ABB RELION SMU615 Technical Manual page 219

1MRS758407 C
Triggering by binary channels
Input signals for the binary channels of the disturbance recorder can be formed
from any of the digital signals that can be dynamically mapped. A change in the
status of a monitored signal triggers the recorder according to the configuration
and settings. Triggering on the rising edge of a digital input signal means that
the recording sequence starts when the input signal is activated. Correspondingly,
triggering on the falling edge means that the recording sequence starts when the
active input signal resets. It is also possible to trigger from both edges. In addition,
if preferred, the monitored signal can be non-triggering. The trigger setting can be
set individually for each binary channel of the disturbance recorder with the
trigger mode parameter of the corresponding binary channel.
Triggering by analog channels
The trigger level can be set for triggering in a limit violation situation. The user can
set the limit values with the
the corresponding analog channel. Both high level and low level violation triggering
can be active simultaneously for the same analog channel. If the duration of
the limit violation condition exceeds the filter time of approximately 50 ms, the
recorder triggers. In case of a low level limit violation, if the measured value falls
below approximately 0.05 during the filter time, the situation is considered to be
a circuit-breaker operation and therefore, the recorder does not trigger. This is
useful especially in undervoltage situations. The filter time of approximately 50
ms is common to all the analog channel triggers of the disturbance recorder. The
value used for triggering is the calculated peak-to-peak value. Either high or low
analog channel trigger can be disabled by setting the corresponding trigger level
parameter to zero.
Manual triggering
The recorder can be triggered manually via communication by setting the
recording parameter to TRUE.
Periodic triggering
Periodic triggering means that the recorder automatically makes a recording at
certain time intervals. The user can adjust the interval with the
parameter. If the value of the parameter is changed, the new setting takes effect
when the next periodic triggering occurs. Setting the parameter to zero disables the
triggering alternative and the setting becomes valid immediately. If a new non-zero
setting needs to be valid immediately, the user should first set the
time parameter to zero and then to the new value. The user can monitor the time
remaining to the next triggering with the Time to trigger monitored data which
counts downwards.
7.2.2.3 Length of recordings
The user can define the length of a recording with the
length is given as the number of fundamental cycles.
According to the memory available and the number of analog channels used, the
disturbance recorder automatically calculates the remaining amount of recordings
that fit into the available recording memory. The user can see this information with
the Rem. amount of rec monitored data. The fixed memory size allocated for the
recorder can fit in two recordings that are ten seconds long. The recordings contain
SMU615
Technical Manual
High trigger level and Low trigger level parameters of
Measurement functions
Trig
Periodic trig time
Periodic trig
Record length parameter. The
Level
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