60 6LE005550A
Function of the Energy trip unit
3.4 Managing alarms and logs
3.4.1
Principle of Energy
trip unit alarms
The Energy trip unit is used to manage four types of alarms:
- PTA overload pre-alarm
- Trip alarm
- Customisable alarm
- System alarm
The PTA overload pre-alarm provides a warning about the imminent trip risk due to
a current overload. It is associated with the PTA output contact.
The trip alarms provide warning about trip events and guide diagnostics towards
the cause of the trip.
The customisable alarms are used to monitor and be alerted to the measurements
taken by the Energy trip unit.
The system alarms correspond to predefined events.
In addition to these alarms, the OAC output contact alarm enables one of the
following alarms to be reported: PTA overload pre-alarm, customisable alarms,
system alarms.
Priority level of customisable and trip alarms
Each trip alarm and each customisable alarm is associated with a priority level:
- High priority
- Medium priority
- Low priority
- No priority
The trip alarms and customisable alarms created are always in operation, even if no
priority has been assigned.
The overload pre-alarm, the system alarms and the OAC output contact alarm are
always in operation and have the high priority level.
Signalling of alarms on the Energy trip unit
PTA LED Pop-up
PTA overload pre-alarm
X –
Trip alarm
– X
System alarm
– X
OAC output alarm
– X
Note
The customisable alarms are not reported on the Energy trip unit. The "Internal trip
unit error" system alarm is identified by the "Ready" LED which flashes orange
(see 3.4.5 below).
Signalling of alarms on the panel display
Stored in the log
Stored in the list
of active alarms
Pop-up Alarm LED
Priority level
low
X – – –
medium
X X – X
high
X X X X
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