1.Fault Indication; 2.Fault Operation - ABB REF 54 Series Technical Reference Manual, General

REF 54_
5.1.12.1.
5.1.12.2.
66
Feeder Terminal
Technical Reference Manual, General
Fault indication
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.
Normal condition
IRF
Fig. 5.1.12.1.-1 Self-supervision output (IRF)
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.
Fault operation
When entering IRF state the relay will take the following actions to ensure that a
false trip can not be caused by the fault:
• All relay outputs will be forced to zero (released), and subsequent changes
blocked.
• All virtual outputs (COMM_OUT1...32) will be written to zero, and subsequent
changes blocked.
• The analog outputs will freeze at the current value.
• Event transmission will be blocked, except for IRF events E56/E57 and startup
event E50.
1. Applies only to the feeder terminal revisions of Release 2.5 or later.
Fault condition
3
4
IRF
5
1MRS750527-MUM
3
4
5
IRFoutput_b
1
:
irf