Woodward
Manual MRI3-ITER GB
10
DOK-TD-MRI3 ITERE Rev.A
3.2.1 Blocking
input
The function for blocking can be parameterized arbitrary. When an auxiliary voltage is connected to
D8/E8 those relay functions will be blocked which were parameterized before (see chapter 5.7.1).
3.2.2 External reset input
See chapter 5.9
3.2.3 Fault
recorder
The MRI3-ITER has a fault value recorder which records the measured analogue values as
instantaneous values. The instantaneous values
i
L1
, i
L2
, i
L3
, i
E
,
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 occurrences with a total recording time of 16 s (with 50 Hz) and
13.33 s (with 60 Hz) per channel.
Storage division
Independent of the recording time, the entire storage capacity can be divided into several cases of
disturbance with a shorter recording time each. In addition, the deletion behavior of the fault
recorder can be influenced.
No writing over
If 2, 4 or 8 recordings are chosen, the complete memory is divided into the relevant number of
partial segments. If this max. number of fault event has been exceeded, 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 recorder 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 com-
plete 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 re-
cords can be stored (written over).
Memory space 6 to 4 is occupied.
Memory space 5 is currently being written in
Figure 3.6: Division of the memory into 8 segments, for exam-ple
Since memory spaces 6, 7 and 8 are occupied, this example shows that the memory has been as-
signed more than eight recordings. This means that No. 6 is the oldest fault recording and No. 4
the most recent one.
