SEL-2890 Instruction Manual Date Code 20210715
Troubleshooting
Troubleshooting Procedures
5.2
Troubleshooting Procedures
Troubleshooting procedures for common problems are listed in Table 5.2. The table
lists each symptom and the possible causes and corresponding diagnosis/solutions.
Relevant SEL-2890 settings are listed in all capitals. See Section 3: Settings and
Commands 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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