12
TB MRIK3 12.00 E
4.4
Description of the status transition
AR-status transition matrix
to
from
inactive
reclaim time
ready
starting
(dead time)
cycle (auto
reclosing)
blocked
inactive
C.B. manual
ON
external
blocking
signal
reclaim time
reclaim time
expired
external
blocking
signal
ready
C.B. OFF
protection ener-
gized and/or
tripped and C.B.-
energy OK
external
blocking
signal
starting
starting
conditions not
fulfilled
start signal
interrupted
start condi-
tions fulfilled
(fault time,
C.B. OFF
etc.)
external
blocking
signal
cycle
AR takes place
external or
internal
blocking
signal
blocked
external
reset of
blocking
Table 4.1:
No status transition possible
From Table 4.1 you can detect what status transitions of
MRIK3
are possible. When the unit is for instance in
"cycle" status (see also para. 4.3) only two status transi-
tions are possible:
•
status transition to "ready"-status when the auto reclos-
ing takes place
•
status transition to "blocked" status by external or inter-
nal blocking.
The grey shaded sections indicate that no transition is
possible.
4.5
Functional sequence
4.5.1
Switching-on
MRIK3
Is the C.B. to be supervised in OFF position while
“switching ON” the
MRIK3
, the unit changes into "inac-
tive" 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 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
is in "blocked" status before auxiliary
voltage failure occurred, this condition remains also af-
ter recurrence of auxiliary voltage.
The LED CB shows the position of the C.B.
