2 Product Overview2.1 IntroductionThis chapter provides an overview of the frequencyconverter’s primary assemblies and circuitry. It describesthe internal electrical and signal processing functions. Adescription of the internal control structure is alsoincluded.Also described are automated and optional frequencyconverter functions available for designing robustoperating systems with sophisticated control and statusreporting performance.2.1.1 Product Dedication to Water andWastewater ApplicationsThe VLT® AQUA Drive FC 202 is designed for water andwastewater applications. The integrated SmartStart wizardand the quick menu Water and Pumps guide the userthrough the commissioning process. The range of standardand optional features includes:• Cascade control• Dry-run detection• End of curve detection• Motor alternation• Deragging• Initial and final ramp• Check valve ramp• STO• Low-flow detection• Pre lube• Flow confirmation• Pipe fill mode• Sleep mode• Real-time clock• Password protection• Overload protection• Smart logic control• Minimum speed monitor• Free programmable texts for information,warnings and alerts2.1.2 Energy SavingsWhen comparing with alternative control systems andtechnologies, a frequency converter is the optimum energycontrol system for controlling fan and pump systems.By using a frequency converter to control the flow, around50% of energy savings can be achieved in typicalapplications, if the pump speed is reduced by 20%.Illustration 2.1 shows an example of the achievable energyreduction.130BD889.10605040302010Hs0 100 200 300 400(mwg)1350rpm1650rpm0102030(kW)405060200100 300 ( m3 /h)( m3 /h)4001350rpm1650rpmP shaft11 Energy savingIllustration 2.1 Example: Energy SavingProduct Overview Design GuideMG20N602 Danfoss A/S © 09/2014 All rights reserved. 152 2
