Schaffner Group
User and Installation Manual
Ecosine FS42842
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15
Filter application
ecosine
®
filters are designed as “load-applied” filters. In contrary to “bus-applied” filters, which are being
installed e.g. at the main power bus of a building, 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. This can be of vital importance when the same power bus supplies both motor drives and sensitive
loads. One example could be the elevator drives or HVAC drives in a hospital, where power must be very
clean for all the sensitive medical devices. In such a case, it would not be sufficient to use a central
harmonic filter at the PCC for IEEE Std 519-2014 compliance purposes.
ecosine
®
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.
Non-linear load 2: 75kW/400VAC
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.
2x FS42842-260-99
(2x 160kW/500VAC)
AC line reactors are not required when ecosine
®
filters are installed. For a new system, this helps to offset a
good portion of the harmonic filter cost. If a harmonic filter is added to a drive with an existing AC line
reactor, it is recommended to remove the reactor if possible.
Mains
Non-linear load: 300kW / 500VAC
