Sel 551 - Page 213

B.7
Date Code 20110408 Instruction Manual SEL-551 Relay
Firmware Upgrade Instructions
Flash Firmware Upgrades
Step 22. If the EN LED is extinguished, the relay baud rate has changed
back to the factory default of 2400 baud; go to self-test failure:
CR_RAM and EEPROM, Step 22 Step a.
Self-test failure: CR_RAM and EEPROM
a. Set your communications software settings to 2400
baud, 8 data bits, 1 stop bit.
b. Now enter Access Level 2 by issuing the ACC and 2AC
commands, (the factory default passwords will be in
effect).
c. Issue the Restore Settings (R_S) command to restore
the factory default settings in the relay. This takes about
two minutes, then the EN LED will illuminate.
d. Enter Access Level 2 by issuing the ACC and 2AC
commands, (the factory default passwords will be in
effect).
e. Restore the original settings as necessary with each of
the following commands: SET, SET L, SET P, SET R,
and SET T.
f. Set the relay passwords via the PAS command.
Passwords are case-sensitive, so the lower- and
uppercase letters are treated differently.
g. If there are still any
FAIL codes on the Relay LCD, see
Section 8: Testing and Troubleshooting.
Step 23. Verify the calibration settings by issuing the SHO C command.
Step 24. 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 25. Execute the Status (STA) command to verify that all relay self-
test parameters are within tolerance, and that the relay is
enabled.
Step 26. Apply current signals to the relay.
Step 27. Issue the MET command.
Step 28. Verify that the current and voltage signals are correct.
Step 29. Issue the Trigger (TRI) and Event (EVE) commands.
Step 30. Verify that the current and voltage signals are correct in the
event report.
The relay is now ready for your commissioning procedure.