Carlo Gavazzi PQT-90 - Manual (Page 10)

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Logging variables selection and dmd power calculation
This window allows the user to enable the variables to be
logged (Max 8) in the data memory of PQT-90 and the work-
ing mode of this operation.
[1] Select the variables to be logged (Max8) activating the
relevant check boxes.
[2] Select if, in addition to the logging of the average values of the
variables, PQT-90 is required to log also the min and max values in
the time interval.
[3] Select the value of the logging time interval (from 1 to 60 min.)
During the measurement, the instrument takes sam-
ples of the selected variables every 200ms approx; at
the expiry of the set time interval, the instrument cal-
culates the average of the samples and carries out the
data logging. The historical value will therefore be guaranteed
to be highly accurate.
[4] Selects the dmd (W-VA-var-PF) calculation method
between FIXED and FLOATING.
FIXED SELECTION: if a value of 15 minutes is selected, the
PQTSoft Remote
Configuration
Data Logging and relevant duration
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PQTSoft Remote
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Configuration
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instrument calculates the dmd value and updates it every 15 minutes.
FLOATING SELECTION: if for example the value “15 minutes” is
selected, the instrument calculates the dmd value and updates
its value at first after 15 minutes and then every minute generat-
ing a window whose width corresponds to 15 minutes and shifts
by units of 1 minute.
The following diagrams show the two working methods.
FIXED DMD POWER CALCULATION
FLOATING DMD POWER CALCULATION
Where: Pmax is the maximum measured power,
Pc is the contractual power
t1 is the selected average period