24
TB MRM3 07.01 E
5.10.2
Units of the Displayed Measuring
Values-
Indication of the measuring value can be represented in
the display optionally as multiple of the secondary rated
current (x In) or as primary current (A).
Consequently the units displayed are changing, i.e. for:
Phase Current
Indicated as
Range
Unit
Secondary current .000 – 40.0
x In
Primary current
.000 – 999.
k000 – k999
1k00 – 9k99
10k0 – 99k0
100k – 999k
1M00 – 2M00
A
kA*
kA
kA
kA
MA
* for rated transformer current starting at 2kA
Earth Current
Indicated as
Range
Unit
Secondary current .000 – 15.0
x In
Primary earth cur-
rent
.000 – 999.
k000 – k999
1k00 – 9k99
10k0 – 99k0
100k – 999k
1M00 – 2M00
A
kA*
kA
kA
kA
MA
* for rated transformer current starting at 2kA
5.10.3
Indication of the Fault Data
All fault events acquired by the relay are optically indi-
cated on the front cover. For the
MRM3
the four LEDs
(L1, L2, L3, I2; E) and the functional LEDs (
ϑ
>; I
B
>; I<;
I>, I>>, I2> and I
E
>) are provided. Not only fault sig-
nals are put out but also the activated protective function
is indicated. If, for instance, overcurrent occurs, the LEDs
assigned to the respective phases are flashing. LED I>
comes on also at the same time. After elapse of the trip-
ping time the flashing LEDs change to permanent light.
5.10.4
Fault Memory
In case of actuation or tripping of the relay, the fault
values and times are stored in a voltage fail-safe way.
The
MRM3
has a fault value memory covering up to 25
fault events. If this number is exceeded, the eldest data
set is then overwritten.
Besides the tripping values, the LED states are also
saved for fault indication.
Inquiry of the fault memory
When the <-> push-button is pressed during normal
measuring value indication, the fault data is displayed.
FLT1
last fault
FLT2
fault before last
etc.
By pressing <+> the respective fault can be selected.
During fault value indication FLT
•
it can be changed over to another fault data set by
pressing <+> or <->
•
it is displayed, which of the parameter sets was ac-
tive during the event
•
the LEDs are falshing according to the stored pick-up
values/trip information, i.e. LEDs showing a permant
light when the trip occured, start to flash in order to
indicate that is was a past fault condition. Those
LEDs, which were flashing when the trip occured,
(element was actuated) are flashing briefly
•
the individual fault measuring values for the respec-
tive fault can be inquired by pressing
<SELECT/RESET>
If the relay has not been reset after tripping (TRIP is dis-
played), measuring values cannot be indicated.
The fault memory can be cleared by pressing the button
combination <SELECT/RESET> and <-> for about 3s. In
the display „wait“ is shown.
