ABB REF 54 Series - Page 31

1MRS 750500-MUM
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Operator’s Manual
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31
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Normal operation
• No function has started
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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.
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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)
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Normal operation
• No function has tripped
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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.
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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.