2.20
SEL-421 Relay Instruction Manual Date Code 20171021
Installation
Jumpers
Step 16. Reconnect any external cables that you removed from the relay in the
disassembly process.
Step 17. 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 configura-
tion 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 2.13 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 2.20
and Figure 2.21.
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