ABB RELION REX640, Техническое руководство, Страница: 1488 / 1960

Triggering by binary channels
The 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, the monitored signal can be non-triggering. The trigger setting can be
set individually for each binary channel of the disturbance recorder with the
Level
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
High trigger level and Low trigger level parameters of
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.
Frequency cannot be used as a trigger to disturbance recorder.
Manual triggering
The recorder can be triggered manually via the LHMI or via communication by
setting the
Trig recording parameter to "Trig".
Periodic triggering
Periodic triggering means that the recorder automatically makes a recording at
certain time intervals. The interval can be adjusted with the
Periodic trig time
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
Periodic trig time parameter should
first be set to zero and then to the new value. The time remaining to the next
triggering can be monitored with the Time to trigger monitored data which counts
downwards.
8.2.3.3 Length of recordings
The recording length can be defined with the
Record length parameter. 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 number of recordings
Measurement functions 1MRS759142 F
1488 REX640
Technical Manual