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2011–2017 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.
*PLS751-01* Date Code 20170315
Slot B CPU Board Replacement
When replacing the Slot B card, please perform 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 board with a new board:
1. Turn off the power to the relay.
2. Use a ground strap between yourself and relay.
3. Disconnect the terminal blocks and CT/PT wires.
4. Remove the rear panel.
5. Remove the main board from its slot and insert the new board.
6. Install the new rear panel 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 terminal emulation software.
9. Issue the STA command and accept the new configuration.
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.
11. From the CAL level issue the SET C command.
12. Enter the relay serial number and part number to the appropriate values, type END, and then 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 replacing a power supply card, change the part number accordingly, using the PARTNO command from
Access Level 2. Install new side stickers on the relay.
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