hager hw+ User Manual

1076LE008146B
Alarm management
7.2 PTA overloadprealarms
The PTA overload prealarms provide a warning when the situation is close to overload
after a load current greater than the PTA threshold. Preventive measures (load-shedding,
maintenance, etc.) can then be taken before the circuit breaker trips, avoiding a
powerblackout.
The sentinel Energy trip unit oers the possibility of generating 2 overload prealarms PTA 1
and PTA 2. Only the PTA 1 prealarm is shown in the form of a message window or notification
icon on the sentinel Energy display and panel display.
But the 2 prealarms PTA 1 and PTA 2 appear in the lists of active alarms and are recorded in
the events history. They are also available on the Modbus communication.
Adjustment parameters
PTA 1
Threshold Ir
PTA tripping threshold of the overload prealarm
Delay tr
PTA overload prealarm time delay
PTA 2
Activation
Activation of the PTA 2 overload prealarm
Threshold Ir
PTA tripping threshold of the overload prealarm
Delay tr
PTA overload prealarm time delay
The PTA prealarms are adjusted from the ALARMS
PREALARMS menu of the sentinel
Energy display, the HTD210H panel display or the Hager Power setup software.
PTA threshold adjustment range (in%Ir)
From 60 to 95% in increments of 5.
Time delay PTA adjustment range (in %tr)
From 5 to 80% in increments of 5.
The PTA prealarm is deactivated by default.
The overload prealarms trip for any current (gradual rise or current peak) reaching the
surveillance zone
.
t
tr
tsd
6xIr I
50% tr
90% Ir
PTA
50% tr
90% Ir
Overload prealarm zones

hager hw+ Specifications

General

Brand	hager
Model	hw+
Category	Circuit breakers
Language	English