7.22
SEL-751A Relay Instruction Manual Date Code 20100129
Communications
SEL ASCII Protocol and Commands
=>>BRE R <Enter>
Reset Breaker Wear (Y,N)? y
Clearing Complete
=>>LAST RESET 02/03/01 05:41:07
See Breaker Monitor on page 5.15 for further details on the breaker monitor.
CEV Command
The SEL-751A provides Compressed ASCII event reports to facilitate event
report storage and display. SEL communications processors and the SEL-5601
Analytic Assistant software take advantage of the Compressed ASCII format.
Use the CHIS command to display Compressed ASCII event history
information. Use the CSUM command to display Compressed ASCII event
summary information. Use the CEVENT (CEV) command to display
Compressed ASCII event reports. See Table C.2 for further information.
Compressed ASCII Event Reports contain all of the Relay Word bits. The
CEV R command gives the raw Compressed ASCII event report.
Additionally, the compressed event report has the arc-flash detector light
measurements.
CLOSE Command (Close Breaker)
The CLO (CLOSE) command asserts Relay Word bit CC for 1/4 cycle when
it is executed. Relay Word bit CC can then be programmed into the CL
SEL
OGIC control equation to assert the CLOSE Relay Word bit, which in turn
asserts an output contact (e.g., OUT102 = CLOSE) to close a circuit breaker
(see Table 4.22 and Figure 4.30 for factory default setting CL and close logic).
To issue the CLO command, enter the following.
=>>CLO <Enter>
Close Breaker (Y,N)? Y <Enter>
=>>
Typing N <Enter> after the above prompt will abort the command.
The CLO command is supervised by the main board Breaker jumper (see
Table 2.13). If the Breaker jumper is not in place (Breaker jumper = OFF), the
relay does not execute the CLO command and responds with the following.
=>>CLO <Enter>
Command Aborted: No BRKR Jumper
=>>
COMMUNICATIONS Command
The COM x command (see Table 7.9) displays communications statistics for
the M
IRRORED BITS communications channels. For more information on
M
IRRORED BITS communications, see Appendix I: MIRRORED BITS
Communications. The summary report includes information on the failure of
ROKA or ROKB. The
Last error field displays the reason for the most
recent channel error, even if the channel was already failed. We define failure
reasons as one of the following error types:
➤ Device disabled
➤ Framing error
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