CET Electric Technology
14
4.4
Time of Use (TOU)
TOU is used for Electricity Pricing that varies depending on the time of day, day of week, and season. The TOU
system allows the user to configure an electricity price schedule inside the PMC-230 and accumulate energy
consumption into different TOU tariffs based on the time of consumption. TOU programming is only supported
through communications.
The TOU feature on PMC-230 supports two TOU schedules, which can be switched at a pre-defined time. Each
TOU schedule supports:
•
Up to 4 Seasons
•
30 Holidays or Alternate Days
•
12 Daily Profiles, each with 8 periods in 15-minute interval
•
4 Tariffs
Each TOU Schedule has the following setup parameters and can only be programmed via communications:
Parameters
Definition
Options
Daily Profile #
Specify a daily rate schedule which can be divided into a
maximum of 8 periods in 15-min intervals.
Up to 12 Daily Profiles can be programmed for each TOU
schedule.
1 to 12, the first period
starts at 00:00 and the
last period ends at 24:00.
Season #
A year can be divided into a maximum of 4 seasons. Each
season is specified with a Start Date and ends with the next
season’s Start Date.
1 to 4, starting from
January 1
st
Alternate Days #
A day can be defined as an Alternate Day, such as May 1
st
. Each
Alternate Day is assigned a Daily Profile.
1 to 30.
Day Types
Specify the day type of the week. Each day of a week can be
assigned a day type such as Weekday1, Weekday2, Weekday3
and Alternate Days. The Alternate Day has the highest priority.
Weekday1, Weekday2,
Weekday3 & Alternate
Days.
Switching Time
Specify when to switch from one TOU schedule to another.
Writing 0xFFFFFFFF
to this parameter disables switching
between TOU schedules.
Format: YYYYMMDDHH
Default=0xFFFFFFFF
Table 4-6 TOU Setup
For each of the 4 Tariffs, the PMC-230 provides the kWh, kvarh Import/Export and kVAh measurement.