2.16
SEL-751 Relay Instruction Manual Date Code 20170927
Installation
I/O Configuration
Slot B CPU Board Replacement
When replacing the Slot B card, please do the following:
1. Ensure that the card has the latest firmware from the factory.
2. Review the firmware revision history for the changes that were
made; note that new settings added, if any, might affect existing
settings in the relay or its application.
3. Save all settings and event reports before replacing the card.
4. If the IEC 61850 protocol option was used previously, verify
that the IEC 61850 protocol is still operational after the
replacement. If not, reenable it. Refer to Protocol Verification for
Relays With IEC 61850 Option in Appendix B: Firmware
Upgrade Instructions.
Perform the following steps to replace the existing CPU board with a new
board:
Step 1. Turn off the power to the relay.
Step 2. Use a ground strap between yourself and the relay.
Step 3. Disconnect the terminal blocks and CT/PT wires.
Step 4. Remove the rear panel.
Step 5. Remove the main board from its slot and insert the new board.
Step 6. Install the new rear panel and reconnect the terminal blocks and
CT/PT wires.
Step 7. Apply new side stickers to the relay.
Step 8. Turn on the relay and log in via terminal emulation software.
Step 9. Issue the STA command and accept the new configuration.
Step 10. From Access Level 2, type CAL to enter the CAL level.
Do not modify any calibration settings other than those listed in
this procedure.
The CAL level default password is CLARKE.
Step 11. From the CAL level, issue the SET C command.
Step 12. Enter the serial number and part number to the appropriate
values, then type END and save the settings.
Step 13. Issue the STA C command to reboot the relay.
Step 14. Issue the STA command to verify that the serial number and
part number of your relay are correct.
Slot A Power Supply Card
If replacing a power supply card, change the part number accordingly by using
the PARTNO command from the 2AC level. Install new side stickers on the
side of the relay.
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