9.14
SEL-749M Relay Instruction Manual Date Code 20080918
Analyzing Events
Sequential Events Recorder (SER) Report
Sequential Events Recorder (SER) Report
The SER report captures relay element state changes over an extended period.
The SER report data is useful in commissioning tests and root cause analysis
studies. SER information is stored when state changes occur. The report
records the most recent 512 state changes if a relay element is listed in the
SER trigger equations.
SER Triggering
Settings SER1 through SER4 are used to select entries in the SER report. To
capture relay element state changes in the SER report, the relay element name
must be programmed into one of the four SER trigger equations. Each of the
four programmable trigger equations allows entry of as many as 24 relay
elements; the SER report can monitor a total of 96 relay elements.
The relay adds a message to the SER to indicate power up or settings change
conditions:
Relay newly powered up or settings changed
Each entry in the SER includes the SER row number, date, time, element
name, and element state.
Retrieving and
Clearing SER Reports
See SER Command (Sequential Events Recorder Report) on page U.7.21 for
details on the SER command.
Example SER Report
The example SER report in Figure 9.6 includes records of events that occurred
before the beginning of the event summary report in Figure 9.3.
=>SER 10 <Enter>
SEL-749M Date: 12/10/2003 Time: 23:56:14.749
MOTOR RELAY Time Source: internal
FID=SEL-749M-R100-V0-Z001001-D20031210 CID=6FBD
# DATE TIME ELEMENT STATE
10 12/10/2003 22:56:14.629 50P1T Asserted
9 12/10/2003 22:56:14.632 OUT103 Asserted
8 12/10/2003 22:56:14.749 IN101 Asserted
7 12/10/2003 22:58:01.248 27P1T Deasserted
6 12/10/2003 22:58:46.983 27P1T Asserted
5 12/10/2003 22:59:25.471 Relay newly powered up or settings changed
4 12/10/2003 22:59:25.487 STOPPED Asserted
3 12/10/2003 22:59:26.399 27P1T Asserted
2 12/10/2003 22:59:27.428 RTDFLT Asserted
1 12/10/2003 22:59:27.428 WARNING Asserted
Figure 9.6 Example Sequential Events Recorder (SER) Event Report
Table 9.4 Example SER Event Report Explanation
Item # as
shown in
Figure 9.3
Explanation
a A-phase current exceeds 50P1P setting; because 50P1D delay
equals 0.0 seconds, the 50P1T Relay Word bit asserts immediately.
o OUT103 asserts as a result of 50P1T asserting.
i IN101 asserts to indicate the circuit breaker or
contactor has opened; however, because the motor currents
are not cleared, this event indicates a starter fault clearing failure.
Courtesy of NationalSwitchgear.com
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