K.2
SEL-311C Relay Instruction Manual Date Code 20060320
Unsolicited Fast SER Protocol
Make Sequential Events Recorder (SER) Settings With Care
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 four state
changes per minute can be made for a 25-year relay service life.
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