Woodward
Manual MRM3-2 GB
30
TD_MRM3-2_09.08_GB_Rev.New
Each of the storage segments have a fixed storage time where the time before the trigger event
can be defined.
Via the RS485 interface the data can be read out by means of a PC provided with HTL/PL-Soft4.
The data is graphically edited and represented. Binary tracks are recorded additionally, e.g. activa-
tion and trip.
5.7.2 Number of Fault Recordings
The max. recording time is 16 s at 50 Hz or 13.33 s at 60 Hz.
The max. number of recordings to be stored has to be defined beforehand. There is the choice be-
tween (1)* 2, (3)* 4 and (7)* 8 recordings. Hence the existing memory space can be used as
follows:
(1)* 2 recordings for 8 s at 50 Hz and 6.66 s at 60 Hz.
(3)* 4 recordings for 4 s at 50 Hz and 3.33 s at 60 Hz.
(7)* 8 recordings for 2 s at 50 Hz and 1.66 s at 60 Hz.
* will be overwritten when a new trigger signal occurs.
5.7.3 Adjustment of the Trigger Event
There is the choice between four different trigger events:
P_UP (Pickup)
Data saving begins when a general activation is recognized.
TRIP
Data saving begins when a general trip is recognized.
A_PI (After Pickup)
Data saving begins when the last activation threshold is undershot
(recognizes, for instance, CB failure protection)
TEST
Data saving is activated when push buttons <+> and <-> are pressed
simultaneously
(immediately
upon
pressing the buttons). For recording
time, the mode TEST is displayed.
5.7.4 Pre-Trigger Time (T
vor
)
The time T
pre
defines the period to be saved prior to the trip event. This time can be set between
0.05 s and the max. recording time (2, 4 or 8 s). With push-buttons <+> and <-> the values can be
changed and with <ENTER> they can be saved.