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5 5 . . 5 5 . . 1 1 . . 4 4 A A l l a a r r m m 1 1 H H y y s s t t e e r r e e s s i i s s
Here hysteresis means: The difference in
thresholds between switching on and
switching off. This difference should be
selected large enough to avoid undesired
switching actions at the output due to the
variations of the current instantaneous
F F o o r r p p o o s s i i t t i i v v e e a a l l a a r r m m v v a a l l u u e e : :
Switching on hysteresis
Current
value
Switching on value = alarm + switching on hysteresis ∆a
Switching off value = alarm – switching off hysteresis ∆b
The switching on value m m u u s s t t b b e e g g r r e e a a t t e e r r than the switching off value.
F F o o r r n n e e g g a a t t i i v v e e a a l l a a r r m m v v a a l l u u e e : :
Current
value
Switching on
hysteresis
Switching on value = alarm – switching on hysteresis ∆a
Switching off value = alarm + switching off hysteresis ∆b
The switching on absolute value (numerical value without sign)
m m u u s s t t b b e e g g r r e e a a t t e e r r than the absolute value for switching off.
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value.
N N o o t t e e : :
Alarm value and hysteresis are always
based on the displayed current value and
not on the input signal value.
Switching off hysteresis
Positive
alarm
Output
Negative
alarm
Switching off
hysteresis
Output
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