Sel 551 - Page 210

B.4
SEL-551 Relay Instruction Manual Date Code 20110408
Firmware Upgrade Instructions
EPROM Firmware Upgrades
If the relay front-panel display is blank, the EPROM may not be seated
properly.
Step 1. Turn relay power off.
Step 2. Disassemble the relay (following Step 7 through Step 9 on
page B.2) and verify the EPROM is seated into its socket.
Step 3. Verify proper orientation.
Step 4. If the EPROM is seated properly and the relay will not power
up, remove the EPROM and inspect it for bent pins.
Step 5. If EPROM pins are bent, contact the SEL factory for a
replacement.
If the relay front panel displays a
CR RAM or EEPROM FAILURE message, reload
the relay settings with the procedure below.
Step 1. Set your communications software settings to 2400 baud,
8 data bits, 1 stop bit.
Step 2. Enter Access Level 2 by issuing the ACC and 2AC commands.
Step 3. If the relay prompts for passwords, enter your Level 1 and
Level 2 passwords.
Step 4. Issue the R_S command to restore the factory default settings
in the relay. The relay will reboot with the factory default
settings.
Step 5. Enter Access Level 2.
Step 6. Verify the calibration settings by issuing the SHO C command.
Step 7. If the settings do not match the settings recorded in Step 2 on
page B.2, reissue the settings with the SET C command.
Step 8. Set the Relay, Logic, SER, and Text settings with each of the
following commands: SET, SET L, SET P, SET R, SET T.
Step 9. Set the relay passwords via the PAS command.
Step 10. Execute the STATUS command to verify all relay self-test
parameters are within tolerance.
Step 11. Apply current signals to the relay.
Step 12. Issue the METER command.
Step 13. Verify the current signals are correct.
Step 14. Issue the TRIGGER and EVENT commands.
Step 15. Verify the current signals are correct in the EVENT report.
The relay is now ready for your commissioning procedure.
Step 16. With relay communications still established at Access Level 2,
execute the SHO C command and review displayed data.
Step 17. If data are identical to previously recorded data of Step 2 on
page B.2, you can execute the QUIT command. The relay is
ready for your commissioning procedure.
Step 18. If, however, any channel gains are different, you must reenter
the previously recorded values by executing the SET C
command (similar to relay settings procedure).