Rockwell Automation 1426 PowerMonitor 5000 Unit - Manual (Page 89)

Rockwell Automation Publication 1426-UM001F-EN-P - November 2013 89
Power Quality Monitoring Chapter 5
Related Functions
• Harmonic Analysis
• Power Quality Log
Power Frequency Variations
(Category 7.0) The PowerMonitor 5000 M6 model detects and reports short-term power
frequency variations in excess of configured limits.
Setup
Basic metering setup is required. These configuration parameters are found in the
Configuration.PowerQuality tab:
• IEEE1159_PowerFrequency_Averaging_Intvl_s - rolling average interval
for power frequency , range = 1 (default)
… 10 seconds
• IEEE1159_PowerFrequency_Limit_Hz - power frequency variation alarm
threshold, range = 0.1 (default)
… 0.2 Hz
• IEEE1159_PowerFrequency_Hysteresis_Hz -power frequency hysteresis,
range = 0.01
… 0.05 Hz, default = 0.02 Hz
Operation
The M6 model measures frequency variation over the specified rolling average
interval and annunciates if the value exceed the specified threshold. The rolling
average updates once per second. The hysteresis parameter is taken into account
when the alarm condition is released.
Status
This status bit annunciates an over limit condition and remains asserted until the
parameter is under the threshold less hysteresis. A value of 1 indicates over limit.
It is found in the Status.Alarms tab:
• IEEE1159_PowerFrequency_Condition
Related Functions
• Basic Metering
• Power Quality Log