www.eaton.com IM02601001E 9-9
Functions on the Web Server Pages
Demand
Demand is the power consumption at the receiving terminal averaged over a specic in-
terval of time. The Power Xpert Meter is capable of measuring demand by two methods,
xed () or sliding (Rolling), in intervals of 5 to 60 minutes. These measurements
are performed for the Total Current, kW Forward/Reverse, Net and Sum; kVar Lead/Lag,
Net and Sum and kVA.
Fixed and Sliding Demand
Fixed demand (Total Current), which is an average system current over time can be set
to average current over a range of 5, 15, 30 or 60 minutes. This is known as a xed win-
dow. For example, setting the current demand window to 15 sets the meter to determine
the average current over the past 15 minutes and update the value every 15 minutes.
Power demand can be xed, as described above, or sliding. For example, a 15 minute
average can be obtained that is updated every 5 minutes. To accomplish this, the Sub-
interval is set to 5 minutes and the Total Interval is set to 15.
The Total Interval is the number of minutes in the average calculation. The subin-
terval is the number of minutes between updates.
The Power Xpert Meter starts the demand window on meter startup.
is the magnitude and duration of loads applied in a prescribed time
sequence, including the transient and steady-state characteristics of the individual loads.
The Power Xpert
®
Meter logs demand prole data from the following sources:
kWh/kW: Forward, Reverse, Net, Sum, •
kVAh/kVA - kVARh/kVAR: Received, Delivered, Net, Sum, Total Current in Amperes, •
Phase Currents.
You can set the interval (in lengths of 5 to 60 minutes), sub-interval (used if Sliding is se-
lected), and the demand type (Fixed or Sliding) in the Demand page under Setup. The
interval duration for the monthly prole is 15 minutes, it is not user programmable.
For the Demand , you can select a date from the drop down list and then click
to change the graph to reect data from a different day.
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