User's Manual

iCon™ Form 2S and Form 12S Meters Physical Description
Current Sensor
Current is measured using a proprietary air-coupled current transformer. Sensor
data, quantities proportional to the time derivative of the current, is streamed to the
on-board metering chip.
Metering Chip
The iCon™ meter is pre-programmed at the factory for basic residential metering
where 1 Wh equals 2
30
internal energy units. The metering chip measures voltage
using a resistor divider, performs all energy calculations, and outputs billing data to
the Register display board.
The metering chip multiplies instantaneous current and voltage to calculate energy
usage. Energy is read and accumulated into the integer register once every line
cycle. The capacity of the internal register corresponds to 1024 Wh, and the total
energy capacity of the software data register before rollover is approximately ±8.5e6
kWh. Under typical conditions, the internal register has the capacity to store
approximately 80 years of metering data.
The computed watthours is output in a variable frequency pulse waveform and
instantaneous watt-hour. At calibration, the value of each pulse is set as close as
practical to 1.0 watthours per pulse. Each pulse, measured from the rising edge of an
output pulse to the rising edge of the next output pulse, is defined as the meter
energy constant Ke and can be provided as a test output.
Power supply board
This board utilizes the 120/240 VAC mains to supply a regulated voltage to the radio
portion of the MXU 530-E display board.
MXU 530-E display board
The LCD display portion of the board consists of a control processor (register), and
LCD display. The radio portion of the board consists of a spread spectrum direct
sequence radio used to transmit the electric meter data over the air. Modules for
advanced options, such as AMR, are integrated into the display board in the area
below the LCD display. The cable between the Register display board and the
Sensor Module carries SPI, interrupt, and pulse output signals.
Control Processor (register)
The control processor accumulates the active energy register data and converts the
readings to kWh. These active energy readings (or a short-term average of these
readings) are defined as “Instantaneous kWh”. The accumulation of these readings is
defined as “Total kWh”.
NOTE
During the normal operation of the meter, the Total kWh register can be
cleared, but cannot be set to a specific figure. Refer to Error! Reference
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The Total kWh displayed on the LCD, described below, is to the decimal resolution
specified at time of order. The full resolution of the Ke value is maintained in the