Schaffner Group
User and Installation Manual
Ecosine evo
October 2018
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7. Filter application
Ecosine evo passive harmonic filters are designed to mitigate harmonic current of non-linear loads, in
particular of three-phase diode-type rectifiers. Contrary to “bus-applied or PCC” filters, which are being
installed e.g. at the main feeder, they are specifically designed to be used with either an individual non-linear
load, or with a group of non-linear loads.
One advantage of load-applied filtering is the fact that the upstream power (relative to the harmonic filter) is
clean, i.e. unloaded by the harmonics. This can be of vital importance when the same power bus supplies
both motor drives and sensitive loads. Ecosine evo passive harmonic filters are also suitable for paralleling
lower power non-linear loads on a higher power harmonic filter to improve overall system economy. In this
case the total expected load power of all connected drives must match the filter.
If the expected input power exceeds the rating of the largest available filter, and a custom solution is not
desired, then two or more filters can be wired in parallel. In this mode of operation, it is recommended to use
filters with equal power ratings to ensure proper current sharing.
