The Basics of Variable Frequency Drive Panel

VFD is an acronym for Variable Frequency Drive. It is a motor device used for controlling AC motor speed and torque by changing the input voltage and frequency in electro-mechanical systems. This device is present in appliances ranging from small to large systems. VFD is also referred to as an adjustable speed drive, AC drive, inverter, adjustable frequency drive, micro drive, or variable speed drive.

The variable frequency drive panel is used for regulating and controlling the electric motor’s and feed pump’s speed. It is typically used in large machines, like compressors, conveyors, drilling, pumping, etc. Frequency and electric motor’s speed are directly proportional to each other.

Why choose VFD panels? They incorporate two significant features – smooth start and stop capabilities, and adjustable speed, making VFDs more sturdy controllers. These panels offer benefits in terms of energy conservation and process control. Below are some advantages of variable frequency drive panel:

  1. Produces a high power factor.
  2. Conserves energy.
  3. Smooth and soft operation.
  4. Positions motor speed accurately.
  5. Uses less current during starting and operating.

VFD’s Components

There are four primary components in every variable frequency drive – rectifier, intermediate circuit, inverter, and control unit. The rectifier changes the incoming alternating current (AC) to the direct current (DC). Using capacitors and inductors together, the DC supply is given to the intermediate circuit. The inverter converts the DC supply from the intermediate circuit into the alternating current (AC). Lastly, the control unit is the heart of the VFD, which monitors all operations.

VFDs Applications

The variable speed drive has several applications. It is used in several appliances, from small to large devices, like the cooling tower, boilers, constant air volume, elevators, conveyor systems, pump controls, and many other devices. Most customers buy VFD due to less power consumption and less setup cost features. Unlike all other controllers, VFDs are highly efficient in saving energy. Therefore, using VFDs in large plants is beneficial, as it reduces energy costs.

Using VFDs can save considerable amounts of electrical energy, as they control the speed by changing the frequency and voltage. VFD panels have an enclosed structure used for protecting applications from water and weather. These panels differ according to applications and functions.

Also Read- VFD Retrofit Options and Benefits for Units and Plants