Danfoss VLT Drive Range: Next-Generation FC280 Frequency Converter

Danfoss VLT Midi Drive FC280 — a Next-Generation Drive for Industrial Automation

Danfoss, a company with over 50 years of experience in manufacturing frequency converters, has refreshed its drive portfolio with the VLT Midi Drive FC280 series. This model replaces the legendary VLT 2800 — a drive that remained one of the most popular solutions for AC motor control in Europe for two decades. The FC280 maintains compatibility with its predecessor in terms of dimensions and wiring, while offering a fundamentally new level of functionality, safety, and automation integration.

For engineers and integrators selecting a frequency converter for a specific application, understanding the differences between series within the same manufacturer is essential. That is why we have prepared not just a description of the FC280, but a comprehensive comparison with other models in the Danfoss range, along with practical selection guidelines.

Danfoss Series Comparison: FC280 vs FC51, FC302 and VACON NXP

Before focusing on the FC280, let us look at the overall picture of the Danfoss drive portfolio. Each series covers its own range of power ratings and applications:

As the table shows, the FC280 occupies a middle ground between the budget-friendly FC51 and the high-end FC302. At the same time, it includes more standard built-in features than the FC51, which reduces the overall project cost — there is no need to purchase external communication modules, brake choppers, or EMC filters.

Key Advantages of the Danfoss VLT Midi Drive FC280

Functional Safety STO Without External Relays

One of the most important innovations in the FC280 is the built-in Safe Torque Off (STO) function. This feature complies with IEC 61800-5-2 and provides safety level PL d per ISO 13849-1 and SIL 2 per IEC 62061. In practice, this means that stopping the motor in an emergency does not require an external safety relay — the dual-channel STO is integrated directly into the drive.

For machine builders designing equipment in accordance with the EU Machinery Directive (2006/42/EC), this is a significant advantage: fewer components in the cabinet, simpler safety circuit, fewer potential failure points. This is particularly relevant for industrial applications where personnel safety requirements are critical.

Built-in Modbus RTU and Extended Communication Protocols

The FC280 ships with a built-in Modbus RTU interface as standard. This means that connecting the drive to an automation system requires no additional modules — just an RS-485 cable. For facilities that use SCADA systems or PLCs with Modbus support, this solution saves both equipment costs and commissioning time.

In addition to Modbus RTU, the FC280 supports optional industrial network modules:

• PROFINET — for integration with Siemens and other PROFINET controllers
• EtherNet/IP — for Allen-Bradley (Rockwell Automation) based systems
• PROFIBUS DP — the classic protocol for distributed systems
• CANopen — for mobile and specialized equipment

This flexibility in protocol selection allows the FC280 to be integrated into virtually any existing automation system. This makes it an excellent choice for equipment upgrades where an old drive needs to be replaced without rebuilding the entire network. Learn more about how frequency converters work in our dedicated article.

Conformal PCB Coating for Harsh Environments

The FC280 printed circuit boards feature conformal coating rated class 3C3 per IEC 60721-3-3. This means the drive can withstand exposure to moisture, dust, aggressive gases, and chemical vapours — conditions typical of food processing, chemical manufacturing, and agriculture. Unlike standard drives that may require an additional air-conditioned enclosure in such environments, the FC280 can be installed in a standard cabinet without extra protection.

Built-in Brake Chopper and DC Choke

Across its entire power range (3-phase models), the FC280 is equipped with a built-in brake chopper. This is particularly important for applications involving frequent starts and stops — conveyors, lifts, packaging machines, and centrifuges. Without a built-in chopper, an external braking module would be required, adding both cost and cabinet space.

The FC280 also features a built-in DC choke that reduces harmonic distortion in the supply network (THDi) and extends the service life of DC bus capacitors. For facilities where power quality is critical (for example, near sensitive measuring equipment), this is a substantial benefit.

Compatibility with VLT 2800 and Easy Retrofit

Danfoss specifically designed the FC280 for maximum compatibility with the VLT 2800:

• Identical footprint — the FC280 fits into the same panel cutout as the VLT 2800
• Matching terminal layout — power and control terminals are in the same positions
• Compatible cable lengths — no need to reroute cables during replacement
• MyDrive Suite software — enables parameter transfer from the old drive via memory card or USB

As a result, replacing a VLT 2800 with an FC280 takes minimal time. According to Danfoss, a typical single-drive retrofit is completed in 15-30 minutes, including disconnecting the old drive, mounting the new one, and transferring parameters. For facilities with dozens or hundreds of VLT 2800 drives, this means planned modernization without extended downtime.

