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Section 11
1MAC050144-MB C
General function block features
630
615 series ANSI
Technical Manual
Figure 335:
Drop-off period is longer than the set
Reset delay time
When the drop-off period is longer than the set
Reset delay time
, as described in Figure
335, the input signal for the definite timer (here: timer input) is active, provided that the
current is above the set
Pickup value
. The input signal is inactive when the current is below
the set
Pickup value
and the set hysteresis region. The timer input rises when a fault current
is detected. The definite timer activates the
PICKUP
output and the trip timer starts
elapsing. The reset (drop-off) timer starts when the timer input falls, that is, the fault
disappears. When the reset (drop-off) timer elapses, the trip timer is reset. Since this
happens before another pickup occurs, the
TRIP
output is not activated.
Содержание 615 Series ANSI
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