CET Electric Technology
12
Self-Read
Time
The
Self-Read Time
allows the user to specify the time and day of the
month for the Max. Demand Self-Read operation. The
Self-Read Time
supports three options:
•
A zero value means that the Self-Read will take place at 00:00 of the
first day of each month.
•
A non-zero value means that the Self-Read will take place at a specific
time and day based on the formula: Self-Read Time = Day x 100 + Hour
where 0 ≤ Hour ≤ 23 and 1 ≤ Day ≤ 28. For example, the value 1512
means that the Self-Read will take place at 12:00pm on the 15th day of
each month.
•
A 0xFFFF value will disable the Self-Read operation and replace it with
manual operation. A manual reset will cause the Max. Demand of
This
Month
to be transferred to the Max. Demand of
Last Month
and then
reset. The terms
This Month
and
Last Month
will become
Since Last
Reset
and
Before Last Reset
.
0xFFFF*
Table 4-2 Demand Setup
4.2.4
Harmonics
The PMC-230 provides the U THD and I THD measurements which can be retrieved via the Front Panel or through
communications. There are two methods for calculating the THD:
THDf:
where I
1
represents the amplitude of the fundamental component and I
n
represents the amplitude of the
n
th
harmonic.
THDr:
where the denominator represents the total RMS value and the numerator represents the RMS value of the
harmonics from 2
nd
to 8
th
.
4.3
Logs
4.3.1
Monthly Energy Log
The PMC-230 stores the monthly energy data for the present month and the last 12 months. The
Monthly Energy
Log Self-Read Time
setup parameter allows the user to specify the time and day of the month for the Recorder’s
self-read operation via communications. The Monthly Energy Logs are stored in the meter’s non-volatile memory
and will not suffer any loss in the event of power failure, and they are stored on a First-in-First-out basis where
the newest log will overwrite the oldest one.
The
Monthly Energy Log Self-Read Time
supports two options:
▪
A zero value means that the Self-Read will take place at 00:00 of the first day of each month.
▪
A non-zero value means that the Self-Read will take place at a specific time and day based on the formula:
Energy Self-Read Time = Day x 10
0 + Hour where 0 ≤ Hour ≤ 23 and 1 ≤ Day ≤ 28. For example, the value 1512
means that the Self-Read will take place at 12:00 pm on the 15
th
day of each month.
The Monthly Energy Logs can be reset manually via communications.
The PMC-230 provides the following Energy data for the Present Month and the last 12 months:
Active Energy
kWh Import/Export, Tariff 1 to Tariff 4 kWh Import/Export
Reactive Energy
kvarh Import/Export, Tariff 1 to Tariff 4 kvarh Import/Export
Apparent Energy
kVAh, Tariff 1 to Tariff 4 kVAh
Table 4-3 Energy Measurement for Monthly Energy Log