Permanent Magnet Motor Support

Unlike its predecessor VLT 2800 and the entry-level FC51, the FC280 supports permanent magnet synchronous motors (PM motors). This opens opportunities for significant improvements in energy efficiency:

• PM motors deliver 3-5% higher efficiency than induction motors at partial load
• Smaller physical dimensions for equivalent power output
• Superior dynamic response — faster reaction to load changes
• Energy savings of 15-30% in pump and fan applications

If you are considering how to select a frequency converter for a new project with a PM motor, the FC280 is an optimal choice in the range up to 22 kW — it provides full vector control of PM motors without the need to step up to the more expensive FC302.

Application Areas for the VLT Midi Drive FC280

The FC280 power range from 0.37 to 22 kW covers the majority of tasks in machine building and industrial automation. Here are the typical applications where this drive performs best:

Food and Processing Industry

The 3C3 conformal PCB coating, built-in EMC filter, and compact dimensions make the FC280 ideal for installation in production halls with elevated humidity and chemically active environments. Typical applications include conveyor belts, mixers, dosing systems, and packaging equipment.

Conveyor Systems and Logistics

The built-in brake chopper and STO function allow the FC280 to be used on conveyor lines requiring rapid braking and emergency stops. Industrial network support simplifies the integration of dozens of drives into a unified control system.

Pump and Fan Systems

For HVAC and water supply systems, the FC280 offers energy-saving modes with quadratic U/f characteristics. PM motor support further increases savings. If you need a solution for motor starting control, also consider soft starters in our catalogue.

Compressor Equipment

Smooth startup without inrush currents, precise pressure maintenance via a PID controller, and overload protection make the FC280 a reliable solution for screw and reciprocating compressors.

The Danfoss Drive Portfolio: a Complete Range of Solutions

The FC280 is part of the broader Danfoss drive ecosystem, which spans power ratings from 0.18 kW to 5.3 MW:

• VLT Micro Drive FC51 — a compact converter for simple applications with minimal feature requirements. Ideal for small pumps, fans, and single-motor installations.
• VLT Midi Drive FC280 — a balanced solution with an extended set of standard features. Optimal for machine builders and OEM manufacturers.
• VLT AutomationDrive FC301/FC302 — a high-performance drive for complex automation tasks. The FC302 provides full vector control, support for multiple motor types, and power ratings up to 75 kW (and higher in special configurations).
• VLT AQUA Drive FC202 — a specialized drive for water supply and wastewater applications with built-in pump protection functions.
• VACON NXP — a premium drive for heavy industry (mining, marine, oil and gas) rated up to 2 MW.
• VACON 20 — a general-purpose drive from the VACON series for basic applications.

To compare different converter types and select the optimal solution for your application, we recommend browsing our frequency converter catalogue, featuring models from Danfoss and other manufacturers.

Software and Commissioning

Danfoss offers a unified software platform called MyDrive Suite for working with the FC280 and other drives in the VLT range. Key capabilities include:

• MyDrive Harmonics — network harmonic distortion calculations
• MyDrive Insight — cloud-based drive condition monitoring
• Quick commissioning wizard — step-by-step setup via the LCP panel or USB
• Parameter cloning via microSD card — convenient for serial equipment production

A front-panel USB port allows connection of a laptop for parameterization without removing the drive cover. This speeds up commissioning and simplifies diagnostics during operation.

VLT Midi Drive FC280 Technical Specifications (Summary)

Practical Guidelines for Choosing a Danfoss Series

To make the right choice, follow this simple rule:

1. Up to 2.2 kW, simple application, limited budget — VLT Micro Drive FC51. Minimum features, maximum compactness. Suitable for single-phase 220 V networks.
2. 0.37-22 kW, STO safety required, built-in protocols, serial production — VLT Midi Drive FC280. Best price-to-feature ratio for OEMs and integrators.
3. Above 22 kW, complex automation, precision positioning — VLT AutomationDrive FC302. Maximum flexibility and performance.
4. Water supply and HVAC — VLT AQUA Drive FC202. Specialized algorithms for pumps and fans.
5. Heavy industry, 100 kW+ — VACON NXP. Premium-class solution for critical applications.

Regardless of the series chosen, all Danfoss drives operate within the unified MyDrive Suite software ecosystem, which simplifies staff training and standardizes maintenance across the facility.