Seg HighTECH Line, Manual, Page: 24 / 42

24 TD_MRI1_06.05_GB
5.4.3 Fault memory (not for ER/XR types)
When the relay is energized or trips, all fault data are
stored in a non-volatile memory manner. The
MRI1 is
provided with a fault value recorder for max. eight
fault occurrences. In the event of additional trippings
always the oldest data set is written over.
For fault indication not only the trip values are re-
corded but also the status of LEDs. Fault values are in-
dicated when push buttons <-> or <+> are pressed
during normal 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 <->
button 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).
•
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 FLT8, FLT7, ... are al-
ways displayed.When fault recording is indicated
(FLT1 etc), the LEDs flash in compliance with the
stored trip information, i.e. those LEDs which
showed a continuous light when the fault occured
are now blinking blinking to indicate that it is not a
current fault. LEDs which were blinking blinking dur-
ing 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 store, the push button combina-
tion <SELECT/RESET> and <-> has to be pressed
for about 3s. 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>
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>
.
5.5 Reset
Unit
MRI1 has the following three possibilities to reset
thedisplay of the unit as well as the output relay at
jumper position J3=ON.
Manual Reset
•
Pressing the push button <SELECT/RESET> for some
time (about 3 s)
Electrical Reset
•
Through applying auxiliary voltage to C8/D8
Software Reset
•
The software reset has the same effect as the
<SELECT/RESET> push button (see also communica-
tion protocol of RS485 interface).
The display can only be reset when the pickup is not
present anymore (otherwise "TRIP" remains in display).
During resetting of the display the parameters are not
affected.