7.6
SEL-751A Relay Instruction Manual Date Code 20100129
Communications
Communications Interfaces
NETPORT Selection
The NETPORT setting gives the user the option to select the primary port of
communication in failover or fixed communication modes. Selecting “D” for
this setting disables both the ports there by providing the user the security to
turn off the ports even if the ports are physically connected to the network.
IRIG-B
The SEL-751A has three different physical interfaces, depending on the
model options, to provide demodulated IRIG-B time-code input for time
synchronization. If the relay has multiple options for IRIG-B input, only one
input can be used at a time. Connection diagrams for IRIG-B and settings
selection are in Figure 7.4 through Figure 7.8 in this section.
Option 1: Terminals B01 and B02
This input is available on all models except models with dual Ethernet Port or
Fiber-Optic Ethernet port. Refer to Figure 7.4 for a connection diagram.
B01–B02 IRIG-B input is available on all models except those with fiber-optic
Ethernet or dual-copper Ethernet.
Cannot bring IRIG-B via Port 2 or 3 if B01–B02 input is used.
Set Global setting IRIG TIME SOURCE to TIME_SRC := IRIG1.
Figure 7.4 IRIG-B Input (Relay Terminals B01–B02)
Option 2: Port 3 (EIA-232 Option Only)
Connect to an SEL Communications Processor with SEL Cable C273A to
bring IRIG-B input with the EIA-232 Port. Refer to Figure 7.5 for a
connection diagram.
Refer to Figure 7.6 on how to connect a SEL Time Source (SEL-2401,
SEL-2404, SEL-2407) for IRIG-B Input to Port 3.
Cannot use B01–B02 input or Port 2 if Port 3 is used.
Set Global setting IRIG TIME SOURCE to TIME_SRC := IRIG1.
Figure 7.5 IRIG-B Input Via EIA-232 Port 3 (SEL Communications
Processor as Source)
SEL-2401
or
SEL-2407
SEL-2404
SEL-751A
+ IRIG
– IRIG
SEL Cable
C962
B01
B02
BNC
SEL-2401
or
SEL-2407
SEL-2404
SEL-2030
or
SEL-2032
DB9
Port 3
EIA-232 + IRIG
(or fiber-optic equivalent)
SEL Cable
C273A
(Figure 7.6)
SEL-751A
DB9
To Next Page
Loading...
