CET PMC-53A User Manual

CET Electric Technology
47
4.6 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-53A 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-53A supports two TOU schedules, which can be switched at a pre-defined
time. Each TOU schedule supports:
 Up to 12 seasons
 90 Holidays or Alternate Days
 20 Daily Profiles, each with 12 Periods in 15-minute interval
 8 Tariffs
Instead of using the TOU schedule to switch between Tariffs, the PMC-53A supports Tariff switching
based on the status of DI1 to DI3 in Firmware V1.00.03 or later.
The 3 Digital Inputs (DI1, DI2 and DI3) represent 3 binary digits where Tariff 1=000, Tariff 2=001, Tariff
3= 010, …Tariff 7=110 and Tariff 8=111 where DI1 represents the least significant digit and DI3
represents the most significant digit. As soon as DI1, DI2 and/or DI3 are configured as Tariff Switches,
the current TOU Tariff will be determined by the status of the DIs, and the TOU Schedule will be ignored.
The DI1 Function setup register must first be programmed as a Tariff Switch before configuring DI2 and
DI3 with the same function. In other words, if DI1 is configured as a Digital Input or Energy Pulse
Counter, and DI2 is configured as a Tariff Switch, the TOU will continue to function based on the TOU
Schedule. The number of Tariffs supported depends on how many DIs are programmed as a Tariff Switch
as indicated in the following table.
Tariff
DI Function
DI1 = Tariff Switch
DI2 & DI1 = Tariff Switch
DI3, DI2 & DI1 = Tariff Switch
T1
DI1 (0=T1)
DI2 + DI1 (00=T1)
DI3 + DI2 + DI1 (000=T1)
T2
DI1 (1=T2)
DI2 + DI1 (01=T2)
DI3 + DI2 + DI1 (001=T2)
T3
Not Available
DI2 + DI1 (10=T3)
DI3 + DI2 + DI1 (010=T3)
T4
Not Available
DI2 + DI1 (11=T4)
DI3 + DI2 + DI1 (011=T4)
T5
Not Available
Not Available
DI3 + DI2 + DI1 (100=T5)
T6
Not Available
Not Available
DI3 + DI2 + DI1 (101=T6)
T7
Not Available
Not Available
DI3 + DI2 + DI1 (110=T7)
T8
Not Available
Not Available
DI3 + DI2 + DI1 (111=T8)
Table 4-14 DIs and the Number of Tariffs Setup
Each TOU schedule has the following setup parameters and can only be programmed via
communications:
Setup Parameters
Definition
Options
Daily Profile #
Specify a daily rate schedule which can be divided into
a maximum of 12 periods in 15-min intervals.
Up to 20 Daily Profiles can be programmed for each
TOU schedule.
1 to 20, 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 12 seasons.
Each season is specified with a Start Date and ends with
the next season’s Start Date.
1 to 12, starts 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 90.
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 and
Alternate Days

CET PMC-53A Specifications

General

Brand	CET
Model	PMC-53A
Category	Measuring Instruments
Language	English