TB MRI(K)3-C 03.02 E
13
4.3.11
AR information inputs
By means of the information inputs the
MRIK3-C
de-
cides whether and when automatic reclosing may take
place. The functions are assigned via the function as-
signment of the digital inputs as far as they are re-
quired. (refer to chapter 5.11.5)
If one of the three CB position indicators described in
the following is activated, it must also be used be-
cause otherwise no correct function indication is pos-
sible.
CR = "CB ready" signal (e.g. motor switch or spring
power storage)
With this function the CB ready message is signalled.
CI = "CB feedback CB – ON"
With this function the CB position ON is signalled.
Signal = 1 = CB is switched on.
CO = "CB feedback CB – OFF
With this function the CB position OFF is signalled.
Signal = 1 = CB is switched off.
Note
If both functions are assigned to one digital input, a
CB ON position is only recognised if 1 is recognised
via the CI function and 0 via the CO function. For the
OFF position both signals must indicate a negative
signal. All other position indications lead to a CB fault
signal. This is visually indicated by the flashing CB
LED. (refer to chapter 4.7.11)
AR blocked
With this function an AR can be blocked at any time.
If the function has been set, the LED 0
←
1.
SY= SY = Synchronisation signal
This function permits an extension of the dead times tD.
If this function has been activated, there is a waiting
time of 150 s for the synchronisation signal after the
dead times have expired. If the input has not been set
after this period has expired, the
MRIK3-C
stops the
AR cycle. The display shows "S/E?". If the digital input
is activated during this period, the ON signal is set
without delay.
4.4
Functional sequence
4.4.1 Switching on
MRIK3-C
Is the C.B. to be supervised in OFF position while
“switching ON” the
MRIK3-C
, the unit changes into
"inactive" status when applying the auxiliary voltage.
The LED "CB" on the front plate remains dark. The unit
is not ready for auto reclosing. If, however, the C.B. is
in “ON” position when applying the auxiliary voltage,
the unit changes into "reclaim time"-status and remains
blocked during this period (from 1 s to 300 s adjust-
able).
This is indicated at the unit by LED t
R
. After expiration
of the reclaim time the unit changes to "ready" status
and is then ready for auto reclosing. LED "CB" signal-
izes this status.
In case unit
MRIK3-C
is in "blocked" status before aux-
iliary voltage failure occurred, this condition remains
also after recurrence of auxiliary voltage.
The LED CB shows the position of the C.B.
4.4.2 Circuit breaker manual closing
If the circuit breaker is closed manually to a faultless
line, first the unit remains blocked during the reclaim
time (adjustable 1 - 300 s) and then changes to
"ready" status. If the circuit breaker is closed manually
to a faulty line (e.g. short circuit), no AR follows. Unit
MRIK3-C
remains in "inactive" status after protection
tripping. By switching the circuit breaker on manually it
is possible to choose whether the CB is to switch off
with or without delay action in case of connection to a
faulty line. Setting is done separately for each protec-
tion stage. (refer to chapter 5.5.4; 5.5.8; 5.5.14 und
5.5.18)
4.4.3 Circuit breaker manual open
When switching off the circuit breaker manually the
unit changes at once without time delay from "ready"
status into "inactive" status. Auto reclosing is not possi-
ble. The LED CB emit green light.
