LHMI info
Description
Setting/signal
Normal
(example)
Faulty
(example)
Specification
LNGTHERR
0
1
Status
Incorrect length for the incoming
message
YBIT
0
1
Status
Detected error in an incoming message
at the remote end
LOWLEVEL
0
1
Status
Low signal level in the receive link
1) Approximately 75% RXD is typical if, for example, two master clocks are present in the telecommunication
network.
5.7.2
Detecting communication faults on transceiver 21-216
GUID-A0B9019C-F470-49AA-AD36-56B1FCCB5E01 v1
Some LED indicators on the transceiver 21–216 front panel can be used for communication
fault tracing as shown in Table
Table 32: LED indicators used for detecting communication faults
LED name
Fault indication
RA
Remote Alarm. Red LED indicates that the remote unit has detected a fault condition, and
has set the Yellow Alarm bit in the C37.94 protocol.
LA
Local Alarm. Red LED indicates that transceiver 21-206 has detected a fault condition in
the C37.94 protocol (LOS = Loss Of Signal). The Yellow Alarm bit is set in the outgoing
C37.94 protocol.
If the line differential protection IED shows a communication fail alarm but RA or LA LED is not
lit on transceiver 21-216, communication interruption stems from the telecommunication
network.
5.7.3
Detecting communication faults on transceiver 21-219
GUID-4652FF2A-E9C1-4EEF-A764-8A9B413E9FC3 v1
Some LED indicators on the transceiver 21–219 front panel can be used for communication
fault tracing as shown in Table
Table 33: LED indicators used for detecting communication faults
LED name
Fault indication
LA
Local Alarm. Red LED indicates that transceiver 21-219 has detected a fault condition in the
C37.94 protocol (LOS = Loss Of Signal). The Yellow Alarm bit is set in the outgoing C37.94
protocol.
The red LED is lit when transceiver 21-219 has detected an error. The indication has a
memory function. When the local error is no longer present, the LED blinks until the Reset
button is pressed.
RA
Remote Alarm. Red LED indicates that the remote unit has detected a fault condition, and
has set the Yellow Alarm bit in the C37.94 protocol.
The red LED is lit when the fibre-optic link has detected an error. The indication has a
memory function. When the remote error is no longer present, the LED blinks until the
Reset button is pressed.
If the line differential protection IED shows a communication fail alarm but LA or RA LED is not
lit on transceiver 21-219, communication interruption stems from the telecommunication
network.
Section 5
1MRK 505 382-UEN E
Communication set-up
88
Communication set-up, 670/650 series
Application Guide
© Copyright 2017 ABB. All rights reserved
Summary of Contents for Relion 670 series
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