Carlo Gavazzi PQT-90 - Manual (Page 28)

PQT-90 Instruction manual
Useful info
Data logging duration
58
54
53
PQT-90 Instruction manual
52
Installation
40
Direct connection
CT and VT connection CT connection
❑
3-phase, 3-wire conn.
❑
Single phase connect.
❑
Single-phase connection
3 CT and 3 VT connection
(3-wire system)
■
Data logging operating principle and duration
The data logging duration depends on the number of variables
that you want to log (from 1 to 8), from the selected integration
time (from 1 to 60 minutes) and from the activation, if any, of
the max./min. logging for each time interval. The following
table simplifies the duration of the data logging according to
the selections. The datum logged in the selected time interval
(ti as shown in the graph below) results from the continuous
average of the measured values (samples). The average value
is calculated with an interval of approx. 200 ms between two
subsequent measurements (samples); as a result, the histori-
cal data value will be extremely accurate.
ti ti ti
Average value of
the “n” sample
ti= time interval (programmable from 1 to 60 minutes)
Average value of the
“n+1” sample Average value of the
“n+2” sample
Max “n”
Min “n”
Max “n+1”
Min “n+1”
Max “n+2”
Min “n+2”