Electricial Installation
Operating instructions SVCD(S)
67
123456278
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419A58
Elektrotechnische Anlagen GmbH
1
4.6.4
Remarks
Generally a system should be divided in an area for power electronics and an area for
control electronics. This is not only important, if the system is mounted in one cabinet,
but even also if it is spread over several cabinets. As of the strong noise emission of the
power wires it is recommended to mount a screening wall. This wall must have a low re-
sistive contact to the frame or the mounting plate (remove lacquer!).
The installed power feedback unit and the connected RFI-filter must form an integrated
whole, i.e. they have to be connected via the mounting plate without an isolating lacquer.
The connection wire between power feedback unit and RFI-filter must be screened. At
both ends the screen has to be connected to ground. The wire should not be longer than
300mm.
The mounting plate of the power feedback unit should be the star point for the whole
grounding and screening of the machine or plant. If the drive or other components of the
plant cause interference, the HF connection of these components is bad. This could be
improved by an additional potential equalisation.
By using RFI-filters the leakage current is increased. As the leakage current is higher than
3,5 mA, one of the following conditions must be fulfilled:
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Cross section of the protective wire must be at least 10 mm² CU.
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Supervision of the protective wire by an module, which trips in case of an fault.
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Install a second wire in parallel to the protective wire via separate terminals. This wire
must be conformal with VDE 0100 / part 540.
