Vfd Vsd For Energy Saving - India

A VFD controls AC motor speed.

The drive converts the fixed supply

frequency (60 Hz) to a variable-frequency, variable-voltage output to

enable precise motor speed control.

Many VFDs even have the potential to

return energy to the power grid through their regenerative capability.

As energy is generated from slowing down or stopping the load, it must be dissipated somehow or the VSD will be damaged and all control will be lost.

Typically, this is done with a braking chopper (part of the VFD) and a large bank of resistors.

As might be expected, the bank of resistors simply is a way to dissipate the energy but it is wasted in the form of heat.

Essentially, the bank of resistors is a huge electric heater.

However, with a regenerative VSD, this energy can be captured and returned back to the facility power grid for use in other areas.

In addition, the bank of resistors is no longer needed.

In some cases, the method of braking needs to be cooled as well.

This is typically handled via a cooling system using pumps and cooling towers.

Using VFDs completely eliminates the need for a cooling system that would be required in those types of applications.

Company Contact:

• Posted By: VFD Manufacturer

• Phone: 912267059033

• Address: Daffodil, Sepal, Sama Savli Road, Behind Gangotri, Baroda Gujarat, India

• Email:

• Website: http://www.vfds.in/

• Business Description: VFDs.
  
  in Variable Frequency Drive used to control a motor's speed or
  
  torque can net substantial energy savings.
  
  But VFDs, also known as
  
  adjustable speed drives and variable speed drives (VSD), can induce
  
  unwanted motor shaft voltages.
  
  A maintenance free, long life shaft
  
  grounding ring that protects attached equipment as well as the motor's
  
  bearings is warranted.
  
  Bearing protection for induction motors
  
  A bearing protection ring is available for any NEMA or IEC motor size.
  
  It can be factory installed inside new motors or quickly and easily retrofitted even in the field using conductive epoxy (at right).
  
  VFD, used to control a motor's speed or torque, can net substantial savings in energy costs, up to 30 percent.
  
  Because of this, they have been cited as a key technology to make industrial HVAC systems, automated assembly lines, and other processes more energy efficient.
  
  But VFD, also known as variable speed drives (VSD) and ac drives, can induce unwanted motor shaft voltages.
  
  Without effective mitigation, these electrical discharges can destroy bearings, causing premature motor failure.
  
  In fact, the costly repair or replacement of failed motor bearings can wipe out any savings that an AC drive yields and severely diminish the reliability of an entire motor driven system.
  
  And when a VFD controlled motor fails, warranty claims against motor and VFD manufacturers may not pan out.
  
  Because systems that use VFDs are so varied, the liability question is a hot potato.