2.31
Date Code 20171021 Instruction Manual SEL-421 Relay
Installation
Connection
Step 2. To replace the screw-terminal connector, confirm that you have the
correct connector and push the connector firmly onto the circuit
board receptacle.
Step 3. Reattach the two screws at each end of the block.
Changing Screw-Terminal Connector Keying
You can rotate a screw-terminal connector so that the connector wire dress posi-
tion is the reverse of the factory-installed position (for example, wires entering
the relay panel from below instead of from above). In addition, you can move
similar function screw-terminal connectors to other locations on the rear panel.
To move these connectors to other locations, you must change the screw-terminal
connector keying.
Inserts in the circuit board receptacles key the receptacles for only one screw-ter-
minal connector in one orientation. Each screw-terminal connector has a missing
web into which the key fits (see Figure 2.34).
If you want to move a screw-terminal connector to another circuit board recepta-
cle or reverse the connector orientation, you must rearrange the receptacle keys to
match the screw-terminal connector block. Use long-nosed pliers to move the
keys.
Figure 2.35 shows the factory-default key positions.
Figure 2.34 Screw-Terminal Connector Keying
Webs Removed for Keying
(Receptacle Keys Fit Here)
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