114 6LE008146B
Alarm management
7.5 Optional alarms
Symbol Meaning
s1 Activation value
T1 Activation time delay
T2 Deactivation time delay
Managing time delays
The time delays of optional alarms are managed by 2 counters which are normally at 0
For the activation time delay, the counter:
- Is increased when the activation condition is met,
- Is decreased if the activation condition is not met and if the time delay T1 is not reached,
- Is reset when the time delay is reached.
For the deactivation time delay, the counter:
- Is increased when the deactivation condition is met,
- Is decreased if the deactivation condition is no longer met and if the time delay T2 is not
reached,
- Is reset when the time delay is reached.
When the activation time delay is reached, the alarm is activated.
When an alarm is reconfigured, the counters are also reset.
Example:
In this example, the alarm is set to a positive crossing of the activation threshold of 280
V when measuring the voltage V1N. The activation time delay is set at 4 seconds. The
deactivation threshold is set at 250 V and the deactivation time delay at 2 seconds.
S1: 280 V
S2: 250 V
T1: 4 s
T1 = 4 s
T2 = 2 s
T2: 2 s
t
t
t
ONOFF OFF
Custom alarms: time delays
Symbol Meaning
s1 Activation threshold
s2 Deactivation threshold
T1 Activation time delay
T2 Deactivation time delay
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