ABB REF 542plus, Operator'S Manual, Page: 117 / 134

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22. Appendix D: Self Supervision
The REF 542plus feeder terminal is provided with an extensive self-supervision
system. The self-supervision system handles configuration and run-time fault
situations and informs, if possible, the user of faults via the HMI and SPA event.
REF 542plus is a programmable device. The configuration is built by the
configuration tool REF542CONF and is composed by the following files:
*
FUPLA (functions sequence)
*
WIRE (functions connection)
*
LCU (HMI display configuration)
*
COM (communication configuration)
REF 542plus is a scalable system. Optional modules can be used according to
project requirements. The following list provides a definition of the terminology
used when defining the state of an optional module:
*
"Installed" indicates that the module is physically inserted in the REF 542plus
housing.
*
"Configured" indicates that the module has been configured in REF542CONF by
a REF 542plus engineer.
*
"Detected" indicates that the REF 542plus start-up procedure has made a
successful detection check of the module.
Software supervision
Software faults require different kinds of handling and these can be modelled by
defining a level that identifies the fault
’
s critical nature:
*
Level 1
Level 1 faults are irrecoverable fatal errors. After fault detection, the system is
not able to guarantee safe execution of the protection and control functions. The
irrecoverable fault forces REF 542plus to stop any activities and it can only be
restarted after a power-switch cycle (power off/on) or after a configuration
download (if possible).
*
Level 2
Level 2 faults are recoverable fatal errors. They are similar to level 1 faults
except that REF 542plus, instead of stopping any activities, resets and therefore
automatically restarts and signals the reset cause.
*
Level 3
Level 3 faults are errors that do not affect safe execution of the protection and
control functions. In general, they are handled by signalling the fault via an HMI
error message and a SPA event.
Multifunction Protection and Switchgear Control Unit
Operator's manual
REF 542plus REF 542plus
1MRS755869