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The Basics of Variable Frequency Drives (VFD)

Over the past several years, the aquatic industry has become more innovative, introducing owners and operators to new technologies and advancements which ultimately create opportunities to improve safety, increase longevity of the facility, and even provide energy savings. One of the advancements the aquatic industry has been very enthusiastic about is Variable Frequency Drives (VFD's).

 

WHAT IS A VFD?

A VFD is essentially a power conversion device. VFD's convert basic fixed-frequency and line power to a variable frequency and variable-voltage output which is used to control the speed of induction motors or pumps. Most VFD's are simple to install and are user friendly, however they are quite sophisticated in relation to their hardware and software operation.

 

The basic function of a VFD in the aquatic industry is to provide substantial energy savings. This is accomplished by controlling the speed of a pump rather than controlling flow through use of a throttling valve. Essentially, when you reduce the speed of a pump, you create energy savings.  In addition to energy savings, the life of the impeller, bearing and seal is greatly improved which leads to longer lasting pumps.

 

BENEFITS OF USING A VFD

  • Saves money on energy consumption.
  • Maintenance costs are lower due to the lower operating speeds resulting in a longer life for bearings and motors.
  • A soft starter for the motor is no longer required.
  • Controlled ramp-up speed in a pool system can eliminate water hammer problems.
  • With a compact and modular design, VFD’s do not take up a lot of space.
  • Protect against system overloads, motor failures, motor and drive overheating, voltage disturbances, power surges, loss of phase, ground fault, overvoltage, over current, under voltage, external fault, over temperature, etc.
  • Minimize motor noise and heating with adjustable switching frequency modulation.

WHAT CAN'T A VFD DO?

  • Boost the output voltage significantly above the input voltage.
  • Increase the output power of the pump or motor.
  • Fix mechanical problems.

Variable Frequency Drives are a great addition to any pool equipment room whether it’s new or existing. Not only do they save owners and pool operators on the costs associated with high energy consumption, but they also increase the longevity of the pumps and motors. VFD’s are available in different sizes (HP) and voltage requirements.

 

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