Rockwell Automation Allen-Bradley PowerMonitor 5000 Unit - Page 106

106 Rockwell Automation Publication 1426-UM001J-EN-P - August 2019
Chapter 5 Power Quality Monitoring
WSB is disabled by default. If WSB is disabled, the unit neither sends nor
receives WSB messages. If WSB is enabled, and PTP is enabled and
synchronized, the unit broadcasts a WSB start message when an internal
triggering event begins and broadcast a WSB end message when the event is
finished. When a unit receives a WSB message through the selected UDP port,
the unit starts recording a waveform that is aligned with the WSB start message
timestamp, ending the waveform recording when the WSB end message is
received from the originator. If the WSB end message is lost, the recording ends
when 3600 cycles have been recorded.
If the PTP clock is not synchronized (IsSynchronized value = 0), WSB messages
are not broadcast or acted upon if received.
Waveform Capture Application Considerations
The PowerMonitor 5000 unit captures one waveform record at a time. There is a
possibility that multiple triggering event can occur in a short time. The starting
point of a waveform capture is determined by the first triggering event and the
defined pre-event cycles. If fewer cycles of data are available, then the first
available cycle is the starting point.
If multiple triggering event occurs during a waveform capture, the capture
duration extends to include the duration of the event that ends latest, plus the
post-trigger cycles. A waveform record that includes multiple triggering event is
referenced in all power quality log records of the triggering events.
Pre-event or post-event cycle settings that are changed during a waveform capture
do not take effect until the next capture. Any change to
Configuration.Metering_Basic immediately ends a waveform capture that is in
process.
In the unlikely event that the PowerMonitor 5000 unit resources are overstressed
so that the unit is unable to write a waveform record to non-volatile memory in a
timely fashion, the in-process waveform record ends with the latest cycle that is
captured in RAM.