Installation
page 58
ELTROPLAN-REVCON
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 resistive 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 compo-
nents 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:
-
Cross section of the protective wire must be at least 10 mm² CU.
-
Supervision of the protective wire by an module, which trips in case of
an fault.
-
Install a second wire in parallel to the protective wire via separate ter-
minals. This wire must be conformal with VDE 0100 / part 540.