P.2.13
Date Code 20151029 Protection Manual SEL-411L Relay
Installation
Plug-In Boards
Installing Optional I/O Interface Boards
Perform the following steps to expand the capability of the relay with
additional I/O interface boards:
Step 1. Follow your company standard to remove the relay from
service.
Step 2. Disconnect power from the relay.
Step 3. Retain the GND connection, if possible, and ground the
equipment to an ESD mat.
Step 4. Remove the communications cable connected to the front-panel
serial port, if applicable.
Step 5. Loosen the four front-panel screws (they remain attached to the
front panel), and remove the relay front panel.
Step 6. Remove the 34-pin ribbon cable from the front panel by
pushing the extraction ears away from the connector.
Step 7. Disconnect the power, the interface board, and the analog input
board cables from the main board.
Step 8. Confirm proper installation of address jumpers on the interface
board (see Jumpers).
Step 9. Confirm screw terminal connector keying.
SEL supplies three new screw terminal connectors with new
I/O interface boards.
a. Inspect the screw terminal connector receptacles on the
rear of the I/O interface board.
b. Refer to Figure 2.29 for the corresponding key
positions inside the receptacle.
c. If the keys inside the I/O interface board receptacles are
not in the positions indicated in Figure 2.29, grasp the
key edge with long-nosed pliers to remove the key and
reinsert the key in the correct position.
d. Break the webs of the screw terminal connectors in the
position that matches the receptacle key (see
Figure 2.28).
Step 10. Attach the screw terminal connector.
a. Mount the screw terminal connectors to the rear panel
of the relay.
b. Tighten the screw terminal connector mounting screws
to between 9 in-lb. and 18 in-lb. (1.0 Nm to 2.0 Nm).
Step 11. Reinstall the relay main board, and reconnect the power, the
interface board, and the analog input board cables.
Step 12. Reconnect the cable removed in Step 6 and reinstall the relay
front-panel cover.
Step 13. Reconnect any serial cables that you removed from the EIA-232
PORTS in the disassembly process.
Step 14. Apply power.
Step 15. Enter Access Level 2 (see Making Simple Settings Changes on
page P.10.13).
Have only qualified personnel service
this equipment. If you are not
qualified to service this equipment,
you can injure yourself or others, or
cause equipment damage.
Equipment components are sensitive
to electrostatic discharge (ESD).
Undetectable permanent damage can
result if you do not use proper ESD
procedures. Ground yourself, your
work surface, and this equipment
before removing any cover from this
equipment. If your facility is not
equipped to work with these
components, contact SEL about
returning this device and related SEL
equipment for service.
Disconnect or de-energize all external
connections before opening this
device. Contact with hazardous
voltages and currents inside this
device can cause electrical shock
resulting in injury or death.
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