The benefits of using the Frequency control VFD with integrated, all-pole effective sine filter
• The sinusoidal shape of the VFD's output voltage provides a restriction to the voltage rise rate. Transient waves are prevented, there is no limitation to the motor cable length. The stress on the motor insulation is no greater than that when the motor is operating with a direct mains connection.
• Radiated electro-magnetic noise from motor cables is reduced, such that shielded motor cables are not necessary.
• Bearing currents do not occur in the motors. No capacitive compensating current in motors. No danger to the motor bearings.
• Elimination of disturbing harmonic oscillations that arise due to the VFD's switching principle. This also prevents additional temperature rises in the motor, losses in the motor are reduced, resulting in energy savings.
• No electromagnetic excitation in the connected motors, this means silent motor operation is possible
• Unlimited parallel operation of multiple motors is feasible without any problem

Many benefits result from using the all-pole effective sine filter equipped Frequency control VFD in place of standard AC drives. The most important of these is the elimination of the potential motor hazards associated with the use of standard VFDs, and the resultant increased reliability of the industrial plant so equipped. more from VFDs.in