VFDS and You

VFDs, or variable frequency drives, are the most efficient way to control fans and pumps when a variable speed is needed. A VFD allows precise control over the exact speed of a fan or pump so that the exact amount of air or water that is needed can flow. If flow is insufficient, buildings will often be left uncomfortable and if there is too much flow your system will be wasting energy. Proper VFD service is crucial to keeping building efficient and comfortable.

One of the first patents for a VFD was made in 1911 by a company then known as Brown, Boveri & Cie. Today, that company is known as ABB, and an ABB VFD is known as the top of the line when it comes to performance and control. A VFD is often controlled by a building automation system, to help achieve the exact flow desired by the VFD design. HVAC controls design often requires very specific flow that can only be achieved with a proper VFD install. 

A VFD works by receiving an electrical signal from an energy management system. Based on this signal, the VFD will send out energy to a fan or pump motor. A VFD is designed to start with a low voltage and frequency, then ramp up to the desired speed. This “soft start” helps preserve the life of the motor. The VFD also allows for a “soft stop” in the same way when needed, slowly ramping down until the motor is turned off completely. The mixture of energy savings and reduced HVAC maintenance saves substantial amounts of money over the life of a VFD.

A VFD is a great part of an HVAC controls system and goes a long way towards reducing cost. If you’re looking for a building controls specialist backed by the trusted name of ABB controls, then give us a call and we’ll help keep your building running efficiently and comfortably!