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Doc # E107706 V1.25 8-1
Chapter
8
Nexus
Time-oof-UUse
8.1:
Introduction
Q
A Time-of-Use (TOU) usage structure takes into account the quantity of energy used and the time at
which it was consumed. The Nexus 1250/1252 TOU function, available with the Communicator
EXT software, is designed to accommodate a variety of programmable rate structures. Nexus TOU
accumulates data based on the time-scheme programmed into the Nexus Monitor.
Q
See the Communicator EXT User Manual for details on programming the Nexus 1250/1252 20 Year
TOU calendar and retrieving TOU data.
8.2:
The
Nexus
TOU
Calendar
Q
A Nexus TOU calendar sets the parameters for TOU data accumulation. You may store up to twenty
calendars in the Nexus 1250/1252 Monitor and an unlimited amount of calendar files on your
computer.
Q
The Nexus TOU calendar profile allows you to assign a programmable usage schedule—eg,
“Weekday,” “Weekend,” “Holiday”—to each day of the calendar year. You may create up to 16
different TOU schedules.
Q
Each TOU schedule divides the 24-hour day into fifteen-minute intervals from 00:00:00 to 23:59:59.
You may apply one of eight different programmable registers—eg “Peak,” “Off Peak,” “Shoulder
Peak”— to each fifteen-minute interval.
Q
The Nexus 1250/1252 Monitor stores:
• accumulations on a seasonal basis, up to four seasons per year;
• accumulations on a monthly basis.
Q
Seasonal and monthly accumulations may span one year into the next. Each season and month is
defined by a programmable start/billing date, which is also the end-date of the prior season or month.
• A season ends at midnight of the day before the start of the next season.
• A month ends at midnight of the month’s billing day.
Q
If the year ends and there is no new calendar, TOU accumulations will stop. If a calendar is present
for the following year, TOU accumulations continue until the next monthly bill date or next
start-of-season is reached. Accumulation can span into the following year.
Q
If no following year is present, the last accumulation for the year will end on 12:31:23:59:59.