User manual

Page 27
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
EL 9000 B HP Series
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 on the back side of the device and is not protected by a fuse. The cross section of the connection
cable is determined by the current consumption, cable length and ambient temperature.
For cables up to 5 m and average ambient temperature up to 50 °C, we recommend:
up to 20 A: 4 mm² up to 40 A: 6 mm²
up to 70 A: 16 mm² up to 85 A: 25 mm²
up to 170 A: 70 mm²
per connection pole (multi-conductor, insulated, openly suspended). Single cables of, for example, 70 mm² may
be replaced by 2x 25 mm² etc. If the cables are long then the cross section must be increased to avoid voltage
loss and overheating.
2.3.4.1 DC terminal
The table below shows an overview of the various DC terminals. It is recommended that connection of load cables
alwaysutilisesexiblecableswithringlugs.
M6 bolt on a nickel plated copper bar
Recommendation: Ring lugs with a 6 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 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. In case, the plastic DC cover is going to be used, only horizontal lead of the
cables is possible.