VFDs are now very commonly used for several applications. With the increasing number of applications, even the varieties in which they are now available has increased significantly. With so many different varieties to choose from, buyers sometimes get confused with the benefits that VFD panels offer. In this post, we’ll have a look at 6 such common misconceptions.
The controlled performance and energy savings offered by VFDs has made them a popular choice for an extensive range of commercial applications. But as the number of applications has increased, so have the varieties and prices in which these panels are now available.
Due to this significant increase in their varieties, a number of misconceptions have been established among buyers. If you are planning to buy VFDs for a commercial application, it is important first to bust these misconceptions. 6 of the most common ones have been busted below.
1. It is difficult to control and program a VFD panel
Many of the modern VFD panels come with an extensive range of parameters which you can set. However, this doesn’t mean that these panels are difficult to control and program. You are not required to set all the available parameters to use the panel. The additional parameters are just to offer enhanced functionality for different applications.
2. The level of energy savings will remain same in every application
A major advantage of using VFD is the energy savings that they offer. However, the savings vary between applications. For instance, the energy savings are much higher when a VFD is used along with a pump or fan application as in most cases they are not required to run at maximum speed. However, the savings wouldn’t be as high when being used with a motor.
3. VFD panels are very expensive
It is very commonly believed that VFDs are far more expensive than the conventional starters. As a matter of fact, the prices have reduced significantly in the past few years due to the increasing competition among VFD manufacturers. It is also important to note that the energy savings that these panels offer easily make up for the buying expenses within a few months or years.
4. VFD panel size should be selected on the basis of the HP of a motor
It is also believed that the horsepower of a motor is the correct way to select the right variable frequency drive panel. There are a number of factors that can affect the HP of a motor and you might end up a panel of the wrong size. Rather than the HP of the motor, check its FLA (Full Load Amp) rating to pick the right size of VFD panel for your application.
5. VFD panels only work with special motors
It is commonly believed that VFD panel needs a special motor to function. The reality is that any 3-phase induction motor can be used with a VFD. However, there are some important considerations, like if you are using an old motor, you’ll have to check its insulation rating to know whether it's wire is rated for inverter duty.
6. VFDs eliminate the mechanical and electrical stress
VFDs can eliminate mechanical and electrical stress, but in some cases, they can also generate high-frequency currents in the power system. As a result, it is often recommended that you should use a line reactor to control the power pollution and harmonics caused by the VFD panel.
Now that you know about the popular misconceptions about variable frequency drive panel, it’d now be much easier to understand the actual benefits of these panels and select the right panel for your application.