User's Manual

Operation: C1SD, C1ST, and C1SL Versions
CENTRON Meter Technical Reference Guide 5-23
Power Procedures
Applying Power
Personality Modules are powered directly from line voltage via the board-to-board
connector. These modules are energized when AC power is present. During power
outages, the permanently installed lithium battery runs the clock circuit on C1ST
and C1SL versions. The battery normally lasts for the life of the meter. However, in
the unlikely event of a low battery notification, the battery or Register Module may
need to be replaced.
Battery Life (Load Profile & TOU)
The CENTRON TOU and Load Profile personality modules have a permanently
soldered battery present on their circuit boards. This battery powers the clock
when power is disconnected from the meter. The module program is transferred to
EEPROM for recall when power is restored.
The battery life is longer for the CENTRON TOU and Load Profile modules than
the J5 200 Series electromechanical hybrid meters. The capacity of the new battery
is larger than equivalent older products, and the current consumption is reduced
with new electronics technology.
In the process of determining this factor, battery life calculations are made
assuming worst case conditions for both the battery capacity (at the lowest end of
the manufacturer published initial limit) and the meter current consumption
(assuming all the components are at the maximum side of their published
tolerance).
The CENTRON battery life is illustrated in Figure 5.8.
Do NOT remove the electronics housing while the meter is powered. Line level voltages
are present on the circuit board. Failure to follow this procedure could result in serious
personal injury or death. The warning label should always be visible on the housing.
Meters shipped from the factory unprogrammed or meters removed from the field and given a
3-button reset will not use battery carryover time.