User Manual

Page 30
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
[e-mail]
PSB 9000 2.5 kW Series
2.3.4.5 Protecting the electrical installation when using energy recovering devices
A PSB 9000 device recovers energy and feeds it back into the local power grid. The generated current adds to
the grid current (see schematic below) and this can lead to an overload of the existing installation. Considering
any two outlets, no matter of what kind they are, there is usually no extra fusing installed. In case of a defect in
the AC part (i.e. short-circuit) of any consumer device or if there are multiple devices connected which could take
ahigherpower,thetotalcurrentcouldowacrosswireswhicharenotlaidoutforthishighercurrent.Itcouldlead
todamageorevenreinthewiresorconnectionpoints.
In order to avoid damages and accidents, the existing installation concept must be taken into regard before installing
such recovering devices. Schematic depiction with 1 recovering device and consumers:
PSB 9000 2.5 kW
<16 A
16 A
Gri d
Con sumer 2Con sumer 2
Con sumer 1Con sumer 1
up to 3 2 A
When running a higher number of recovering, i. e. energy backfeeding units on the same leg of the installation,
the total currents per phase increases accordingly.