ABB Relion Technical Manual page 669

1MRK 502 048-UUS A
Technical manual
Diagnostics/Internal events or Main menu/Diagnostics/IED status/General. The
information from the self-supervision function is also available in the Event Viewer in
PCM600. Both events from the Event list and the internal events are listed in time
consecutive order in the Event Viewer.
A self-supervision summary can be obtained by means of the potential free change-over
alarm contact (INTERNAL FAIL) located on the power supply module. This output
contact is activated (where there is no fault) and deactivated (where there is a fault) by the
Internal Fail signal, see Figure
detection of the PSM will deactivate the contact as well.
Power supply fault Power supply
Watchdog
I/O nodes
TX overflow
Master resp.
Supply fault
ReBoot I/O
Internal Fail (CPU)
I/O nodes = BIO
xxxx = Inverted signal
IEC09000390 V1 EN
Figure 297: Hardware self-supervision, potential-free contact
297. The software watchdog timeout and the undervoltage
Fault
module
Fault
Fault
CEM
Section 17
Basic IED functions
AND
INTERNAL
FAIL
IEC09000390-1-en.vsd
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