Connection To Dc Sources - Elektro-Automatik EL 9000 B Slave serie Betriebsanleitung

2.3.4

Connection to DC sources

In the case of a device with a high nominal current and hence a thick and heavy DC connec-
tion cable it is necessary to take account of the weight of the cable and the strain imposed
on the DC connection. Especially when mounted in a 19" cabinet or similar, where the cable
hangs on the DC input, a strain reliever has to be used.
The DC input is located on the rear side of the device and is not protected by a fuse. All models in this series are
designed to operate in parallel connection to at least another device of same rating, so the total current of the
parallel connection can be between 120 A (two units) and 8160 A (16 units). From a certain current the handling of
cables matching the current becomes impractical and the use of copper bars is required. The cross section of the
connection cables or copper bard is determined by the maximum current, cable length and ambient temperature.
For a parallel connection of 2 units, using flexible cables of up to 5 m length and an average ambient temperature
of up to 50°C we recommend following cross sections for a total current of:
120 A:
35 mm²
240 A: 95 mm²
1020 A:
4x 95 mm²
per lead (multi-conductor, insulated, openly suspended). Single leads with, for example, 70 mm² cross section can
also be replaced by 2x 25 mm² etc. For even longer cables the cross section must be increased to avoid voltage
loss and overheating.
2.3.4.1 DC terminal types
The table below shows an overview of the various DC terminals. It is recommended that cables are always con-
nected using ring lugs.
Type 1: Models with up to 360 V nominal voltage
M8 bolt on a metal rail
Recommendation: ring connector with a 8 mm hole
2.3.4.2 Cable lead and plastic cover
A plastic cover for contact protection is included for the DC terminal. It should always be installed. The cover for
type 2 (see picture above) is fixed to the connector itself, for type 1 to the back of the device. Furthermore the
cover for type 1 has break outs so that the supply cable can be laid in various directions.
The connection angle and the required bending radius for the DC cable must be taken into
account when planning the depth of the complete device, especially when installing in a 19"
cabinet or similar. For type 2 connectors only a horizontal lead can be used to allow for instal-
lation of the cover.
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
180 A:
70 mm²
420 A: 2x 70 mm²
Type 2: Models from 500 V nominal voltage
M6 bolt on a metal rail
Recommendation: ring connector with a 6 mm hole
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
EL 9000 B Slave Series
www.elektroautomatik.de
ea1974@elektroautomatik.de
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