User Manual

Page 14
ENS2
www.elektroautomatik.de
ea1974@elektroautomatik.de
EA Elektro-Automatik GmbH
Helmholtzstr. 31-33 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
1.8.3 Relay blockade
TheitalianstandardCEI0-21requirestostarta”relayblockage“incaseofrelayfailureandiftheAIUisinstalled
withtwocontactors(”Numberofrelays”=2).Ifanyofthecontactorswouldnotbreakcorrectlyafteracut-o󰀨has
been initiated, the AIU would be blocked and could only switch on again after the blockade has been acknowledged
manually, but pushing a button.
The blockage would be even remain after a reset of the AIU. In order to avoid an unintended blockade, the relay
feedback test, which precedes a probable blockade, is only executed 2 s after a mains failure occurred. It means,
mains failures shorter than 2 s do not cause a relay blockade. If a blockade occurs, the LEDs on the front panel
will start to blink alternatingly and the LCD display will be overlaid with:
The actual error is displayed in the bottom row.
K1=RelayonR1R2hasacted,butonK1thereisstillafeedback
in form of voltage
K2=ditto,forrelayonR3R4andterminalK2
After releasing the blockade by pushing the top button, the overlaid display will vanish and the AIU can switch on
again.
1.8.4 The di󰀨erences of the „country data sets“
Theso-called“countrydataset”isageneraltermforasetofparametersderivedfromacountryspecicstandard,
like the german VDE-AR-N4105 or the italian CEI-021. Those two are supported by the ENS2 device, which means
it can be operated in Germany and other european countries, but also in Italy.
By default, the manufacturer has selected following country data set:
VDE-AR-N4105
Dependingontheselection,therearedi󰀨erences:
• Parameter“Numberofrelays”
a. VDE-AR-N-4105: Parameter is set to 2 and can not be changed.
b. CEI-021: Parameter is set to 2 by default, but can be changed to 1 when using an installation with <20kW.
The installation then only runs with one relay/contactor (R1R2, K1).
• Function“Relayblockade”
a. VDE-AR-N-4105: There is no relay blockade.
b. CEI-021: If the installation is running with two relays/contactors, the relay blockade function is activated by
“Numberofrelays”=2.Itwillinitiatearelayblockadeincaseofacontactornotcuttingo󰀨,i.e.breakcor-
rectly (see 1.8.3).
Switching to a country data other than set by factory is possible, but requires a password, which
can be requested from the manufacturer of the ENS2 device.