SEL-2890 Instruction Manual
Date Code 20210715
Troubleshooting
Troubleshooting Procedures
5.2
Troubleshooting Procedures
Troubleshooting procedures for common problems are listed in
. The table
lists each symptom and the possible causes and corresponding diagnosis/solutions.
Relevant SEL-2890 settings are listed in all capitals. See
for details of the SEL-2890 settings.
Table 5.2
Troubleshooting Procedures
(Sheet 1 of 2)
Possible Cause
Diagnosis/Solution
Link LED does not illuminate.
No power to SEL-2890
Verify that the IED serial port is providing 5 Vdc
power on Pin 1 to the SEL-2890. If not, use cable
C663 or C642 to power the transceiver.
Hub/Switch malfunction
The hub/switch should have power and there should
be flashing LEDs. There should also be a Link LED
associated with each Ethernet port. Verify that the
Link LED on the hub/switch associated with the
SEL-2890 connection is illuminated.
Bad cable
If the hub/switch appears to be functioning properly
and the transceiver has power, then the problem may
be the cable. The crimp ends of the cable can be prob-
lematic. Also, the 10BASE-T Ethernet cable may not
have the proper pinout. Some cables called “cross-
over” cables work in point-to-point connecting Ether-
net devices. These “cross-over” cables should not be
used for connecting an Ethernet device to a
hub/switch.
Tx/Rx LED does not illuminate.
No power to SEL-2890
Verify that the IED serial port is providing 5 Vdc
power on Pin 1 to the
SEL-2890
. If not, use cable
C663 or C642 to power the transceiver.
Hub/Switch malfunction
The port on the switch should have a Link LED and
a Data Transmission LED. If the Tx/Rx LED is
flashing and the corresponding Tx/Rx LED on the
SEL-2890
is not flashing, then there is a problem
with the cable or the
SEL-2890
.
Bad cable
If the hub/switch appears to be functioning properly
and the transceiver has power, then the problem may
be the cable. The crimp ends of the cable can be prob-
lematic. Also, the 10BASE-T Ethernet cable may not
have the proper pinout. Some cables called “cross-
over” cables work in point-to-point connecting Ether-
net devices. These “cross-over” cables cannot be used
for connecting an Ethernet device to a hub/switch.
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