Liberty 100 Smart Electricity Meter Technical Reference Manual
● Credit account events
● Switch operation events
● Security events
● Configuration events
● Communication security events
Event Persistence Time Threshold
Presence of magnetic field 10 Sec --
Removal of magnetic field 10 Sec --
Over voltage* 1 Min >110% of Nominal voltage
Under voltage* 1 Min <90% of Nominal voltage
No voltage /outage 1 Min <80% of Nominal voltage
Switch welding 180 Sec
* The normal voltage is above 95% and below 105% of Nominal voltage.
Table 4: Event Persistence Time and Threshold value
Each event is recorded along with its date and time of occurrence. The meter will retain event data after
decommissioning, un-pairing or change of supply. Event logs are cleared by using an Engineering service
UTRN.
Note: Alerts for event logging and acknowledgment is configured via authorised command.
5.16.1 Hardware Events
Occurrence of hardware events in the meter such as low battery or battery failure, non-volatile memory (NVM)
error, program fault, clock invalid or switch welding or switch failure are logged in the meter’s hardware event
log along with the date and time of their occurrence.
If configured, the meter can send alerts for such events to the HES.
5.16.2 Quality of Supply (QoS) Events
Occurrence of supply loss, supply restoration, under voltage, over voltage, voltage swell and voltage sag events
are recorded in the meter’s QoS event log together with the date and time of their occurrence. The default
minimum threshold voltage is 180 V.
Supply loss and restoration are notified to the HES.
5.16.3 Tamper Events
Liberty 100 can be configured to disconnect the supply when it detects a tamper event and send alerts for such
events to the HES. The meter is programmed to record the following as tamper events together with the date
and time of their occurrence:
● Removal or restoration of the meter main cover, terminal cover or communications module.
● Presence of magnetic field.
● Occurrence or restoration of reverse current flow with load exceeding 20 amps (set as default) and
persisting for at least 60 seconds.
● Inducing or removing a DC magnetic field.
● UTRN attack (i.e. repeated attempt to enter invalid codes).
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