Fig.14-6:
Line filter
The desired filter effect is basically governed by the correct contact between
the filter housing and the shielded housing of the device. The line filters must
therefore be placed directly at the inlet to the shielded housing of the device
and a very good connection must be made between the metal housing of the
filter and the shielded housing of the device.
If placement at the inlet is not possible for reasons of space, partly shielded
connection lines must be used. In doing so the following procedure is to be
followed:
If the filter is placed inside the shielded housing of the device, the line cable
must be shielded from the inlet through to the line filter and the cable shield
contacted on both ends. This prevents the propagation of interference on the
line cable inside the device. It also prevents any electromagnetic fields that
may be present inside the device from penetrating the line cable.
Fig.14-7:
Correct connection of a compact line filter
If the line filter is placed outside the shielded housing, the device connection
line must be shielded from the line filter through to the shielded housing of the
device and the cable shield must be contacted on both ends. This prevents
interference produced by the device from being transmitted externally where
it could penetrate other systems. It also prevents the penetration of interfer-
ence signals back into connection wires that have already been filtered.
CE Conformity, Directives and Standards
© KEBA 2009
User's Manual V1.50
147