Mastering the World of VFDs: From Basics to Advanced SAKO Solutions

Table of Contents

What is a VFD?

A Variable Frequency Drive (VFD) is a motor control device that regulates the speed and torque of an electric motor by adjusting the frequency and voltage supplied to it. Rather than directly supplying the power at a constant frequency, a VFD modifies the frequency to meet the desired speed of the motor, hence its name.

Although the basic VFD alters frequency and voltage to control motor operations, this adjustment is often termed as ‘speed control’. This is because the primary outcome of the VFD’s operation results in changing the motor’s speed.

What is the main advantage of using a VFD?

There are multiple benefits and reasons to use a VFD, including:

  • Energy Efficiency: A VFD can optimize power consumption, ensuring that a motor uses only the energy it needs, leading to significant energy savings.

  • Customized Process Control: VFDs allow for tailoring the motor speed according to the specific needs of an application, ensuring optimal performance.

  • Reduced Mechanical Wear: By providing a controlled ramp-up and ramp-down during start-up and shut-down, VFDs can significantly decrease mechanical stress on motor components, prolonging their lifespan.

  • Noise Reduction: Operating motors at reduced speeds can minimize the noise generated, especially in applications like fans and pumps.

  • Enhanced Working Conditions: With improved control over motor operations, processes can be more stable, and the working environment can become safer.

  • Peak Demand Management: VFDs can help in reducing peak power demand, enabling users to benefit from lower peak-demand electricity tariffs and even reducing the necessary size of the motor.

In today’s world, with advancements in technology, VFDs are also incorporating networking technologies and diagnostic features. This integration provides better control, performance tracking, and improved productivity.

Primarily, VFDs find their use in controlling fans, pumps, and compressors. These applications alone make up for approximately three-fourths of all VFD applications globally.

While VFDs are advanced and adaptable, there are also other motor control devices such as soft starters and across-the-line contactors. A soft starter, being a solid-state device, offers a gradual ramp-up to full operational speed, ensuring full acceleration and a smooth start. Conversely, an across-the-line contactor directly supplies full voltage to the motor, without any modulation.

In essence, for applications requiring versatile speed and torque control, combined with energy efficiency, a VFD emerges as the top choice.

Where can I use a VFD?

VFDs are commonly used in various industries to control the speed and torque of an AC motor. This precise control can lead to energy savings, process improvements, and longer equipment life.

From huge factories to your local gym, the applications are surprisingly vast. Let’s break it down:

HVAC Systems

HVAC (Heating, Ventilation, and Air Conditioning) systems are perhaps the most well-known application. Here, VFDs help in adjusting the speed of fans and pumps, optimizing the airflow and saving significant energy.

Pumps and Water Systems

If you’ve got a pump system – be it for water, wastewater, or irrigation – using a VFD can assist in maintaining pressure levels without needing separate tanks or valves.

Conveyors and Production Lines

In factories and assembly lines, having the ability to adjust the speed of conveyors is crucial. VFDs let us ramp up or slow down based on the production needs.


Yep, even the elevators you use daily. By adjusting the motor speed, VFDs ensure smooth starts and stops, giving you that seamless ride.

Fans and Ventilation Systems

Be it in commercial buildings or large infrastructures, adjusting fan speeds with VFDs helps maintain the right air quality and temperature.

And many more…

The beauty of VFDs is their versatility. From textile mills to food processing units, the possibilities are vast.

Proper VFD Installation: What You Need to Know?

Proper VFD installation is imperative for optimal performance, safety, and longevity of both the drive and the equipment it controls. When correctly installed, a VFD can bring forth unparalleled efficiency and control.

Choose the Right Location

First and foremost, ensure the VFD is located in a well-ventilated area, away from direct sunlight, corrosive gases, or excessive dust. This helps in preventing overheating and prolongs the device’s lifespan.

Maintain Adequate Spacing

Always make sure there’s ample space around the VFD for airflow. This minimizes the risk of overheating and allows easier maintenance access.

Grounding is Essential

Proper grounding is paramount. Always use a ground conductor that meets the recommended size and grounding methods. This reduces the risk of electrical interference and ensures safety.

Use the Right Cabling

Opt for shielded cables specifically designed for VFD applications. This helps in minimizing electrical interference, ensuring smooth VFD operation.

Keep Input and Output Wires Separate

Always route the power input and motor output cables separately. This reduces the potential for feedback interference or cross-talk between cables.

Check the Voltage and Frequency Ratings

Before powering up, double-check the VFD’s voltage and frequency ratings to ensure they match the power source and the motor’s requirements.

Configure Parameters Carefully

Based on the motor’s specifications and the application’s requirements, configure the VFD parameters. Most modern VFDs come with user-friendly interfaces that guide you through this process.

Perform Regular Maintenance

Lastly, while not part of the initial installation, regular maintenance checks are crucial. Keep an eye out for any signs of wear, damage, or dust accumulation, and clean or replace components as needed.

Why should I use a VFD/ Inverter from SAKO?

SAKO VFDs stand out for their state-of-the-art technology, reliability, and unmatched after-sales service. These drives are the culmination of extensive research, field testing, and feedback from users like you.

Pioneering Technology

At the heart of SAKO lies a spirit of innovation. Every VFD we design is replete with the latest technological marvels, ensuring you enjoy stellar performance, outstanding efficiency, and a user experience that’s second to none.

Built to Last

Reliability isn’t just a buzzword for us; it’s a promise. Our VFDs are put through their paces, ensuring they can brave the most challenging environments and deliver consistently, rain or shine.

Energy Efficiency Par Excellence

Energy savings are crucial, and with a SAKO VFD, you’re playing in the big leagues. Our drives are crafted to slash energy consumption, translating to palpable reductions in your operational costs.

Tailored to Perfection

We get it: One size doesn’t fit all. That’s why we offer bespoke solutions, ensuring every SAKO VFD aligns seamlessly with your operational nuances.

After-sales Support Like No Other

Once you join the SAKO family, we’re with you every step of the way. Our dedicated after-sales brigade is always at the ready, be it for installation, troubleshooting, or routine maintenance.

More Bang for Your Buck

Top-tier quality sans a hefty price tag? That’s the SAKO way. We ensure you enjoy premium quality without burning a hole in your pocket.

Our Global Footprint

No matter where you are on this big blue planet, our extensive global network ensures you’re never too far from a SAKO touchpoint. Prompt deliveries, local support – we’ve got you covered.

Distinctive Features that Set Us Apart

SAKO VFD products tower over the competition, thanks to an arsenal of unparalleled features:

  • V/F control

  • Vector control

  • Output torque control

  • An integrated RS-485 communication interface

  • Compact size complemented by effortless installation

  • Overcurrent, overvoltage, undervoltage, and short circuit protection

  • A copper coil that boosts performance and load capacity

  • An independent air duct design, ensuring consistency in performance.

By championing these unique attributes, SAKO VFD firmly cements itself as the crème de la crème in the market.


Selecting a VFD goes beyond just a product choice; it’s about forming a bond built on trust, dependability, and collaboration. With SAKO, you’re not just purchasing a VFD; you’re forging a partnership. Revel in the SAKO difference, and let’s embark on this electrifying journey together.


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