Sel 751A - I;O Diagram; Figure 2.13 Control I;O Connections-4 AI;4 AO Option in Slot D and Fiber-Optic Port in Slot B; Figure 2.14 Control I;O Connections-Internal RTD Option

2.19
Date Code 20100129 Instruction Manual SEL-751A Relay
Installation
Rear-Panel Connections
I/O Diagram
A more functional representation of two of the control (I/O) connections is
shown in Figure 2.13 and Figure 2.14.
Figure 2.13 Control I/O Connections—4 AI/4 AO Option in Slot D and Fiber-Optic Port in Slot B
Figure 2.14 Control I/O Connections—Internal RTD Option
Fiber-Optic Cable
to SEL-2600 series
+IRIG-B
–IRIG-B
IRIG-B
PS
A01
A02
–/N
+/H
External
Contacts
SEL-751A Relay
RX
D07
+
Up to Four
Analog Outputs
D08
—
B01 B02
IN101
IN102
A10
A11
A12 A07
A08
OUT103
+
D15
—
D16
D02
—
—
D10
D01
+
+
D09
A03
A04
OUT101
A05
A06
OUT102
A09
TX
Up to Four
Analog Inputs
AO401 AO404
AI401 AI404
++
++
PS
A01
A02
–/N
+/H
External
Contacts
SEL-751A Relay
IN101
IN102
A10
A11
A12
+IRIG-B
–IRIG-B
IRIG-B
B01 B02
A07
A08
OUT103
A03
A04
OUT101
A05
A06
OUT102
A09
D03
COMP/
SHLD
D02
—
D01
+
RTD01
D30
COMP/
SHLD
D29
—
D28
+
RTD10
Up to Ten
RTD Inputs
Notes:
➤ The chassis ground connector located on the
rear-panel card Slot A must always be
connected to the local ground mat.
➤ Power supply rating (125–250 Vac/dc or
24–48 Vdc) depends on relay part number.
➤ Optoisolated inputs IN101 and IN102 are
standard and located on the card in Slot A.
➤ All optoisolated inputs are single-rated: 24,
48, 110, 125, 220, or 250 Vac/Vdc. Standard
inputs IN101/102 may have a different
rating than the optional IN401/402/403/404
(not shown).
➤ Output contacts OUT101, OUT102, and
OUT103 are standard and located on the
card in Slot A.
➤ The Analog (transducer) Outputs shown
are located on the optional I/O
Expansion card in Slot D.
➤ The fiber-optic serial port is optional
and is located on the card in Slot B. A
Simplex 62.5/125 µm fiber-optic cable is
required to connect the SEL
OGIC with
an SEL-2600 series RTD Module. This
fiber-optic cable should be 1000 meters
or shorter.