3.15.4
Operation principle
The self-supervision operates continuously.
•
Normal micro-processor watchdog function.
•
Checking of digitized measuring signals.
•
Other alarms, for example hardware and time synchronization.
The SELFSUPEVLST function status can be monitored from the LHMI, from the
Event Viewer in PCM600 or from a SMS/SCS system.
Under the Diagnostics menu in the LHMI the present information from the self-
supervision function can be reviewed. The information can be found under
Monitoring/Internal Events
or
Monitoring/IED Status
. The information from the
self-supervision function is also available in the Event Viewer in PCM600.
A self-supervision summary can be obtained by means of the potential free alarm
contact (INTERNAL FAIL) located on the power supply module. This output relay is
activated (no fault) and deactivated (fault) by the Internal Fail signal, see
.
Also the software watchdog timeout and the undervoltage detection of the PSM
deactivates the relay.
IEC09000390-1-en.vsd
Power supply fault
Watchdog
TX overflow
Master resp.
Supply fault
ReBoot I/O
Internal Fail (CPU)
Power supply
module
I/O nodes
CEM
AND
Fault
Fault
Fault
INTERNAL
FAIL
I/O nodes = BIO
xxxx = Inverted signal
IEC09000390 V1 EN
Figure 49:
Hardware self-supervision, potential-free contact
1MRS757256 F
Section 3
Basic functions
PML630/Compact Load-Shedding Solution
93
Technical Manual
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