CET Electric Technology
49
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-E supports Tariff switching
based on the status of DI1 to DI3.
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, 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 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 & 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 4-15 TOU Setup Parameters
For each of the 8 Tariff Rates, the PMC-53A-E provides the following information:
Energy: kWh Import/Export, kvarh Import/Export, kVAh for Per-Phase and Total
Peak Demand: kW/kvar/kVA of This Month (Since Last Reset) and Last Month (Before Last Reset).
TOU data is available through the Front Panel (excluding Peak Demand for Last Month) and
communications.
4.7 Communications
4.7.1 SNTP
SNTP (Simple Network Time Protocol) can be used to synchronize the PMC-53A-E's clock through the
connected Ethernet port providing that the network has been properly configured for the PMC-53A-E
to connect to a SNTP Server, wherever it may reside. The programming of the SNTP setup parameters
