1 Introduction1.1 Purpose of the ManualThese operating instructions provide information for safeinstallation and commissioning of the frequency converter.The operating instructions are intended for use byqualified personnel.Read and follow the operating instructions in order to usethe frequency converter safely and professionally, and payparticular attention to the safety instructions and generalwarnings. Keep these operating instructions available withthe frequency converter at all times.1.2 Additional ResourcesOther resources are available to understand advancedfrequency converter functions and programming.• The VLT® Programming Guide provides greaterdetail on working with parameters and manyapplication examples.• The VLT® Design Guide provides detailedinformation about capabilities and functionality todesign motor control systems.• Instructions for operation with optionalequipment.Supplementary publications and manuals are availablefrom Danfoss. See www.danfoss.com/BusinessAreas/DrivesSo-lutions/Documentations/VLT+Technical+Documentation.htmfor listings.Disclosure, duplication and sale of this document, as wellas communication of its content, are prohibited unlessexplicitly permitted. Infringement of this prohibition incursliability for damages. All rights reserved with regard topatents, utility patents and registered designs. VLT® is aregistered trademark.1.3 Document and Software VersionThis manual is regularly reviewed and updated. Allsuggestions for improvement are welcome. Table 1.1 showsthe document version and the corresponding softwareversion.Edition Remarks Software versionMG11AJxx Replaces MG11AIxx 3.92Table 1.1 Document and Software Version1.4 Intended UseThe frequency converter is an electronic motor controllerthat• regulates motor speed in response to systemfeedback or to remote commands from externalcontrollers. A power drive system consists of thefrequency converter, the motor and equipmentdriven by the motor.• monitors aspects of system and motor status.• can be used for motor protection.Depending on configuration, the frequency converter canbe used in standalone applications or form part of a largerappliance or installation.The frequency converter is intended for use in residential,industrial and commercial environments in accordancewith local laws and standards. Do not use the frequencyconverter in applications that do not comply with specifieddesignated operating conditions and environments.NOTICEIn a residential environment this product may causeradio interference, in which case supplementarymitigation measures may be required.Introduction VLT® HVAC Drive Operating InstructionsMG11AJ02 - Rev. 2013-07-31 31 1