Operation: CP1SD/T/L Version
56
CENTRON® Polyphase Meter Technical Reference Guide
Recording Duration
The following equation can be used to determine the recording duration of the load profile:
Recording Duration (days) = (M x I x 1024) / (1,440 x [(2 x C + 2) + ((6 x C + 4) / 128)])
M = Memory size in kilobytes
C = Number of channels
I = Interval Length in minutes
The tables below show the recording duration for 144 kilobytes (KB) load profile memory
size.
Recording Duration (in days) for 144 KB of Load Profile Memory
INTERVAL LENGTH (Minutes)
Number of
Channels
1
2
3
4
5
6
10
12
15
20
30
60
1
25 50 75 100 125 150 251 301 376 502
753
1506
2
16 33 50 66 83 100 167 200 250 334
501
1003
3
12 25 37 50 62 75 125 150 187 250
375 751
4
10 20 30 40 50 60 100 120 150 200
300 601
5
8 16 25 33 41 50 83 100 125 166
250 500
6
7 14 21 28 35 42 71 85 107 143
214 429
7
6 12 18 25 31 37 62 75 93 125
187 375
8
5 11 16 22 27 33 55 66 83 111
166 333
Event Log
The D/T/L Register has an Event Log that records historical events that have taken place in
the meter. The events to be logged must be configured via the PC-PRO+ Advanced
programming software. To aid in troubleshooting, Itron recommends enabling all events to
be logged.
In order to have date and time associated with an event, Time-of-Use or Load Profile
is required. A Demand-only D/T/L Register allows for event log recording. However,
in the event of a power outage, the date and time will not be reliable.
The D/T/L Register Event Log is circular in nature, allowing for the capture of the most
recent events in the meter at all times. The CENTRON Polyphase meter is capable of
retaining 420 events prior to wrapping.
