Operation: CP1SD/T/L Version
CENTRON® Polyphase Meter Technical Reference Guide
51
Daily Patterns
Each pattern defines the times during the day that rate period A, B, C, or D begins and ends.
Up to 24 rate period changes may be specified for each daily pattern.
Day Types
There are four day types: Weekday, Saturday, Sunday, and Holiday. Each day of the week
is assigned to one of the four day types. Each day type is assigned one of the four daily
patterns when each season is defined. Any of the daily patterns can be used in any
combination with the day types.
Seasonal Schedules
A season is a period of weeks during the year when a particular rate structure is in effect.
The year can be divided into a maximum of eight seasons. The day types with associated
daily patterns can be defined differently for each season. Up to eight season change dates
are specified for each year in the calendar schedule. If multiple seasons are not used, the
TOU schedule contains one year-round season.
Season changes occur at midnight of the season change date (where midnight corresponds to
00:00 hours) or can be designated through programming to occur at the first demand reset
following the season change date.
TOU Registers
The D/T/L Register can measure up to eight 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 Registers
All energy and demand registers selected 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).
