Schaffner Group
User and Installation Manual
Ecosine
max
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2 Filter selection
Ecosine max passive harmonic filters need to be carefully selected and configured in order to enjoy
maximum benefits. Schaffner advices to verify the selection by using the Schaffner Power Quality Sim-
ulator tool SchaffnerPQS3, available at pqs.schaffner.com.
Step 1: Grid frequency
Determine, whether the system in consideration will be operated in a 50 Hz or 60 Hz electricity grid,
and select the corresponding filter series according to the following table:
50 Hz grid
Europe, Middle East, parts of Asia, parts of South America
FN 3470/FN 3471
FN 3480/FN 3481
60 Hz grid
North and Central America, parts of Asia, parts of South America
FN 3472/FN 3473
FN 3482/FN 3483
Note:
a 50 Hz filter will not provide satisfying harmonics mitigation in a 60 Hz grid, and vice versa.
Step 2: Grid voltage
Verify that the grid configuration is suitable for standard ecosine max passive harmonic filters accord-
ing to the following table:
50 Hz grid
Nominal voltage 380–415 V AC
TN, TT, IT configuration
50 Hz grid
Nominal voltage 440–480 V AC
TN, TT, IT configuration
60 Hz grid
Nominal voltage 380–415 V AC
TN, TT, IT configuration
60 Hz grid
Nominal voltage 440–480 V AC
TN, TT, IT configuration
Step 3: Rectifier type, presence of DC-link choke in drive
Refer Table 1 for filter performance.
Step 4: Rectifier/Drive input power
The individual filter must be selected with respect to the rectifier/motor drive input power in kW respec-
tively in HP. It is important to match rated filter power as close as possible with the effective input
power of the rectifier/drive.
Note that if the rectifier/drive is being operated very close to its rated power, then the filter can be se-
lected by the motor drive’s nominal power rating. However, if the drive will be operated e.g. at only
66% of its rated power, then a smaller filter should be selected in order to get maximum harmonics
mitigation performance and the optimum in terms of cost, size, and weight. In that case the customer
is responsible to ensure that ecosine passive harmonic filter will be operated within specification. This
is particularly important in terms of overload.
