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DC Supply monitoring
The secondary voltage level of the built-in DC/DC converter is monitored and checked that the
DC voltage is within a prescribed range.
3.3.3 PLC Data and IEC61850 Mapping Data Monitoring
If there is a failure in PLC data and IEC61850 mapping data, the function may be stopped.
Therefore, the PLC data and IEC61850 mapping data are monitored and an alarm of "PLC stop" or
"MAP stop" is issued if any failure detected.
3.3.4 IEC61850 Communication Monitoring
The sending and receiving functions in the Ethernet LAN communication are monitored. The
receiving function is executed by checking GOOSE message receiving status, and the sending
function is executed by checking Ping response to the other party. If a failure is detected, an alarm
of "GOOSE stop" or "Ping err" is issued.
These functions are disabled by setting the scheme switches [GSECHK] and [PINGCHK].
3.3.5 Failure Alarms
When a failure is detected by the automatic supervision, it is followed with LCD display, LEDs
indication, external alarms 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.
Those alarms are retained until the failure is recovered.
Those 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 fails to run normally, LCD display and event
recording on the failure cannot be expected.
DC supply failure disables the LCD display and event recording on the failure as well.
For the discrimination of the two failures mentioned above, refer to Section 6.7.2.
Table 3.3.1 Supervision Items and Alarms
Supervision Item LCD Message
LED
"IN SERVICE"
LED
"ALARM"
Ext. alarm Event record
Message
AC input
imbalance monitoring
(1) On/Off (2) On (4) CT err
Relay fail
A/D accuracy check A/D err Off On (4) Relay fail
CPU, Memory monitoring (1)
Watchdog Timer ---- Off On (4) ----
DC supply monitoring ---- Off (3) (4) Relay fail
PLC data or IEC61850
mapping data monitoring
PLC stop or
MAP stop
on on (4) Relay fail-A
GOOSE message check GOOSE stop
on on (4) Relay fail-A