Liberty 100 Smart Electricity Meter Technical Reference Manual
● ‘No credit’ alert if the credit level in the meter’s account reaches or passes below zero credit threshold.
● ‘Supply disconnect’ alert if Emergency Credit is not enabled and the cut-off grace period expires.
● ‘Low Emergency Credit’ alert if Emergency Credit level in the meter reaches or passes below the
configured low Emergency Credit threshold.
● ‘Emergency Credit exhausted’ alert if there is no Emergency Credit left in the meter.
● ‘Grace period’ alert at the start of the grace period in Friendly Credit and non-Friendly Credit.
Users can mute audible alert by pressing key ‘B’ on the meter keypad or appropriate button on the IHD. Account
related audible alerts are suppressed during the configured quiet period (e.g. at night).
5.10 Supply Voltage Quality Monitoring
Liberty 100 supports monitoring, logging and profiling of the power supply voltage.
The meter measures the average RMS voltage over a defined monitoring period which is configurable in 1, 2, 3,
4, 5, 6, 10, 12, 15, 20 or 30 minutes via an authenticated command.
Average RMS voltage profiling and monitoring:
The meter logs the average voltage at the end of the monitoring period and compares it with the preconfigured
Over and Under Voltage thresholds. If the average voltage is above the Over Voltage threshold then it is logged
as an Over Voltage event and if the average voltage is less than Under Voltage threshold then it is logged as an
Under Voltage event. The meter maintains a counter for Over Voltage and Under Voltage event occurrence.
The counter can be reset by using an authenticated command. When the existing monitoring period for voltage
profile is changed the meter automatically clears old profile data.
The meter is able to detect and record occurrence of the following voltage related events if they persist longer
than the configured monitoring period:
• Excessive Over Voltage when the RMS voltage exceeds the extreme Over Voltage threshold.
• Voltage Swell when the RMS voltage exceeds the Voltage Swell threshold.
• Excessive Under Voltage when the RMS voltage is below the extreme Under Voltage threshold.
• Voltage Sag when the RMS voltage is below the Voltage Sag threshold.
Note: The meter logs the voltage profile as ‘0x-FFFF’ during power off, which signifies invalid or no data.
5.11 Ambient Power Threshold Status
The meter compares the active import power against configured thresholds and displays the load as detailed
below:
Active import power Load displayed on pressing key
‘0’ in Prepay and Credit mode
Less than or equal to low medium power threshold
Higher than the low medium power threshold and equal to or less than
the medium high power threshold
Medium
Higher than the medium high power threshold
The power thresholds are configurable using an authenticated command.
To Next Page
Loading...
