Danfoss VLT Drive

Introduction

This document provides guidance for configuring a G3 operator interface terminal to communicate with a Danfoss VLT Drive.

The communications protocol allows access to numeric parameters only, enabling data exchange between the interface and the drive. [g3-danfossvlt | Word]

Accessing Data

• All parameters use a “P” prefix in the addressing scheme
  • Example: P600 = Drive operating hours [g3-danfossvlt | Word]
• Only numeric registers are supported
• Parameters containing textual data cannot be read or written [g3-danfossvlt | Word]

Control Word and Bus Reference Access

Crimson provides a mechanism to send Control Word and Bus Reference values. [g3-danfossvlt | Word]

Configuration Guidelines

• Set Control Word and Bus Reference tags to Write Only
• Set Bus Reference to the desired value first
• When setting multiple Control Word bits:
  • Use an internal tag for bit manipulation
• Write the Control Word (this triggers transmission of both values) [g3-danfossvlt | Word]

Operational Considerations

• The driver uses a pass-through approach
• No validation is performed on written values
• Proper configuration requires:
  • Knowledge of Danfoss drive operation
  • Understanding of system behavior [g3-danfossvlt | Word]

Communications

Communication with the Danfoss VLT Drive is via RS-485. [g3-danfossvlt | Word]

Default Serial Settings

• Baud Rate: 9600
• Data Bits: 8
• Parity: Even
• Stop Bits: 1 [g3-danfossvlt | Word]

Cable Information

Summary

This driver is designed for simple numerical parameter access to Danfoss VLT drives. Key points:

• Only numeric parameters (Pxxx) are supported
• Control Word write triggers command execution
• Requires careful user validation of values
• Uses standard RS-485 communication