If you are in the process of selecting an AC drive for your application, then you have come to the right place. Here, we will identify the steps to choose the right AC drive as per your needs.
Identify the motor voltage, horsepower, and full-load amperage
You can find these specifications in the motor’s nameplate. Just keep in mind that most motors can be corrected for various voltages and usually have different amperages listed on their nameplate. Ask the manufacturer if you are confused and need further clarification before making the purchase.
Pick your control mode
The next step is to pick the control mode that suits your application. You can also find this in the motor specification. For instance, a volts/hertz control mode might be a good option if your application has something to do with pumps or fans. On the other hand, sensorless vector or FOC control mode may be the most suitable option for applications that need about a hundred percent torque.
Know the I/O requirements of your AC drive
For the AC drive to interface with other devices like selector switches or pushbuttons, digital inputs can be used. They are often used to serve several functions like forwarding/release, preset speed selection, fault reset and more. Digital outputs are also used to connect the drive to other devices like alarms and auxiliary relays. Be sure to determine the requirements for your applications beforehand to avoid confusion.
Know the location of the keypad and communications requirements
If your AC drive is installed in a place that is not easily accessible for the operator, then remote mounting is needed. Which may call for more cabling and installation of other accessories. You have to determine where the keypad must be located.
More importantly, you also have to know the communications requirements for your drive application. If it requires a communication interface to connect with other devices in your facility, then this device will most likely replace the need for digital or analog I/O. It can also help monitor the status of your drive’s parameters, such as the speed.
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