ABB RELION 620 Series Technical Manual page 780

Section 10
Recording functions
774
• Triggering according to the state change of any or several of the binary channels of
the disturbance recorder. The user can set the level sensitivity with the Level trigger
mode parameter of the corresponding binary channel.
• Triggering on limit violations of the analog channels of the disturbance recorder (high
and low limit)
• Manual triggering via the Trig recording parameter (LHMI or communication)
• Periodic triggering.
Regardless of the triggering type, each recording generates events through state changes
of the Recording started, Recording made and Recording stored status parameters. The
Recording stored parameter indicates that the recording has been stored to the non-
volatile memory. In addition, every analog channel and binary channel of the disturbance
recorder has its own Channel triggered parameter. Manual trigger has the Manual
triggering parameter and periodic trigger has the Periodic triggering parameter.
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 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.
1MAC504801-IB E
620 series ANSI
Technical Manual