It can be rather misleading entirely focusing on the kind of speed a variable frequency drive has. This is because there are other elements that ought to be looked into in order to ensure that you use the right VFD. Here are some of the elements that you ought to assess.
Before buying the variable frequency drive it is ideal that you know your motor current demands. With this in order for you to know the precise full load current requirement then ensure that you check on the nameplate. A case for example if your motor has a single-phase power then it is ideal that use drive ratings that are of single-phase power.
While choosing the variable frequency drive it is ideal that you confirm that the drive can handle overload conditions that you might experience intermittent extra loading or when starting it up. Hence you might be required to up-size the drive time to time in order to find a drive that can handle your motor. In most cases, if the AC drives are usually designed to operate at 150% overload for a period of 60 seconds. However, if the variables are higher then you ought to choose an oversized drive.
You ought to know that there are various types of application type. There is constant torque and variable torque. You ought to know that various systems tend to use dissimilar application type. Knowing the application type is often important because the drive specifications are usually organized. With this, if you are using pumps or fans it is ideal that you make use of variable torque.
The air tends to become less dense when the altitude increases. With this less density tend to decrease the cooling properties of air. Most VFD are usually designed to operate at 100% capacity of altitude. However, if the VFD is positioned at a higher altitude then it ought to be oversized as it will help compensate the decrease in cooling.
While choosing a variable frequency drive then it is ideal that you buy one that has the lowest carrier frequency. It is not simply finding the right VFD especially if it is the first time buying the drive. With this, if you do not want to make any errors while buying the drive it is ideal that you talk to a professional. The expert will ensure that they have comprehensive information on the kind of motor you will be using in order for the drive to meet its demands.
Learn more about variable frequency drive at https://en.wikipedia.org/wiki/Variable-frequency_drive