Rockwell Automation 1426 PowerMonitor 5000 Unit - Manual (Page 94)

94 Rockwell Automation Publication 1426-UM001F-EN-P - November 2013
Chapter 5 Power Quality Monitoring
Waveform capture is triggered in three ways:
• Manually, through a command
• Automatically by the power monitor when it detects a sag or swell event
• In response to a waveform synchronization broadcast message
Waveform triggers are ignored when insufficient space remains to store a new
waveform.
Waveform files can be cleared by using the Clear_Waveform command. See
Commands on page 95 .
The waveform voltage source depends on the Metering_Mode parameter value.
For Demo, split-phase, or Wye modes, phase voltage (V-N) is used. For Delta,
line-to-line voltages are used. If the metering mode is changed while a waveform
capture is active, the active capture is stopped and saved.
Manual Waveform Recording on Command
A manually triggered waveform recording has a length of 30 cycles plus the pre-
event and post-event cycles.
Waveform Recording Triggered by Sag or Swell
The length of a waveform recording triggered by a power quality event is equal to
the duration of the event (but no more than to 3600 cycles) plus the pre-event
and post-event cycles.
Network Synchronized Waveform Recording
The PowerMonitor 5000 M6 model can receive and send remote waveform
capture triggers by using Waveform Synchronization Broadcast (WSB) messages
through a UDP port by using native Ethernet communication. The two types of
WSB messages are start waveform and end waveform. Each type of message also
contains a network id (last 3 bytes of the originator's MAC ID), trigger type (sag,
swell, or user command) and timestamp information.
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, it
starts recording a waveform 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.