Variable Frequency Drives For Sugar Mill
GK1000 AFE Energy Feedback AC DrivesGK1000 provides active front end (Active Front End,Website:, hereinafter referred to as AFE) function. Active front end unit not only provides adjustable and stable DC bus voltage, but also pure electric energy feedback to power grid. Introduction to GK1000 series AFE energy feedback AC DrivesGK1000 series AFE energy feedback AC Drives, consisting of AFE (Active Front End) and AC Drive, feature with four-quadrant operation. AFE unit could maintain constant DC bus voltage, improve input power factor, realize energy feedback efficiently, and achieve reactive compensation to power grid in applications; AC-drive unit could fulfill all varieties of industrial control demand on an AC Drive.Characteristics of GK1000 seriesCurrent distortion at power-supply side conforms to GB/17625.6-2003, with extremely low noise energy feedbackActive power factor correction. Realize input-side unit power factor runningExcellent dynamic responseNo requirement of power grid phase sequence, auto grid connection, four-quadrant operation, real-time bus energy feedback; advanced vector control algorithm ensures conversion with high efficiencyEven if momentary grid voltage fluctuation or abrupt load change occurs, constant DC voltage could be pledged due to auto bus voltage adjustment technology. Load capability could be assured accordinglyComparison between GK1000 Series and AC Drives Plus RBUsItemVFD+RBUGK1000 Series AFE Energy Feedback AC DrivesRunning modeDiode rectification and RBU feedback alternatedReal-time rectifying and feedback. Line current always sine-wave typeVoltage rippleAffectedSelf-compensatedEnergy feedbackYesYesTHDRectifying:>10%Feedback:<5%Rectifying: < 4% Feedback: < 4%Power factor<0.7=1.0Voltage thresholdRequiredNot required. Real-time feedbackControl on DC-side voltageNoYesRectificationDiode uncontrolledControl on DC-side voltageTypical applications of GK1000 seriesMining equipment: A lot of energy could be saved when using GK1000, as about half of working time of the equipment is in electric-regeneration status.Typical Applications: Long-distance Conveyors. WinchesCranes & Hoists: A lot of energy could be saved when using GK1000, as about half of working time of the equipment is in electric-regeneration status.Typical applications: Cranes. HoistsA lot of energy could be saved when using GK1000, as about half of working time of the equipment is in electric-regeneration status.Typical applications: Motor Test RigsLarge inertia load in high speed: A motor with a large inertia load is in electric-regeneration status when short-time deceleration or stop is performed. A lot of energy is saved when GK1000 is used in these applications instead of AC Drives plus brake resistors.Typical applications: Centrifugals. Large Industrial Washing MachinesMulti-motor system: Constant common DC bus voltage could be maintained in a multi-motor system while GK1000 are used. Regenerated energy is all fed back to power grid for energy saving purpose, and a number of accessories like brake units and brake resistors are saved accordingly.Typical Application: Paper Machines. Rolling MillsGK1000 series AFE energy feedback AC Drives circuit schematicCommon DC bus solution of GK1000 Series AFETechnical data of AFE part of GK1000 SeriesCategoryItemTechnical dataRemarksDC-side parametersDC-side voltage setting range450V-750V/Leakage current<50mA/Grid-side parameterspower rating30kW-630kW/Rated voltage3-phase 380-Vac/400Vac/415Vac/440Vac/460VacEffective value of line voltageRated current60A-1100A/Rated frequency50Hz/60HzRated value of line frequencyAllowable voltage range304V-506V/Frequency range±5%Normal in the rangeTHD<4%THD less than 2.5% at rated AmpsPower factor≥0.99Running at unit power factor0.95(Advanced)~110.95(Lagged)~1Consecutive adjustment at power ratingOverload capability150% 1min; 180% 10s; 200% 0.5sOnce per 10 minsTechnical Data of AC Drive part of GK1000 SeriesPower outputApplicable motorSee the table Model information of GK1000 SeriesRated currentSee the table Model information of GK1000 SeriesOutput voltage3-phase:0~rated input voltage, error less than ±3%Output frequency0.00Hz~600Hz, Resolution 0.01HzOverload capacity1min; 180% 10s; 200% 0.5s, once per 10 minsControl characteristicsControl patternV/F controlSpeed-sensorless control 1Speed-sensorless control 2Speed-sensor control, Position controlStarting torque0.5Hz 180%0.5Hz 180%0.25Hz 180%0Hz 200%Speed range1:1001:1001:2001:1000Speed accuracy0.50%±0.2%±0.2%±0.02%Speed ripple/±0.3%±0.3%±0.1%Torque controlNoYesYesYesTorque accuracy/7.50%±7.5%±5%Torque response/<10ms<10ms<5msPositioning accuracy///±1 pulseStart frequency0.00Hz~600HzAccel/Decel time0.00s-60000sCarrier frequency0.7kHz-16kHzBasic functionsFrequency command modesDigital setting + keypad ∧/∨; Digital setting + terminal UP/DOWNCommunication setting; Analog setting (AI1/AI2/AI3); Terminal pulse settingStart methodsStart from starting frequency; DC injection braking at started; Flying startStop methodsRamp to stop; coast to stop; DC injection at ramp stopInput terminals7 digital inputs, one of which can be used for high-speed pulse input. Compatible with active open collectors NPN, PNP and dry contact input. 3 analog inputs, one of which supports voltage input only, and the other two are voltage/current programmable.Output terminalsOne high-speed pulse output terminal, 0~50kHz square signal; and two analog outputs can output command frequency, output frequency and so forthOne digital output terminalTwo relay output terminalsEncode input terminalCompatible with 5V/12V power supplyCompatible with OC, push-pull and differential signal inputs, etc.Characteristic functionsParameter copy, parameter backup, common DC bus, free switchover between two motors’ parameters, flexible parameter displayed & hidden, various master & auxiliary command and switchover, reliable speed search started, a variety of Accel/Decel curves programmable, automatic correction of analog, contracting brake control, 16-step speed control programmable (2 steps support flexible frequency command), wobble frequency control, fixed length control, count function, three faults recorded, over excitation brake, over voltage stall protection programmable, under voltage stall protection programmable, restart upon power loss, skip frequency, frequency binding, four kinds of Accel/Decel time, motor thermal protection, flexible fan control, process PID control, simple PLC, multi-functional key programmable, droop control, asynchronous and synchronous motor parameter identification, field-weakening control, high-precision torque control, V/f separated control, torque control at sensor-less vector control, torque control at close-loop vector control, two encoder signal inputs (support incremental, UVW hybrid and resolver, etc.), flexible deceleration ratio control, zero servo, motor spindle orientation, simple feed forward control, pulse train position controlEnvironmentFieldIndoors, no direct sunlight, free from dust, corrosive gases, flammable gases, oil mist, water vapor, water drop and salt, etc.Altitude0~2000m: de-rated 1% for every 100m when above 100 metersDe-rate 1% for every 100m when the altitude is above 1000 metersTemperature-10℃~50℃, 50℃to 60℃: rated output current de-rates 1% for every 1℃above 50℃Humidity5~95%, no condensationVibrationLess than 5.9m/s2 (0.6g)Storage temperature-40℃~+70℃OthersEfficiencyAt rated Amps, 55kW and below: ≥ 95%; 75kW and above: ≥98%Protection gradeIP20Cooling methodForced air coolingModel Information of GK1000 SeriesModelPower Rating (KW)Rated Input Current (A)Rated Output Current (A)GK1000-4T30304660GK1000-4T37375675GK1000-4T45456891GK1000-4T555584112GK1000-4T7575114150GK1000-4T9090137176GK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4TGK1000-4T
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