ABB REF 54 Series Technical Reference Manual page 59

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Technical Reference Manual, General
For more information about the trip circuit supervision function, refer to the
Technical Descriptions of Functions for CMTCS1 and CMTCS2 (1MRS750889-
MCD).
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The REF 54_ feeder terminal is provided with an extensive self-supervision system.
The self-supervision system handles run-time fault situations and informs the user
of faults via the HMI and LON/SPA communication. See also Table 4.2.1-12 on
page 78.
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The self-supervision signal output operates on the closed circuit principle. Under
normal conditions the output relay is energized and the contact gap 3-5 is closed.
Should the auxiliary power supply fail or an internal fault be detected, the contact
gap 3-5 is opened.
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When a fault has been detected, the green Ready indicator starts blinking, a fault
indication text is displayed on the HMI and an event 0/E57 is generated. The fault
indication text on the HMI consists of two rows: a general message 'internal fault',
followed by the generated IRF code of the fault as shown below
Fault indication has the highest priority on the HMI and can not be overrun by any
other HMI indication. The fault indication text is displayed until cleared by pressing
the C button for 2 seconds. Then the green READY indicator still remains blinking.
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When entering IRF state the relay will take the following actions to ensure that a
false trip can not be caused by the fault:
1. Applies only to the feeder terminal revisions of the Release 2.5 or later.
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