Variable Frequency Drive (VFD)

Variable Frequency Drive (VFD) is a state of art method for speed control of induction motors. It gives precise, stable, accurate and stepless speed control of induction motors. Power interruptions are very common in industry and whenever input power to VFD is interrupted for a period more than about 2 seconds the VFD trips and interrupts the production process. This interruption in process leads to exorbitant losses in some processes due to:

• Loss of material in process.
• Time lost in restarting the process
• Man-hours lost in restarting the process Low morale of production staff if such interruptions are more.

Operation of Battery Back Up system: When mains input is present, it also charges the battery bank, through the charger. When there is mains failure, the battery will discharge through the inverter of VFD and provides the back up power to the load connected to inverter during mains failure. The time for which the battery can provide the back up depends upon the Ampere Hour (AH) capacity of the battery.

When the mains power is resumed, the inverter gets power from the mains input through rectifier and battery gets recharged from the mains power through charger.

This way the Battery-backed-Up VFD can ride through the power outages.