ABB RER620 Technical Manual page 420

Section 8
Recording functions
414
has its own Channel triggered parameter. Manual trigger has the Manual triggering
parameter and periodic trigger has the Periodic triggering parameter. A state change in
any of these parameters also generates an event that gives individual information about the
reason of the triggering. COMTRADE files provide unambiguous information about the
reason of the triggering, usually only for the binary channels but in some cases also for the
analog channels.
Triggering by binary channels
Input signals for the binary channels of the digital fault 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
digital fault 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 digital
fault 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 the LHMI or via communication by setting the
Trig 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 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
user should first set the Periodic trig time parameter to zero and then to the new value. The
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