hager hw+ - Page 113

1136LE008146B
Alarm management
7.5 Optional alarms
Activation by negative crossing
In the case of a negative crossing of a threshold, activation of the alarm is dependent on the
activation threshold being negatively crossed.
ON
t
S1
T1
T2
S2
Alarm function
ON
OFF
Upper crossing
Symbol Meaning
s1 Activation threshold
s2 Deactivation threshold
T1 Activation time delay
T2 Deactivation time delay
Activation due to equal levels
For the equal value condition, the alarm is activated when the value measured is the same as
the activation value. The activation threshold is the same as the activation value.
T1
T2
ON
Quadrant
t
S2
S1
Alarm function
ON
OFF
Upper crossing