Schneider Electric 4000 manual April Data Logs, 101

63230-300-212	Chapter 7—Logging
April 2001	Data Logs

Alarm-Driven Data Log Entries

Organizing Data Log Files

Data Log Storage

The circuit monitor can detect over 100 alarm conditions, including over/ under conditions, digital input changes, phase unbalance conditions, and more. (See Chapter 6—Alarmson page 83 for more information.) Use SMS to assign each alarm condition one or more tasks, including forcing data log entries into one or more data log files.

For example, assume that you’ve defined 14 data log files. Using SMS, you could select an alarm condition such as “Overcurrent Phase A” and set up the circuit monitor to force data log entries into any of the 14 log files each time the alarm condition occurs.

You can organize data log files in many ways. One possible way is to organize log files according to the logging interval. You might also define a log file for entries forced by alarm conditions. For example, you could set up four data log files as follows:

Data Log 5: Log voltage every minute. Make the file large enough to hold 60 entries so that you could look back over the last hour’s voltage readings.

Data Log 6: Log voltage, current, and power hourly for a historical record over a longer period.

Data Log 7: Log energy once every day. Make the file large enough to hold 31 entries so that you could look back over the last month and see daily energy use.

Data Log 8: Report by exception. The report by exception file contains data log entries that are forced by the occurrence of an alarm condition. See the previous section “Alarm-Driven Data Log Entries” for more information.

NOTE: The same data log file can support both scheduled and alarm-driven entries.

Each defined data log file entry stores a date and time and requires some additional overhead. To minimize storage space occupied by dates, times, and file overhead, use a few log files that log many values, as opposed to many log files that store only a few values each.

Consider that storage space is also affected by how many data log files you use (up to 14) and how many registers are logged in each entry (up to 96) for each data log file. See “Memory Allocation” on page 104 for additional storage considerations.

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