Manual MRIK3-C EN
Woodward
DOK-TD-MRIK3-C Rev. A
21
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 5.7.11)
AR blocked
With this function an AR can be blocked at any time. If the function has been set, the LED 0
1
lights up.
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.
5.4
Functional
sequence
5.4.1
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 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 pe-
riod (from 1 s to 300 s adjustable).
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" signalizes this status.
In case unit MRIK3-C is in "blocked" status before auxiliary voltage failure occurred, this condition
remains also after recurrence of auxiliary voltage.
The LED CB shows the position of the C.B.
5.4.2
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 "inac-
tive" 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 protection stage. (refer to chapter 6.5.4; 6.5.9; 6.5.15 and
6.5.19)
5.4.3 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 possible. The LED CB emit green light.
5.4.4 Starting
AR
When the information "protection energized" and "protection tripping" is applied, the unit changes
from "ready" status to "starting" status. The LED "AR" lights up. The "starting" status begins with
the start of a fault timer (tF from 0.1 s to 2.0 s adjustable).
