Sel SEL-751 User manual

qSELECT Power Supply With I/O (Slot A)
wSELECT Processor and Communications Card (Slot B)
eSELECT I/O Expansion Card (Slot C: see table)
rSELECT I/O Expansion Card (Slot D: see table)
tSELECT I/O Expansion Card (Slot E: see table).
ySELECT 4ACI/3AVIor4ACICard(SlotZ)
uDevice Case
iRear-Panel Mounting Screws
oRear Panel
Refer to the Model Option Table on the SEL website for ordering details Rear-Panel Slot
Card Type A B C D E Z
SELECT PSIO/2 DI/3 DOa●n/a n/a n/a n/a n/a
SELECT CPU/COMan/a ●n/a n/a n/a n/a
SELECT EIA-232/EIA-485 n/a n/a ●n/a n/a n/a
SELECT DeviceNet n/a n/a ●n/a n/a n/a
SELECT 3 DI/4 DO/1 AO (one card per relay) n/a n/a ●●●n/a
SELECT 4 DI/4 DO n/a n/a ●●●n/a
SELECT 4 DI/3 DO (1 Form B, 2 Form C) n/a n/a ●●●n/a
SELECT 8 DI n/a n/a ●●●n/a
SELECT 14 DI n/a n/a ●●●n/a
SELECT 8 DO n/a n/a ●●●n/a
SELECT 8 AI n/a n/a ● ● ●n/a
SELECT 4 AI/4 AO (one card per relay) n/a n/a ● ● ●n/a
SELECT 10 RTD n/a n/a n/a ● n/a n/a
SELECT 2 AVI/4 AFDI (MOT…x70x…) n/a n/a n/a n/a ●n/a
SELECT 2 AVI/4 AFDI (MOT…xL0x…) n/a n/a n/a n/a ●n/a
SELECT 8 AFDI (MOT…x77x…) n/a n/a n/a n/a ●n/a
6
7
8
9
1
2
3
4
5
SEL-751 Card Options

2
The SEL-751 offers flexibility in tailoring I/O to your specific application. The SEL-751 has six rear-panel slots, labeled
as Slots A, B, C, D, E, and Z. Slots A, B, and Zare base unit slots, each associated with a specific function. Optional
digital/analog I/O cards are available for the SEL-751 in Slots C, D, and E. Optional communications cards are available
only for Slot C, an RTD card is available only for Slot D, 1 A/5 A/200 mA CT combinations for voltage/current or
current only cards are available only on Slot Z, and a voltage/arc-flash card is available for Slot E. The previous figure
and table show the slot allocations for the cards.
Because installations differ substantially, the SEL-751 offers a variety of card configurations that provide options for an
array of applications. Choose the combination of option cards most suited for your application.
Dangers, Warnings, and Cautions
Card Installation for Slots C, D, E, and Z
Perform the following procedure to install or replace any one of the cards into Slots C, D, E, or Zof the base unit:
1. Save the settings and event report data before installing the new card in the relay.
2. Remove the power supply voltage qfrom terminals A01+ and A02–, and then remove the ground wire
from the green ground screw.
3. Disconnect all the connection plugs.
4. Remove the eight screws on the rear iand remove the rear cover.
5. Remove the plastic filler plate covering the slot associated with the card being installed.
6. Insert the card in the correct slot.
Make sure the contact fingers on the printed circuit board are bent at an approximate 130-degree angle
relative to the board for proper electromagnetic interference protection.
7. Before reattaching the rear cover, check for and remove any foreign material that may remain inside the
SEL-751 case.
8. Carefully reattach the rear cover.
9. Reinstall the eight screws that secure the rear cover to the case i.
SELECT 4 ACI/3 AVI (MOT…x81/82/83/85/86/87x…) n/a n/a n/a n/a n/a ●
SELECT 4 ACI/3 AVI (MOT…xL1/L2/L3/L5/L6/L7x…) n/a n/a n/a n/a n/a ●
SELECT 4 ACI (MOT…xA1/A2/A3/A5/A6/A7x…) n/a n/a n/a n/a n/a ●
aRefer to the SEL-751 Model Option Table (MOT) for power supply and CPU board variants.
DANGER
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.
WARNING
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.
WARNING
To install an option card, the relay
must be de-energized and then
re-energized. When re-energized,
the relay will reboot. Therefore,
de-energize the protected
equipment before installing the
option card to prevent damage to
the equipment.
CAUTION
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.
Refer to the Model Option Table on the SEL website for ordering details Rear-Panel Slot
Card Type A B C D E Z

