Sel SEL-421 - Page 78

U.2.18
SEL-421/SEL-421-1 Relay User’s Guide Date Code 20020501
Installation
Jumpers
Figure 2.13 Major Component Locations on the SEL-421 Relay Main Board.
PORT 1 PORT 2 PORT 3
Control Inputs Control Outputs Control Outputs Control Outputs
J20
J22
PORT F
J17
J18
J16
JMP1
JMP2 JMP3
80-Pin PORT 5 Connector
Battery
J19
IRIG-B 1k PPS
A
B
C
D