Sel 787 - Detailed Connections; Wire Size and Power Supply Connections; Main Board and Serial Port Connections; Digital and Analog I;O Card Connections

4
Connections are shown for the SEL-787 with Ethernet, Fiber Optic EIA-232, IRIG-B, EIA-485, 3 DI/4 DO/1 AO Option, 8
DI Option, and Voltage/Current (3 AVI/1 ACI) Option. Refer to the SEL-787 manual for additional details and other
options.
Wire sizes for connections are dictated by the terminal blocks and expected load currents. You may use the following table
as a guide in selecting wire sizes:
Connection Type Minimum Wire Size Maximum Wire Size
Grounding (Earthing) Connection 18 AWG (0.8 mm
2
) 14 AWG (2.1 mm
2
)
Current Connection 16 AWG (1.3 mm
2
) 12 AWG (3.3 mm
2
)
Potential (Voltage) Connection 18 AWG (0.8 mm
2
) 14 AWG (2.1 mm
2
)
Contact I/O 18 AWG (0.8 mm
2
) 14 AWG (2.1 mm
2
)
Other Connection 18 AWG (0.8 mm
2
) 14 AWG (2.1 mm
2
)
Card Slot A: Power Supply Card With 2 DI/3 DO
Step 1. Connect ground terminal GND to a rack frame or switchgear ground for proper safety and performance.
Step 2. Connect appropriate power supply to terminal 01 (+/H) and terminal 02 (–/N). Note that power terminals are
isolated from chassis ground.
Step 3. Connect as many as 2 digital inputs, per application requirements, to optoisolated inputs IN101 (terminals 10
and 11) and IN102 (terminals 11 and 12).
Step 4. Connect the 3 output contacts, per application requirements, to OUT101 (terminals 03 and 04), OUT102
(terminals 05 and 06), and OUT103 (terminals 07, 08, and 09).
Card Slot B: Main Board With Ethernet, Fiber Optic, IRIG-B, and EIA-232
Step 1. Connect communications devices as required to front DB-9 serial Port F (EIA-232), rear Port 3 (EIA-485),
10/100BASE-T Ethernet (RJ-45 connector) Port 1 and fiber-optic (ST
®
connector) serial Port 2.
Step 2. Connect IRIG-B time-code input to terminals 01 (+) and 02 (–).
Card Slot C: 3 Digital Inputs, 4 Digital Outputs, 1 Analog Output Card (3 DI/4 DO/1 AO)
Step 1. Connect additional digital inputs (IN_01, IN_02, IN_03) and outputs (OUT_01, OUT_02, OUT_03, OUT_04),
if required by application, using the connection diagram.
Step 2. Connect the analog (transducer) output AO_01 using terminals 09 and 10.
Connections