User Manual
Page 15
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
ea1974@elektroautomatik.de
ENS2
2. Installation & commission
2.1 Unpacking and visual check
After every transport, with or without packaging, or before commissioning, the equipment should be visually
inspected for damage and completeness using the delivery note and/or parts list (see section „1.7.5. Scope of
delivery“). An obviously damaged device (e.g. loose parts inside, damage outside) must under no circumstances
be put in operation.
2.2 Installation
2.2.1 Preparation
TheENS2moduleisintendedtobeinstalledin19“cabinetsor19“racks.Duetotheshortdepthofthemodule,
compared to other units in a cabinet/rack, it is recommended to do the necessary wiring before the ENS2 unit is
nallymountedinthecabinet/rack.
Depending on the version of the ENS2 you will only have the modular unit with integrated supervision hardware or
you will have two additional pre-installed and wired contactors for 16 A (model ENS2 10.5kW) resp. 45 A (models
ENS2 30kW), which are intended to be used for direction connection of 1 to 3 energy recovering devices, depend-
ing on the total AC current.
The ENS2 version without installed contactors is intended to control bigger, external contactors for installations of
higher total power. For such an installation, the external contactors are not included in the delivery and have to be
obtainedandinstalledbyalocalelectricianorotherqualiedpersonnel.Thosecontactorsmustmeetthespeci-
cations of the total current of the installation, as well as the requirements of the AIU unit regarding control. Upon
request,wecanobtainandshipsuitablecontactorsforyou.Werecommendtousecontactorsofseries“DILMP”
from manufacturer Eaton, because this series covers a big range of currents.
For the selection of two identical contactors, as they are required for a typical installation according to VDE-AR-N
4105, it applies:
The rated current of a single contactors has to be at least as high as the maximum output current of the energy
recovery device or system.
• The cross section of cables must at minimum meet the requirements for the maximum output
current of a single ELR unit or the entire installation.
• When installing the ENS2 module in a cabinet, along with multiple ELR 9000 or PSB 9000
units, we disadvise to install the module between two of these units
2.2.2 Types of installation
2.2.2.1 Type 1: Without feedback contact
This type of installation uses standard 4-pole contactors. Here the feedback signal is missing, which tells the
supervision unit that the contactors have acted (make or break). The main fuses on L1, L2, L3 in the schematic
below are not part of the AIU unit.
Type 1 is the wiring scheme as already implemented in versions “ENS2 10.5kW” and “ENS2
30kW” (both with contactors).