TB MRIK3 12.00 E
7
3.1.6
Fault recorder
The
MRIK3
has a fault value recorder which records the
measured analog values as instantaneous values.
The instantaneous values
i
L1
, i
L2
, i
L3
, i
E
, (i
Ue
)*,
are scanned at a raster of 1.25 ms (at 50 Hz) and
1.041 ms (at 60 Hz) and saved in a cyclic buffer. It is
possible to store 1 - 8 fault occurences with a total re-
cording time of 16 s (with 50 Hz) and 13.33 s (with
60 Hz) per channel. (see chapter 5.5.1)
Storage division
Independent of the recording time, the entire storage
capacity can be divided into several cases of distur-
bance with a shorter recording time each. In addition,
the deletion behaviour of the fault recorder can be influ-
enced.
No writing over
If 2, 4 or 8 recordings are chosen, the complete mem-
ory is divided into the relevant number of partial seg-
ments. If this max. number of fault event has been ex-
ceeded, the fault recorder block any further recordings
in order to prevent that the stored data are written over.
After the data have been read and deleted, the re-
corder to ready again for further action.
Writing over
If 1, 3 or 7 recordings are chosen, the relevant number
of partial segments is reserved in the complete memory.
If the memory is full, a new recording will always write
over the oldest one.
The memory part of the fault recorder is designed as
circulating storage. In this example 7 fault records can
be stored (written over).
Figure 3.3: Division of the memory into 8 segments, for example
Memory space 6 to 4 is occupied.
Memory space 5 is currently being written in
Since memory spaces 6, 7 and 8 are occupied, this
example shows that the memory has been assigned
more than eight recordings. This means that No. 6 is
the oldest fault recording and No. 4 the most recent
one.
trigger occurence
recording duration
Tpre
[s]
Figure 3.4: Basic set-up of the fault recorder
Each memory segment has a specified storage time
which permits setting of a time prior to the trigger event.
Via the interface RS485 the data can be read and
processed by means of a PC with HTL/PL-Soft4. The
data is graphically edited and displayed. Binary tracks
are recorded as well, e.g. activation and trip.
