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2011–2019 Schweitzer Engineering Laboratories, Inc. All rights reserved. All trademarks are the property of their respective holders. SEL products appearing in this document may
be covered by U.S. and foreign patents. The information in this document is provided for informational use only and is subject to change without notice.
*PLS00007* Date Code 20190508
Slot B CPU Card Replacement
When replacing the Slot B card, 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 the 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 of the instruction manual.
Perform the following steps to replace the existing CPU card with a new card.
1. Turn off the power to the relay.
2. Use a ground strap between yourself and the relay.
3. Disconnect the terminal blocks and CT/PT wires.
4. Remove the rear panel.
5. Remove the card from its slot and insert the new card.
6. Attach the rear panel (new if applicable) and reconnect the terminal blocks and CT/PT wires.
7. Apply new side stickers to the relay.
8. Turn on the relay and log in via the terminal emulation software.
9. Issue the STA command and accept the new configuration.
10. From Access Level 2, type CAL to enter Access Level C.
Do not modify any settings other than those listed in this procedure.
The default password for Access Level C is CLARKE.
11. From Access Level C, issue the SET C command.
12. Update the relay serial number and part number to the appropriate values, type END, and save the
settings.
13. Issue the STA C command to reboot the relay.
14. Issue the STA command to verify that the serial and part numbers of your relay are correct.
Slot A Power Supply Card
If you are replacing the power supply card, change the part number accordingly using the PART NO command from
Access Level C. Install new side stickers on the relay.
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