installation environment5cm How to install Standard installation Side-by-side installationOperating motor Calorific Values w Installing more than one unit in a cabinet Page Connection Standard connections Control and main power supplyWiring Preventing radio noiseStandard connection diagram Standard connection diagram Power circuit terminals Description of terminalsControl circuit terminals Power circuitControl circuit terminals VIA VIBFLC FLAFLB PLC Logic switching Operations Hoqf Simplified Operation of the VF-FS1Eoqf Start and stop using the operation panel keys EOQF= How to start and stopExample of a Eoqf setting procedure Coast stopExample of operating a run from the panel How to set the frequencyExample of a Hoqf setting procedure HOQFSetting the frequency using the operation panel HOQF= or Frequency settingHow to operate the VF-FS1 Mccb Page Basic VF-FS1 operations Setting monitor mode Mode for setting inverter parametersMode for monitoring all inverter status Flow of status monitor mode How to set parameters Basic parameters Extended parameters User parametersHow to set the basic parameters Changes the parameter setting Saves the changed valueHow to set extended parameters How to search and reprogram parameters Search and resetting of changed parameters I4WExample of parameter setting ITWHTH Setting a parameter, using the wizard function CWHCEE How to use the wizard function How Parameters of Quick setting wizardJgcf How to use the history functionCWJ Parameters that cannot be changed while running CWKpkv Returning all parameters to standard default settingHow to save/load the user setting parameters Page Automatic acceleration/deceleration Setting acceleration/deceleration timeBasic parameters CWK Manually setting acceleration/deceleration timeMethods of setting automatic acceleration/deceleration Function Adjustment range Default setting EOF Specifying an operation mode, using parametersUP/DOWN UP/DOWN HOFRES PLC VIA VIB OFF Selection of operation mode Setting mode Switching of commands and referencesCommand mode selection Frequency setting mode selection Preset-speed operationHOUN= Meter setting and adjustmentHoun Meter selection HO Meter adjustment HounVF-FS1 ResolutionAdjustment scale with parameter HO Meter adjustment Adjusting the meter in inverter stop state HOUN=Programmed value Standard default settingVR Default setting E6581381 Forward/reverse run selection Operation panel operation HT Forward/reverse run selection Operation panel operationHJ Maximum frequency Maximum frequencyUpper limit and lower limit frequencies WN Upper limit frequency NN Lower limit frequencyBase frequency XN Base frequency XNX Base frequency voltageSelecting control mode RV V/F control mode selectionConstant torque characteristics Setting for fans and pumpsIncreasing starting torque Motor constant must be setEnergy-saving Precautions on vector control+ Motor constant must be set Operating a permanent magnet motorE6581381 Valid, Invalid XD Torque boost Setting the electronic thermalManual torque boost increasing torque boost at low speeds QNO Motor electronic thermal protection level Setting value Overload protection Overload stall Inverter over load characteristics Motor 150%-overload time limit HThermal memory selection H Preset-speed operation speeds in 7 stepsUT UT Preset-speed operation frequencies UT UTUT UTBelow is an example of 7-step speed operation Extended parameters Low-speed signal Low-speed signal output frequency Input/output parametersOutput of designated frequency reach signal Speed reach detection bandOutput of set frequency speed reach signal Designated frequency VIA terminal function selection Input signal selectionChanging the functions of VIA terminal Modifying input terminal functions Terminal function selectionKeeping an input terminal function always active on Setting of contact input terminal function Connection method 1 A-contact input Connection with transistor outputExamples of application Modifying output terminal functionsSink Negative logic / Source Positive logic input RY RC Assigning two functions to an output terminalAssigning one function to an output terminal RY-RC Hdry Holding the output of signals in on statusInput terminal function Comparing the frequency command values FLA-FLB-FLCSwitching motor characteristics via terminal input Basic parametersAD2 VF2 MOT2 OCS2 OFF Setting of switching terminalsFrequency priority selection External switching Input terminal function 38 Fchg enabled Automatic switching by frequency commandSetting frequency command characteristics 10Vdc voltage input adjustment VIA, VIB VIA, VIB terminalsSetting of frequency with the input from an external contact Sample sequence diagram 1 Adjustment with continuous signals Adjustment with pulse signals Parameter-setting exampleMinimum unit of frequency adjustment About the setting of the initial up/down frequencyFrequency adjustment range About the change of the initial up/down frequencyFine adjustment of frequency setting signal Operation frequency 2 Run/stop control with frequency setting signals Starting frequency setting Starting frequencyDC braking DC brakingOFF Jump frequency jumping resonant frequencies Bumpless operation Bumpless operation selectionPWM carrier frequency 0.75kW 15kW E6581381 Auto-restart control selection Trip-less intensificationAuto-restart Restart of coasting motor Restarting motor during coasting Motor speed search function