Seg MRIK3, Manual

Page: 28 / 46

28 TB MRIK3 12.00 E
5.9 Fault memory
When the relay is energized or trips, all fault data and
times are stored in a non-volatile memory. The
MRIK3 is
provided with a fault value recorder for max. 8 fault oc-
currences. In the event of additional trippings always
the oldest data set is written over.
For fault indication not only the trip values are recorded
but also the status of LEDs. Fault values are indicated
when push buttons <-> or <+> are pressed during nor-
mal measuring value indication.
•
Normal measuring values are selected by pressing
the <SELECT/RESET> button.
•
When then the <-> button is pressed, the latest fault
data set is shown. By repeated pressing the <-> but-
ton the last but one fault data set is shown etc. For
indication of fault data sets abbreviations FLT1,
FLT2, FLT3, ... are displayed (FLT1 means the latest
fault data set recorded). At the same time the pa-
rameter set active at the occurence is shown.
•
By pressing <SELECT/RESET> the fault measuring
values can be scrolled.
•
By pressing <+> it can be scrolled back to a more
recent fault data set. At first FLT3, FLT2, FLT1 are al-
ways displayed.
•
When fault recording is indicated (FLT1 etc.), the
LEDs flash in compliance with the stored trip informa-
tion, i.e. those LEDs which showed a continuous
light when the fault occured are now blinking to in-
dicate that it is not a current fault. LEDs which were
blinking during trip conditions, (element had picked
up) just briefly flash.
•
If the relay is still in trip condition and not yet reset
(TRIP is still displayed), no measuring values can be
shown.
•
To delete the trip memory, the push button combina-
tion <SELECT/RESET> and <-> has to be pressed
for about 3 s. The display shows 'wait'.
Recorded fault values:
Value displayed Relevant LED
Phase currents L1, L2, L3 in I/In L1, L2, L3
Earth current I
E
in I/I
E
n E
C.B. switching time in s
1)
C.B.
Expired tripping time of I>
in % of t
I>
2)
I>
Expired tripping time of I
E>
in % of t
IE>
2)
I
E>
Time stamp
Date: Y = 99
M = 04
D = 20
!
!
!
time: h = 11
m = 59
s = 13
!
!
!
Table 5.7: Recorded fault values
1)
C.B. switching time:
Time between energizing of the trip output relay
and switching of the C.B. (current < 1 % I
N
)).
2)
Expired tripping time:
Time between pickup and release of the low set
element. This value is only displayed for I> and I
E>
.