Chapter 4
Installation
Page 16 of 20
Product Description ENS31
Version: A.02
Issue: 20.09.2005
4.2 Electrical
connections
4.2.1 Basic
configuration
The switching elements of the automatic isolating device (e.g. contactors)
are not enclosed with the unit and must be brought by the installation
technician. The technician decides on the switching elements most suit-
able.
Danger
The installation technician must ensure that the power generator is
only connected to the mains via the two switching elements assigned to
the ENS. Risk of accident!
The ENS31 must be protected by pre-fuses in the mains feed circuit (min.
6 A, max. 25 A). Observe the circuit diagram.
4.2.2
Demands of the switching elements
Two contactors with positively driven auxiliary contacts are required for
mains disconnection. The acknowledgement contacts must be connected
in the correct sequence (refer to circuit diagram).
The contactors must be designed for the nominal output of the current
inverter or the system at AC3. The decisive factor for dimensioning is the
phase with the highest load.
