CE Conformity, Directives and Standards
KeTop T50VGA
154
User's Manual, Version: 1.3
© KEBA 2007
the metal housing on one side, and X-capacitors (connected between the
phases or between phase and neutral).
PE'
device
net
P'
N'
P
N
PE
Line filter
The desired filter effect is basically governed by the correct contact be-
tween the filter housing and the shielded housing of the device. The line fil-
ters 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.
Line filter
Line filter well
connected to the
housing.
L, N and E as short as possible!
Clips for screen contacting
Line cable outside
the equipment
(shielded or unshielded)
Device
Shield is required in this section!
Correct connection of a compact line filter
If the line filter is placed outside the shielded housing, the device connec-
tion 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 exter-
nally where it could penetrate other systems. It also prevents the penetra-
tion of interference signals back into connection wires that have already
been filtered.