DS10xx
Installation
25
As shown in the layout, the earth wiring must be star like, where the earth
connection of various components ends in one only point electrically
connected with the metal chassis and the plant earth.
Also the wiring towards the drivers must be star like, with the center of the
star on C1 capacitor poles.
It is necessary, as per diagram, to place a filter in series to the transformer
primary winding to stop emissions coming from the driver and/or present
on the main supply. Furthermore, the filter must be able to support the
maximum power required by the driver plus the transformer losses.
It is obligatory to provide on every phase a fuse able to intervene in case of
a short circuit at the supply output or a malfunctioning of its parts.
The reduction level the filter must guarantee can vary a lot according to the
laws applied to the field to which the application and/or installation belong.
The producers of filters SHAFFNER and CORCOM can be a good
reference point to find the right filter.
In the following table the characteristic values of the main transformer
components are shown. In the calculation an oscillation of the main supply
voltage contained /-20% has been considered.
+
C1
Protections
and
Command
L1
L2
L3
PE
+ Driver 1
-
+ Driver 2
-
. . . . . .
+ Driver n
-
Three phase
transformer with
shield between
i
d
Filter
T1
Rectifier
PE
Main
supply
D1
Содержание DS10 Series
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