User Manual
Page 21
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
3.3.1.2 Relay errors
Arelay/contactorerrorisdisplayedwithaleading“R:”,derivedfromthe“relay”,becausethereareinternalrelays
which switch the bigger, external contactors. These errors are related to both.
List of possible relay errors:
K1>> The voltage on feedback contact K1 (from contactor 1) is too high. This can mean that the feed-
back signal from contactor 1 is permanent, because of connector K1 being directly connected
to phase L1 instead of only after switching the relay on R1R2.
K2>> The voltage on feedback contact K2 (from contactor 2) is too high. This can mean that the feed-
back signal from contactor 2 is permanent, because of connector K2 being directly connected
to phase L1 instead of only after switching the relay on R3R4.
K1? Switching contactor 1 on has failed (voltage in feedback contact K1 too low). Possible cause:
Connector K1 not wired
K2? Switching contactor 2 on has failed (voltage in feedback contact K2 too low). Possible cause:
Connector K2 not wired
K1?? Though contactor 1 has successfully switched on, the feedback voltage on contact K1 is too low
or not present. Possible cause: connector K1 not wired or the connection has been interrupted
(wire interruption)
K2?? Though contactor 2 has successfully switched on, the feedback voltage on contact K2 is too low
or not present. Possible cause: connector K2 not wired or the connection has been interrupted
(wire interruption)
K1<->K2 The feedback signals on K1 and K2 have been interchanged
RELTEST A manual relay test has been triggered. Though this is not an error, this is listed as error in the
error history screen. It will vanish automatically after one minute.
3.3.2 Mains error
Voltage errors
Atrst,itshowsonwhichphase(s)theerrorhasbeendetected:L1,L2,L3,L12,L23orL31.Themeaningofthese
abbreviations is described in section 3.2.Nexttothis,thekindoferrorisspecied:
U< Undervoltage
U> Overvoltage within the 10 minute average
U>> Overvoltage
As a third value, the currently active voltage limit is display, which caused the undervoltage or overvoltage situa-
tion. For example, the screenshot in 3.2 shows an undervoltage error on phase L2.
Frequenzfehler
Possible frequency error:
f< Frequency too low
f> Frequency too high
Similar to voltage errors, the status will display the active frequency limit, which caused the error.
The standard VDE-AR-N4105 partly denes dierent limits for cutting o than for switching on
again. After an error, the display will always indicate the limit which caused the cut-o. It means,
when it is about to switch on, only the switch-on limits matter. An example: the screenshot in
3.2 shows “L2 U< 195.5V”. The limit to cut o at undervoltage is at 184V, but the limit to switch
on again is at 195.5 V and this is what’s displayed here.
Another example: L1 has a voltage of 183V, which causes error ”U<“. Later, the voltage of L1
rises to 254V. In this case, the display would show ”L1 U>>253.0V“. At the rst glance this looks
like a malfunction of the supervision circuit, because the cut-o limit on overvoltage (U>>) is
dened at 264.5V. In fact, everything is correct, because the contactors are currently switched
o and the voltage limit to switch on again is at 253V.