1.1 Introduction

1.1.1 Purpose of the Manual This quick guide provides information for safe installation and commissioning of the VLT® Micro Drive FC 51 frequency converter.

The quick guide is intended for use by quali€ed personnel. To use the frequency converter safely and professionally, read and follow the operating instructions. Pay particular attention to the safety instructions and general warnings. Always keep this quick guide with the frequency converter.

VLT® is a registered trademark.

1.1.2 Additional Resources Additional resources are available to understand advanced frequency converter functions and programming:

• The VLT® Micro Drive FC 51 Programming Guide provides greater detail on working with parameters and many application examples.

• The VLT® Micro Drive FC 51 Design Guide provides detailed information about capabilities and functionality to design motor control systems.

• Instructions for operation with optional equipment and replacement of components. Supplementary publications and manuals are available at: drives.danfoss.com/downloads/portal/#/ 089 The frequency converter complies with UL 508C thermal memory retention requirements. For more information, refer to the section Motor Thermal Protection in the product-speci€c design guide.

1.1.3 IT Mains NOTICE IT MAINS Installation on isolated mains source, that is IT mains. Maximum supply voltage allowed when connected to mains: 440 V. As an option, Danfoss offers recommended line €lters for improved harmonics performance. See Table 1.11.

1.1.4 Avoid Unintended Start While the frequency converter is connected to mains, the motor can be started/stopped using digital commands, bus commands, references, or via the LCP (local control panel). To avoid unintended start:

• Disconnect the frequency converter from mains for personal safety considerations.

• Always press [Off/Reset] before changing parameters.