Liberty 100 Smart Electricity Meter Technical Reference Manual
3.1.5 Metrology Seal
Figure 7: Metrology seals in Liberty 100
3.2 Power Supply
3.2.1 Switch Mode Power Supply
Mains supply provides power to the meters peripherals, its main controller circuit, switch control and the hub. In
the absence of mains supply the hub has optional backup power supply capacitor to support a supply loss ‘last
gasp’ message.
Voltage: 230 V AC (Vnominal)
Operating range of power supply: +30% to -40% of V
nominal
Peak power capability for communication module: 5.6 W (4 V @ 1.4 A)
Minimum power requirement for communication module: less than 2.5 W (4.2 V @ 500 mA)
Power requirement for meter: 0.9 W (6 V @ 100 mA + 24 V @ 12 mA)
SMPS power rating: 6.5 W
Supply withstand voltage: 460 V for up to 48 hours
3.2.2 Backup Battery
The meter has an internal non-rechargeable battery with an operational life of 20 years to support the following
minimum meter functionality in the absence of mains power:
● Internal clock
● Front cover and terminal cover open detection
● Communication module removal detection
● Maintenance of data held in RAM and NVRAM
The battery will support the meter for two years in absence of mains power.
Note: The battery is not field-replaceable.
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