2.10
SEL-751A Relay Instruction Manual Date Code 20100129
Installation
I/O Configuration
Changing Configuration
Following a change in configuration, the relay is always disabled until you
accept the new relay configuration. To change the configuration, perform the
following steps:
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.
!
DANGER
Step 1. De-energize the relay.
Step 2. Remove the eight rear-panel screws, ground screw, plug-in
connectors, and the rear panel.
Step 3. Remove the card from the relay.
Step 4. Insert the new card into the slot.
Step 5. Replace the rear panel, reinstall all screws and connectors, and
energize the unit.
Step 6. If the option card is in the proper slot, the front-panel displays
the following:
STATUS FAIL
XXX Card Failure
If you do not see this message and the ENABLED light is turned
on, the card was inserted into the wrong slot. Begin again at
Step 1.
If you do see this message, then proceed to Step 7.
Step 7. Press the {ESC} pushbutton.
Step 8. Press the {Down Arrow} pushbutton until
STATUS is highlighted.
Step 9. Press the {ENT} pushbutton.
The front-panel displays the following:
Confirm Hardware
Config (Enter)
Step 10. Press the {ENT} pushbutton.
The front-panel displays the following:
Accept Config?
Yes No
Step 11. Select Ye s and press the {ENT} pushbutton.
The front-panel displays the following:
Config Accepted
Enter to Restart
Step 12. Press {ENT}.
The relay restarts and the ENABLED light is turned on to indicate
the option card was installed correctly.
After reconfiguration, the relay updates the part number, except
for the digits shown below. These digits remain unchanged, i.e.,
these digits retain the same character as before the
reconfiguration. Also, a communications card installed in
Slot C will be reflected as an empty slot in the part number. Use
the Status command to view the part number.
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