U.2.24
SEL-421/SEL-421-1 Relay User’s Guide Date Code 20020501
Installation
Jumpers
Figure 2.17 Major Component Locations
on the SEL-421 Relay INT6 I/O Board.
To confirm the positions of your I/O board jumpers, you can remove the front
panel and inspect the jumper placements visually. Table 2.5 on page 2.25 lists
the four jumper positions for I/O interface boards. Refer to Figure 2.15 on
page 2.22, Figure 2.16 on page 2.23, and Figure 2.17 on page 2.24 for the
locations of these jumpers.
JMP2A
JMP2B
JMP1A
J8
Control Inputs Hybrid Control Outputs Hybrid Control Outputs
JMP1B
6
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