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3.7 Mains filter
The emission depends on the length of the motor cables. If the
required limit value is not reached with the internal mains filter, you
must use an external mains filter.
See manual of the respective product for information on mains filters.
The mains filter for several drives with a common AC fuse must be
rated in such a way that the nominal current of the external mains filter
is greater than the total of the input current of the drives.
The fuse rating of the fuse upstream of the external mains filter must
not be greater than the nominal current of the external mains filter.
Mount the external mains filter in such a way that the lines from the
mains filter to the drives are as short as possible. For EMC reasons,
route the cables from the mains filter to the drives separately from the
line to the mains filter.
External three-phase mains filters do not have a neutral conductor
connection; they are only approved for three-phase devices.
PC/- PA/+ PC/- PA/+
DC+
DC
-
L3
L2
L1
L2 L1L3 L2 L1L3
L3
L2
L1
L3'
L2'
L1'
Figure 12: Wiring of an external mains filter, example shows three-phase
drives.
See the manual of the respective product for information on external
mains filters.
3 Engineering
LXM32
38
Common DC bus
MNA01M001EN, V1.01, 08.2014