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3.3.8
Failure Alarms
When a failure is detected by the automatic supervision, it is followed with an LCD message, LED
indication, external alarm and event recording. Table 3.3.1 summarizes the supervision items and
alarms.
The LCD messages are shown on the "Auto-supervision" screen, which is displayed automatically
when a failure is detected or displayed by pressing the VIEW key. The event record messages are
shown on the "Event record" screen by opening the "Record" sub-menu.
The alarms are retained until the failure is recovered.
The alarms can be disabled collectively by setting the scheme switch [AMF] to "OFF". The setting
is used to block unnecessary alarms during commissioning, test or maintenance.
When the Watchdog Timer detects that the software is not running normally, LCD display and
event recording of the failure may not function normally.
Supervision Item
AC input imbalance monitoring
A/D accuracy check
Memory monitoring
Watchdog Timer
DC supply monitoring
Telecommunication monitoring
Sampling Synchronization
monitoring
Ready signal monitoring
Disconnector monitoring
Id monitoring
Trip circuit supervision
CB state monitoring
CB operating time monitoring
Trip count alarm
∑I
count alarm
y
(1): Diverse messages are provided as expressed with "Err:---" in the table in Section 6.7.2.
(2): The LED is on when the scheme switch [CTSVEN] is set to "ALM" and off when set to "ALM &
(+)
External trip
(−)
A-phase
External trip
B-phase
Figure 3.3.7.2 Binary Input Setting for CB Condition Monitoring
Table 3.3.1 Supervision Items and Alarms
LCD Message
LED
"IN SERVICE"
Err:CT
Err:A/D
Err:SUM, Err:RAM,
Err:BRAM, Err:EEP
----
Err:DC
Err:COM
Err:SYN
Err:RDY
Err:DS
Err:Id
Err:TC
Err:CB
ALM:OP time
ALM:TP COUNT
ALM:∑IY
Binary input setting
GRL150
BIa command
BIa
BIb command
BIb
LED
"ALARM"
On/Off (2)
On
Off
On
Off
On
Off
On
Off
(3)
on
on
on
on
on
on
on
on
on/off (6)
On
On
On
On
On
On
On
On
On
On
On
⎯
⎯
64
6 F 2 S 0 8 2 8
EXT_TRIP-A
1588
By PLC
EXT_TRIP-B
1589
By PLC
External
Alarm record Message
alarm
(4)
Relay fail or Relay fail-A (2)
(4)
Relay fail
(4)
Relay fail
(4)
----
Off
Relay fail-A
(5)
Com. fail
(4)
Sync. fail
(5)
Term. rdy off
(5)
DS fail
(5)
Relay fail or Relay fail-A (2)
Off
Relay fail-A
Off
Relay fail-A
Off
Relay fail-A
Off
Relay fail-A
Off
Relay fail-A
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