Heinzinger electronic GmbH
Phone: +49 (0) 8031 2458 0
www.heinzinger.com
Anton-Jakob-Str. 4, 83026 Rosenheim
Fax: + 49 (0) 8031 2458 58
Germany
Page 44
ERS COMPACT
2.3.5.3
Restriction when operating the device with NS protection
With an NS protection installed (also see
2.3.2.3
) there is the specific restriction that the device can only run on
a supply voltage of 400 V (L-L), because the NS protection and its supervision is designed for that voltage and
wouldn’t enable the contactors on 208 V, 380 V or 480 V. The NS protection futhermore requires the N conductor.
2.3.5.4
Installation concept for energy recovering devices
A ERSC 10000 device recovers energy and feeds it back into the local power grid of a company or big electric
plant. The recovered current adds to the grid current (see schematic below) and this can lead to an overload of the
existing electric installation. Considering any two outlets, no matter of what kind they are, there is usually no extra
fusing installed in between. In case of a defect in the AC part (i.e. short-circuit) of any consumer device or when
there are multiple devices connected which could take a higher power, the total current could flow across wires
which are not laid out for this higher current. It could lead to damage or even fire 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(E) 10000
<49 A
63 A
Grid
Consumer 2
Consumer 2
Consumer 1
Consumer 1
up to 112 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.