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Low Voltage Drives

As the leading low voltage VFD manufacturer, VEICHI provides a full range of products such as low voltage inverter at wholesale price. If you need high performance low voltage variable frequency drives for your system, then you've already come to the right place as VEICHI provides a wide range of ac drives choices that you can rely on. According to our customer requirements, VEICHI has developed AC600F, AC600, AC310, AC10, AC01 and more lower voltage frequency inverter models which are best selling products with great quality, outstanding performance, high stability and accuracy.

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More About Low Voltage Drives

What is Low Voltage VFD?

Low voltage VFDs are also called Low Voltage Variable Frequency Drives. They are used to control AC motors in low voltage power systems. The VFD's input voltage (AC power supply), typically below 690V, is rectified and filtered into DC voltage. The VFD then converts the DC voltage into adjustable frequency AC output voltage that matches the speed of the motor to be controlled. These electrical drives are used to control the speed and torque of low voltage electric motors. They control the speed and torque of the motors by varying the frequency and voltage of the power supplied to the motor. Low voltage AC drives are mainly used with low voltage AC motors in applications such as pumps, fans, conveyors, and general industrial machinery.

How to Choose a Low Voltage AC Drive?

Choosing the right low voltage VFD is critical for energy efficiency, motor protection, and system reliability. By following this selection guide, you can improve system efficiency, extend motor life, and avoid costly oversizing or undersizing.

1. Match Current, Not Power

Match the drive’s continuous output current to the motor’s nameplate full-load current (FLA).

2. Identify Load Type

  • Variable torque (pumps, fans): 110–120% overload
  • Constant torque (conveyors, hoists): 150–200% overload

3. Select Control Method

  • V/f: basic pump and fan applications
  • Sensorless vector: conveyors, mixers, general machinery
  • Closed-loop vector: cranes, winders, machine tools

4. Check Environmental Conditions

Verify ambient temperature and altitude. Derate if above 40°C or 1000m.

5. Review Installation Factors

  • Cable length: use load reactor or dv/dt filter for long runs
  • Harmonics: add DC link choke or AC line reactor if needed
  • Panel space: confirm mounting clearances and cooling
  • Motor insulation: use inverter-duty motor or output filter for long cables

6. Verify with Manufacturer

Confirm selection using motor nameplate data, load profile, and site conditions.

Frequently Asked Questions (FAQ)

Q1: What is the difference between a low voltage AC drive and a high voltage VFD?
A low voltage AC drive operates below 690V and is used in general industrial applications. A high voltage VFD operates above 690V and is used in heavy industries such as mining and cement.

Q2: Can I use a low voltage VFD with a single-phase motor?
No. Standard low voltage VFDs are designed for three-phase AC motors. Single-phase motors require a different type of drive or a phase converter.

Q3: How do I calculate the correct VFD size?
Match the VFD’s continuous output current to the motor’s nameplate full-load current (FLA). Then verify the overload capacity based on your load type (variable or constant torque).

Q4: What is the typical lifespan of a low voltage AC drive?
With proper installation and maintenance, a low voltage AC drive typically lasts 10–15 years, depending on ambient conditions and load cycles.

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