Rockwell Automation Publication 1426-UM001J-EN-P - August 2019 171
Logging Chapter 6
Power Quality Log
(M6 and M8 model)
The power monitor records power quality events that the unit has detected and
classified into a Power Quality log.
Setup
• Basic metering setup
• Date and time setup
• Logging configuration
The Power_Quality_Log_Mode parameter in the Configuration.Logging tab
determines what happens when the log is full:
• 0 = Stop logging; no more power quality data is logged.
• 1 = Overwrite oldest record; logging continues and oldest events are
deleted.
Operation
A Power Quality log record is composed of the event classification, local and
UTC timestamps, duration of event, minimum sag rms voltage and maximum
swell rms voltage level, and the trip point setting. Time stamps have a resolution
of 1 microsecond. If a sag or swell event has an associated waveform recording,
the Power Quality log entry includes the Association_Timestamp, a date/time
reference to the waveform.
Because the user or software can delete waveform files to make room for more
captures, a situation can occur in which a reference appears in a power quality log
record but the file no longer exists. In this case, the write status table returns ‘Log
File Not Found’ to the user.
The power quality log is 100 records deep.
File Name
The power quality log is named Power_Quality_Log.csv.
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