Electricial Installation
Operating instructions SVCD(S)
65
123456278
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419A58
Elektrotechnische Anlagen GmbH
1
Use copper or tinned copper screened wires only, as steel screened wires are not suit-
able for high frequency applications. Connect the screen with metal clamps or metal
glands to the equalisation bars or PE-connections. Don’t longer the screen with single
wires!
If external RFI-filters are use, these have to be mounted not more than 30cm away from
the noise source and with a very good, low resistive based contact.
Inductive switching units (relay, magnetic contactor and so on) have to be equipped
with varistors, RC-circuits or suppressor diodes always.
All connections have to be as short as possible and must lay as close to the ground po-
tential as possible, as free hovering wires act like aerials.
Avoid wire loops in all wires. Connect unused wires to ground at both ends.
If unscreened wires are used, twist the pairs to attenuate unsymmetrical noise.
4.6.2
Connection of a RFI-filter
The following figure shows mounting and connection of an external RFI-filter.
Connected earth conductor
Shield bus of copper, connected
superficially with the mounting plate
Mounting plate
Additional earthing strap
Power line
Interference filter connected
superficially with the
mounting plate
Potential equalisation to the
earth
Filtered line to the
frequency converter
