Connection To Dc Loads - Elektro-Automatik PS 9000 1U Betriebsanleitung

PS 9000 1U Series
2.3.5

Connection to DC loads

• In the case of a device with a high nominal current and hence a thick and heavy DC
connection 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 output, a strain reliever should be used.
• Connection to and operation with transformerless DC-AC inverters (for example so-
lar inverters) is restricted, because the inverter can shift the potential of negative
output (DC-) against PE (ground), which is generally limited to max. 400 V DC.
The DC load output is on the rear 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 1.5 m and average ambient temperature up to 50°C, we recommend:
up to 10 A: 0,75 mm² (AWG18)
up to 30 A: 4 mm² (AWG10)
up to 60 A:
16 mm² (AWG4)
per lead (multi-conductor, insulated, openly suspended). Single cables of, for example, 70 mm² may be replaced
by e.g. 2x35 mm² 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
The table below shows an overview of the various DC terminals. It is recommended that connection of load cables
always utilises flexible cables with ring lugs.
M6 bolt on a nickel plated copper bar
Recommendation: Ring lugs with a 6 mm 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 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.
EA Elektro-Automatik GmbH
Page 24
Helmholtzstr. 31-33 • 41747 Viersen
Germany
up to 15 A: 1,5 mm² (AWG14)
up to 40 A: 6 mm² (AWG8)
up to 100 A:
25 mm² (AWG2)
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
ea1974@elektroautomatik.de