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Variable Frequency Drives (VFDs) — Specifications Database
Search AC variable frequency drives from ABB, Siemens, Nord, Lenze, and other manufacturers. Filter by horsepower/kW rating, voltage class, phase, control method, and enclosure rating for motor speed control applications.
Key Specification Fields
Horsepower / kW Rating
Must match or exceed the motor nameplate rating
Input Voltage
230V single-phase or three-phase; 460V three-phase; 575V three-phase
Control Method
V/Hz (scalar), open-loop vector, closed-loop vector, or DTC
Enclosure Type
IP20 (panel-mount), IP55, IP66 (outdoor), or UL Type 4X
Output Current (A)
Maximum continuous output current to motor
Communication Protocol
Modbus RTU, EtherNet/IP, PROFIBUS, PROFINET, CANopen
Common Applications
- Pump and fan speed control
- Conveyor variable speed
- Compressor soft start
- HVAC air handling
- Process control
- Energy savings on centrifugal loads
Frequently Asked Questions
How do I select a VFD for my motor?
Match the VFD continuous output current rating to or above your motor full-load amp (FLA) rating. The HP/kW rating is a guide, but current is the true sizing parameter. Also match input voltage (230V or 460V), phase (1Ø or 3Ø input), and select an enclosure type appropriate for your environment.
What is the difference between V/Hz and vector control?
V/Hz (volts-per-hertz) control maintains a fixed ratio of voltage to frequency — it's simple and works well for fans and pumps. Open-loop vector control estimates motor flux and torque for better low-speed performance without an encoder. Closed-loop vector control uses encoder feedback for precise speed and torque regulation at all speeds.