5-16
Outputs
The meter has two types of output. The SØ type is designed to switch up to 24VDC and
24mA. The output is isolated from all other circuits, except for other inputs or outputs
on the same terminal block. If the shared circuit is an active input, there is also a
connection to the RS232 or RS485 port ground.
One relay output may also be fitted. The relay contacts are rated to 2A, 240VAC with
an inductive load. This output should not be used as a pulsing output for transmitting
energy pulses, as the output contacts are subject to contact bounce and are not rated for
continuous switching. The relay can be turned on indefinitely, and is primarily designed
to switch small loads or drive an external contactor.
For the locations of the outputs see Figure 5-8 and Figure 5-9.
Battery
The battery is used to run the clock during loss of power. It also allows the meter LCD
to be activated while main power is not available.
The meter comes with an optional internal battery. There is no provision for an external
battery at present. The internal battery is a 3.0V, 700mAh Lithium cell. It is connected
during manufacture.
A low battery indicator is displayed on the LCD if the battery is not present or is
depleted – the level this occurs at can be configured. The battery usage life is longer
than 10 years on continuous backup with the 700mAh batteries at 25°C. In normal
operation the battery should last for more than 10 years.
The battery is soldered into the PCB, and is thus not considered to be replaceable.
LCD/Select Button
The LCD is primarily for displaying information from the meter’s registers for meter
readers. It is also useful during installation, configuration, and diagnosing problems. It
has 8 seven-segment digits to display values and 4 seven-segment digits to display
description (Figure 4-13). It has arrows to indicate import and export for active and
reactive energies, indicators for display sets A and B, battery indicator, currency
indicator, connection type indicator for connection through local or remote port and
units and multipliers. The LCD does not have a backlight
•
Figure 5-16 LCD with all segments turned on
5-16 EDMI Atlas Hardware Reference Manual
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