TB MRIK3 12.00 E
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5.2
Setting procedure
After push button <SELECT/RESET> has been pressed,
always the next measuring value is indicated. Firstly the
operating measuring values are indicated and then the
setting parameters. By pressing the <ENTER> push but-
ton the setting values can directly be called up and
changed.
5.3
Systemparameter
5.3.1
Display of measuring values as
primary quantities (I
prim
phase)
With this parameter it is possible to show the indication
as primary measuring value. For this purpose the pa-
rameter must be set to be equal with the rated primary
CT current. If the parameter is set to "sec", the measur-
ing value is shown as a multiple of the rated secondary
CT current.
Example:
The current transformer used is of 1500/5 A. The flow-
ing current is 1380 A. The parameter is set to 1500 A
and on the display "1380 A" are shown. If the parame-
ter is set to "sec", the value shown on the display is
"0.92" x In.
Note:
The pick-up value is set to a multiple of the rated secon-
dary CT current.
5.3.2
Display of earth current as primary
quantity (I
prim
earth)
The parameter of this function is to be set in the same
way as that described under 5.3.1. If the parameter is
not set to "sec", to relay types
MRI3-X
and
MRI3-XR
it
applies too, that the measuring value is shown as pri-
mary current in ampere. Apart from that the indication
refers to % of I
N
.
5.3.3
Nominal frequency
The adapted FFT-algorithm requires the nominal fre-
quency as a parameter for correct digital sampling and
filtering of the input currents.
By pressing <SELECT> the display shows "f=50" or
"f=60". The desired nominal frequency can be adjusted
by <+> or <-> and then stored with <ENTER>.
5.3.4
Display of the activation storage
(FLSH/NOFL)
If after an activation the existing current drops again be-
low the pickup value, e.g. I>, without a trip has been
initiated, LED I> signals that an activation has occured
by flashing fast. The LED keeps flashing until it is reset
again (push button <RESET>). Flashing can be sup-
pressed when the parameter is set to NOFL.
5.3.5
Parameterswitch/external
triggering of the fault recorder
By means of the parameter-change-over switches it is
possible to activate two different parameter sets. Switch-
ing over of the parameter sets can either be done by
means of software or via the external inputs RESET or
blocking input. Alternatively, the external inputs can be
used for Reset or blocking of the triggering of the fault
recorder.
Software-
parameter
Blocking input
used as
RESET input
used as
SET1
Blocking input
RESET input
SET2
Blocking input
RESET input
B_S2
Parameter switch
RESET input
R_S2
Blocking input
Parameter switch
B_FR
External triggering
of the fault re-
corder
RESET input
R_FR
Blocking input
External triggering
of the fault re-
corder
S2_FR
Parameter switch
External triggering
of the fault re-
corder
With the settings SET1 or SET2 the parameter set is ac-
tivated by software. Terminals C8/D8 and D8/E8 are
then available as external reset input or blocking input.
With the setting B_S2 the blocking input (D8, E8) is
used as parameter-set change-over switch. With the set-
ting R_S2 the reset input (D8, E8) is used as parameter-
set change-over switch. With the setting B_FR the fault
recorder is activated immediately by using the blocking
input. On the front plate the LED FR will then light up for
the duration of the recording. With the setting R_FR the
fault recorder is activated via the reset input. With the
setting S2_FR parameter set 2 can be activated via the
blocking input and/or the fault recorder via the reset in-
put.
The relevant function is then activated by applying the
auxiliary voltage to one of the external inputs.
