CET Electric Technology
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4.2.2 Energy Measurements
The PMC-53A provides Energy parameters for active energy (kWh), reactive energy (kvarh) and
apparent energy (kVAh) with a resolution of 0.1k and a maximum value of ±100,000,000.0. When the
maximum value is reached, the energy registers will automatically roll over to zero. The energy can be
reset manually through the Front Panel or via communications. Further, the energy can be preset to
user defined values via communications.
The PMC-53A provides the following energy measurements:
kWh Import/Export/Net/Total
kWh Import/Export of TOU T1-8
kvarh Import/Export/Net/Total
kvarh Import/Export of TOU T1-8
kvarh of Q1/Q2/Q3/Q4
kVAh Total
kVAh Total of TOU T1-8
Per-Phase Energy
(Phase A/B/C):
kWh Import/Export/Net/Total
kWh Import/Export of TOU T1-8
kvarh Import/Export/Net/Total
kvarh Import/Export of TOU T1-8
kvarh of Q1/Q2/Q3/Q4
Table 4-3 Energy Measurement
4.2.3 Interval Energy Measurements
The PMC-53A provides Interval Energy measurements of kWh Import/Export, kvar Import/Export and
kVAh since Firmware V1.00.03. The Interval Energy measurements represent the amount of energy
consumed during the last completed interval as defined by EN Period. The Interval Energy
Measurements can only be retrieved through communications and are not available on the Front Panel.
The Interval Energy Period (EN Period) setup parameter can be programmed from the Front Panel or
through communications and allows the user to specify the interval for which the real-time energy
consumption should be accumulated. Please note that changing the Interval Energy Period would clear
the present Interval Energy measurements.
4.2.4 Demand Measurements
Demand is defined as the average power consumption over a fixed interval (usually 15 minutes) based
on the sliding window method. The PMC-53A provides Present Demand and Predicted Demand for Ia,
Ib, Ic, kW Total, kvar Total and kVA Total as well as kW Total, kvar Total and kVA Total of TOU Tariff 1 to
8. Only Import Demand is provided for kW Total, kvar total and kVA Total. Predicted Demand is typically
used for pre-alarming and to help users reduce power consumption using a Setpoint to warn that the
Demand limit may be exceeded.
The PMC-53A provides the following setup parameters:
1 to 60 minutes. For example, if the # of Sliding Windows is
set as 1 and the Demand Period is 15, the demand cycle will
be 1×15=15min.
Number of Sliding Windows.
The Self-Read Time allows the user to specify the time and
day of the month for the Peak Demand Self-Read operation.
The Self-Read Time supports three options:
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