Danfoss VLT AutomationDrive FC 301 Operating Instructions Manual

Also see for VLT AutomationDrive FC 301: Programming guide Installation guide Operating guide Installation guide Design guide

Contents

Danfoss VLT AutomationDrive FC 301 Operating Instructions Manual Manual pdf 9 page image

1.4.3 Block Diagram of the FrequencyConverterIllustration 1.3 is a block diagram of the internalcomponents of the frequency converter. See Table 1.2 fortheir functions.Area Title Functions1 Mains input 3-phase AC mains supply to thefrequency converter.2 RectifierThe rectifier bridge converts theAC input to DC current to supplyinverter power.3 DC bus Intermediate DC-bus circuithandles the DC current.4 DC reactors• Filter the intermediate DCcircuit voltage.• Provide mains 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 InverterThe inverter converts the DC intoa controlled PWM AC waveformfor a controlled variable output tothe motor.7 Output to motor Regulated 3-phase output powerto 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.Illustration 1.3 Frequency Converter Block Diagram1.4.4 Enclosure Sizes and Power RatingsFor enclosure sizes 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 enclosuresize 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.For compliance with the European Agreement concerningInternational Carriage of Dangerous Goods by InlandWaterways (ADN), refer to ADN-compliant Installation 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 Operating InstructionsMG33AQ02 Danfoss A/S © 07/2015 All rights reserved. 71 1