How to Choose the Right Variable Frequency Drive?

Posted on 8th Dec 2022

There are wide range of variable frequency drives (VFDs) available, each designed to match a unique application. This article by Darwin Motion – VFD design and development service provider will review the key factors that will help you out in making right buying decision.

There are many factors you need to consider when choosing a VFD for any type of drive system. Some of the factors are related to the end-application, the motor you are utilizing, and the actual longevity of the VFD. Here are some of the biggest factors you can consider when choosing a VFD:

1. The incoming power supply

The drive system power supply defines the actual capacity in your system. VFD must be chosen based on compatibility such as voltage and frequency, current capacity and available kVA with its power supply.

2. The types of motor

Usually, various induction motors can advantage from having a Variable Frequency Drive these include higher efficiency. PMSMs (Permanent magnet synchronous motors) are not self-starting and required a VFD for operating. Some VFDs are available with permanent magnet motor control choices like a standard feature, permitting workers to control the permanent magnet motor for driving machine efficiently.

3. Current, voltage and frequency of motor rating

A VFD must never be chosen based upon the KW or HP power rating of the motor alone. You must ensure that the Variable frequency drive can deliver the nameplate current of motor rated continuously. Permitting for any needed overload.

4. The application type

The application type HD or ND for instance. Many Variable Frequency Drives are only made to be utilized on normal duty or simple duty loads like centrifugal fans or pumps and will only bear agiler overloads for short time frame. Some Variable Frequency Drives are ‘Dual Rated’ and can be utilized on any HD or ND/LD loads.

5. The environment of installation

Most Variable Frequency Drive can work up to 50⁰C but some de-rating will be essential. It is crucial that the Variable Frequency Drive maximum working temperature is not surpassed or premature failure could take place. If a Variable Frequency Drive is to be installed in an enclosure, the heat made by switching losses in the Variable Frequency Drive must be eliminated from the enclosure to stop the VFD maximum working temperature being surpassed. This can be attained by connecting extract fan(s) and air intake(s) or a modified chiller pack.

Choose the right IP rating for the Variable Frequency Drive determined by if it will be connected in an enclosure or straight onto a wall, machine leg or pump skid.

Make sure condensation that can take place if the Variable Frequency Drive is exposed to high temperature changes like day sun to night time ice. Consider utilizing a thermostatically controlled panel heater, for instance.

6. Harmonics

When connecting Variable Frequency Drives, the effect on the of power supply must be considered. Harmonic currents put an adverse effect on transformers, cables and delicate electronic devices, so network operation companies will contend that particular harmonic restrictions are adhered to before connecting Variable Frequency Drive loads onto a novel or existing network.

If you looking for VFD drive? Talk to Darwin Motion specialists

Darwin Motion supports every users and electrical contractors in various industries to dimension their drive system and pick the right VFD for their project. Whether you are operating on a fan or pump, or a heavy-duty application, Darwin Motion VFD drive range AC Drive, Solar Drive - MATRIX 180, VFD/SVC/Drive - MATRIX 190, Torque Mode Drive - MATRIX 500, High Performance Drive - MATRIX 680, Regenerative Drive -MATRIX 880, High Frequency Drive HF - MATRIX 500-HF will be best for installation.