3
10. Apply power supply voltage qto terminals A01+ and A02–, and reconnect the ground wire to the green
ground screw.
If you have a two-line display front panel, perform Step 11 through Step 19; if you have a touchscreen
display front panel, proceed to Step 20.
11. If the 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 LED is turned on, the card was inserted in the wrong slot.
Begin again at Step 2.
12. Press the ESC pushbutton.
13. Press the Down Arrow pushbutton until STATUS is highlighted.
14. Press the ENT pushbutton.
The front panel displays the following:
STATUS
Relay Status
15. Press the ENT pushbutton.
The front panel displays the following:
Serial Num
000000000000000000000000
16. Press the ENT pushbutton.
The front panel displays the following:
Confirm Hardware
Config (Enter)
17. Press the ENT pushbutton.
The front panel displays the following:
Accept New Config?
No Yes
18. Select Ye s and press the ENT pushbutton.
The front panel displays the following:
Config Accepted.
Enter to Reboot
19. Press ENT and proceed to Step 22.
20. Wait for the Device Status screen to appear, and then verify the new part number and tap Ye s to confirm
the new configuration.
21. Tap OK on the notification screen to reboot the relay.

4
22. Use the PA RT N O command from Access Level C to enter the exact part number of the relay after the
relay restarts and the ENABLED LED is turned on to indicate the 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. A
communications card (DeviceNet or EIA-232/485) installed in Slot C will be reflected as an empty slot in
the part number. A regular 4 DI/4 DO card and a hybrid 4 DI/4 DO card have the same device ID. When
interchanging these two cards, the part number for the respective slots should be updated manually. Use
the STATUS command to view the part number.
23. Update the side-panel drawing with the drawing sticker provided in the option card kit. If necessary,
replace the rear panel with the one applicable for the card and attach the terminal marking label provided
with the card to the rear-panel cover. Also, contact SEL for an updated product serial number label with
the updated part number.
24. Reconnect all connection plugs, and add any additional wiring/connectors required by the new card.
Slot B CPU Card Replacement
Before replacing the Slot Bcard, do the following:
1. Ensure that the card has the latest firmware from the factory.
2. Review the firmware revision history for the changes that were made; note that new settings added, if any,
might affect existing settings in the relay or its application.
3. Save all the settings and event reports before replacing the card.
4. If the IEC 61850 protocol option was used previously, verify that the IEC 61850 protocol is still
operational after the replacement. If not, reenable it. Refer to Protocol Verification for Relays With
IEC 61850 Option in Appendix B: Firmware Upgrade Instructions of the instruction manual.
Perform the following steps to replace the existing CPU card with a new card.
1. Turn off the power to the relay.
2. Use a ground strap between yourself and the relay.
3. Disconnect the terminal blocks and CT/PT wires.
4. Remove the rear panel.
5. Remove the card from its slot and insert the new card.
6. Attach the rear panel (new if applicable) and reconnect the terminal blocks and CT/PT wires.
7. Apply new side stickers to the relay.
8. Turn on the relay and log in via the terminal emulation software.
9. Issue the STA command and accept the new configuration.
10. From Access Level 2, type CAL to enter Access Level C.
Do not modify any settings other than those listed in this procedure.
The default password for Access Level C is CLARKE.
11. From Access Level C, issue the SET C command.
12. Update the relay serial number and part number to the appropriate values, type END, and then save the
settings.
PART NUM = 751001B5X1X7086020X

5
13. Issue the STA C command to reboot the relay.
14. Issue the STA command to verify that the serial and part numbers of your relay are correct.
Slot A Power Supply Card
If you are replacing the power supply card, change the part number accordingly using the PART NO command from
Access Level C. Install new side stickers on the relay.

6
2011–2018 Schweitzer Engineering Laboratories, Inc. All rights reserved. All trademarks are the property of their respective holders. SEL products appearing in this document may
be covered by U.S. and foreign patents. The information in this document is provided for informational use only and is subject to change without notice.
*PLS751-01* Date Code 20181207