12.22
SEL-351A Relay Instruction Manual Date Code 20080213
Standard Event Reports and SER
Sequential Events Recorder (SER) Report
Make Sequential
Events Recorder
(SER) Settings With
Care
The relay triggers a row in the Sequential Events Recorder (SER) event report
for any change of state in any one of the elements listed in the SER1, SER2, or
SER3 trigger settings. Nonvolatile memory is used to store the latest 512 rows
of the SER event report so they can be retained during power loss. The
nonvolatile memory is rated for a finite number of “writes.” Exceeding the
limit can result in an EEPROM self-test failure. An average of one state
change every three minutes can be made for a 25-year relay service life.
Retrieving SER
Reports
The relay saves the latest 512 rows of the SER in nonvolatile memory. Row 1
is the most recently triggered row, and row 512 is the oldest. View the SER
report by date or SER row number as outlined in the examples below.
Example SER Serial
Port Commands
Format
SER If SER is entered with no numbers following it, all available
rows are displayed (up to row number 512). They display with
the oldest row at the beginning (top) of the report and the latest
row (row 1) at the end (bottom) of the report. Chronological
progression through the report is down the page and in descend-
ing row number.
SER 17 If SER is entered with a single number following it (17 in this
example), the first 17 rows are displayed, if they exist. They dis-
play with the oldest row (row 17) at the beginning (top) of the
report and the latest row (row 1) at the end (bottom) of the
report. Chronological progression through the report is down
the page and in descending row number.
SER 10 33 If SER is entered with two numbers following it (10 and 33 in
this example; 10 < 33), all the rows between (and including)
rows 10 and 33 are displayed, if they exist. They display with
the oldest row (row 33) at the beginning (top) of the report and
the latest row (row 10) at the end (bottom) of the report. Chro-
nological progression through the report is down the page and
in descending row number.
SER 47 22 If SER is entered with two numbers following it (47 and 22 in
this example; 47 > 22), all the rows between (and including)
rows 47 and 22 are displayed, if they exist. They display with
the newest row (row 22) at the beginning (top) of the report and
the oldest row (row 47) at the end (bottom) of the report.
Reverse chronological progression through the report is down
the page and in ascending row number.
SER 3/30/97 If SER is entered with one date following it (date 3/30/97 in this
example), all the rows on that date are displayed, if they exist.
They display with the oldest row at the beginning (top) of the
report and the latest row at the end (bottom) of the report, for
the given date. Chronological progression through the report is
down the page and in descending row number.
Courtesy of NationalSwitchgear.com
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