Danfoss VLT AutomationDrive FC 302 Operating Instructions Manual

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Danfoss VLT AutomationDrive FC 302 Operating Instructions Manual Manual pdf 8 page image

1.4.4 Block Diagram of the FrequencyConverterIllustration 1.4 is a block diagram of the internalcomponents of the frequency converter.Area Title Functions1 Mains input• 3-phase AC mains powersupply to the frequencyconverter.2 Rectifier• The rectifier bridge convertsthe AC input to DC current tosupply inverter power.3 DC bus • Intermediate DC-bus circuithandles the DC current.4 DC reactors• Filter the intermediate DCcircuit voltage.• Prove line transientprotection.• Reduce RMS current.• Raise the power factorreflected back to the line.• Reduce harmonics on the ACinput.5 Capacitor bank• Stores the DC power.• Provides ride-throughprotection for short powerlosses.6 Inverter• Converts the DC into acontrolled PWM AC waveformfor a controlled variableoutput to the motor.7 Output to motor • Regulated 3-phase outputpower to the motor.Area Title Functions8 Control circuitry• Input power, internalprocessing, output, and motorcurrent are monitored toprovide efficient operationand control.• User interface and externalcommands are monitored andperformed.• Status output and control canbe provided.Table 1.3 Legend to Illustration 1.4Illustration 1.4 Block Diagram of Frequency Converter1.4.5 Enclosure Types and Power RatingsFor enclosure types and power ratings of the frequencyconverters, refer to chapter 8.9 Power Ratings, Weight andDimensions.1.5 Approvals and CertificationsMore approvals and certifications are available. Contact thelocal Danfoss partner. Frequency converters of enclosuretype T7 (525–690 V) are UL certified for only 525–600 V.The frequency converter complies with UL 508C thermalmemory retention requirements. For more information,refer to the section Motor Thermal Protection in theproduct-specific design guide.1.6 DisposalDo not dispose of equipment containingelectrical components together withdomestic waste.Collect it separately in accordance withlocal and currently valid legislation.Introduction VLT® AutomationDrive FC 3026 Danfoss A/S © 06/2015 All rights reserved. MG34U40211