Figure 984: Drop-off period is shorter than the set Reset delay time
When the drop-off period is shorter than the set
Reset delay time
, as described
in
Figure 984
, the input signal for the definite timer (here: timer input) is active,
provided that the current is above the set
Start value
. The input signal is inactive
when the current is below the set
Start value
and the set hysteresis region. The
timer input rises when a fault current is detected. The definite timer activates
the START output and the operate timer starts elapsing. The Reset (drop-off)
timer starts when the timer input falls, that is, the fault disappears. Another fault
situation occurs before the reset (drop-off) timer has elapsed. This causes the
activation of the OPERATE output, since the operate timer already has elapsed.
1MRS759142 F
General function block features
REX640
Technical Manual
1861
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