ABB REF 54 Series Operator's Manual page 31

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Operator's Manual
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Normal operation
• No function has started
A protection function is activated and the display
shows the reason for starting.
The Start LED indicator can be selected to be
latching or non-latching.
Should several protection functions start within a
short time, the last start is indicated on the display.
The LED indicator goes on blinking as long as a
protection function of the terminal is blocked.
• The Block indicator is non-latching i.e. it
disappears when the blocking is removed or
when the protection function in question is no
longer started
• Should the function still be started when the
blocking signal is eliminated, the Start LED
indicator will be activated
A message telling which function has been blocked
appears on the display.
• If several protection functions are blocked at the
same time, the most recent blocking is indicated
on the display
• If a protection function is blocked while other
protection functions are started, the LED indicator
remains blinking (BLOCK has higher priority than
START)
Normal operation
• No function has tripped
A protection function has tripped.
The trip indicator is latching, i.e. it must be reset by
pressing [C] (or via serial communication).
If several protection stages/functions trip in a short
time, the first tripping remains on the display.
If the tripping is due to CBFP (circuit breaker failure
protection), the red LED indicator is blinking.
The trip (CBFP) indicator is latching.
The indicator is reset by pressing the C button for 2
seconds.
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