II K 5-9
Installation
5
Separation
transformers
A separation transformer makes line chokes unnecessary because
of its leakage inductance, and a grounded screen between its
windings saves an EMC filter, see
1
and
4
. The screen and the iron
core must be well connected with the mounting plate of the con-
verter. If the transformer is located outside the converter cubicle
the screen of a screened 3-phase cable ("first" environment, figure
5.2-1 at the right) or a ground cable ("second" environment, figure
5.2-1 at the left) must make this connection (see also
24
"Connec-
tion example").
6
Converter (dedi-
cated) trans-
formers
A converter (dedicated) transformer transfers high power directly
from a medium voltage line to a single large converter or to a local
low voltage line for several converters (see
20
). Furthermore it acts
as separation transformer according to
5
.
If such a converter transformer has no screen the EMC demands
are nevertheless fulfilled in most cases because the RF interfer-
ence energy can hardly get via the medium-voltage line and the
transformer of the public line to the loads which must be protected
against pertubances. In the case of a dispute a measurement must
be done at the point of common coupling (public low - voltage line)
according to EN 61 800-3.
7
Installation hints
8
Cabinets
All metal cubicles available on the market can be used; however,
their mounting plates must have well conducting surfaces accord-
ing to
9
.
If a drive system is placed in more than one cubicle their mounting
plates must be connected by broad pieces of well conducting sheet
metal.
9
Mounting plate
The mounting plate must be made from steel with zinc surfaces
and without any painting. The PE copper bar must be mounted di-
rectly on the mounting plate without any insulating means between,
and it must be connected with the plate by several bolts distributed
in equal distances along its length.
10
Placement of
devices
The converter, the line choke, fuses, contactors and the EMC filter
are to be placed on the mounting plate so that the connections can
be made as short as possible, especially those from the converter
via the line choke to the filter, and that the requirements in
15
can
be fulfilled. The surface of the components to be mounted on the
mounting plate has to be free of coating material (see
28
).
Summary of Contents for DCS 400
Page 24: ...II K 3 14 Technical data ...
Page 29: ...II K 4 5 Overview of Software ...
Page 158: ...II K 6 36 Operating Instructions ...
Page 181: ...II K B 1 Appendix B Declaration of conformity ...
Page 190: ...Notices ...
Page 191: ...Notices ...