Woodward
Manual MRIK3-C EN
22
DOK-TD-MRIK3-C Rev. A
The LED tF lights up red. A tripping timer (set at 0.2 s) is started when the mains protection tripping
command takes place before expiration of the set fault time. (C.B. must be tripped within this time).
The "start conditions not fulfilled" is evaluated and the MRIK3-C is locked for the duration of the re-
claim time when there is a time difference between mains protection-energized and tripping, which
is larger than the set "fault time". The LED tF flashes red. If the OFF-signal of the C.B. appears be-
fore expiration of the tripping timer, it is evaluated as "start condition fulfilled" and the unit changes
over to "cycle" status. The LED tF extinguishes. During the switch-off procedure of the circuit
breaker the MRIK3-C waits for feedback from the C.B. This feedback must come within 0.2 s. If the
OFF-signal does not appear, however, before expiration of the tripping timer, it will be evaluated as
"start condition not fulfilled" and the unit changes to „inactive“ status. The LED CB flashes and the
Display shows „CB??“. Tripping timer: Time from the beginning of the trip command until receiving
of the C.B. check-back signal.
5.4.5 Unsuccessful reclosing
After the start condition has been fulfilled the unit changes to "starting" status. Now the dead time
tD is started. The corresponding LED flashes.
Unit MRIK3-C can be programmed for reclosing of one to four times. For each reclosing a dead
time has to be set (t
D1
to t
D4
). When the dead time has expired and also the other reclosing condi-
tions have been fulfilled, the reclosing command is given to the circuit breaker. The reclosing condi-
tions are the responsibility of the synchronisation command if the function is configured via the digi-
tal inputs. The CB must be ready and in switched-off status. The reclosing command remains ei-
ther as long as the ON-signal from the circuit breaker appears or the close-impuls-timer (t
CL
) has
expired.
The LED t
CL
lights up for the duration of the close impulse. When the CB-ON message occurs, the
LED t
CL
extinguishes. After expiration of the ON impulse timer the LED t
CI
starts flashing and the
display shows "CB??"
In the last case a failure of the circuit breaker is subjected. With the beginning of the reclosing
command the reclaim timer is started. When a new “OFF-signal” of the circuit breaker appears
within the reclaim time and after the last permissible AR, an unsuccessful reclosing will be de-
tected.
The LED 0
I lights up red and the display shows „OPEN“. Then the unit quits the "cycle" status
and changes to the "inactive" status. Simultaneously a relay can be activated which indicates un-
successful auto reclosing.
5.4.6 Successful
reclosing
If there is no “OFF-signal” of the circuit breaker and no protection tripping within the reclaim time a
successful reclosing will be detected.
During the reclaim time the display shows „CLOS“ and the LED 0
←
1 lights up green.
The unit now quits the "cycle" status, changes over into the "ready" status and is ready for the next
reclosing. The LED AR extinguishes and the CB LED lights up. The display shows
MRIK3
.
5.4.7 Repeated
reclosing
Is the MRIK3-C programmed for more than single reclosing a further dead time is started after a
new “OFF-signal” from the circuit breaker has appeared. After expiration of this dead time a new
reclosing command follows.
