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6LE005550A
Function of the Energy trip unit
3.4 Managing alarms and logs
Symbol
Meaning
S1
Activation threshold
S2
Deactivation threshold
T1
Activation time delay
T2
Deactivation time delay
3.4.5
System alarms
There are three system alarms:
- Internal trip unit error
- Trip unit temperature alarm
- Rupture of the neutral pole
They correspond to predefined events:
Internal trip unit error
The Energy trip unit constantly monitors its protection function. In the case of an
operating fault concerning the electronics of the trip unit, the
Internal trip unit error
alarm is activated and the circuit breaker status LED flashes orange.
Trip unit temperature alarm
The Energy trip unit constantly monitors its internal temperature.
When the temperature exceeds 105 °C, the
trip unit temperature
alarm is activated
and a pop-up appears on the embedded display and the panel display. The alarm
remains active whilst the internal temperature of the trip unit remains above the
threshold of 100 °C.
Rupture of the neutral pole
Only available on Energy 4P versions.
This alarm is activated if a ruptured neutral pole is detected on an Energy 4P
circuit breaker and if this alarm has been assigned to the OAC output contact. A
ruptured neutral pole produces an increased voltage potential between the phase
poles and the neutral pole. This detection is based on monitoring an overvoltage
of approximately 275 VAC, a trip threshold and a time delay. These parameters are
defined from standard EN50550 for a rated voltage between phase and neutral of
230 V.
These alarms are identified by LEDs or pop-ups depending on the trip unit version
and display used:
LSIG
LSI
LSnl
Energy
Panel
display
Internal trip unit
error
Flashing orange notification
Notification
"Circuit breaker error"
Trip unit
temperature
alarm
Notification
Notification
"T °C exceeded"
(only LSI LSIG)
Rupture of the
neutral pole
-
Notification
"Ruptured N pole"
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