User Manual

Page 30
ELR 9000 Series
www.elektroautomatik.de
[e-mail]
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
2.3.5 Connection to DC sources
In the case of a device with a high nominal current and hence a thick and heavy DC con-
nection 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 load input is on the back side of the device and is not protected by a fuse. The cross section of the con-
nection cable is determined by the current consumption, cable length and ambient temperature.
For cables up to 1.5m and average ambient temperature up to 50°C, we recommend:
up to 30A: 6mm² up to 70A: 16mm²
up to 90A: 25mm² up to 140A: 50mm²
up to 170A: 70mm² up to 210A: 95mm²
up to 340A: 2x70mm² up to 510A: 2x120mm²
per connection pole (multi-conductor, insulated, openly suspended). Single cables of, for example, 70mm² may
be replaced by 2x35mm² etc. If the cables are long then the cross section must be increased to avoid voltage loss
and overheating.
2.3.5.1 DC terminal types
The table below shows an overview of the various DC terminals. It is recommended that connection of load cables
always utilizes exible cables with ring lugs.
Type 1: Models from 60A input current Type 2: Models up to 44A input current
M10 bolt on a metal rail
Recommendation: ring connector with a 10mm hole
M6 bolt on a metal rail
Recommendation: ring connector with a 6mm hole
2.3.5.2 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 xed 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.