TB MRI3-ITE(R) 12.00 E
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5.8.4
Fault memory
When the relay is energized or trips, all fault data and
times are stored in a non-volatile memory manner. The
MRI3
is provided with a fault value recorder for max.
eight fault occurrences. In the event of additional trip-
pings 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). 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 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”.
5.9
Reset
Unit
MRI3-ITER
has the following three possibilities to
reset the display of the unit as well as the output relay
at jumper position J3=ON.
Manual Reset
•
Pressing the pushbutton <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> pushbutton (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.
5.9.1
Erasure of fault storage
The fault storage is erased by pressing the key combi-
nation <SELECT/RESET> and <-> for about 3 s. At the
display "Wait" appears.
5.9.2
Reset of the thermal replica register
It is possible to reset the thermal replica
ϑ
to 0%.
•
The thermal replica is reset by long pressing of the
pushbuttons <SELECT/RESET> and <-> (for approx.
3 seconds).
