Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, Firmware rev. 3.0 or LATER User Manual
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Publication 1404-UM001F-EN-P - November 2009
Glossary
coil
This is a Modbus mapped location used for reading and writing bit
length data. These bits typically reflect the value of the discrete
outputs. Powermonitor 3000 units do not support this data type.
connected load
The total load which a customer can impose on the electrical system if
everything was connected at one time. Connected loads can be
measured in horsepower, watts or volt-amperes. Some rate schedules
establish a minimum demand charge by imposing a fee per unit of
connected load.
current transformer (CT)
A transformer, intended for measuring or control purposes, designed
to have its primary winding connected in series with a conductor
carrying the current to be measured or controlled. CT’s step down
high currents to lower values which can be used by measuring
instruments.
current transformer ratio
The ratio of primary amperes divided by secondary amperes.
data table
Power monitor data is organized in data tables similar to those found
in an SLC 5/03 Programmable Controller. The detailed data table
definitions are covered in
of the Bulletin 1404
Powermonitor 3000 User Manual.
demand hours
The equivalent number of hours in a month during which the peak
demand is fully utilized. In other words, if energy consumption for the
current month is X kwhr and the peak demand is Y kW, then the
demand hours is equal to X/Y hours. The higher the number of
demand hours, the better the demand leveling situation, and the more
effectively demand is being used.
demand interval
Demand charges are based on peak demand over a utility specified
time interval, not on the instantaneous demand (or connected load) at
any given moment. Typical demand intervals are 15, 20, and 30
minutes.