Operation, Setup, Status – Rockwell Automation 1426 PowerMonitor 5000 Unit User Manual
Page 80: Related functions
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Rockwell Automation Publication 1426-UM001F-EN-P - November 2013
Chapter 5
Power Quality Monitoring
Operation
The power monitor detects and annunciates a sag when any phase voltage varies
below the sag threshold. The sag indication continues for 90 seconds after the
event is detected.
A swell is indicated when any phase voltage exceeds the swell threshold. The
indication continues until 90 seconds has elapsed after all phase voltages return to
the threshold level.
Sag and swell detection operate on line-to-line voltages in Delta wiring modes,
and on line-to-neutral voltages in Wye and split-phase wiring modes. The 90-
second delay on return to normal provides a more reliable indication of sags and
swells when the status tags are logged at a one-minute interval.
Setup
Only basic metering configuration is required. The default sag and swell
thresholds are set at 90% and 110% of the nominal system voltage.
•
In the M5 model thresholds and hysteresis are fixed.
•
In the M6 model, thresholds and hysteresis can be adjusted.
Power Quality Event Classification (M6 model) on page 81
Status
The
provides the following tags for monitoring of sags
and swells.
•
Sag_Indication_Detected
•
Swell_Indication_Detected
Sags and swells are also recorded in the alarm log with alarm type = 4 and alarm
code = 1 for sag, 2 for swell. In the M6 model, sags and swells and references to
their associated waveform records are recorded also in the Power Quality log.
Related Functions
•
Basic Metering setup
•
Power Quality setup (M6 model)