7
7.2 Fault Recorders
73Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
7.2.1.2.3 Logical Trigger
A logical trigger can comprise two to eight single triggers combined by a logical AND.
A maximum of 8 logical triggers can be defined in a SIMEAS R-PMU. In a parameterization
dialog, logical triggers are named Pattern or Logical Group (see chapter 12.12.5).
Time window for logical triggers
The trigger conditions for a logical trigger do not have to be met simultaneously. It is sufficient if
they occur within the parameterized time window (time frame for logical trigger). The first trigger
starts the time frame for logical trigger. If all conditions of a logical trigger are met within this time
window, the recording will be started after this time has elapsed (see figure 7-11). The record is
provided with the trigger time stamp at the end of the time frame for the logical trigger.
Figure 7-11 Recording of a fault record when all conditions of a logical trigger are met during the time frame
Note
All channels used in a/an (active) logical trigger pattern are inactive as single triggers.
Trigger condition 1
Time frame for logical
trigger
Time frame for
logical trigger
Recording time
Prefault time
Trigger condition 2 Trigger condition 1
t
Channel A
Fault record
t
Recording of fault record
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