U.2.17
Date Code 20090715 User’s Guide SEL-421 Relay
Installation
Plug-In Boards
Step 14. Attach the screw terminal connector.
a. Mount the screw terminal connectors to the rear panel
of the SEL-421.
Refer to Figure 2.10 and Figure 2.14 for screw terminal
connector placement.
b. Tighten the screw terminal connector mounting screws
to between 7 in-lb. and 12 in-lb. (0.8 Nm to 1.4 Nm).
Step 15. Reinstall the SEL-421 main board, and reconnect the power,
the interface board, and the analog input board cables.
Step 16. Reconnect the cable removed in Step 6 and reinstall the relay
front-panel cover.
Step 17. Reconnect any serial cables that you removed from the EIA-232
PORTS in the disassembly process.
Step 18. Apply power.
Step 19. Enter Access Level 2 (see Making Simple Settings Changes on
page U.4.13).
Step 20. Issue the STA command and answer Y <Enter> to accept the
new hardware configuration (see STATUS on page R.9.48).
Step 21. Inspect the relay targets to confirm that the relay reads the
added I/O interface board(s).
You can see the new control inputs in the target listings by
using a terminal, the
ACSELERATOR QuickSet
®
SEL-5030
software program, or the front panel.
Step 22. Use a communications terminal to issue the commands TAR
IN201 <Enter> (for the 200-addresses slot) or TAR IN301
<Enter> (for the 300-addresses slot).
Alternatively, from the front panel
MAIN menu, select RELAY
ELEMENTS
, and press the {Down Arrow} pushbutton to go to ROW
101
(for the 200-addresses slot) or ROW 104 (for the 300-
addresses slot).
Step 23. Follow your company standard procedure to return the relay to
service.
Communications Card
You can add communications protocols to the SEL-421 by purchasing the
Ethernet card option. Factory-installed in the rear relay PORT 5, the Ethernet
card provides Ethernet ports for industrial applications that process data traffic
between the SEL-421 and a LAN (local area network).
Courtesy of NationalSwitchgear.com
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