User manual

Page 62
EL 9000 T Series
www.elektroautomatik.de
[e-mail]
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
3.11 Other applications
3.11.1 Series connection
Series connection is not a permissible operating method for electronic loads and must not be
installed or operated under any circumstances!
3.11.2 Parallel operation
Multiple devices of same kind and ideally same model can be connected in parallel in order to create a system
with higher total current and hence higher power. This can be achieved by connecting all units to the DC source
in parallel, so the total current can spread across all devices. There is no support for a balancing between the
individual units, like in form of a master-slave system. All loads would have to be controlled and set up separately.
However, it is possible to have a parallel control by the signals on the analog interface, as this one is galvanically
isolated from the rest of the device. There are few general points to consider and adhere:
• Always make parallel connections only with device of same voltage, current and power rating, but at least with
those of the same voltage rating
• Never connect the ground signal of any analog interface with the negative DC input, because it will void the
galvanic isolation. This rule is especially important when going to connect any DC input pole to ground (PE) or
to shift its potential.
• Never connect DC input cables from load device to load device, but instead from every load device directly to
the source, else the total current will exceed the current rating of the DC input clamp