ABB REC650 ANSI Technical Manual page 541

1MRK 511 287-UUS A
12.18.7.6
Technical manual
be reset by setting the Clear accum. breaking curr setting to on in the clear menu from
LHMI.
Alarm limit check
The IACCALM alarm is activated when the accumulated energy exceeds the value set with
the AccCurrAlmLvl threshold setting. However, when the energy exceeds the limit value
set with the AccCurrLO threshold setting, the IACCLOAL output is activated.
The IACCALM and IACCLOAL outputs can be blocked by activating the binary input
BLOCK.
Remaining life of the circuit breaker
Every time the breaker operates, the life of the circuit breaker reduces due to wear off. The
breaker wear off depends on the tripping current. The remaining life of the breaker is
estimated from the circuit breaker trip curve provided by the manufacturer. The remaining
life is decremented at least by one when the circuit breaker is opened. The operation of the
remaining life of the circuit breaker subfunction can be described by using a module
diagram. All the modules in the diagram are explained in the next sections.
I_A
I_B
I3P
I_C
POSCLOSE
CBCNTRST
BLOCK
BLK_ALM
GUID-1565CD41-3ABF-4DE7-AF68-51623380DF29-ANSI V1 EN
Figure 238: Functional module diagram for estimating the life of the circuit breaker
Circuit breaker life estimator
The circuit breaker life estimator module calculates the remaining life of the circuit
breaker. If the tripping current is less than the rated operating current set with the
RatedOpCurr setting, the remaining operation of the breaker reduces by one operation. If
the tripping current is more than the rated fault current set with the RatedFaultCurr
setting, then remaining operations of the circuit breaker are reduced by the OperNoRated/
OperNoFault value. The remaining life due to the tripping current in between these two
values is calculated based on the trip curve given by the manufacturer. The
OpNumRatCurr and OPNumFaultCurr parameters set the number of operations the
breaker can perform at the rated current and at the rated fault current, respectively.
CB life Alarm limit
estimator check
Section 12
Monitoring
CBLIFEAL
535