WattMaster WCC II - Manual (Page 98)

Section 3: Screen Descriptions
WCC II Operator’s Guide
Operator Interfaces 3-66
ANALOG GLOBAL - INTEGRAL
MODE
The integral mode can be used to either determine the average
value of a measured variable using a “sliding window” effect or the
straight average for a given time period. The integral may also be
used to add data readings together to obtain an accumulated total.
SLIDING WINDOW
Assume that we want to know the
average kW demand of a building over
a 30 minute time period. The ECC/WCC
II system will take a kW reading at
programmed time intervals; for example,
1 reading every three minutes. The value
of the analog global will be the average
kW for the 10 most recent readings. To
understand this mode better, think of
the data as being in a “window” which
moves along the time axis and has the 10
most recent kW readings in it. The value
of the analog global is the average of the
kW values that are in the window. As
the next kW reading becomes available,
the oldest kW reading in the window drops off and is no longer
included in the data set which is used to determine the value of the
global analog.
Notes: