Rockwell Automation 9307 FactoryTalk EnergyMetrix - Manual (Page 204)

FactoryTalk EnergyMetrix Software
204
Use the CUSUM Chart
Once you have set up an X-Y trend chart and targeting, the CUSUM chart provides
additional tools to analyze your energy usage. Select the CUSUM tab in the Targeting
view.
The CUSUM chart displays the CUmulative SUm of the deviation between actual and
target dependent variable in successive intervals. The CUSUM chart has a number of
properties that provide tools in analyzing your energy usage.
 When the trend is horizontal or nearly so, it signifies that deviances are equally
balanced around zero, that is, that the monitored process is operating near the current
target.
 An upward trend signifies persistent over-consumption relative to the current target,
while a downward trend indicates cumulative savings.
 Points of inflection (where the slope changes markedly) signifies a change in the
behavior of the monitored process and can point to opportunities for improvement.