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Start Seeing Savings When You Use a VFD With Synchronous Capabilities

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The savings keep coming when you use a variable frequency drive (VFD) with synchronous bypass and transfer capabilities. It can help reduce up-front capital costs and long-term energy and maintenance costs in various motor-control applications. And along with the cost savings, the VFD can help you increase efficiency and achieve more flexible process control.

A VFD with synchronous capabilities allows you to operate one motor continuously with variable speed control or to start and synchronize multiple motors. It also gives you the ability to soft start large motors.

So, take the time to see if the drive is right for your operations. It could put you in the good graces of everyone from technicians on the plant floor, who have fewer parts to maintain, to the CFO, who’s looking to rein in energy costs in production.

Operating One Motor

In this application, the VFD operates the motor continuously with variable speed control and can transfer the motor to the bypass source when necessary.

This application can increase overall system efficiency to achieve energy savings. And it can deliver more savings by removing, or not requiring, the use or maintenance of certain apparatuses.

In fan applications, for example, dampers can be removed or left open, because they’re no longer required to obtain variable airflow. And in pumps, valves can be left open, because they’re no longer required to provide flow control.

Operating Multiple Motors

Here, one VFD can start and synchronize multiple motors. This can reduce your full load current and your energy consumption and optimize your process.

The number of motors that can be operated is limited by external factors, like bus capacity and cabling limitations. But in some instances, the synchronous transfer application has been successfully applied to up to a 10-motor system.

There are two possible options in a multi-motor application. First, all motors can be of equal rating. Second, a range of motor horsepower can exist. In this second scenario, the drive system must be sized for the largest motor’s horsepower but also be able to control the smallest motor.

Soft-Start Application

This application is used to start motors, accelerate to full speed and transfer to the bypass source.

The drive is not intended for continuous application. Therefore, the ampacity rating of the drive can be reduced to match the starting requirement for the load. The drive is not rated for the motor horsepower rating, only the starting horsepower requirement.

Ready, Set, Save

To learn more about how VFDs with synchronous bypass and transfer capabilities can keep dollars in your budget and optimize your motor control, visit our website.

This post was co-authored by Gary Bankay.

Brad Bugiardini
Brad Bugiardini
Product Manager, Medium Voltage Drives, Rockwell Automation

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