Functional Overview; Meter Description; Metrological Functions - Landis+Gyr E470 User Manual

Functional Overview

3 Functional Overview
3.1

Meter Description

3.2

Metrological Functions

E470 Tokenless Smart Prepayment Meter
Issue: 1.8
The meter requires a single phase, two wire mains supply with a reference
voltage of 230V, 50Hz. The meter is rated at 10, 15, or 20 – (100) Amps
registering kWh to class B (MID). The meter's internal measurement
coefficient is 1 and therefore does not affect the supply's phase angle.
The meter is fitted with a 100A contactor for the disconnection of supply
operating automatically when prepay credit has expired or by manual
command in the event of a change of tenancy, for instance.
The meter is fitted with a single pole, normally open, voltage free relay
rated at 230V 2A at unity and 0.5pf. This relay is internally controlled by
time-of-use switches and may be used to control an ancillary circuit.
The meter is fitted with a GSM modem and will use SMS messaging to
receive credit transactions, tariff and configuration updates. It may provide
periodic scheduled reads and additionally ad hoc reads of register values
and other data on command.
The meter features energy registers for four rates and one total export
energy register. The meter may be configured to maintain time-of-use
tariffs, block tariffs or complex combinations of the two.
The meter is fitted with a standard IEC1107 optical port for factory and on
site programming as necessary.
Additional features include but are not limited to:
Half Hour Profiling – configurable on/off as required

 Prepayment accounting in £ and €
Cost per hour & usage calculations + display

Tamper reporting

 Display of data with a liquid crystal display (LCD).
The current measurement is based on shunt technology.
The microprocessor receives the measured analog signals (U and I)
through an A/D-converter. It determines the energy direction and calculates
the energy which is subsequently processed in accordance with the meter
constant and fed to the relevant rate register determined by rate control.
The microprocessor also controls the data communication with the display
and serial interface and ensures a safe operation in the event of a voltage
failure.
The entire meter's data is recorded in a Ferro-electric Random Access
Memory (FRAM) under the control of the microprocessor. All kWh registers
are stored in the FRAM and are updated every 1/100th of a kWh. The
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