Technical data

81
EMI filters
Because of their intrinsic characteristics, all frequency
inverters often generate undesired high frequency
voltages generally referred to as “interference”.
Mains filters are installed to reduce this interference.
Within the European Union reference standard EN
EN61800-3 defines the thresholds for electromagnetic
interference for different classes of equipment.
Active Cube series frequency inverters up to size
9.2 kW can be ordered with a built-in EMI filter
conforming to the requirements of the standard for
“class A – group 2” environments.
Two series of external interference filters are available
for larger size Active Cube frequency inverters and
for installations where conformity to the stricter
requirements of class B is necessary. The two series
differ both in construction and power range.
The first set of filters are “backplate filters or foot
print”. They are available in sizes 7 to 40 A (suitable
for Active Cube frequency inverters up to size 4), and
allow the frequency inverter to be installed on board
the filter itself. The second series of filters are “book
filters”. They cover all other Active Cube sizes up to
130 A and are designed for installation on the same
mounting panel alongside the drive.
Mains filters with very low dispersion currents are
available upon request for specific applications.
Basic circuit diagram
L1
L2
L3
PE
L1
L2
L3
PE
L1
L2
L3
L1
L2
L3
PEPE