Triggering Alternatives - ABB Relion SMU615 Technical Manual

Section 7
Measurement functions
7.2.2.2
202

Triggering alternatives

The recording can be triggered by any or several of the following alternatives:
• 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 (communication)
• Periodic triggering.
Regardless of the triggering type, each recording generates the Recording started and
Recording made events. The Recording made event 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.
1MRS758407 B
SMU615
Technical Manual