ITRON Centron, Technical Reference Manual

Page: 66 / 100

Operation: C12.19 C1SD, C1ST, and C1SL Versions
56 CENTRON® Meter Technical Reference Guide
Registers
The CENTRON meter can measure up to four energies and ten demands. When the meter is
configured for a TOU calendar, all energies and demands that are selected for measurement
also have the configured TOU rates applied to them, with the exception of previous,
projected, and instantaneous registers. The TOU energy and demand registers are available
for display as well.
Current Season Register
All energy and demand registers selected for the active season are considered current season
registers. If a single rate schedule is applicable year-round, then only current season
registers are used.
Last Season Registers
Last season registers are available when two or more seasons are used during the year. For
every current season register (with the exception of Cumulative and Continuous Cumulative
registers), there is a last season register for the same quantity. Last season registers are
designated
LS in the programming software. Last season registers can be selected for
display in Normal and Alternate Display Lists.
TOU Operation
This section describes TOU operation specific to the meter display. Several TOU indicators
are available on the liquid crystal display (LCD).
Rate Annunciators and Active Rate Indicators
Rate annunciators are available with each demand and energy register. An A, B, C, or D will
be displayed on the far right side of the LCD to indicate the rate period for each quantity
being displayed. The rate annunciator that may be displayed for the Total Rate is
t .
If the rate annunciator is flashing while a demand or energy value is displayed, the
annunciator indicates that it is the current rate in effect. This gives a quick indication that
the register is programmed with the correct TOU schedule and that it is currently set to the
correct time.
Season Change
At the end of a specified season, all last season registers are updated with current season
register data. The meter can be programmed to either delay the season change until a
demand reset occurs, to activate an automatic demand reset at season change, or to change
the season without performing a demand reset. A season change occurs at midnight at the
end of the programmed season change date, or at the first demand reset following the season
change date, depending on how the meter has been programmed. Some utilities program the
season change to occur at the first demand reset following the season change date to make
season changes concurrent with the meter reading cycles.