ABB Relion 670 series - Self supervision with internal event list; Introduction; Principle of operation

4.2 Self supervision with internal event list
4.2.1 Introduction
Self supervision with internal event list function listens and reacts to internal system
events, generated by the different built-in self-supervision elements. The internal
events are saved in an internal event list.
4.2.2 Principle of operation
The self-supervision operates continuously and includes:
• Normal micro-processor watchdog function.
• Checking of digitized measuring signals.
• Other alarms, for example hardware and time synchronization.
The self-supervision function status can be monitored from the local HMI, from the
Event Viewer in PCM600 or from a SMS/SCS system.
Under the Diagnostics menu in the local HMI the present information from the self-
supervision function can be reviewed. The information can be found under Main
menu/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.
A self-supervision summary can be obtained by means of the potential free alarm
contact (INTERNAL FAIL) located on the power supply module. The function of this
output relay is an OR-function between the INT-FAIL signal see figure
22 and a
couple of more severe faults that can occur in the IED, see figure 21
Section 4 1MRK505222-UUS C
Basic IED functions
78
Technical reference manual