Note: Depending on the factory configuration, the meter may not be fitted with pulse outputs 3 to 6.
Metrology LED indicators
Visible metrology pulses proportional to active and reactive energy consumption are provided via two red LED
indicators. These indicators flash in accordance with the metrological constant marked on the front of the meter
(imp/kWh or imp/kvarh).
The metrology LED outputs comply with IEC 62052-11 and are used for metrological verification and meter
accuracy testing.
6.3. Power supplies
Power for the meter's internal electronics is provided by a three-phase switched-mode PSU, supplied from the
measured distribution-network voltages. To maintain meter accuracy in both 3 and 4 wire configurations, the
power supply can tolerate any of the following network failure conditions:
4 wire systems
• missing one or two phases
• missing neutral or neutral and one phase
• inversion of one phase and neutral
3 wire systems
• missing one phase
The power supply has enough reserve energy to withstand three-phase power outages up to 1 second.
On power-down, the unit unconditionally maintains sufficient energy for all critical data to be saved to non-volatile
memory.
Auxiliary power supply
The meter can be optionally equipped with an Auxiliary Power Supply (APS) which allows the meter to be
powered from an external source as an alternative to the distribution-network. Both APS source and network
voltages can be applied to the meter at the same time and while the APS source is present, no power is drawn
from the network during normal meter operation.
If the APS source is present and the network supply fails the metrology stops operating but metered data can be
read.
The APS accepts an AC voltage input ranging from 48V to 288V. The APS is isolated from the measurements
voltages (2kV of isolation).
Typical AC voltage APS terminal wiring illustrated below:
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