2.8
SEL-751 Relay Instruction Manual Date Code 20170927
Installation
I/O Configuration
Voltage/Arc-Flash
Detection Inputs Card
(2 AVI/4 AFDI)
MOT…x70x… Supported only in Slot E of the SEL-751, this card has 300
Vac synchronism-check voltage input (VS), station dc battery monitor input
(VBAT), and four fiber-optic transmit and receive inputs (AF1–AF4).
MOT…xL0x… Supported only in Slot E of the SEL-751, this card has 8 V
LEA synchronism-check voltage input (VS), station dc battery monitor input
(VBAT), and four fiber-optic transmit and receive inputs (AF1–AF4).
The terminal designations for both MOT…x70x… and …xL0x… are shown
in Table 2 . 6.
Eight Arc-Flash
Detection Inputs
(8 AFDI)
MOT…x77x… Supported only in Slot E of the SEL-751 relay, this card has
eight arc-flash fiber-optic transmit and receive inputs (AF1–AF8). Table 2.7
shows the terminal designations.
Table 2.6 Voltage/Arc-Flash Detection Inputs (2 AVI/4 AFDI) Card Terminal
Designations
Side-Panel
Connections Label
Te r m i na l
Number
Description
E01 VS, synchronism-check voltage input
E02 NS, common connection for synchronism-check volt-
age input
E03 VBAT+ station battery (positive) voltage input
E04 VBAT– station battery (negative) voltage input
E05 AF1 Channel TX and RX Inputs
E06 AF2 Channel TX and RX Inputs
E07 AF3 Channel TX and RX Inputs
E08 AF4 Channel TX and RX Inputs
E02
E03
E04
E01
E06
E07
E08
E05
TX RX
AF 1
AF2
AF3
AF4
VS
NS
VBAT+
VBAT-
Table 2.7 Eight Arc-Flash Detection Inputs (8 AFDI) Card Terminal
Designations
Side-Panel
Connections Label
Ter m inal
Number
Description
E01 AF1 Channel TX and RX Inputs
E02 AF2 Channel TX and RX Inputs
E03 AF3 Channel TX and RX Inputs
E04 AF4 Channel TX and RX Inputs
E05 AF5 Channel TX and RX Inputs
E06 AF6 Channel TX and RX Inputs
E07 AF7 Channel TX and RX Inputs
E08 AF8 Channel TX and RX Inputs
TX RX
01
02
03
04
AF 1
AF2
AF3
AF4
05 AF5
06 AF6
07 AF7
08 AF8
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