Seg MRD1-T, Manual

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TB MRD1-T 10.01 E 15
4.6 General functions
4.6.1 Event-Recorder
The MRD1 is provided with an event recorder for re-
cording events in a chronological order and then
stores them on a non-volatile memory. Any data entry
has a time stamp so that time of the event can al-
ways be traced back. Data can be called off either
via keys and display or data interfaces.
Important events, such as trippings, are not only re-
corded in the memory but also shown on the display.
Pure informative events are stored in the recorder
only and are not displayed.
More details on calling off events and further infor-
mation on the event recorder can be found in chap-
ter 5.
The system messages are listed in chapter 9.1.
4.6.2 Fault-Recorder
At each tripping of the relays, the fault recorder rec-
ords all measured data and resulting quantities. Any
tripping event is automatically numbered consecu-
tively in the recorder. Additionally to the measured
data the following details are also stored: the cause
for tripping, serial number of the incident as well as
date and time at the instant of tripping.
The
MRD1
is able to record several incidents in a
FIFO memory. The longest stored data is overwritten
when a new incident occurs. Complete data of alto-
gether 10 incidents can always be called off.
More information on storage capacity and calling off
recorder data via keyboard can be found in chapter 5.
4.6.3 Self-test relay
The self-test relay (relay 5) is energized during nor-
mal operation of the
MRD1 and deenergized in the
following events:
•
failure of aux. voltage
•
failure of internal partial power supply
•
processor failure detected by the internal watch-
dog
•
detection of an internal fault by software routines
•
when protection function of the output relays is
decoupled in OFFLINE TEST mode
•
when the default parameterset was loaded and
the device automatically switched in OFFLINE
TEST mode
•
During power on initialisation
•
self-test of the output relays is performed