Possible Reasons for the Alarms
Table 4-9
Alarm Relays and Possible Alarm Reasons
Relay
Possible Reason
Comment
GALR
Normal operation interrupted
PU4 measuring point alarm (MAL)
Additional non-urgent alarm
Transmission path faulty, no alternative path
Additional RXALR
Primary and secondary path not available
Additional RXALR and non-
urgent alarm
IFC test operation
OK LED on PU4 green blinking
Module alarm or configuration alarm
OK LED red
RXALR
Guard alarm, transmission path not available, no
alternative path
Additional GALR
Guard alarm, primary and secondary path not avail-
able
Additional GALR and non-
urgent alarm
Time limit for the command output exceeded
The command output is inter-
rupted. The alarm is deacti-
vated when the command
transmission is canceled.
Output of the unblocking impulse (when activated) at
operating mode 3 to 5A
NUALR
Primary path not available but secondary path
existing.
Switchover to the alternative
path
Primary and secondary path not available
Additional GALR and RXALR
Power failure of one power supply in case of redun-
dant power supply
No interrupt as long as the
second power supply is working
LIA signal to noise alarm
Command outputs blocked
(depending on settings)
LID bit error alarm (bit error rate is > 1 x 10
-6
)
Command outputs blocked
(depending on settings)
Switch NU-Relay on GAL is activated in the alarms
control configuration
Additional contact in case of
GALR.
Refer to
This function is not available
when 2 transmission paths are
used.
Time limit for the command input exceeded
The command transmission is
interrupted. The alarm is deacti-
vated when the command
input is canceled.
IP alarm
IP alarm is activated if errors
occur in SNMP, NTP,
WebServer, and DHCP
4.4
Diagnostics and Error Handling
4.4 Possible Reasons for the Alarms
190
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020