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VLT® AutomationDrive EZ FC 321

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Supply voltages and power range

  • 3 x 200 – 240 V..................... 0.33 HP – 100 HP
  • 3 x 380 – 480/500 V.............. 0.5 HP – 200 HP
  • 3 x 525 – 600 V.................... 1 HP – 100 HP
  • 3 x 525 – 690 V.................... 125 HP – 200 HP

The EZ Everything Drive

For basic drive applications, you don't want to sift through a laundry list of features to customize your drive and wait for delivery; you want an AC Drive with a low number of variants that's easy to stock, ships quickly when needed, and is simple to start up with plug-and-play convenience. We heard you, and that's why we are proud to introduce the VLT® AutomationDrive EZ FC 321. Now available with condition-based monitoring (CBM), this drive offers real-time insights to help predict equipment failures before they happen. For variable speed control of all asynchronous and permanent magnet motors, on any industrial machine or production line, this VFD is packed with standard features right off the shelf with no special configuration or customization required. Save energy, improve flexibility, and optimize processes with this intelligent yet simple variable frequency drive designed for easy stocking and fast turnaround—because every motor deserves the best AC Drive.

Need support? Try MyDrive® Assistant now! Read our Fact Sheet!

Features and benefits

  • Flexible and expandable: With a flexible modular design, the AutomationDrive EZ FC 321 is packed with standard features which can be expanded with plug-and-play options with additional features and fieldbuses. Safe Torque-Off is a standard safety feature that can be applied through hardwired safety.

  • Printed circuit board protection: Drives up to 100 HP conforms to class 3C2 (IEC 60721-3-3) as standard. Drives above 100 HP come standard with 3C3.

  • Robust and reliable: VLT® AutomationDrive EZ FC 321 is a proven performer in all industrial environments and grid voltages, including 690V. Enclosures are available up to NEMA 4X (depending on model), and integrated DC chokes and RFI filters in all models protect installations by minimizing harmonic distortion and electromagnetic interferences. All drives are tested at full-load before leaving the factory.

  • Easy set up and commissioning: The VLT® AutomationDrive EZ FC 321 is easy to set up and operate via the user-friendly graphical control panel, requires minimal maintenance, and delivers a market leading control solution which provides a fast return on investment with a highly competitive cost of ownership.

  • Smart Start wizard: Includes groups for several of the most common applications, including conveyors, pumps and fans, and setup with mechanical brake. With the settings to run applications already in place, you can get your machine up and running faster, increasing your productivity.

Avoid unplanned downtime with condition based monitoring

Unplanned downtime for any industrial machine or production line, can be catastrophic for essential infrastructure and those who depend on it today. Danfoss technologies empower frontline operators - both on site and remote - to predict unforeseen early failures thereby better planning for maintenance and maximizing uptime. Explore how intelligent VLT® drives solve potentially critical problems in your applications.

Learn more about condition-based monitoring
Avoid unplanned downtime with condition based monitoring

Support

Documents

Documents
Type Name Language Valid for Updated Download File type
Brochure 9 Tips towards energy efficiency English Multiple 09 Jan, 2023 79.2 MB .pdf
Brochure 9 Tips towards energy efficiency - English US English United States 14 Jun, 2023 77.8 MB .pdf
White paper Impact of IEC 61800-5-1:2022 on variable frequency drives (VFD) English Multiple 20 Mar, 2026 4.6 MB .pdf
Case story Kolomela Mine SA English Multiple 16 Mar, 2023 4.2 MB .pdf
Case story Kolomela Mine SA - US English English United States 16 Mar, 2023 4.1 MB .pdf
Case story Markus Kaffee English Multiple 19 Jul, 2023 1.0 MB .pdf
Fact sheet Panel through mount accessory English Multiple 08 Aug, 2023 1.1 MB .pdf
Fact sheet Reduce energy costs with intelligent heat management English United States 19 Jul, 2023 1.2 MB .pdf
Operating guide STO, VLT® AutomationDrive EZ FC 321 OG English Multiple 11 Dec, 2022 397.4 KB .pdf
Brochure VLT® Functional Safety English Multiple 11 Nov, 2021 2.7 MB .pdf
Fact sheet VLT® PTC Thermistor Card MCB 112 English Multiple 09 Aug, 2023 693.8 KB .pdf
Fact sheet VLT® Safety Option MCB 150/151 and VLT® Sensorless Safety MCB 159 | Operate safely and reduce system cost English Multiple 26 Apr, 2023 957.9 KB .pdf
Fact sheet VLT® Safety Option MCB 152 English Multiple 08 Aug, 2023 817.2 KB .pdf

Drawings

Your online documentation advantage Danfoss offers parts in IEC & NFPA standards on the Data Portal for the FC 321. NFPA macros dedicated for North America are available on the EPLAN Data Portal, this gives you online access to drawings and documentation which can be dragged and dropped into a project.

Frame Ratings by HP

Contact factory for drives larger than 200HP

Additional mechanical drawings including drawings for Drives with options, electrical drawings and E-Plan files are located below this table under the heading 3D models and drawings.

Frame

Enclosure

HP Range

Base drive dimensions (Inches)

Mechanical drawing #

Chassis

NEMA 4X / NEMA 12 D-Frame

230V

460V

600V

Height

Width

Depth

T1

A2

 O   0.5-3 0.5-5 - 14.7 3.5 8.1 MCAD A2

A3

 O   4-5 7.5-10 1-10 5.1 MCAD A3

A5

   O 0.5-5 0.5-10 1-10 16.5 9.5 7.9 MCAD A5

B1

   O 7.5 - 10 15-20 19 9.5 10.3 MCAD B1

B2

   O 15 30 25-30 26.1 MCAD B2

B3

 O   7.5-10 15-20 15.7 6.5 9.8 MCAD B3

B4

 O   15-20 25-40 20.4 9.1 9.5 MCAD B4

C1

   O 25-30 40-60 27 12.1 12.2 MCAD C1

C2

   O 40-50 75-100 30.7 14.6 13.1  MCAD C2

C3

 O   25-30 50-60 21.7 12.1 13.2 MCAD C3

C4

 O   40-50 75-100 26 14.6 MCAD C4

D1h

   O 60-75 150-200 125-200 33.2 12.8 14.9 MCAD D1h

D2h

   O 100 125-200 43.6 16.5 MCAD D2h

D3h

 O   60-75 125-200 35.8 9.8 14.8 MCAD D3h

D4h

 O   100 - 44.2 13.8 14.7 MCAD D4h

To sort drawings in the 3D models and drawings table below, click on the filter icon to the right of the column title "Type" (shown circled at right):

3D models and drawings

Type Name Language Updated Download File type

Software

Software
Type Software Characteristic Name Version Language Released Status Download File type
System software Library VLT® AOI for Rockwell Studio 5000 1.00 English 16 Dec, 2019 Released 7.2 MB .zip
Software tools VLT® AutomationDrive EZ FC 321 Simulator 08.83 English 01 Jul, 2021 Released 3.4 MB .zip
System software VLT® FC 321 Support File 08.83 English 09 May, 2021 Released 3.9 MB .zip
Software tools VLT® Motion Control Tool MCT10 6.20 English 09 Dec, 2025 Released 1.3 GB .zip
Software tools VLT® Motion Control Tool MCT10 5.50 English 13 Jul, 2022 Archived 944.1 MB .zip