2.14
SEL-751 Relay Instruction Manual Date Code 20170927
Installation
I/O Configuration
Adding Cards to Slots C, D, E, and Z
The SEL-751 Relay can be upgraded by adding as many as three (3) optional
cards.
Installation
Perform the following steps to install any one of these option cards into Slots
C, D, E, or Z of the base unit.
Step 1. Remove the power supply voltage from terminals A01+ and A02–
and remove the ground wire from the green ground screw.
Step 2. Disconnect all the connection plugs.
Step 3. Remove the eight (8) screws on the rear and remove the rear
cover.
Step 4. Remove the plastic filler plate covering the slot associated with
the option card being installed.
Step 5. Insert the option card in the correct slot.
Make sure the contact fingers on the printed circuit board are
bent at an approximate 130° angle relative to the board for
proper electromagnetic interference protection.
Step 6. Before reattaching the rear cover, check for and remove any
foreign material that may remain inside the SEL-751 case.
Step 7. Carefully reattach the rear cover.
Step 8. Reinstall the eight (8) screws that secure the rear cover to the
case.
Step 9. Apply power supply voltage to terminals A01+ and A02– and
reconnect the ground wire to the green ground screw.
Step 10. If the option card is in the proper slot, the front panel displays
the following:
STATUS FAIL
X 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 11.
Step 11. Press the ESC pushbutton.
Step 12. Press the Down Arrow pushbutton until
STATUS is highlighted.
Step 13. Press the ENT pushbutton.
The front panel displays the following:
STATUS
Relay Status
Step 14. Press the ENT pushbutton.
The front panel displays the following:
Serial Num
000000000000000000000000
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