I-210+ User Manual 9
Chapter 2 • Product Description
Sensing Devices
Voltage is measured through a high impedance resistive voltage divider network.
Load current is converted to a scaled voltage signal by precision Current
Transformers. The scaled signals are inputs for the analog front-end of the
metering circuitry.
Metering and Reading of Data
The Meter chip contains a fully integrated analog-to-digital converter that samples
the scaled-down current and voltage signals. The meter chip integrates the product
of voltage and current over small intervals and accumulates the energy value in a
register.
The meter chip also contains an 8-bit microcontroller. It reads the accumulated
energy at defined momentary intervals from the meter chip and calculates the
energy consumption to be displayed. It uses non-volatile memory to store the
metered data and critical metering parameters.
Nonvolatile Memory
The I-210+ meter is equipped with 256 bytes of nonvolatile EEPROM memory
device. It is used to store the metered data, calibration parameters, and
configuration constants. Meter data quantities are updated at each power fail event.
Stored data includes error-detection provisions. The non-volatile memory does not
require a battery to retain information when line power is not present.
Power Supply
The I-210+ meter is powered from the AC main voltage of 120 V or 240 V for
single phase ANSI forms 1S, 2S, 3S, and 4S and 100 V, 120 V, or 240 Volt for
polyphase ANSI 12S meter forms. It has an operating range of ±20% of nominal
rating. It is a wide range solid-state switching type power supply; however, the
meter is configured for use at a specific nominal voltage rating.
AMR Interface
The meter has a ten-pin header (2x5 pin connector) that can be used to interface
with various AMR modules. Power and data signals allow an AMR device to
operate and retrieve metering data though this interface. The interface scheme
supports four different data communication methods and must be configured to
match the installed AMR device requirement.
Use of unlisted AMR/AMI modules shall result in voided warranty as Aclara can
no longer guarantee the safety and integrity of the product.
Disconnect Switch
The meter can be equipped with an optional under the cover 200A disconnect
switch in the same form factor.
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