Schaffner Group
User and Installation Manual
Ecosine FS42842
18/43
11
Filter purpose and function
ecosine
®
harmonic filters are based on passive LCR filtering technology. They are intended for the
operation on the input side of balanced three-phase six-pulse rectifiers, like commonly used in inverters for
motor drives.
3~
ecosine
™
Motor drive
Motor
Six-pulse rectifiers inherently draw current in a non-sinusoidal fashion from the grid, creating a current wave
form rich in harmonics. Harmonic currents flow through system impedances and create harmonic voltages.
Both harmonic currents and voltages give raise to serious issues, such as electric system overload,
reliability problems, and violations against international standards and utility codes.
ecosine
®
filters efficiently reduce the harmonic currents to negligible levels and ensure, that a sine- wave
current is drawn from the grid. In the process, they also reduce peak currents and RMS input current,
allowing for lower wire cross sections in conductors, smaller fuses, breakers, and transformers. In existing
installations, more drives can be used on the same distribution transformer.
The examples on the next pages visualize typical performance test results with and without a Schaffner
ecosine
®
harmonic filter FS42842-210-40 for the rated load power of 110kW.
