Rockwell Automation 1426 PowerMonitor 5000 Unit - Manual (Page 87)

Rockwell Automation Publication 1426-UM001F-EN-P - November 2013 87
Power Quality Monitoring Chapter 5
Voltage and Current
Imbalance (Category 4.0) The PowerMonitor 5000 includes long-term voltage and current unbalance in its
metering results. The M6 model reports voltage and current imbalance as power
quality events.
Setup
Basic metering setup is required. These configuration parameters are found in the
Configuration.PowerQuality tab:
• IEEE1159_Imbalance_Averaging_Intvl_m - rolling average interval for
Imbalance, default 15 minutes
• IEEE1159_Voltage_Imbalance_Limit_% - percent of voltage imbalance
to report an event, default 3 per cent.
• IEEE1159_Current_Imbalance_Limit_% - percent of current imbalance
to report an event, default 25 per cent
Operation
The M6 model calculates voltage and current imbalance over a rolling average
with a configurable range of 15 minutes (default) to 60 minutes. The rolling
average is updated at a rate of 10 seconds per minute of the specified interval.
When the rolling average value of voltage or current imbalance exceeds the
configured limit an event is recorded in the power quality log.
Status
The Status.Alarms table provides the following tags for monitoring of unbalance
events:
• IEEE1159_Imbalance_Condition_Volts - 1 = unbalance is above the limit
• IEEE1159_Imbalance_Condition_Current - 1 = unbalance is above the
limit