Motor speed search at startingInstantaneous power failure coast stop selection Instantaneous power failure coast stop selectionRetry function Retry selection Selecting the number of timesE6581381 Avoiding overvoltage tripping Output voltage adjustment/Supply voltage correction Canceling the operation command Reverse-run prohibitionDroop control  Droop gain  Droop insensitive torque bandE6581381 Conducting PID control External connectionTypes of PID control interfaces Setting PID controlAdjusting the PID control gain level P-gain adjustment parameter I-gain adjustment parameterSetting the time elapsed before PID control starts D-gain adjustment parameterAdjusting analog command voltages Setting motor constants Setting motor constantsSet the auto-tuning parameter H to Auto-tuning enabled E6581381 Setting motor constants 2 Details E6581381 Acceleration/deceleration time Selecting an acceleration/deceleration patternSwitching acceleration/deceleration time 1 E6581381 Setting motor electronic thermal protection Protection functionsSetting current stall Stall prevention level Inverter trip retention selection Inverter trip retention External trip stop via terminals Emergency stop Emergency stop Emergency DC braking time Emergency stopping from the operation panelOutput phase failure detection Output phase failure detection mode selection Input phase failure detection mode selection Input phase failure detectionControl mode for small current Detection of output short-circuit Detection of output short-circuit during start-upOver-torque trip OFF On OFF Over-voltage stall protection level Cumulative operation time alarm setting Cumulative operation time alarm setting Over-voltage stall protection level Undervoltage trip/alarm selection Undervoltage trip Trip at VIA low level input mode Trip at VIA low level input modeParts replacement alarms Motor PTC thermal protection Evasion from Overvoltage and Imput phase failure Forced fire-speed control function NNWNCalibration of analog outputs Adjustment parametersExample of setting Operation panel parameter Prohibition of key operations and parameter settingsResetting method Changing the unit to a Current / voltage unit An example of setting when HJ is 80 and H is Free pressing a panel key once Free panel display When H is not 0.00, and H is not 0 disabledChanging the steps in which the value displayed changes Standard monitor display selection Changing the item displayed by defaultChanging the display format while power is on Display of the head of the parameters Integral output powerSelection of operation panel stop pattern Selection of operation panel stop patternTitle Communication function Common serial Setting of common functionError by disconnection Communication rate Communication function parameters Common serial options E6581381 Transmission specifications Using the RS485Setting the communication functions Example of connection for RS485-communicationWiring Parameters for options Permanent magnetic motorsPage HOQF Setting the operation frequencyApplied operation HOQFHoqf P24Hoqf PLC VIA SS3 VIB RES Setting the operation mode RES SC/LCRES SC/LC PLC VIA VIB Status monitor under normal conditions Status monitor modeMonitoring the operation status LEDKK VIA RESPgtt ⇔ Display of detailed information on a past trip Display of trip information Display of trip informationTrip code display Display of trip information at the occurrence of a trip Example of call-up of trip informationInput terminal KK FE06 OFF Cause of the trip is displayed E6581381 Page About the EMC directive How to cope with the CE directiveMeasures to satisfy the standards Measures to satisfy the EMC directive Three-phase 400V class Example of wiring About the low-voltage directiveMeasures to satisfy the low-voltage directive Compliance with InstallationCompliance with UL Standard and CSA Standard Compliance with ConnectionAIC a AIC, Fuse and Wire sizesMotor thermal protection Selection of wiring materials and devices Peripheral devicesSelection of wiring devices Input current aInstallation of a magnetic contactor Magnetic contactor in the primary circuitInstallation of an overload relay Magnetic contactor in the secondary circuitOptional external devices Page 11.2 Basic parameters Table of parameters and data11.1 User parameters Houn UT Extended parameters Input/output parametersFrequency parameters Operation mode parameters NNWN Torque boost parameters Acceleration/deceleration time parameters Protection parameters Output parameters Operation panel parametersCommunication parameters Default settings by inverter rating PM motor parametersTable of input terminal functions AD2OHN Table of output terminal functions LLNUCN Pidfn Order of precedence of combined functions Standard specifications SpecificationsModels and their standard specifications Common specification Display Outside dimensions and mass Outside dimensions and massOutline drawing Fig.AFig.E Before making a service call Trip information and remedies Trip causes/warnings and remediesQR GTT QHH 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 problemsPage Inspection and maintenance Regular inspectionCheck items Periodical inspectionCheck points Replacement of expendable parts Standard replacement cycles of principal parts Making a call for servicing Keeping the inverter in storagePage Warranty Disposal of the inverter Page 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