Three Phase Inverter

A three-phase frequency inverter — also called a three-phase VFD or AC drive — controls the speed and torque of a three-phase AC motor by adjusting the frequency and voltage of its three-phase output. It takes three-phase AC input and outputs three-phase AC at variable frequency, enabling precise motor speed control from near-zero RPM to well above rated speed.

Three-phase VFDs are the standard choice for industrial and commercial applications where three-phase power is available: electric motors, pumps, fans, compressors, conveyors, CNC machinery, and HVAC systems. Compared to single-phase configurations, three-phase drives offer higher efficiency, lower input current per phase, and support for larger motor ratings.

Inverter.com stocks GK3000-series three-phase VFDs from 0.75kW to 220kW, including 480V input models for North American industrial installations. Some in-stock products can be shipped from Los Angeles, CA. 

Frequently Asked Questions

• Q1: What is the difference between a three-phase VFD and a single-to-three-phase VFD?
  A1: A three-phase VFD requires a three-phase AC input and is used where a three-phase supply is already available. A single-to-three-phase VFD accepts single-phase input and converts it to three-phase output, for use where only single-phase power is available. If your facility has three-phase service, a three-phase input VFD is more efficient and supports higher power ratings.
• Q2: Do your three-phase VFDs support 480V input?
  A2: Yes. Inverter.com stocks 480V three-phase input VFDs from 0.75kW through 220kW, designed for North American industrial installations.
• Q3: What communication protocols do the GK3000 VFDs support?
  A3: RS-485 Modbus RTU is standard on all GK3000-series three-phase VFDs, suitable for most PLC and SCADA integration. Contact our technical team for custom protocol requirements.
• Q4: Can three-phase VFDs be used for pump and fan speed control?
  A4: Yes — pump and fan control is one of the most common VFD applications. The built-in PID controller supports direct connection of a pressure or flow sensor for closed-loop control. Reducing fan or pump speed by 20% typically cuts energy consumption by close to 50% due to the Affinity Laws.