1 Introduction1.1 Purpose of the ManualThis operating guide provides information for safe instal-lation and commissioning of the VLT® drives.The operating guide is intended for use by qualifiedpersonnel. To use the unit safely and professionally, readand follow this operating guide. Pay particular attention tothe safety instructions and general warnings. Always keepthe operating guide with the drive.VLT® is a registered trademark.1.2 Additional ResourcesOther resources are available to understand advanceddrive functions and programming.• The programming guide provides greater detail onworking with parameters and many applicationexamples.• The design guide provides detailed informationabout capabilities and functionality to designmotor control systems.• Instructions provide information for operationwith optional equipment.Supplementary publications and manuals are availablefrom Danfoss. See drives.danfoss.com/knowledge-center/technical-documentation/ for listings.1.3 Manual and Software VersionThis manual is regularly reviewed and updated. Allsuggestions for improvement are welcome. Table 1.1 showsthe version of the manual and the corresponding softwareversion.Manual version Remarks Software versionMG21A5xx Replaces MG21A4xx 3.23Table 1.1 Manual and Software Version1.4 Approvals and CertificationsTable 1.2 Approvals and CertificationsMore approvals and certifications are available. Contact thelocal Danfoss office or partner. Drives of voltage 525–690 Vare UL certified for only 525–600 V.The drive complies with UL 61800-5-1 thermal memoryretention requirements. For more information, refer to thesection Motor Thermal Protection in the product-specificdesign guide.NOTICEOUTPUT FREQUENCY LIMITDue to export control regulations, the output frequencyof the drive is limited to 590 Hz. For demands exceeding590 Hz, contact Danfoss.1.4.1 Compliance with ADNFor compliance with the European Agreement concerningInternational Carriage of Dangerous Goods by InlandWaterways (ADN), refer to ADN-compliant Installation in thedesign guide.1.5 DisposalDo not dispose of equipment containingelectrical components together withdomestic waste.Collect it separately in accordance withlocal and currently valid legislation.Introduction VLT® AQUA Drive FC 2024 Danfoss A/S © 09/2018 All rights reserved. MG21A50211