hager h3+ - PTA Overload Pre-Alarm

616LE005550A
Function of the Energy trip unit
3.4 Managing alarms and logs
3.4.2
PTA overload pre-alarm
The PTA overload pre-alarm is defined by two parameters:
-
PTA threshold: Threshold expressed as a % Ir (can be adjusted from 60 to 95%)
-
PTA time delay: Expressed as a % tr (can be adjusted from 5 to 80%)
It is activated for a load current when the intensity and duration falls in a
pre-trip
warning zone
.
t
tr
tsd
6xIr Ii ou Isd I
Charge normale
Surveillance avant alerte
Alerte avant déclenchement
50% tr
90% Ir
PTA
50% tr
90% Ir
Overload pre-alarm zones
This
pre-trip warning zone
is delimited on the one hand by the threshold and time
delay of the PTA overload pre-alarm and, on the other hand, by the Ir threshold and
tsd time delay.
The
pre-warning monitoring zone
starts from the PTA threshold. Any load current
which appears in the monitoring zone is taken into account in the form of a thermal
image of current and increases as the load of the Energy trip unit increases.
When the monitoring zone is entered and the PTA overload pre-alarm is active, the
PTA LED for the trip unit is activated.
Activation of the overload pre-alarm also results in the PTA output contact closing.
Normal load zone
Pre-warning
monitoring zone
Pre-trip warning
zone
o
Flashing orange
Permanent orange
PTA contact
open
open
closed
Note
This pre-alarm and the behaviour described above are also the same for LSI and
LSIG circuit breakers. The LED corresponding to these circuit breakers is 90% Ir.
Normal load
Pre-warning monitoring
Pre-trip warning