U.2.22
SEL-421 Relay User’s Guide Date Code 20090715
Installation
Jumpers
Step 11. Locate the jumper you want to change.
Jumpers JMP1, JMP2, and JMP3 are located at the rear of the
main board, directly in front of PORT 3, PORT 2, and PORT 1,
respectively (see Figure 2.19).
Step 12. Install or remove the jumper as needed (see Ta bl e 2. 6 for
jumper position descriptions).
Step 13. Reinstall the SEL-421 main board, and reconnect the power,
the interface board, and the analog input board cables.
Step 14. Reconnect the cable removed in Step 7 and reinstall the relay
front-panel cover.
Step 15. Reattach the rear-panel connections.
Step 16. Affix the screw terminal connectors to the appropriate 100-
addresses locations on the rear panel.
Step 17. Reconnect any serial cables that you removed from the EIA-232
PORTS in the disassembly process.
Step 18. Follow your company standard procedure to return the relay to
service.
I/O Interface Board
Jumpers
Jumpers on the I/O interface boards identify the particular I/O board
configuration and I/O board control address. Eight I/O interface boards are
available: INT1, INT2, INT3, INT4, INT5, INT6, INT7, and INT8 (see I/O
Interface Boards on page U.2.12 for more information on these boards). The
jumpers on these I/O interface boards are at the front of each board, as shown
in Figure 2.21, Figure 2.22, Figure 2.23, Figure 2.24, and Figure 2.25.
Courtesy of NationalSwitchgear.com
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