The steps and considerations for selecting a Variable Frequency Drive (VFD) are mostly straightforward. In fact, the nameplate on the motor usually provides the essential information, such as voltage and horsepower. Once you determine whether it will be installed indoors or outdoors, and if it needs communication, you’re almost done!
The final question is often the most misunderstood: Is a bypass needed? Why or why not? Let’s look at when you should include a bypass and the different types of bypasses available.
Option 1 is the drive only without any disconnect or bypass. The most common is Option 2, which includes a fused disconnect. These disconnects are required by most electrical codes and a good idea in general. If your electrician does not add a disconnect during installation, you can order one with your new drive.